krnl386.exe16: Don't overflow when calculating size.

[wine.git] / libs / xml2 / parser.c

/*
 * parser.c : an XML 1.0 parser, namespaces and validity support are mostly
 *            implemented on top of the SAX interfaces
 *
 * References:
 *   The XML specification:
 *     http://www.w3.org/TR/REC-xml
 *   Original 1.0 version:
 *     http://www.w3.org/TR/1998/REC-xml-19980210
 *   XML second edition working draft
 *     http://www.w3.org/TR/2000/WD-xml-2e-20000814
 *
 * Okay this is a big file, the parser core is around 7000 lines, then it
 * is followed by the progressive parser top routines, then the various
 * high level APIs to call the parser and a few miscellaneous functions.
 * A number of helper functions and deprecated ones have been moved to
 * parserInternals.c to reduce this file size.
 * As much as possible the functions are associated with their relative
 * production in the XML specification. A few productions defining the
 * different ranges of character are actually implanted either in
 * parserInternals.h or parserInternals.c
 * The DOM tree build is realized from the default SAX callbacks in
 * the module SAX.c.
 * The routines doing the validation checks are in valid.c and called either
 * from the SAX callbacks or as standalone functions using a preparsed
 * document.
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */

/* To avoid EBCDIC trouble when parsing on zOS */
#if defined(__MVS__)
#pragma convert("ISO8859-1")
#endif

#define IN_LIBXML
#include "libxml.h"

#if defined(_WIN32)
#define XML_DIR_SEP '\\'
#else
#define XML_DIR_SEP '/'
#endif

#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <stdarg.h>
#include <stddef.h>
#include <ctype.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/threads.h>
#include <libxml/globals.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/valid.h>
#include <libxml/entities.h>
#include <libxml/xmlerror.h>
#include <libxml/encoding.h>
#include <libxml/xmlIO.h>
#include <libxml/uri.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#ifdef LIBXML_SCHEMAS_ENABLED
#include <libxml/xmlschemastypes.h>
#include <libxml/relaxng.h>
#endif

#include "buf.h"
#include "enc.h"

struct _xmlStartTag {
    const xmlChar *prefix;
    const xmlChar *URI;
    int line;
    int nsNr;
};

static void
xmlFatalErr(xmlParserCtxtPtr ctxt, xmlParserErrors error, const char *info);

static xmlParserCtxtPtr
xmlCreateEntityParserCtxtInternal(const xmlChar *URL, const xmlChar *ID,
                          const xmlChar *base, xmlParserCtxtPtr pctx);

static void xmlHaltParser(xmlParserCtxtPtr ctxt);

static int
xmlParseElementStart(xmlParserCtxtPtr ctxt);

static void
xmlParseElementEnd(xmlParserCtxtPtr ctxt);

/************************************************************************
 *                                                                      *
 *      Arbitrary limits set in the parser. See XML_PARSE_HUGE          *
 *                                                                      *
 ************************************************************************/

#define XML_MAX_HUGE_LENGTH 1000000000

#define XML_PARSER_BIG_ENTITY 1000
#define XML_PARSER_LOT_ENTITY 5000

/*
 * XML_PARSER_NON_LINEAR is the threshold where the ratio of parsed entity
 *    replacement over the size in byte of the input indicates that you have
 *    and exponential behaviour. A value of 10 correspond to at least 3 entity
 *    replacement per byte of input.
 */
#define XML_PARSER_NON_LINEAR 10

/*
 * xmlParserEntityCheck
 *
 * Function to check non-linear entity expansion behaviour
 * This is here to detect and stop exponential linear entity expansion
 * This is not a limitation of the parser but a safety
 * boundary feature. It can be disabled with the XML_PARSE_HUGE
 * parser option.
 */
static int
xmlParserEntityCheck(xmlParserCtxtPtr ctxt, size_t size,
                     xmlEntityPtr ent, size_t replacement)
{
    size_t consumed = 0;
    int i;

    if ((ctxt == NULL) || (ctxt->options & XML_PARSE_HUGE))
        return (0);
    if (ctxt->lastError.code == XML_ERR_ENTITY_LOOP)
        return (1);

    /*
     * This may look absurd but is needed to detect
     * entities problems
     */
    if ((ent != NULL) && (ent->etype != XML_INTERNAL_PREDEFINED_ENTITY) &&
        (ent->content != NULL) && (ent->checked == 0) &&
        (ctxt->errNo != XML_ERR_ENTITY_LOOP)) {
        unsigned long oldnbent = ctxt->nbentities, diff;
        xmlChar *rep;

        ent->checked = 1;

        ++ctxt->depth;
        rep = xmlStringDecodeEntities(ctxt, ent->content,
                                  XML_SUBSTITUTE_REF, 0, 0, 0);
        --ctxt->depth;
        if ((rep == NULL) || (ctxt->errNo == XML_ERR_ENTITY_LOOP)) {
            ent->content[0] = 0;
        }

        diff = ctxt->nbentities - oldnbent + 1;
        if (diff > INT_MAX / 2)
            diff = INT_MAX / 2;
        ent->checked = diff * 2;
        if (rep != NULL) {
            if (xmlStrchr(rep, '<'))
                ent->checked |= 1;
            xmlFree(rep);
            rep = NULL;
        }
    }

    /*
     * Prevent entity exponential check, not just replacement while
     * parsing the DTD
     * The check is potentially costly so do that only once in a thousand
     */
    if ((ctxt->instate == XML_PARSER_DTD) && (ctxt->nbentities > 10000) &&
        (ctxt->nbentities % 1024 == 0)) {
        for (i = 0;i < ctxt->inputNr;i++) {
            consumed += ctxt->inputTab[i]->consumed +
                       (ctxt->inputTab[i]->cur - ctxt->inputTab[i]->base);
        }
        if (ctxt->nbentities > consumed * XML_PARSER_NON_LINEAR) {
            xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
            ctxt->instate = XML_PARSER_EOF;
            return (1);
        }
        consumed = 0;
    }



    if (replacement != 0) {
        if (replacement < XML_MAX_TEXT_LENGTH)
            return(0);

        /*
         * If the volume of entity copy reaches 10 times the
         * amount of parsed data and over the large text threshold
         * then that's very likely to be an abuse.
         */
        if (ctxt->input != NULL) {
            consumed = ctxt->input->consumed +
                       (ctxt->input->cur - ctxt->input->base);
        }
        consumed += ctxt->sizeentities;

        if (replacement < XML_PARSER_NON_LINEAR * consumed)
            return(0);
    } else if (size != 0) {
        /*
         * Do the check based on the replacement size of the entity
         */
        if (size < XML_PARSER_BIG_ENTITY)
            return(0);

        /*
         * A limit on the amount of text data reasonably used
         */
        if (ctxt->input != NULL) {
            consumed = ctxt->input->consumed +
                (ctxt->input->cur - ctxt->input->base);
        }
        consumed += ctxt->sizeentities;

        if ((size < XML_PARSER_NON_LINEAR * consumed) &&
            (ctxt->nbentities * 3 < XML_PARSER_NON_LINEAR * consumed))
            return (0);
    } else if (ent != NULL) {
        /*
         * use the number of parsed entities in the replacement
         */
        size = ent->checked / 2;

        /*
         * The amount of data parsed counting entities size only once
         */
        if (ctxt->input != NULL) {
            consumed = ctxt->input->consumed +
                (ctxt->input->cur - ctxt->input->base);
        }
        consumed += ctxt->sizeentities;

        /*
         * Check the density of entities for the amount of data
         * knowing an entity reference will take at least 3 bytes
         */
        if (size * 3 < consumed * XML_PARSER_NON_LINEAR)
            return (0);
    } else {
        /*
         * strange we got no data for checking
         */
        if (((ctxt->lastError.code != XML_ERR_UNDECLARED_ENTITY) &&
             (ctxt->lastError.code != XML_WAR_UNDECLARED_ENTITY)) ||
            (ctxt->nbentities <= 10000))
            return (0);
    }
    xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
    return (1);
}

/**
 * xmlParserMaxDepth:
 *
 * arbitrary depth limit for the XML documents that we allow to
 * process. This is not a limitation of the parser but a safety
 * boundary feature. It can be disabled with the XML_PARSE_HUGE
 * parser option.
 */
unsigned int xmlParserMaxDepth = 256;



#define SAX2 1
#define XML_PARSER_BIG_BUFFER_SIZE 300
#define XML_PARSER_BUFFER_SIZE 100
#define SAX_COMPAT_MODE BAD_CAST "SAX compatibility mode document"

/**
 * XML_PARSER_CHUNK_SIZE
 *
 * When calling GROW that's the minimal amount of data
 * the parser expected to have received. It is not a hard
 * limit but an optimization when reading strings like Names
 * It is not strictly needed as long as inputs available characters
 * are followed by 0, which should be provided by the I/O level
 */
#define XML_PARSER_CHUNK_SIZE 100

/*
 * List of XML prefixed PI allowed by W3C specs
 */

static const char* const xmlW3CPIs[] = {
    "xml-stylesheet",
    "xml-model",
    NULL
};


/* DEPR void xmlParserHandleReference(xmlParserCtxtPtr ctxt); */
static xmlEntityPtr xmlParseStringPEReference(xmlParserCtxtPtr ctxt,
                                              const xmlChar **str);

static xmlParserErrors
xmlParseExternalEntityPrivate(xmlDocPtr doc, xmlParserCtxtPtr oldctxt,
                      xmlSAXHandlerPtr sax,
                      void *user_data, int depth, const xmlChar *URL,
                      const xmlChar *ID, xmlNodePtr *list);

static int
xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options,
                          const char *encoding);
#ifdef LIBXML_LEGACY_ENABLED
static void
xmlAddEntityReference(xmlEntityPtr ent, xmlNodePtr firstNode,
                      xmlNodePtr lastNode);
#endif /* LIBXML_LEGACY_ENABLED */

static xmlParserErrors
xmlParseBalancedChunkMemoryInternal(xmlParserCtxtPtr oldctxt,
                      const xmlChar *string, void *user_data, xmlNodePtr *lst);

static int
xmlLoadEntityContent(xmlParserCtxtPtr ctxt, xmlEntityPtr entity);

/************************************************************************
 *                                                                      *
 *              Some factorized error routines                          *
 *                                                                      *
 ************************************************************************/

/**
 * xmlErrAttributeDup:
 * @ctxt:  an XML parser context
 * @prefix:  the attribute prefix
 * @localname:  the attribute localname
 *
 * Handle a redefinition of attribute error
 */
static void
xmlErrAttributeDup(xmlParserCtxtPtr ctxt, const xmlChar * prefix,
                   const xmlChar * localname)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = XML_ERR_ATTRIBUTE_REDEFINED;

    if (prefix == NULL)
        __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER,
                        XML_ERR_ATTRIBUTE_REDEFINED, XML_ERR_FATAL, NULL, 0,
                        (const char *) localname, NULL, NULL, 0, 0,
                        "Attribute %s redefined\n", localname);
    else
        __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER,
                        XML_ERR_ATTRIBUTE_REDEFINED, XML_ERR_FATAL, NULL, 0,
                        (const char *) prefix, (const char *) localname,
                        NULL, 0, 0, "Attribute %s:%s redefined\n", prefix,
                        localname);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}

/**
 * xmlFatalErr:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @extra:  extra information string
 *
 * Handle a fatal parser error, i.e. violating Well-Formedness constraints
 */
static void
xmlFatalErr(xmlParserCtxtPtr ctxt, xmlParserErrors error, const char *info)
{
    const char *errmsg;

    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    switch (error) {
        case XML_ERR_INVALID_HEX_CHARREF:
            errmsg = "CharRef: invalid hexadecimal value";
            break;
        case XML_ERR_INVALID_DEC_CHARREF:
            errmsg = "CharRef: invalid decimal value";
            break;
        case XML_ERR_INVALID_CHARREF:
            errmsg = "CharRef: invalid value";
            break;
        case XML_ERR_INTERNAL_ERROR:
            errmsg = "internal error";
            break;
        case XML_ERR_PEREF_AT_EOF:
            errmsg = "PEReference at end of document";
            break;
        case XML_ERR_PEREF_IN_PROLOG:
            errmsg = "PEReference in prolog";
            break;
        case XML_ERR_PEREF_IN_EPILOG:
            errmsg = "PEReference in epilog";
            break;
        case XML_ERR_PEREF_NO_NAME:
            errmsg = "PEReference: no name";
            break;
        case XML_ERR_PEREF_SEMICOL_MISSING:
            errmsg = "PEReference: expecting ';'";
            break;
        case XML_ERR_ENTITY_LOOP:
            errmsg = "Detected an entity reference loop";
            break;
        case XML_ERR_ENTITY_NOT_STARTED:
            errmsg = "EntityValue: \" or ' expected";
            break;
        case XML_ERR_ENTITY_PE_INTERNAL:
            errmsg = "PEReferences forbidden in internal subset";
            break;
        case XML_ERR_ENTITY_NOT_FINISHED:
            errmsg = "EntityValue: \" or ' expected";
            break;
        case XML_ERR_ATTRIBUTE_NOT_STARTED:
            errmsg = "AttValue: \" or ' expected";
            break;
        case XML_ERR_LT_IN_ATTRIBUTE:
            errmsg = "Unescaped '<' not allowed in attributes values";
            break;
        case XML_ERR_LITERAL_NOT_STARTED:
            errmsg = "SystemLiteral \" or ' expected";
            break;
        case XML_ERR_LITERAL_NOT_FINISHED:
            errmsg = "Unfinished System or Public ID \" or ' expected";
            break;
        case XML_ERR_MISPLACED_CDATA_END:
            errmsg = "Sequence ']]>' not allowed in content";
            break;
        case XML_ERR_URI_REQUIRED:
            errmsg = "SYSTEM or PUBLIC, the URI is missing";
            break;
        case XML_ERR_PUBID_REQUIRED:
            errmsg = "PUBLIC, the Public Identifier is missing";
            break;
        case XML_ERR_HYPHEN_IN_COMMENT:
            errmsg = "Comment must not contain '--' (double-hyphen)";
            break;
        case XML_ERR_PI_NOT_STARTED:
            errmsg = "xmlParsePI : no target name";
            break;
        case XML_ERR_RESERVED_XML_NAME:
            errmsg = "Invalid PI name";
            break;
        case XML_ERR_NOTATION_NOT_STARTED:
            errmsg = "NOTATION: Name expected here";
            break;
        case XML_ERR_NOTATION_NOT_FINISHED:
            errmsg = "'>' required to close NOTATION declaration";
            break;
        case XML_ERR_VALUE_REQUIRED:
            errmsg = "Entity value required";
            break;
        case XML_ERR_URI_FRAGMENT:
            errmsg = "Fragment not allowed";
            break;
        case XML_ERR_ATTLIST_NOT_STARTED:
            errmsg = "'(' required to start ATTLIST enumeration";
            break;
        case XML_ERR_NMTOKEN_REQUIRED:
            errmsg = "NmToken expected in ATTLIST enumeration";
            break;
        case XML_ERR_ATTLIST_NOT_FINISHED:
            errmsg = "')' required to finish ATTLIST enumeration";
            break;
        case XML_ERR_MIXED_NOT_STARTED:
            errmsg = "MixedContentDecl : '|' or ')*' expected";
            break;
        case XML_ERR_PCDATA_REQUIRED:
            errmsg = "MixedContentDecl : '#PCDATA' expected";
            break;
        case XML_ERR_ELEMCONTENT_NOT_STARTED:
            errmsg = "ContentDecl : Name or '(' expected";
            break;
        case XML_ERR_ELEMCONTENT_NOT_FINISHED:
            errmsg = "ContentDecl : ',' '|' or ')' expected";
            break;
        case XML_ERR_PEREF_IN_INT_SUBSET:
            errmsg =
                "PEReference: forbidden within markup decl in internal subset";
            break;
        case XML_ERR_GT_REQUIRED:
            errmsg = "expected '>'";
            break;
        case XML_ERR_CONDSEC_INVALID:
            errmsg = "XML conditional section '[' expected";
            break;
        case XML_ERR_EXT_SUBSET_NOT_FINISHED:
            errmsg = "Content error in the external subset";
            break;
        case XML_ERR_CONDSEC_INVALID_KEYWORD:
            errmsg =
                "conditional section INCLUDE or IGNORE keyword expected";
            break;
        case XML_ERR_CONDSEC_NOT_FINISHED:
            errmsg = "XML conditional section not closed";
            break;
        case XML_ERR_XMLDECL_NOT_STARTED:
            errmsg = "Text declaration '<?xml' required";
            break;
        case XML_ERR_XMLDECL_NOT_FINISHED:
            errmsg = "parsing XML declaration: '?>' expected";
            break;
        case XML_ERR_EXT_ENTITY_STANDALONE:
            errmsg = "external parsed entities cannot be standalone";
            break;
        case XML_ERR_ENTITYREF_SEMICOL_MISSING:
            errmsg = "EntityRef: expecting ';'";
            break;
        case XML_ERR_DOCTYPE_NOT_FINISHED:
            errmsg = "DOCTYPE improperly terminated";
            break;
        case XML_ERR_LTSLASH_REQUIRED:
            errmsg = "EndTag: '</' not found";
            break;
        case XML_ERR_EQUAL_REQUIRED:
            errmsg = "expected '='";
            break;
        case XML_ERR_STRING_NOT_CLOSED:
            errmsg = "String not closed expecting \" or '";
            break;
        case XML_ERR_STRING_NOT_STARTED:
            errmsg = "String not started expecting ' or \"";
            break;
        case XML_ERR_ENCODING_NAME:
            errmsg = "Invalid XML encoding name";
            break;
        case XML_ERR_STANDALONE_VALUE:
            errmsg = "standalone accepts only 'yes' or 'no'";
            break;
        case XML_ERR_DOCUMENT_EMPTY:
            errmsg = "Document is empty";
            break;
        case XML_ERR_DOCUMENT_END:
            errmsg = "Extra content at the end of the document";
            break;
        case XML_ERR_NOT_WELL_BALANCED:
            errmsg = "chunk is not well balanced";
            break;
        case XML_ERR_EXTRA_CONTENT:
            errmsg = "extra content at the end of well balanced chunk";
            break;
        case XML_ERR_VERSION_MISSING:
            errmsg = "Malformed declaration expecting version";
            break;
        case XML_ERR_NAME_TOO_LONG:
            errmsg = "Name too long";
            break;
#if 0
        case:
            errmsg = "";
            break;
#endif
        default:
            errmsg = "Unregistered error message";
    }
    if (ctxt != NULL)
        ctxt->errNo = error;
    if (info == NULL) {
        __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER, error,
                        XML_ERR_FATAL, NULL, 0, info, NULL, NULL, 0, 0, "%s\n",
                        errmsg);
    } else {
        __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER, error,
                        XML_ERR_FATAL, NULL, 0, info, NULL, NULL, 0, 0, "%s: %s\n",
                        errmsg, info);
    }
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}

/**
 * xmlFatalErrMsg:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 *
 * Handle a fatal parser error, i.e. violating Well-Formedness constraints
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsg(xmlParserCtxtPtr ctxt, xmlParserErrors error,
               const char *msg)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER, error,
                    XML_ERR_FATAL, NULL, 0, NULL, NULL, NULL, 0, 0, "%s", msg);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}

/**
 * xmlWarningMsg:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 * @str1:  extra data
 * @str2:  extra data
 *
 * Handle a warning.
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlWarningMsg(xmlParserCtxtPtr ctxt, xmlParserErrors error,
              const char *msg, const xmlChar *str1, const xmlChar *str2)
{
    xmlStructuredErrorFunc schannel = NULL;

    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if ((ctxt != NULL) && (ctxt->sax != NULL) &&
        (ctxt->sax->initialized == XML_SAX2_MAGIC))
        schannel = ctxt->sax->serror;
    if (ctxt != NULL) {
        __xmlRaiseError(schannel,
                    (ctxt->sax) ? ctxt->sax->warning : NULL,
                    ctxt->userData,
                    ctxt, NULL, XML_FROM_PARSER, error,
                    XML_ERR_WARNING, NULL, 0,
                    (const char *) str1, (const char *) str2, NULL, 0, 0,
                    msg, (const char *) str1, (const char *) str2);
    } else {
        __xmlRaiseError(schannel, NULL, NULL,
                    ctxt, NULL, XML_FROM_PARSER, error,
                    XML_ERR_WARNING, NULL, 0,
                    (const char *) str1, (const char *) str2, NULL, 0, 0,
                    msg, (const char *) str1, (const char *) str2);
    }
}

/**
 * xmlValidityError:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 * @str1:  extra data
 *
 * Handle a validity error.
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlValidityError(xmlParserCtxtPtr ctxt, xmlParserErrors error,
              const char *msg, const xmlChar *str1, const xmlChar *str2)
{
    xmlStructuredErrorFunc schannel = NULL;

    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL) {
        ctxt->errNo = error;
        if ((ctxt->sax != NULL) && (ctxt->sax->initialized == XML_SAX2_MAGIC))
            schannel = ctxt->sax->serror;
    }
    if (ctxt != NULL) {
        __xmlRaiseError(schannel,
                    ctxt->vctxt.error, ctxt->vctxt.userData,
                    ctxt, NULL, XML_FROM_DTD, error,
                    XML_ERR_ERROR, NULL, 0, (const char *) str1,
                    (const char *) str2, NULL, 0, 0,
                    msg, (const char *) str1, (const char *) str2);
        ctxt->valid = 0;
    } else {
        __xmlRaiseError(schannel, NULL, NULL,
                    ctxt, NULL, XML_FROM_DTD, error,
                    XML_ERR_ERROR, NULL, 0, (const char *) str1,
                    (const char *) str2, NULL, 0, 0,
                    msg, (const char *) str1, (const char *) str2);
    }
}

/**
 * xmlFatalErrMsgInt:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 * @val:  an integer value
 *
 * Handle a fatal parser error, i.e. violating Well-Formedness constraints
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsgInt(xmlParserCtxtPtr ctxt, xmlParserErrors error,
                  const char *msg, int val)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL,
                    ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
                    NULL, 0, NULL, NULL, NULL, val, 0, msg, val);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}

/**
 * xmlFatalErrMsgStrIntStr:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 * @str1:  an string info
 * @val:  an integer value
 * @str2:  an string info
 *
 * Handle a fatal parser error, i.e. violating Well-Formedness constraints
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsgStrIntStr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
                  const char *msg, const xmlChar *str1, int val,
                  const xmlChar *str2)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL,
                    ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
                    NULL, 0, (const char *) str1, (const char *) str2,
                    NULL, val, 0, msg, str1, val, str2);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}

/**
 * xmlFatalErrMsgStr:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 * @val:  a string value
 *
 * Handle a fatal parser error, i.e. violating Well-Formedness constraints
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsgStr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
                  const char *msg, const xmlChar * val)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL,
                    XML_FROM_PARSER, error, XML_ERR_FATAL,
                    NULL, 0, (const char *) val, NULL, NULL, 0, 0, msg,
                    val);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}

/**
 * xmlErrMsgStr:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the error message
 * @val:  a string value
 *
 * Handle a non fatal parser error
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlErrMsgStr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
                  const char *msg, const xmlChar * val)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL,
                    XML_FROM_PARSER, error, XML_ERR_ERROR,
                    NULL, 0, (const char *) val, NULL, NULL, 0, 0, msg,
                    val);
}

/**
 * xmlNsErr:
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the message
 * @info1:  extra information string
 * @info2:  extra information string
 *
 * Handle a fatal parser error, i.e. violating Well-Formedness constraints
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlNsErr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
         const char *msg,
         const xmlChar * info1, const xmlChar * info2,
         const xmlChar * info3)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_NAMESPACE, error,
                    XML_ERR_ERROR, NULL, 0, (const char *) info1,
                    (const char *) info2, (const char *) info3, 0, 0, msg,
                    info1, info2, info3);
    if (ctxt != NULL)
        ctxt->nsWellFormed = 0;
}

/**
 * xmlNsWarn
 * @ctxt:  an XML parser context
 * @error:  the error number
 * @msg:  the message
 * @info1:  extra information string
 * @info2:  extra information string
 *
 * Handle a namespace warning error
 */
static void LIBXML_ATTR_FORMAT(3,0)
xmlNsWarn(xmlParserCtxtPtr ctxt, xmlParserErrors error,
         const char *msg,
         const xmlChar * info1, const xmlChar * info2,
         const xmlChar * info3)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
        return;
    __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_NAMESPACE, error,
                    XML_ERR_WARNING, NULL, 0, (const char *) info1,
                    (const char *) info2, (const char *) info3, 0, 0, msg,
                    info1, info2, info3);
}

/************************************************************************
 *                                                                      *
 *              Library wide options                                    *
 *                                                                      *
 ************************************************************************/

/**
  * xmlHasFeature:
  * @feature: the feature to be examined
  *
  * Examines if the library has been compiled with a given feature.
  *
  * Returns a non-zero value if the feature exist, otherwise zero.
  * Returns zero (0) if the feature does not exist or an unknown
  * unknown feature is requested, non-zero otherwise.
  */
int
xmlHasFeature(xmlFeature feature)
{
    switch (feature) {
        case XML_WITH_THREAD:
#ifdef LIBXML_THREAD_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_TREE:
#ifdef LIBXML_TREE_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_OUTPUT:
#ifdef LIBXML_OUTPUT_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_PUSH:
#ifdef LIBXML_PUSH_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_READER:
#ifdef LIBXML_READER_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_PATTERN:
#ifdef LIBXML_PATTERN_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_WRITER:
#ifdef LIBXML_WRITER_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_SAX1:
#ifdef LIBXML_SAX1_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_FTP:
#ifdef LIBXML_FTP_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_HTTP:
#ifdef LIBXML_HTTP_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_VALID:
#ifdef LIBXML_VALID_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_HTML:
#ifdef LIBXML_HTML_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_LEGACY:
#ifdef LIBXML_LEGACY_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_C14N:
#ifdef LIBXML_C14N_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_CATALOG:
#ifdef LIBXML_CATALOG_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_XPATH:
#ifdef LIBXML_XPATH_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_XPTR:
#ifdef LIBXML_XPTR_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_XINCLUDE:
#ifdef LIBXML_XINCLUDE_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_ICONV:
#ifdef LIBXML_ICONV_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_ISO8859X:
#ifdef LIBXML_ISO8859X_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_UNICODE:
#ifdef LIBXML_UNICODE_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_REGEXP:
#ifdef LIBXML_REGEXP_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_AUTOMATA:
#ifdef LIBXML_AUTOMATA_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_EXPR:
#ifdef LIBXML_EXPR_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_SCHEMAS:
#ifdef LIBXML_SCHEMAS_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_SCHEMATRON:
#ifdef LIBXML_SCHEMATRON_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_MODULES:
#ifdef LIBXML_MODULES_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_DEBUG:
#ifdef LIBXML_DEBUG_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_DEBUG_MEM:
#ifdef DEBUG_MEMORY_LOCATION
            return(1);
#else
            return(0);
#endif
        case XML_WITH_DEBUG_RUN:
#ifdef LIBXML_DEBUG_RUNTIME
            return(1);
#else
            return(0);
#endif
        case XML_WITH_ZLIB:
#ifdef LIBXML_ZLIB_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_LZMA:
#ifdef LIBXML_LZMA_ENABLED
            return(1);
#else
            return(0);
#endif
        case XML_WITH_ICU:
#ifdef LIBXML_ICU_ENABLED
            return(1);
#else
            return(0);
#endif
        default:
            break;
     }
     return(0);
}

/************************************************************************
 *                                                                      *
 *              SAX2 defaulted attributes handling                      *
 *                                                                      *
 ************************************************************************/

/**
 * xmlDetectSAX2:
 * @ctxt:  an XML parser context
 *
 * Do the SAX2 detection and specific initialization
 */
static void
xmlDetectSAX2(xmlParserCtxtPtr ctxt) {
    xmlSAXHandlerPtr sax;

    /* Avoid unused variable warning if features are disabled. */
    (void) sax;

    if (ctxt == NULL) return;
    sax = ctxt->sax;
#ifdef LIBXML_SAX1_ENABLED
    if ((sax) &&  (sax->initialized == XML_SAX2_MAGIC) &&
        ((sax->startElementNs != NULL) ||
         (sax->endElementNs != NULL) ||
         ((sax->startElement == NULL) && (sax->endElement == NULL))))
        ctxt->sax2 = 1;
#else
    ctxt->sax2 = 1;
#endif /* LIBXML_SAX1_ENABLED */

    ctxt->str_xml = xmlDictLookup(ctxt->dict, BAD_CAST "xml", 3);
    ctxt->str_xmlns = xmlDictLookup(ctxt->dict, BAD_CAST "xmlns", 5);
    ctxt->str_xml_ns = xmlDictLookup(ctxt->dict, XML_XML_NAMESPACE, 36);
    if ((ctxt->str_xml==NULL) || (ctxt->str_xmlns==NULL) ||
                (ctxt->str_xml_ns == NULL)) {
        xmlErrMemory(ctxt, NULL);
    }
}

typedef struct _xmlDefAttrs xmlDefAttrs;
typedef xmlDefAttrs *xmlDefAttrsPtr;
struct _xmlDefAttrs {
    int nbAttrs;        /* number of defaulted attributes on that element */
    int maxAttrs;       /* the size of the array */
#if __STDC_VERSION__ >= 199901L
    /* Using a C99 flexible array member avoids UBSan errors. */
    const xmlChar *values[]; /* array of localname/prefix/values/external */
#else
    const xmlChar *values[5];
#endif
};

/**
 * xmlAttrNormalizeSpace:
 * @src: the source string
 * @dst: the target string
 *
 * Normalize the space in non CDATA attribute values:
 * If the attribute type is not CDATA, then the XML processor MUST further
 * process the normalized attribute value by discarding any leading and
 * trailing space (#x20) characters, and by replacing sequences of space
 * (#x20) characters by a single space (#x20) character.
 * Note that the size of dst need to be at least src, and if one doesn't need
 * to preserve dst (and it doesn't come from a dictionary or read-only) then
 * passing src as dst is just fine.
 *
 * Returns a pointer to the normalized value (dst) or NULL if no conversion
 *         is needed.
 */
static xmlChar *
xmlAttrNormalizeSpace(const xmlChar *src, xmlChar *dst)
{
    if ((src == NULL) || (dst == NULL))
        return(NULL);

    while (*src == 0x20) src++;
    while (*src != 0) {
        if (*src == 0x20) {
            while (*src == 0x20) src++;
            if (*src != 0)
                *dst++ = 0x20;
        } else {
            *dst++ = *src++;
        }
    }
    *dst = 0;
    if (dst == src)
       return(NULL);
    return(dst);
}

/**
 * xmlAttrNormalizeSpace2:
 * @src: the source string
 *
 * Normalize the space in non CDATA attribute values, a slightly more complex
 * front end to avoid allocation problems when running on attribute values
 * coming from the input.
 *
 * Returns a pointer to the normalized value (dst) or NULL if no conversion
 *         is needed.
 */
static const xmlChar *
xmlAttrNormalizeSpace2(xmlParserCtxtPtr ctxt, xmlChar *src, int *len)
{
    int i;
    int remove_head = 0;
    int need_realloc = 0;
    const xmlChar *cur;

    if ((ctxt == NULL) || (src == NULL) || (len == NULL))
        return(NULL);
    i = *len;
    if (i <= 0)
        return(NULL);

    cur = src;
    while (*cur == 0x20) {
        cur++;
        remove_head++;
    }
    while (*cur != 0) {
        if (*cur == 0x20) {
            cur++;
            if ((*cur == 0x20) || (*cur == 0)) {
                need_realloc = 1;
                break;
            }
        } else
            cur++;
    }
    if (need_realloc) {
        xmlChar *ret;

        ret = xmlStrndup(src + remove_head, i - remove_head + 1);
        if (ret == NULL) {
            xmlErrMemory(ctxt, NULL);
            return(NULL);
        }
        xmlAttrNormalizeSpace(ret, ret);
        *len = (int) strlen((const char *)ret);
        return(ret);
    } else if (remove_head) {
        *len -= remove_head;
        memmove(src, src + remove_head, 1 + *len);
        return(src);
    }
    return(NULL);
}

/**
 * xmlAddDefAttrs:
 * @ctxt:  an XML parser context
 * @fullname:  the element fullname
 * @fullattr:  the attribute fullname
 * @value:  the attribute value
 *
 * Add a defaulted attribute for an element
 */
static void
xmlAddDefAttrs(xmlParserCtxtPtr ctxt,
               const xmlChar *fullname,
               const xmlChar *fullattr,
               const xmlChar *value) {
    xmlDefAttrsPtr defaults;
    int len;
    const xmlChar *name;
    const xmlChar *prefix;

    /*
     * Allows to detect attribute redefinitions
     */
    if (ctxt->attsSpecial != NULL) {
        if (xmlHashLookup2(ctxt->attsSpecial, fullname, fullattr) != NULL)
            return;
    }

    if (ctxt->attsDefault == NULL) {
        ctxt->attsDefault = xmlHashCreateDict(10, ctxt->dict);
        if (ctxt->attsDefault == NULL)
            goto mem_error;
    }

    /*
     * split the element name into prefix:localname , the string found
     * are within the DTD and then not associated to namespace names.
     */
    name = xmlSplitQName3(fullname, &len);
    if (name == NULL) {
        name = xmlDictLookup(ctxt->dict, fullname, -1);
        prefix = NULL;
    } else {
        name = xmlDictLookup(ctxt->dict, name, -1);
        prefix = xmlDictLookup(ctxt->dict, fullname, len);
    }

    /*
     * make sure there is some storage
     */
    defaults = xmlHashLookup2(ctxt->attsDefault, name, prefix);
    if (defaults == NULL) {
        defaults = (xmlDefAttrsPtr) xmlMalloc(sizeof(xmlDefAttrs) +
                           (4 * 5) * sizeof(const xmlChar *));
        if (defaults == NULL)
            goto mem_error;
        defaults->nbAttrs = 0;
        defaults->maxAttrs = 4;
        if (xmlHashUpdateEntry2(ctxt->attsDefault, name, prefix,
                                defaults, NULL) < 0) {
            xmlFree(defaults);
            goto mem_error;
        }
    } else if (defaults->nbAttrs >= defaults->maxAttrs) {
        xmlDefAttrsPtr temp;

        temp = (xmlDefAttrsPtr) xmlRealloc(defaults, sizeof(xmlDefAttrs) +
                       (2 * defaults->maxAttrs * 5) * sizeof(const xmlChar *));
        if (temp == NULL)
            goto mem_error;
        defaults = temp;
        defaults->maxAttrs *= 2;
        if (xmlHashUpdateEntry2(ctxt->attsDefault, name, prefix,
                                defaults, NULL) < 0) {
            xmlFree(defaults);
            goto mem_error;
        }
    }

    /*
     * Split the element name into prefix:localname , the string found
     * are within the DTD and hen not associated to namespace names.
     */
    name = xmlSplitQName3(fullattr, &len);
    if (name == NULL) {
        name = xmlDictLookup(ctxt->dict, fullattr, -1);
        prefix = NULL;
    } else {
        name = xmlDictLookup(ctxt->dict, name, -1);
        prefix = xmlDictLookup(ctxt->dict, fullattr, len);
    }

    defaults->values[5 * defaults->nbAttrs] = name;
    defaults->values[5 * defaults->nbAttrs + 1] = prefix;
    /* intern the string and precompute the end */
    len = xmlStrlen(value);
    value = xmlDictLookup(ctxt->dict, value, len);
    defaults->values[5 * defaults->nbAttrs + 2] = value;
    defaults->values[5 * defaults->nbAttrs + 3] = value + len;
    if (ctxt->external)
        defaults->values[5 * defaults->nbAttrs + 4] = BAD_CAST "external";
    else
        defaults->values[5 * defaults->nbAttrs + 4] = NULL;
    defaults->nbAttrs++;

    return;

mem_error:
    xmlErrMemory(ctxt, NULL);
    return;
}

/**
 * xmlAddSpecialAttr:
 * @ctxt:  an XML parser context
 * @fullname:  the element fullname
 * @fullattr:  the attribute fullname
 * @type:  the attribute type
 *
 * Register this attribute type
 */
static void
xmlAddSpecialAttr(xmlParserCtxtPtr ctxt,
                  const xmlChar *fullname,
                  const xmlChar *fullattr,
                  int type)
{
    if (ctxt->attsSpecial == NULL) {
        ctxt->attsSpecial = xmlHashCreateDict(10, ctxt->dict);
        if (ctxt->attsSpecial == NULL)
            goto mem_error;
    }

    if (xmlHashLookup2(ctxt->attsSpecial, fullname, fullattr) != NULL)
        return;

    xmlHashAddEntry2(ctxt->attsSpecial, fullname, fullattr,
                     (void *) (ptrdiff_t) type);
    return;

mem_error:
    xmlErrMemory(ctxt, NULL);
    return;
}

/**
 * xmlCleanSpecialAttrCallback:
 *
 * Removes CDATA attributes from the special attribute table
 */
static void
xmlCleanSpecialAttrCallback(void *payload, void *data,
                            const xmlChar *fullname, const xmlChar *fullattr,
                            const xmlChar *unused ATTRIBUTE_UNUSED) {
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) data;

    if (((ptrdiff_t) payload) == XML_ATTRIBUTE_CDATA) {
        xmlHashRemoveEntry2(ctxt->attsSpecial, fullname, fullattr, NULL);
    }
}

/**
 * xmlCleanSpecialAttr:
 * @ctxt:  an XML parser context
 *
 * Trim the list of attributes defined to remove all those of type
 * CDATA as they are not special. This call should be done when finishing
 * to parse the DTD and before starting to parse the document root.
 */
static void
xmlCleanSpecialAttr(xmlParserCtxtPtr ctxt)
{
    if (ctxt->attsSpecial == NULL)
        return;

    xmlHashScanFull(ctxt->attsSpecial, xmlCleanSpecialAttrCallback, ctxt);

    if (xmlHashSize(ctxt->attsSpecial) == 0) {
        xmlHashFree(ctxt->attsSpecial, NULL);
        ctxt->attsSpecial = NULL;
    }
    return;
}

/**
 * xmlCheckLanguageID:
 * @lang:  pointer to the string value
 *
 * Checks that the value conforms to the LanguageID production:
 *
 * NOTE: this is somewhat deprecated, those productions were removed from
 *       the XML Second edition.
 *
 * [33] LanguageID ::= Langcode ('-' Subcode)*
 * [34] Langcode ::= ISO639Code |  IanaCode |  UserCode
 * [35] ISO639Code ::= ([a-z] | [A-Z]) ([a-z] | [A-Z])
 * [36] IanaCode ::= ('i' | 'I') '-' ([a-z] | [A-Z])+
 * [37] UserCode ::= ('x' | 'X') '-' ([a-z] | [A-Z])+
 * [38] Subcode ::= ([a-z] | [A-Z])+
 *
 * The current REC reference the successors of RFC 1766, currently 5646
 *
 * http://www.rfc-editor.org/rfc/rfc5646.txt
 * langtag       = language
 *                 ["-" script]
 *                 ["-" region]
 *                 *("-" variant)
 *                 *("-" extension)
 *                 ["-" privateuse]
 * language      = 2*3ALPHA            ; shortest ISO 639 code
 *                 ["-" extlang]       ; sometimes followed by
 *                                     ; extended language subtags
 *               / 4ALPHA              ; or reserved for future use
 *               / 5*8ALPHA            ; or registered language subtag
 *
 * extlang       = 3ALPHA              ; selected ISO 639 codes
 *                 *2("-" 3ALPHA)      ; permanently reserved
 *
 * script        = 4ALPHA              ; ISO 15924 code
 *
 * region        = 2ALPHA              ; ISO 3166-1 code
 *               / 3DIGIT              ; UN M.49 code
 *
 * variant       = 5*8alphanum         ; registered variants
 *               / (DIGIT 3alphanum)
 *
 * extension     = singleton 1*("-" (2*8alphanum))
 *
 *                                     ; Single alphanumerics
 *                                     ; "x" reserved for private use
 * singleton     = DIGIT               ; 0 - 9
 *               / %x41-57             ; A - W
 *               / %x59-5A             ; Y - Z
 *               / %x61-77             ; a - w
 *               / %x79-7A             ; y - z
 *
 * it sounds right to still allow Irregular i-xxx IANA and user codes too
 * The parser below doesn't try to cope with extension or privateuse
 * that could be added but that's not interoperable anyway
 *
 * Returns 1 if correct 0 otherwise
 **/
int
xmlCheckLanguageID(const xmlChar * lang)
{
    const xmlChar *cur = lang, *nxt;

    if (cur == NULL)
        return (0);
    if (((cur[0] == 'i') && (cur[1] == '-')) ||
        ((cur[0] == 'I') && (cur[1] == '-')) ||
        ((cur[0] == 'x') && (cur[1] == '-')) ||
        ((cur[0] == 'X') && (cur[1] == '-'))) {
        /*
         * Still allow IANA code and user code which were coming
         * from the previous version of the XML-1.0 specification
         * it's deprecated but we should not fail
         */
        cur += 2;
        while (((cur[0] >= 'A') && (cur[0] <= 'Z')) ||
               ((cur[0] >= 'a') && (cur[0] <= 'z')))
            cur++;
        return(cur[0] == 0);
    }
    nxt = cur;
    while (((nxt[0] >= 'A') && (nxt[0] <= 'Z')) ||
           ((nxt[0] >= 'a') && (nxt[0] <= 'z')))
           nxt++;
    if (nxt - cur >= 4) {
        /*
         * Reserved
         */
        if ((nxt - cur > 8) || (nxt[0] != 0))
            return(0);
        return(1);
    }
    if (nxt - cur < 2)
        return(0);
    /* we got an ISO 639 code */
    if (nxt[0] == 0)
        return(1);
    if (nxt[0] != '-')
        return(0);

    nxt++;
    cur = nxt;
    /* now we can have extlang or script or region or variant */
    if ((nxt[0] >= '0') && (nxt[0] <= '9'))
        goto region_m49;

    while (((nxt[0] >= 'A') && (nxt[0] <= 'Z')) ||
           ((nxt[0] >= 'a') && (nxt[0] <= 'z')))
           nxt++;
    if (nxt - cur == 4)
        goto script;
    if (nxt - cur == 2)
        goto region;
    if ((nxt - cur >= 5) && (nxt - cur <= 8))
        goto variant;
    if (nxt - cur != 3)
        return(0);
    /* we parsed an extlang */
    if (nxt[0] == 0)
        return(1);
    if (nxt[0] != '-')
        return(0);

    nxt++;
    cur = nxt;
    /* now we can have script or region or variant */
    if ((nxt[0] >= '0') && (nxt[0] <= '9'))
        goto region_m49;

    while (((nxt[0] >= 'A') && (nxt[0] <= 'Z')) ||
           ((nxt[0] >= 'a') && (nxt[0] <= 'z')))
           nxt++;
    if (nxt - cur == 2)
        goto region;
    if ((nxt - cur >= 5) && (nxt - cur <= 8))
        goto variant;
    if (nxt - cur != 4)
        return(0);
    /* we parsed a script */
script:
    if (nxt[0] == 0)
        return(1);
    if (nxt[0] != '-')
        return(0);

    nxt++;
    cur = nxt;
    /* now we can have region or variant */
    if ((nxt[0] >= '0') && (nxt[0] <= '9'))
        goto region_m49;

    while (((nxt[0] >= 'A') && (nxt[0] <= 'Z')) ||
           ((nxt[0] >= 'a') && (nxt[0] <= 'z')))
           nxt++;

    if ((nxt - cur >= 5) && (nxt - cur <= 8))
        goto variant;
    if (nxt - cur != 2)
        return(0);
    /* we parsed a region */
region:
    if (nxt[0] == 0)
        return(1);
    if (nxt[0] != '-')
        return(0);

    nxt++;
    cur = nxt;
    /* now we can just have a variant */
    while (((nxt[0] >= 'A') && (nxt[0] <= 'Z')) ||
           ((nxt[0] >= 'a') && (nxt[0] <= 'z')))
           nxt++;

    if ((nxt - cur < 5) || (nxt - cur > 8))
        return(0);

    /* we parsed a variant */
variant:
    if (nxt[0] == 0)
        return(1);
    if (nxt[0] != '-')
        return(0);
    /* extensions and private use subtags not checked */
    return (1);

region_m49:
    if (((nxt[1] >= '0') && (nxt[1] <= '9')) &&
        ((nxt[2] >= '0') && (nxt[2] <= '9'))) {
        nxt += 3;
        goto region;
    }
    return(0);
}

/************************************************************************
 *                                                                      *
 *              Parser stacks related functions and macros              *
 *                                                                      *
 ************************************************************************/

static xmlEntityPtr xmlParseStringEntityRef(xmlParserCtxtPtr ctxt,
                                            const xmlChar ** str);

#ifdef SAX2
/**
 * nsPush:
 * @ctxt:  an XML parser context
 * @prefix:  the namespace prefix or NULL
 * @URL:  the namespace name
 *
 * Pushes a new parser namespace on top of the ns stack
 *
 * Returns -1 in case of error, -2 if the namespace should be discarded
 *         and the index in the stack otherwise.
 */
static int
nsPush(xmlParserCtxtPtr ctxt, const xmlChar *prefix, const xmlChar *URL)
{
    if (ctxt->options & XML_PARSE_NSCLEAN) {
        int i;
        for (i = ctxt->nsNr - 2;i >= 0;i -= 2) {
            if (ctxt->nsTab[i] == prefix) {
                /* in scope */
                if (ctxt->nsTab[i + 1] == URL)
                    return(-2);
                /* out of scope keep it */
                break;
            }
        }
    }
    if ((ctxt->nsMax == 0) || (ctxt->nsTab == NULL)) {
        ctxt->nsMax = 10;
        ctxt->nsNr = 0;
        ctxt->nsTab = (const xmlChar **)
                      xmlMalloc(ctxt->nsMax * sizeof(xmlChar *));
        if (ctxt->nsTab == NULL) {
            xmlErrMemory(ctxt, NULL);
            ctxt->nsMax = 0;
            return (-1);
        }
    } else if (ctxt->nsNr >= ctxt->nsMax) {
        const xmlChar ** tmp;
        ctxt->nsMax *= 2;
        tmp = (const xmlChar **) xmlRealloc((char *) ctxt->nsTab,
                                    ctxt->nsMax * sizeof(ctxt->nsTab[0]));
        if (tmp == NULL) {
            xmlErrMemory(ctxt, NULL);
            ctxt->nsMax /= 2;
            return (-1);
        }
        ctxt->nsTab = tmp;
    }
    ctxt->nsTab[ctxt->nsNr++] = prefix;
    ctxt->nsTab[ctxt->nsNr++] = URL;
    return (ctxt->nsNr);
}
/**
 * nsPop:
 * @ctxt: an XML parser context
 * @nr:  the number to pop
 *
 * Pops the top @nr parser prefix/namespace from the ns stack
 *
 * Returns the number of namespaces removed
 */
static int
nsPop(xmlParserCtxtPtr ctxt, int nr)
{
    int i;

    if (ctxt->nsTab == NULL) return(0);
    if (ctxt->nsNr < nr) {
        xmlGenericError(xmlGenericErrorContext, "Pbm popping %d NS\n", nr);
        nr = ctxt->nsNr;
    }
    if (ctxt->nsNr <= 0)
        return (0);

    for (i = 0;i < nr;i++) {
         ctxt->nsNr--;
         ctxt->nsTab[ctxt->nsNr] = NULL;
    }
    return(nr);
}
#endif

static int
xmlCtxtGrowAttrs(xmlParserCtxtPtr ctxt, int nr) {
    const xmlChar **atts;
    int *attallocs;
    int maxatts;

    if (ctxt->atts == NULL) {
        maxatts = 55; /* allow for 10 attrs by default */
        atts = (const xmlChar **)
               xmlMalloc(maxatts * sizeof(xmlChar *));
        if (atts == NULL) goto mem_error;
        ctxt->atts = atts;
        attallocs = (int *) xmlMalloc((maxatts / 5) * sizeof(int));
        if (attallocs == NULL) goto mem_error;
        ctxt->attallocs = attallocs;
        ctxt->maxatts = maxatts;
    } else if (nr + 5 > ctxt->maxatts) {
        maxatts = (nr + 5) * 2;
        atts = (const xmlChar **) xmlRealloc((void *) ctxt->atts,
                                     maxatts * sizeof(const xmlChar *));
        if (atts == NULL) goto mem_error;
        ctxt->atts = atts;
        attallocs = (int *) xmlRealloc((void *) ctxt->attallocs,
                                     (maxatts / 5) * sizeof(int));
        if (attallocs == NULL) goto mem_error;
        ctxt->attallocs = attallocs;
        ctxt->maxatts = maxatts;
    }
    return(ctxt->maxatts);
mem_error:
    xmlErrMemory(ctxt, NULL);
    return(-1);
}

/**
 * inputPush:
 * @ctxt:  an XML parser context
 * @value:  the parser input
 *
 * Pushes a new parser input on top of the input stack
 *
 * Returns -1 in case of error, the index in the stack otherwise
 */
int
inputPush(xmlParserCtxtPtr ctxt, xmlParserInputPtr value)
{
    if ((ctxt == NULL) || (value == NULL))
        return(-1);
    if (ctxt->inputNr >= ctxt->inputMax) {
        ctxt->inputMax *= 2;
        ctxt->inputTab =
            (xmlParserInputPtr *) xmlRealloc(ctxt->inputTab,
                                             ctxt->inputMax *
                                             sizeof(ctxt->inputTab[0]));
        if (ctxt->inputTab == NULL) {
            xmlErrMemory(ctxt, NULL);
            ctxt->inputMax /= 2;
            return (-1);
        }
    }
    ctxt->inputTab[ctxt->inputNr] = value;
    ctxt->input = value;
    return (ctxt->inputNr++);
}
/**
 * inputPop:
 * @ctxt: an XML parser context
 *
 * Pops the top parser input from the input stack
 *
 * Returns the input just removed
 */
xmlParserInputPtr
inputPop(xmlParserCtxtPtr ctxt)
{
    xmlParserInputPtr ret;

    if (ctxt == NULL)
        return(NULL);
    if (ctxt->inputNr <= 0)
        return (NULL);
    ctxt->inputNr--;
    if (ctxt->inputNr > 0)
        ctxt->input = ctxt->inputTab[ctxt->inputNr - 1];
    else
        ctxt->input = NULL;
    ret = ctxt->inputTab[ctxt->inputNr];
    ctxt->inputTab[ctxt->inputNr] = NULL;
    return (ret);
}
/**
 * nodePush:
 * @ctxt:  an XML parser context
 * @value:  the element node
 *
 * Pushes a new element node on top of the node stack
 *
 * Returns -1 in case of error, the index in the stack otherwise
 */
int
nodePush(xmlParserCtxtPtr ctxt, xmlNodePtr value)
{
    if (ctxt == NULL) return(0);
    if (ctxt->nodeNr >= ctxt->nodeMax) {
        xmlNodePtr *tmp;

        tmp = (xmlNodePtr *) xmlRealloc(ctxt->nodeTab,
                                      ctxt->nodeMax * 2 *
                                      sizeof(ctxt->nodeTab[0]));
        if (tmp == NULL) {
            xmlErrMemory(ctxt, NULL);
            return (-1);
        }
        ctxt->nodeTab = tmp;
        ctxt->nodeMax *= 2;
    }
    if ((((unsigned int) ctxt->nodeNr) > xmlParserMaxDepth) &&
        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INTERNAL_ERROR,
                 "Excessive depth in document: %d use XML_PARSE_HUGE option\n",
                          xmlParserMaxDepth);
        xmlHaltParser(ctxt);
        return(-1);
    }
    ctxt->nodeTab[ctxt->nodeNr] = value;
    ctxt->node = value;
    return (ctxt->nodeNr++);
}

/**
 * nodePop:
 * @ctxt: an XML parser context
 *
 * Pops the top element node from the node stack
 *
 * Returns the node just removed
 */
xmlNodePtr
nodePop(xmlParserCtxtPtr ctxt)
{
    xmlNodePtr ret;

    if (ctxt == NULL) return(NULL);
    if (ctxt->nodeNr <= 0)
        return (NULL);
    ctxt->nodeNr--;
    if (ctxt->nodeNr > 0)
        ctxt->node = ctxt->nodeTab[ctxt->nodeNr - 1];
    else
        ctxt->node = NULL;
    ret = ctxt->nodeTab[ctxt->nodeNr];
    ctxt->nodeTab[ctxt->nodeNr] = NULL;
    return (ret);
}

/**
 * nameNsPush:
 * @ctxt:  an XML parser context
 * @value:  the element name
 * @prefix:  the element prefix
 * @URI:  the element namespace name
 * @line:  the current line number for error messages
 * @nsNr:  the number of namespaces pushed on the namespace table
 *
 * Pushes a new element name/prefix/URL on top of the name stack
 *
 * Returns -1 in case of error, the index in the stack otherwise
 */
static int
nameNsPush(xmlParserCtxtPtr ctxt, const xmlChar * value,
           const xmlChar *prefix, const xmlChar *URI, int line, int nsNr)
{
    xmlStartTag *tag;

    if (ctxt->nameNr >= ctxt->nameMax) {
        const xmlChar * *tmp;
        xmlStartTag *tmp2;
        ctxt->nameMax *= 2;
        tmp = (const xmlChar * *) xmlRealloc((xmlChar * *)ctxt->nameTab,
                                    ctxt->nameMax *
                                    sizeof(ctxt->nameTab[0]));
        if (tmp == NULL) {
            ctxt->nameMax /= 2;
            goto mem_error;
        }
        ctxt->nameTab = tmp;
        tmp2 = (xmlStartTag *) xmlRealloc((void * *)ctxt->pushTab,
                                    ctxt->nameMax *
                                    sizeof(ctxt->pushTab[0]));
        if (tmp2 == NULL) {
            ctxt->nameMax /= 2;
            goto mem_error;
        }
        ctxt->pushTab = tmp2;
    } else if (ctxt->pushTab == NULL) {
        ctxt->pushTab = (xmlStartTag *) xmlMalloc(ctxt->nameMax *
                                            sizeof(ctxt->pushTab[0]));
        if (ctxt->pushTab == NULL)
            goto mem_error;
    }
    ctxt->nameTab[ctxt->nameNr] = value;
    ctxt->name = value;
    tag = &ctxt->pushTab[ctxt->nameNr];
    tag->prefix = prefix;
    tag->URI = URI;
    tag->line = line;
    tag->nsNr = nsNr;
    return (ctxt->nameNr++);
mem_error:
    xmlErrMemory(ctxt, NULL);
    return (-1);
}
#ifdef LIBXML_PUSH_ENABLED
/**
 * nameNsPop:
 * @ctxt: an XML parser context
 *
 * Pops the top element/prefix/URI name from the name stack
 *
 * Returns the name just removed
 */
static const xmlChar *
nameNsPop(xmlParserCtxtPtr ctxt)
{
    const xmlChar *ret;

    if (ctxt->nameNr <= 0)
        return (NULL);
    ctxt->nameNr--;
    if (ctxt->nameNr > 0)
        ctxt->name = ctxt->nameTab[ctxt->nameNr - 1];
    else
        ctxt->name = NULL;
    ret = ctxt->nameTab[ctxt->nameNr];
    ctxt->nameTab[ctxt->nameNr] = NULL;
    return (ret);
}
#endif /* LIBXML_PUSH_ENABLED */

/**
 * namePush:
 * @ctxt:  an XML parser context
 * @value:  the element name
 *
 * Pushes a new element name on top of the name stack
 *
 * Returns -1 in case of error, the index in the stack otherwise
 */
int
namePush(xmlParserCtxtPtr ctxt, const xmlChar * value)
{
    if (ctxt == NULL) return (-1);

    if (ctxt->nameNr >= ctxt->nameMax) {
        const xmlChar * *tmp;
        tmp = (const xmlChar * *) xmlRealloc((xmlChar * *)ctxt->nameTab,
                                    ctxt->nameMax * 2 *
                                    sizeof(ctxt->nameTab[0]));
        if (tmp == NULL) {
            goto mem_error;
        }
        ctxt->nameTab = tmp;
        ctxt->nameMax *= 2;
    }
    ctxt->nameTab[ctxt->nameNr] = value;
    ctxt->name = value;
    return (ctxt->nameNr++);
mem_error:
    xmlErrMemory(ctxt, NULL);
    return (-1);
}
/**
 * namePop:
 * @ctxt: an XML parser context
 *
 * Pops the top element name from the name stack
 *
 * Returns the name just removed
 */
const xmlChar *
namePop(xmlParserCtxtPtr ctxt)
{
    const xmlChar *ret;

    if ((ctxt == NULL) || (ctxt->nameNr <= 0))
        return (NULL);
    ctxt->nameNr--;
    if (ctxt->nameNr > 0)
        ctxt->name = ctxt->nameTab[ctxt->nameNr - 1];
    else
        ctxt->name = NULL;
    ret = ctxt->nameTab[ctxt->nameNr];
    ctxt->nameTab[ctxt->nameNr] = NULL;
    return (ret);
}

static int spacePush(xmlParserCtxtPtr ctxt, int val) {
    if (ctxt->spaceNr >= ctxt->spaceMax) {
        int *tmp;

        ctxt->spaceMax *= 2;
        tmp = (int *) xmlRealloc(ctxt->spaceTab,
                                 ctxt->spaceMax * sizeof(ctxt->spaceTab[0]));
        if (tmp == NULL) {
            xmlErrMemory(ctxt, NULL);
            ctxt->spaceMax /=2;
            return(-1);
        }
        ctxt->spaceTab = tmp;
    }
    ctxt->spaceTab[ctxt->spaceNr] = val;
    ctxt->space = &ctxt->spaceTab[ctxt->spaceNr];
    return(ctxt->spaceNr++);
}

static int spacePop(xmlParserCtxtPtr ctxt) {
    int ret;
    if (ctxt->spaceNr <= 0) return(0);
    ctxt->spaceNr--;
    if (ctxt->spaceNr > 0)
        ctxt->space = &ctxt->spaceTab[ctxt->spaceNr - 1];
    else
        ctxt->space = &ctxt->spaceTab[0];
    ret = ctxt->spaceTab[ctxt->spaceNr];
    ctxt->spaceTab[ctxt->spaceNr] = -1;
    return(ret);
}

/*
 * Macros for accessing the content. Those should be used only by the parser,
 * and not exported.
 *
 * Dirty macros, i.e. one often need to make assumption on the context to
 * use them
 *
 *   CUR_PTR return the current pointer to the xmlChar to be parsed.
 *           To be used with extreme caution since operations consuming
 *           characters may move the input buffer to a different location !
 *   CUR     returns the current xmlChar value, i.e. a 8 bit value if compiled
 *           This should be used internally by the parser
 *           only to compare to ASCII values otherwise it would break when
 *           running with UTF-8 encoding.
 *   RAW     same as CUR but in the input buffer, bypass any token
 *           extraction that may have been done
 *   NXT(n)  returns the n'th next xmlChar. Same as CUR is should be used only
 *           to compare on ASCII based substring.
 *   SKIP(n) Skip n xmlChar, and must also be used only to skip ASCII defined
 *           strings without newlines within the parser.
 *   NEXT1(l) Skip 1 xmlChar, and must also be used only to skip 1 non-newline ASCII
 *           defined char within the parser.
 * Clean macros, not dependent of an ASCII context, expect UTF-8 encoding
 *
 *   NEXT    Skip to the next character, this does the proper decoding
 *           in UTF-8 mode. It also pop-up unfinished entities on the fly.
 *   NEXTL(l) Skip the current unicode character of l xmlChars long.
 *   CUR_CHAR(l) returns the current unicode character (int), set l
 *           to the number of xmlChars used for the encoding [0-5].
 *   CUR_SCHAR  same but operate on a string instead of the context
 *   COPY_BUF  copy the current unicode char to the target buffer, increment
 *            the index
 *   GROW, SHRINK  handling of input buffers
 */

#define RAW (*ctxt->input->cur)
#define CUR (*ctxt->input->cur)
#define NXT(val) ctxt->input->cur[(val)]
#define CUR_PTR ctxt->input->cur
#define BASE_PTR ctxt->input->base

#define CMP4( s, c1, c2, c3, c4 ) \
  ( ((unsigned char *) s)[ 0 ] == c1 && ((unsigned char *) s)[ 1 ] == c2 && \
    ((unsigned char *) s)[ 2 ] == c3 && ((unsigned char *) s)[ 3 ] == c4 )
#define CMP5( s, c1, c2, c3, c4, c5 ) \
  ( CMP4( s, c1, c2, c3, c4 ) && ((unsigned char *) s)[ 4 ] == c5 )
#define CMP6( s, c1, c2, c3, c4, c5, c6 ) \
  ( CMP5( s, c1, c2, c3, c4, c5 ) && ((unsigned char *) s)[ 5 ] == c6 )
#define CMP7( s, c1, c2, c3, c4, c5, c6, c7 ) \
  ( CMP6( s, c1, c2, c3, c4, c5, c6 ) && ((unsigned char *) s)[ 6 ] == c7 )
#define CMP8( s, c1, c2, c3, c4, c5, c6, c7, c8 ) \
  ( CMP7( s, c1, c2, c3, c4, c5, c6, c7 ) && ((unsigned char *) s)[ 7 ] == c8 )
#define CMP9( s, c1, c2, c3, c4, c5, c6, c7, c8, c9 ) \
  ( CMP8( s, c1, c2, c3, c4, c5, c6, c7, c8 ) && \
    ((unsigned char *) s)[ 8 ] == c9 )
#define CMP10( s, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10 ) \
  ( CMP9( s, c1, c2, c3, c4, c5, c6, c7, c8, c9 ) && \
    ((unsigned char *) s)[ 9 ] == c10 )

#define SKIP(val) do {                                                  \
    ctxt->input->cur += (val),ctxt->input->col+=(val);                  \
    if (*ctxt->input->cur == 0)                                         \
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);                   \
  } while (0)

#define SKIPL(val) do {                                                 \
    int skipl;                                                          \
    for(skipl=0; skipl<val; skipl++) {                                  \
        if (*(ctxt->input->cur) == '\n') {                              \
        ctxt->input->line++; ctxt->input->col = 1;                      \
        } else ctxt->input->col++;                                      \
        ctxt->input->cur++;                                             \
    }                                                                   \
    if (*ctxt->input->cur == 0)                                         \
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);                   \
  } while (0)

#define SHRINK if ((ctxt->progressive == 0) &&                          \
                   (ctxt->input->cur - ctxt->input->base > 2 * INPUT_CHUNK) && \
                   (ctxt->input->end - ctxt->input->cur < 2 * INPUT_CHUNK)) \
        xmlSHRINK (ctxt);

static void xmlSHRINK (xmlParserCtxtPtr ctxt) {
    xmlParserInputShrink(ctxt->input);
    if (*ctxt->input->cur == 0)
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
}

#define GROW if ((ctxt->progressive == 0) &&                            \
                 (ctxt->input->end - ctxt->input->cur < INPUT_CHUNK))   \
        xmlGROW (ctxt);

static void xmlGROW (xmlParserCtxtPtr ctxt) {
    ptrdiff_t curEnd = ctxt->input->end - ctxt->input->cur;
    ptrdiff_t curBase = ctxt->input->cur - ctxt->input->base;

    if (((curEnd > XML_MAX_LOOKUP_LIMIT) ||
         (curBase > XML_MAX_LOOKUP_LIMIT)) &&
         ((ctxt->input->buf) &&
          (ctxt->input->buf->readcallback != xmlInputReadCallbackNop)) &&
        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "Huge input lookup");
        xmlHaltParser(ctxt);
        return;
    }
    xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
    if ((ctxt->input->cur > ctxt->input->end) ||
        (ctxt->input->cur < ctxt->input->base)) {
        xmlHaltParser(ctxt);
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "cur index out of bound");
        return;
    }
    if ((ctxt->input->cur != NULL) && (*ctxt->input->cur == 0))
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
}

#define SKIP_BLANKS xmlSkipBlankChars(ctxt)

#define NEXT xmlNextChar(ctxt)

#define NEXT1 {                                                         \
        ctxt->input->col++;                                             \
        ctxt->input->cur++;                                             \
        if (*ctxt->input->cur == 0)                                     \
            xmlParserInputGrow(ctxt->input, INPUT_CHUNK);               \
    }

#define NEXTL(l) do {                                                   \
    if (*(ctxt->input->cur) == '\n') {                                  \
        ctxt->input->line++; ctxt->input->col = 1;                      \
    } else ctxt->input->col++;                                          \
    ctxt->input->cur += l;                              \
  } while (0)

#define CUR_CHAR(l) xmlCurrentChar(ctxt, &l)
#define CUR_SCHAR(s, l) xmlStringCurrentChar(ctxt, s, &l)

#define COPY_BUF(l,b,i,v)                                               \
    if (l == 1) b[i++] = (xmlChar) v;                                   \
    else i += xmlCopyCharMultiByte(&b[i],v)

#define CUR_CONSUMED \
    (ctxt->input->consumed + (ctxt->input->cur - ctxt->input->base))

/**
 * xmlSkipBlankChars:
 * @ctxt:  the XML parser context
 *
 * skip all blanks character found at that point in the input streams.
 * It pops up finished entities in the process if allowable at that point.
 *
 * Returns the number of space chars skipped
 */

int
xmlSkipBlankChars(xmlParserCtxtPtr ctxt) {
    int res = 0;

    /*
     * It's Okay to use CUR/NEXT here since all the blanks are on
     * the ASCII range.
     */
    if (((ctxt->inputNr == 1) && (ctxt->instate != XML_PARSER_DTD)) ||
        (ctxt->instate == XML_PARSER_START)) {
        const xmlChar *cur;
        /*
         * if we are in the document content, go really fast
         */
        cur = ctxt->input->cur;
        while (IS_BLANK_CH(*cur)) {
            if (*cur == '\n') {
                ctxt->input->line++; ctxt->input->col = 1;
            } else {
                ctxt->input->col++;
            }
            cur++;
            if (res < INT_MAX)
                res++;
            if (*cur == 0) {
                ctxt->input->cur = cur;
                xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                cur = ctxt->input->cur;
            }
        }
        ctxt->input->cur = cur;
    } else {
        int expandPE = ((ctxt->external != 0) || (ctxt->inputNr != 1));

        while (1) {
            if (IS_BLANK_CH(CUR)) { /* CHECKED tstblanks.xml */
                NEXT;
            } else if (CUR == '%') {
                /*
                 * Need to handle support of entities branching here
                 */
                if ((expandPE == 0) || (IS_BLANK_CH(NXT(1))) || (NXT(1) == 0))
                    break;
                xmlParsePEReference(ctxt);
            } else if (CUR == 0) {
                if (ctxt->inputNr <= 1)
                    break;
                xmlPopInput(ctxt);
            } else {
                break;
            }

            /*
             * Also increase the counter when entering or exiting a PERef.
             * The spec says: "When a parameter-entity reference is recognized
             * in the DTD and included, its replacement text MUST be enlarged
             * by the attachment of one leading and one following space (#x20)
             * character."
             */
            if (res < INT_MAX)
                res++;
        }
    }
    return(res);
}

/************************************************************************
 *                                                                      *
 *              Commodity functions to handle entities                  *
 *                                                                      *
 ************************************************************************/

/**
 * xmlPopInput:
 * @ctxt:  an XML parser context
 *
 * xmlPopInput: the current input pointed by ctxt->input came to an end
 *          pop it and return the next char.
 *
 * Returns the current xmlChar in the parser context
 */
xmlChar
xmlPopInput(xmlParserCtxtPtr ctxt) {
    if ((ctxt == NULL) || (ctxt->inputNr <= 1)) return(0);
    if (xmlParserDebugEntities)
        xmlGenericError(xmlGenericErrorContext,
                "Popping input %d\n", ctxt->inputNr);
    if ((ctxt->inputNr > 1) && (ctxt->inSubset == 0) &&
        (ctxt->instate != XML_PARSER_EOF))
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                    "Unfinished entity outside the DTD");
    xmlFreeInputStream(inputPop(ctxt));
    if (*ctxt->input->cur == 0)
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
    return(CUR);
}

/**
 * xmlPushInput:
 * @ctxt:  an XML parser context
 * @input:  an XML parser input fragment (entity, XML fragment ...).
 *
 * xmlPushInput: switch to a new input stream which is stacked on top
 *               of the previous one(s).
 * Returns -1 in case of error or the index in the input stack
 */
int
xmlPushInput(xmlParserCtxtPtr ctxt, xmlParserInputPtr input) {
    int ret;
    if (input == NULL) return(-1);

    if (xmlParserDebugEntities) {
        if ((ctxt->input != NULL) && (ctxt->input->filename))
            xmlGenericError(xmlGenericErrorContext,
                    "%s(%d): ", ctxt->input->filename,
                    ctxt->input->line);
        xmlGenericError(xmlGenericErrorContext,
                "Pushing input %d : %.30s\n", ctxt->inputNr+1, input->cur);
    }
    if (((ctxt->inputNr > 40) && ((ctxt->options & XML_PARSE_HUGE) == 0)) ||
        (ctxt->inputNr > 1024)) {
        xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
        while (ctxt->inputNr > 1)
            xmlFreeInputStream(inputPop(ctxt));
        return(-1);
    }
    ret = inputPush(ctxt, input);
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);
    GROW;
    return(ret);
}

/**
 * xmlParseCharRef:
 * @ctxt:  an XML parser context
 *
 * parse Reference declarations
 *
 * [66] CharRef ::= '&#' [0-9]+ ';' |
 *                  '&#x' [0-9a-fA-F]+ ';'
 *
 * [ WFC: Legal Character ]
 * Characters referred to using character references must match the
 * production for Char.
 *
 * Returns the value parsed (as an int), 0 in case of error
 */
int
xmlParseCharRef(xmlParserCtxtPtr ctxt) {
    int val = 0;
    int count = 0;

    /*
     * Using RAW/CUR/NEXT is okay since we are working on ASCII range here
     */
    if ((RAW == '&') && (NXT(1) == '#') &&
        (NXT(2) == 'x')) {
        SKIP(3);
        GROW;
        while (RAW != ';') { /* loop blocked by count */
            if (count++ > 20) {
                count = 0;
                GROW;
                if (ctxt->instate == XML_PARSER_EOF)
                    return(0);
            }
            if ((RAW >= '0') && (RAW <= '9'))
                val = val * 16 + (CUR - '0');
            else if ((RAW >= 'a') && (RAW <= 'f') && (count < 20))
                val = val * 16 + (CUR - 'a') + 10;
            else if ((RAW >= 'A') && (RAW <= 'F') && (count < 20))
                val = val * 16 + (CUR - 'A') + 10;
            else {
                xmlFatalErr(ctxt, XML_ERR_INVALID_HEX_CHARREF, NULL);
                val = 0;
                break;
            }
            if (val > 0x110000)
                val = 0x110000;

            NEXT;
            count++;
        }
        if (RAW == ';') {
            /* on purpose to avoid reentrancy problems with NEXT and SKIP */
            ctxt->input->col++;
            ctxt->input->cur++;
        }
    } else if  ((RAW == '&') && (NXT(1) == '#')) {
        SKIP(2);
        GROW;
        while (RAW != ';') { /* loop blocked by count */
            if (count++ > 20) {
                count = 0;
                GROW;
                if (ctxt->instate == XML_PARSER_EOF)
                    return(0);
            }
            if ((RAW >= '0') && (RAW <= '9'))
                val = val * 10 + (CUR - '0');
            else {
                xmlFatalErr(ctxt, XML_ERR_INVALID_DEC_CHARREF, NULL);
                val = 0;
                break;
            }
            if (val > 0x110000)
                val = 0x110000;

            NEXT;
            count++;
        }
        if (RAW == ';') {
            /* on purpose to avoid reentrancy problems with NEXT and SKIP */
            ctxt->input->col++;
            ctxt->input->cur++;
        }
    } else {
        xmlFatalErr(ctxt, XML_ERR_INVALID_CHARREF, NULL);
    }

    /*
     * [ WFC: Legal Character ]
     * Characters referred to using character references must match the
     * production for Char.
     */
    if (val >= 0x110000) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                "xmlParseCharRef: character reference out of bounds\n",
                val);
    } else if (IS_CHAR(val)) {
        return(val);
    } else {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "xmlParseCharRef: invalid xmlChar value %d\n",
                          val);
    }
    return(0);
}

/**
 * xmlParseStringCharRef:
 * @ctxt:  an XML parser context
 * @str:  a pointer to an index in the string
 *
 * parse Reference declarations, variant parsing from a string rather
 * than an an input flow.
 *
 * [66] CharRef ::= '&#' [0-9]+ ';' |
 *                  '&#x' [0-9a-fA-F]+ ';'
 *
 * [ WFC: Legal Character ]
 * Characters referred to using character references must match the
 * production for Char.
 *
 * Returns the value parsed (as an int), 0 in case of error, str will be
 *         updated to the current value of the index
 */
static int
xmlParseStringCharRef(xmlParserCtxtPtr ctxt, const xmlChar **str) {
    const xmlChar *ptr;
    xmlChar cur;
    int val = 0;

    if ((str == NULL) || (*str == NULL)) return(0);
    ptr = *str;
    cur = *ptr;
    if ((cur == '&') && (ptr[1] == '#') && (ptr[2] == 'x')) {
        ptr += 3;
        cur = *ptr;
        while (cur != ';') { /* Non input consuming loop */
            if ((cur >= '0') && (cur <= '9'))
                val = val * 16 + (cur - '0');
            else if ((cur >= 'a') && (cur <= 'f'))
                val = val * 16 + (cur - 'a') + 10;
            else if ((cur >= 'A') && (cur <= 'F'))
                val = val * 16 + (cur - 'A') + 10;
            else {
                xmlFatalErr(ctxt, XML_ERR_INVALID_HEX_CHARREF, NULL);
                val = 0;
                break;
            }
            if (val > 0x110000)
                val = 0x110000;

            ptr++;
            cur = *ptr;
        }
        if (cur == ';')
            ptr++;
    } else if  ((cur == '&') && (ptr[1] == '#')){
        ptr += 2;
        cur = *ptr;
        while (cur != ';') { /* Non input consuming loops */
            if ((cur >= '0') && (cur <= '9'))
                val = val * 10 + (cur - '0');
            else {
                xmlFatalErr(ctxt, XML_ERR_INVALID_DEC_CHARREF, NULL);
                val = 0;
                break;
            }
            if (val > 0x110000)
                val = 0x110000;

            ptr++;
            cur = *ptr;
        }
        if (cur == ';')
            ptr++;
    } else {
        xmlFatalErr(ctxt, XML_ERR_INVALID_CHARREF, NULL);
        return(0);
    }
    *str = ptr;

    /*
     * [ WFC: Legal Character ]
     * Characters referred to using character references must match the
     * production for Char.
     */
    if (val >= 0x110000) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                "xmlParseStringCharRef: character reference out of bounds\n",
                val);
    } else if (IS_CHAR(val)) {
        return(val);
    } else {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "xmlParseStringCharRef: invalid xmlChar value %d\n",
                          val);
    }
    return(0);
}

/**
 * xmlParserHandlePEReference:
 * @ctxt:  the parser context
 *
 * [69] PEReference ::= '%' Name ';'
 *
 * [ WFC: No Recursion ]
 * A parsed entity must not contain a recursive
 * reference to itself, either directly or indirectly.
 *
 * [ WFC: Entity Declared ]
 * In a document without any DTD, a document with only an internal DTD
 * subset which contains no parameter entity references, or a document
 * with "standalone='yes'", ...  ... The declaration of a parameter
 * entity must precede any reference to it...
 *
 * [ VC: Entity Declared ]
 * In a document with an external subset or external parameter entities
 * with "standalone='no'", ...  ... The declaration of a parameter entity
 * must precede any reference to it...
 *
 * [ WFC: In DTD ]
 * Parameter-entity references may only appear in the DTD.
 * NOTE: misleading but this is handled.
 *
 * A PEReference may have been detected in the current input stream
 * the handling is done accordingly to
 *      http://www.w3.org/TR/REC-xml#entproc
 * i.e.
 *   - Included in literal in entity values
 *   - Included as Parameter Entity reference within DTDs
 */
void
xmlParserHandlePEReference(xmlParserCtxtPtr ctxt) {
    switch(ctxt->instate) {
        case XML_PARSER_CDATA_SECTION:
            return;
        case XML_PARSER_COMMENT:
            return;
        case XML_PARSER_START_TAG:
            return;
        case XML_PARSER_END_TAG:
            return;
        case XML_PARSER_EOF:
            xmlFatalErr(ctxt, XML_ERR_PEREF_AT_EOF, NULL);
            return;
        case XML_PARSER_PROLOG:
        case XML_PARSER_START:
        case XML_PARSER_MISC:
            xmlFatalErr(ctxt, XML_ERR_PEREF_IN_PROLOG, NULL);
            return;
        case XML_PARSER_ENTITY_DECL:
        case XML_PARSER_CONTENT:
        case XML_PARSER_ATTRIBUTE_VALUE:
        case XML_PARSER_PI:
        case XML_PARSER_SYSTEM_LITERAL:
        case XML_PARSER_PUBLIC_LITERAL:
            /* we just ignore it there */
            return;
        case XML_PARSER_EPILOG:
            xmlFatalErr(ctxt, XML_ERR_PEREF_IN_EPILOG, NULL);
            return;
        case XML_PARSER_ENTITY_VALUE:
            /*
             * NOTE: in the case of entity values, we don't do the
             *       substitution here since we need the literal
             *       entity value to be able to save the internal
             *       subset of the document.
             *       This will be handled by xmlStringDecodeEntities
             */
            return;
        case XML_PARSER_DTD:
            /*
             * [WFC: Well-Formedness Constraint: PEs in Internal Subset]
             * In the internal DTD subset, parameter-entity references
             * can occur only where markup declarations can occur, not
             * within markup declarations.
             * In that case this is handled in xmlParseMarkupDecl
             */
            if ((ctxt->external == 0) && (ctxt->inputNr == 1))
                return;
            if (IS_BLANK_CH(NXT(1)) || NXT(1) == 0)
                return;
            break;
        case XML_PARSER_IGNORE:
            return;
    }

    xmlParsePEReference(ctxt);
}

/*
 * Macro used to grow the current buffer.
 * buffer##_size is expected to be a size_t
 * mem_error: is expected to handle memory allocation failures
 */
#define growBuffer(buffer, n) {                                         \
    xmlChar *tmp;                                                       \
    size_t new_size = buffer##_size * 2 + n;                            \
    if (new_size < buffer##_size) goto mem_error;                       \
    tmp = (xmlChar *) xmlRealloc(buffer, new_size);                     \
    if (tmp == NULL) goto mem_error;                                    \
    buffer = tmp;                                                       \
    buffer##_size = new_size;                                           \
}

/**
 * xmlStringLenDecodeEntities:
 * @ctxt:  the parser context
 * @str:  the input string
 * @len: the string length
 * @what:  combination of XML_SUBSTITUTE_REF and XML_SUBSTITUTE_PEREF
 * @end:  an end marker xmlChar, 0 if none
 * @end2:  an end marker xmlChar, 0 if none
 * @end3:  an end marker xmlChar, 0 if none
 *
 * Takes a entity string content and process to do the adequate substitutions.
 *
 * [67] Reference ::= EntityRef | CharRef
 *
 * [69] PEReference ::= '%' Name ';'
 *
 * Returns A newly allocated string with the substitution done. The caller
 *      must deallocate it !
 */
xmlChar *
xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
                      int what, xmlChar end, xmlChar  end2, xmlChar end3) {
    xmlChar *buffer = NULL;
    size_t buffer_size = 0;
    size_t nbchars = 0;

    xmlChar *current = NULL;
    xmlChar *rep = NULL;
    const xmlChar *last;
    xmlEntityPtr ent;
    int c,l;

    if ((ctxt == NULL) || (str == NULL) || (len < 0))
        return(NULL);
    last = str + len;

    if (((ctxt->depth > 40) &&
         ((ctxt->options & XML_PARSE_HUGE) == 0)) ||
        (ctxt->depth > 1024)) {
        xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
        return(NULL);
    }

    /*
     * allocate a translation buffer.
     */
    buffer_size = XML_PARSER_BIG_BUFFER_SIZE;
    buffer = (xmlChar *) xmlMallocAtomic(buffer_size);
    if (buffer == NULL) goto mem_error;

    /*
     * OK loop until we reach one of the ending char or a size limit.
     * we are operating on already parsed values.
     */
    if (str < last)
        c = CUR_SCHAR(str, l);
    else
        c = 0;
    while ((c != 0) && (c != end) && /* non input consuming loop */
           (c != end2) && (c != end3) &&
           (ctxt->instate != XML_PARSER_EOF)) {

        if (c == 0) break;
        if ((c == '&') && (str[1] == '#')) {
            int val = xmlParseStringCharRef(ctxt, &str);
            if (val == 0)
                goto int_error;
            COPY_BUF(0,buffer,nbchars,val);
            if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
                growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
            }
        } else if ((c == '&') && (what & XML_SUBSTITUTE_REF)) {
            if (xmlParserDebugEntities)
                xmlGenericError(xmlGenericErrorContext,
                        "String decoding Entity Reference: %.30s\n",
                        str);
            ent = xmlParseStringEntityRef(ctxt, &str);
            xmlParserEntityCheck(ctxt, 0, ent, 0);
            if (ent != NULL)
                ctxt->nbentities += ent->checked / 2;
            if ((ent != NULL) &&
                (ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
                if (ent->content != NULL) {
                    COPY_BUF(0,buffer,nbchars,ent->content[0]);
                    if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
                        growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
                    }
                } else {
                    xmlFatalErrMsg(ctxt, XML_ERR_INTERNAL_ERROR,
                            "predefined entity has no content\n");
                    goto int_error;
                }
            } else if ((ent != NULL) && (ent->content != NULL)) {
                ctxt->depth++;
                rep = xmlStringDecodeEntities(ctxt, ent->content, what,
                                              0, 0, 0);
                ctxt->depth--;
                if (rep == NULL) {
                    ent->content[0] = 0;
                    goto int_error;
                }

                current = rep;
                while (*current != 0) { /* non input consuming loop */
                    buffer[nbchars++] = *current++;
                    if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
                        if (xmlParserEntityCheck(ctxt, nbchars, ent, 0))
                            goto int_error;
                        growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
                    }
                }
                xmlFree(rep);
                rep = NULL;
            } else if (ent != NULL) {
                int i = xmlStrlen(ent->name);
                const xmlChar *cur = ent->name;

                buffer[nbchars++] = '&';
                if (nbchars + i + XML_PARSER_BUFFER_SIZE > buffer_size) {
                    growBuffer(buffer, i + XML_PARSER_BUFFER_SIZE);
                }
                for (;i > 0;i--)
                    buffer[nbchars++] = *cur++;
                buffer[nbchars++] = ';';
            }
        } else if (c == '%' && (what & XML_SUBSTITUTE_PEREF)) {
            if (xmlParserDebugEntities)
                xmlGenericError(xmlGenericErrorContext,
                        "String decoding PE Reference: %.30s\n", str);
            ent = xmlParseStringPEReference(ctxt, &str);
            xmlParserEntityCheck(ctxt, 0, ent, 0);
            if (ent != NULL)
                ctxt->nbentities += ent->checked / 2;
            if (ent != NULL) {
                if (ent->content == NULL) {
                    /*
                     * Note: external parsed entities will not be loaded,
                     * it is not required for a non-validating parser to
                     * complete external PEReferences coming from the
                     * internal subset
                     */
                    if (((ctxt->options & XML_PARSE_NOENT) != 0) ||
                        ((ctxt->options & XML_PARSE_DTDVALID) != 0) ||
                        (ctxt->validate != 0)) {
                        xmlLoadEntityContent(ctxt, ent);
                    } else {
                        xmlWarningMsg(ctxt, XML_ERR_ENTITY_PROCESSING,
                  "not validating will not read content for PE entity %s\n",
                                      ent->name, NULL);
                    }
                }
                ctxt->depth++;
                rep = xmlStringDecodeEntities(ctxt, ent->content, what,
                                              0, 0, 0);
                ctxt->depth--;
                if (rep == NULL) {
                    if (ent->content != NULL)
                        ent->content[0] = 0;
                    goto int_error;
                }
                current = rep;
                while (*current != 0) { /* non input consuming loop */
                    buffer[nbchars++] = *current++;
                    if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
                        if (xmlParserEntityCheck(ctxt, nbchars, ent, 0))
                            goto int_error;
                        growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
                    }
                }
                xmlFree(rep);
                rep = NULL;
            }
        } else {
            COPY_BUF(l,buffer,nbchars,c);
            str += l;
            if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
                growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
            }
        }
        if (str < last)
            c = CUR_SCHAR(str, l);
        else
            c = 0;
    }
    buffer[nbchars] = 0;
    return(buffer);

mem_error:
    xmlErrMemory(ctxt, NULL);
int_error:
    if (rep != NULL)
        xmlFree(rep);
    if (buffer != NULL)
        xmlFree(buffer);
    return(NULL);
}

/**
 * xmlStringDecodeEntities:
 * @ctxt:  the parser context
 * @str:  the input string
 * @what:  combination of XML_SUBSTITUTE_REF and XML_SUBSTITUTE_PEREF
 * @end:  an end marker xmlChar, 0 if none
 * @end2:  an end marker xmlChar, 0 if none
 * @end3:  an end marker xmlChar, 0 if none
 *
 * Takes a entity string content and process to do the adequate substitutions.
 *
 * [67] Reference ::= EntityRef | CharRef
 *
 * [69] PEReference ::= '%' Name ';'
 *
 * Returns A newly allocated string with the substitution done. The caller
 *      must deallocate it !
 */
xmlChar *
xmlStringDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int what,
                        xmlChar end, xmlChar  end2, xmlChar end3) {
    if ((ctxt == NULL) || (str == NULL)) return(NULL);
    return(xmlStringLenDecodeEntities(ctxt, str, xmlStrlen(str), what,
           end, end2, end3));
}

/************************************************************************
 *                                                                      *
 *              Commodity functions, cleanup needed ?                   *
 *                                                                      *
 ************************************************************************/

/**
 * areBlanks:
 * @ctxt:  an XML parser context
 * @str:  a xmlChar *
 * @len:  the size of @str
 * @blank_chars: we know the chars are blanks
 *
 * Is this a sequence of blank chars that one can ignore ?
 *
 * Returns 1 if ignorable 0 otherwise.
 */

static int areBlanks(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
                     int blank_chars) {
    int i, ret;
    xmlNodePtr lastChild;

    /*
     * Don't spend time trying to differentiate them, the same callback is
     * used !
     */
    if (ctxt->sax->ignorableWhitespace == ctxt->sax->characters)
        return(0);

    /*
     * Check for xml:space value.
     */
    if ((ctxt->space == NULL) || (*(ctxt->space) == 1) ||
        (*(ctxt->space) == -2))
        return(0);

    /*
     * Check that the string is made of blanks
     */
    if (blank_chars == 0) {
        for (i = 0;i < len;i++)
            if (!(IS_BLANK_CH(str[i]))) return(0);
    }

    /*
     * Look if the element is mixed content in the DTD if available
     */
    if (ctxt->node == NULL) return(0);
    if (ctxt->myDoc != NULL) {
        ret = xmlIsMixedElement(ctxt->myDoc, ctxt->node->name);
        if (ret == 0) return(1);
        if (ret == 1) return(0);
    }

    /*
     * Otherwise, heuristic :-\
     */
    if ((RAW != '<') && (RAW != 0xD)) return(0);
    if ((ctxt->node->children == NULL) &&
        (RAW == '<') && (NXT(1) == '/')) return(0);

    lastChild = xmlGetLastChild(ctxt->node);
    if (lastChild == NULL) {
        if ((ctxt->node->type != XML_ELEMENT_NODE) &&
            (ctxt->node->content != NULL)) return(0);
    } else if (xmlNodeIsText(lastChild))
        return(0);
    else if ((ctxt->node->children != NULL) &&
             (xmlNodeIsText(ctxt->node->children)))
        return(0);
    return(1);
}

/************************************************************************
 *                                                                      *
 *              Extra stuff for namespace support                       *
 *      Relates to http://www.w3.org/TR/WD-xml-names                    *
 *                                                                      *
 ************************************************************************/

/**
 * xmlSplitQName:
 * @ctxt:  an XML parser context
 * @name:  an XML parser context
 * @prefix:  a xmlChar **
 *
 * parse an UTF8 encoded XML qualified name string
 *
 * [NS 5] QName ::= (Prefix ':')? LocalPart
 *
 * [NS 6] Prefix ::= NCName
 *
 * [NS 7] LocalPart ::= NCName
 *
 * Returns the local part, and prefix is updated
 *   to get the Prefix if any.
 */

xmlChar *
xmlSplitQName(xmlParserCtxtPtr ctxt, const xmlChar *name, xmlChar **prefix) {
    xmlChar buf[XML_MAX_NAMELEN + 5];
    xmlChar *buffer = NULL;
    int len = 0;
    int max = XML_MAX_NAMELEN;
    xmlChar *ret = NULL;
    const xmlChar *cur = name;
    int c;

    if (prefix == NULL) return(NULL);
    *prefix = NULL;

    if (cur == NULL) return(NULL);

#ifndef XML_XML_NAMESPACE
    /* xml: prefix is not really a namespace */
    if ((cur[0] == 'x') && (cur[1] == 'm') &&
        (cur[2] == 'l') && (cur[3] == ':'))
        return(xmlStrdup(name));
#endif

    /* nasty but well=formed */
    if (cur[0] == ':')
        return(xmlStrdup(name));

    c = *cur++;
    while ((c != 0) && (c != ':') && (len < max)) { /* tested bigname.xml */
        buf[len++] = c;
        c = *cur++;
    }
    if (len >= max) {
        /*
         * Okay someone managed to make a huge name, so he's ready to pay
         * for the processing speed.
         */
        max = len * 2;

        buffer = (xmlChar *) xmlMallocAtomic(max * sizeof(xmlChar));
        if (buffer == NULL) {
            xmlErrMemory(ctxt, NULL);
            return(NULL);
        }
        memcpy(buffer, buf, len);
        while ((c != 0) && (c != ':')) { /* tested bigname.xml */
            if (len + 10 > max) {
                xmlChar *tmp;

                max *= 2;
                tmp = (xmlChar *) xmlRealloc(buffer,
                                                max * sizeof(xmlChar));
                if (tmp == NULL) {
                    xmlFree(buffer);
                    xmlErrMemory(ctxt, NULL);
                    return(NULL);
                }
                buffer = tmp;
            }
            buffer[len++] = c;
            c = *cur++;
        }
        buffer[len] = 0;
    }

    if ((c == ':') && (*cur == 0)) {
        if (buffer != NULL)
            xmlFree(buffer);
        *prefix = NULL;
        return(xmlStrdup(name));
    }

    if (buffer == NULL)
        ret = xmlStrndup(buf, len);
    else {
        ret = buffer;
        buffer = NULL;
        max = XML_MAX_NAMELEN;
    }


    if (c == ':') {
        c = *cur;
        *prefix = ret;
        if (c == 0) {
            return(xmlStrndup(BAD_CAST "", 0));
        }
        len = 0;

        /*
         * Check that the first character is proper to start
         * a new name
         */
        if (!(((c >= 0x61) && (c <= 0x7A)) ||
              ((c >= 0x41) && (c <= 0x5A)) ||
              (c == '_') || (c == ':'))) {
            int l;
            int first = CUR_SCHAR(cur, l);

            if (!IS_LETTER(first) && (first != '_')) {
                xmlFatalErrMsgStr(ctxt, XML_NS_ERR_QNAME,
                            "Name %s is not XML Namespace compliant\n",
                                  name);
            }
        }
        cur++;

        while ((c != 0) && (len < max)) { /* tested bigname2.xml */
            buf[len++] = c;
            c = *cur++;
        }
        if (len >= max) {
            /*
             * Okay someone managed to make a huge name, so he's ready to pay
             * for the processing speed.
             */
            max = len * 2;

            buffer = (xmlChar *) xmlMallocAtomic(max * sizeof(xmlChar));
            if (buffer == NULL) {
                xmlErrMemory(ctxt, NULL);
                return(NULL);
            }
            memcpy(buffer, buf, len);
            while (c != 0) { /* tested bigname2.xml */
                if (len + 10 > max) {
                    xmlChar *tmp;

                    max *= 2;
                    tmp = (xmlChar *) xmlRealloc(buffer,
                                                    max * sizeof(xmlChar));
                    if (tmp == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        xmlFree(buffer);
                        return(NULL);
                    }
                    buffer = tmp;
                }
                buffer[len++] = c;
                c = *cur++;
            }
            buffer[len] = 0;
        }

        if (buffer == NULL)
            ret = xmlStrndup(buf, len);
        else {
            ret = buffer;
        }
    }

    return(ret);
}

/************************************************************************
 *                                                                      *
 *                      The parser itself                               *
 *      Relates to http://www.w3.org/TR/REC-xml                         *
 *                                                                      *
 ************************************************************************/

/************************************************************************
 *                                                                      *
 *      Routines to parse Name, NCName and NmToken                      *
 *                                                                      *
 ************************************************************************/
#ifdef DEBUG
static unsigned long nbParseName = 0;
static unsigned long nbParseNmToken = 0;
static unsigned long nbParseNCName = 0;
static unsigned long nbParseNCNameComplex = 0;
static unsigned long nbParseNameComplex = 0;
static unsigned long nbParseStringName = 0;
#endif

/*
 * The two following functions are related to the change of accepted
 * characters for Name and NmToken in the Revision 5 of XML-1.0
 * They correspond to the modified production [4] and the new production [4a]
 * changes in that revision. Also note that the macros used for the
 * productions Letter, Digit, CombiningChar and Extender are not needed
 * anymore.
 * We still keep compatibility to pre-revision5 parsing semantic if the
 * new XML_PARSE_OLD10 option is given to the parser.
 */
static int
xmlIsNameStartChar(xmlParserCtxtPtr ctxt, int c) {
    if ((ctxt->options & XML_PARSE_OLD10) == 0) {
        /*
         * Use the new checks of production [4] [4a] amd [5] of the
         * Update 5 of XML-1.0
         */
        if ((c != ' ') && (c != '>') && (c != '/') && /* accelerators */
            (((c >= 'a') && (c <= 'z')) ||
             ((c >= 'A') && (c <= 'Z')) ||
             (c == '_') || (c == ':') ||
             ((c >= 0xC0) && (c <= 0xD6)) ||
             ((c >= 0xD8) && (c <= 0xF6)) ||
             ((c >= 0xF8) && (c <= 0x2FF)) ||
             ((c >= 0x370) && (c <= 0x37D)) ||
             ((c >= 0x37F) && (c <= 0x1FFF)) ||
             ((c >= 0x200C) && (c <= 0x200D)) ||
             ((c >= 0x2070) && (c <= 0x218F)) ||
             ((c >= 0x2C00) && (c <= 0x2FEF)) ||
             ((c >= 0x3001) && (c <= 0xD7FF)) ||
             ((c >= 0xF900) && (c <= 0xFDCF)) ||
             ((c >= 0xFDF0) && (c <= 0xFFFD)) ||
             ((c >= 0x10000) && (c <= 0xEFFFF))))
            return(1);
    } else {
        if (IS_LETTER(c) || (c == '_') || (c == ':'))
            return(1);
    }
    return(0);
}

static int
xmlIsNameChar(xmlParserCtxtPtr ctxt, int c) {
    if ((ctxt->options & XML_PARSE_OLD10) == 0) {
        /*
         * Use the new checks of production [4] [4a] amd [5] of the
         * Update 5 of XML-1.0
         */
        if ((c != ' ') && (c != '>') && (c != '/') && /* accelerators */
            (((c >= 'a') && (c <= 'z')) ||
             ((c >= 'A') && (c <= 'Z')) ||
             ((c >= '0') && (c <= '9')) || /* !start */
             (c == '_') || (c == ':') ||
             (c == '-') || (c == '.') || (c == 0xB7) || /* !start */
             ((c >= 0xC0) && (c <= 0xD6)) ||
             ((c >= 0xD8) && (c <= 0xF6)) ||
             ((c >= 0xF8) && (c <= 0x2FF)) ||
             ((c >= 0x300) && (c <= 0x36F)) || /* !start */
             ((c >= 0x370) && (c <= 0x37D)) ||
             ((c >= 0x37F) && (c <= 0x1FFF)) ||
             ((c >= 0x200C) && (c <= 0x200D)) ||
             ((c >= 0x203F) && (c <= 0x2040)) || /* !start */
             ((c >= 0x2070) && (c <= 0x218F)) ||
             ((c >= 0x2C00) && (c <= 0x2FEF)) ||
             ((c >= 0x3001) && (c <= 0xD7FF)) ||
             ((c >= 0xF900) && (c <= 0xFDCF)) ||
             ((c >= 0xFDF0) && (c <= 0xFFFD)) ||
             ((c >= 0x10000) && (c <= 0xEFFFF))))
             return(1);
    } else {
        if ((IS_LETTER(c)) || (IS_DIGIT(c)) ||
            (c == '.') || (c == '-') ||
            (c == '_') || (c == ':') ||
            (IS_COMBINING(c)) ||
            (IS_EXTENDER(c)))
            return(1);
    }
    return(0);
}

static xmlChar * xmlParseAttValueInternal(xmlParserCtxtPtr ctxt,
                                          int *len, int *alloc, int normalize);

static const xmlChar *
xmlParseNameComplex(xmlParserCtxtPtr ctxt) {
    int len = 0, l;
    int c;
    int count = 0;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_TEXT_LENGTH :
                    XML_MAX_NAME_LENGTH;

#ifdef DEBUG
    nbParseNameComplex++;
#endif

    /*
     * Handler for more complex cases
     */
    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        return(NULL);
    c = CUR_CHAR(l);
    if ((ctxt->options & XML_PARSE_OLD10) == 0) {
        /*
         * Use the new checks of production [4] [4a] amd [5] of the
         * Update 5 of XML-1.0
         */
        if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */
            (!(((c >= 'a') && (c <= 'z')) ||
               ((c >= 'A') && (c <= 'Z')) ||
               (c == '_') || (c == ':') ||
               ((c >= 0xC0) && (c <= 0xD6)) ||
               ((c >= 0xD8) && (c <= 0xF6)) ||
               ((c >= 0xF8) && (c <= 0x2FF)) ||
               ((c >= 0x370) && (c <= 0x37D)) ||
               ((c >= 0x37F) && (c <= 0x1FFF)) ||
               ((c >= 0x200C) && (c <= 0x200D)) ||
               ((c >= 0x2070) && (c <= 0x218F)) ||
               ((c >= 0x2C00) && (c <= 0x2FEF)) ||
               ((c >= 0x3001) && (c <= 0xD7FF)) ||
               ((c >= 0xF900) && (c <= 0xFDCF)) ||
               ((c >= 0xFDF0) && (c <= 0xFFFD)) ||
               ((c >= 0x10000) && (c <= 0xEFFFF))))) {
            return(NULL);
        }
        len += l;
        NEXTL(l);
        c = CUR_CHAR(l);
        while ((c != ' ') && (c != '>') && (c != '/') && /* accelerators */
               (((c >= 'a') && (c <= 'z')) ||
                ((c >= 'A') && (c <= 'Z')) ||
                ((c >= '0') && (c <= '9')) || /* !start */
                (c == '_') || (c == ':') ||
                (c == '-') || (c == '.') || (c == 0xB7) || /* !start */
                ((c >= 0xC0) && (c <= 0xD6)) ||
                ((c >= 0xD8) && (c <= 0xF6)) ||
                ((c >= 0xF8) && (c <= 0x2FF)) ||
                ((c >= 0x300) && (c <= 0x36F)) || /* !start */
                ((c >= 0x370) && (c <= 0x37D)) ||
                ((c >= 0x37F) && (c <= 0x1FFF)) ||
                ((c >= 0x200C) && (c <= 0x200D)) ||
                ((c >= 0x203F) && (c <= 0x2040)) || /* !start */
                ((c >= 0x2070) && (c <= 0x218F)) ||
                ((c >= 0x2C00) && (c <= 0x2FEF)) ||
                ((c >= 0x3001) && (c <= 0xD7FF)) ||
                ((c >= 0xF900) && (c <= 0xFDCF)) ||
                ((c >= 0xFDF0) && (c <= 0xFFFD)) ||
                ((c >= 0x10000) && (c <= 0xEFFFF))
                )) {
            if (count++ > XML_PARSER_CHUNK_SIZE) {
                count = 0;
                GROW;
                if (ctxt->instate == XML_PARSER_EOF)
                    return(NULL);
            }
            if (len <= INT_MAX - l)
                len += l;
            NEXTL(l);
            c = CUR_CHAR(l);
        }
    } else {
        if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */
            (!IS_LETTER(c) && (c != '_') &&
             (c != ':'))) {
            return(NULL);
        }
        len += l;
        NEXTL(l);
        c = CUR_CHAR(l);

        while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */
               ((IS_LETTER(c)) || (IS_DIGIT(c)) ||
                (c == '.') || (c == '-') ||
                (c == '_') || (c == ':') ||
                (IS_COMBINING(c)) ||
                (IS_EXTENDER(c)))) {
            if (count++ > XML_PARSER_CHUNK_SIZE) {
                count = 0;
                GROW;
                if (ctxt->instate == XML_PARSER_EOF)
                    return(NULL);
            }
            if (len <= INT_MAX - l)
                len += l;
            NEXTL(l);
            c = CUR_CHAR(l);
        }
    }
    if (len > maxLength) {
        xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Name");
        return(NULL);
    }
    if (ctxt->input->cur - ctxt->input->base < len) {
        /*
         * There were a couple of bugs where PERefs lead to to a change
         * of the buffer. Check the buffer size to avoid passing an invalid
         * pointer to xmlDictLookup.
         */
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                    "unexpected change of input buffer");
        return (NULL);
    }
    if ((*ctxt->input->cur == '\n') && (ctxt->input->cur[-1] == '\r'))
        return(xmlDictLookup(ctxt->dict, ctxt->input->cur - (len + 1), len));
    return(xmlDictLookup(ctxt->dict, ctxt->input->cur - len, len));
}

/**
 * xmlParseName:
 * @ctxt:  an XML parser context
 *
 * parse an XML name.
 *
 * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' |
 *                  CombiningChar | Extender
 *
 * [5] Name ::= (Letter | '_' | ':') (NameChar)*
 *
 * [6] Names ::= Name (#x20 Name)*
 *
 * Returns the Name parsed or NULL
 */

const xmlChar *
xmlParseName(xmlParserCtxtPtr ctxt) {
    const xmlChar *in;
    const xmlChar *ret;
    size_t count = 0;
    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                       XML_MAX_TEXT_LENGTH :
                       XML_MAX_NAME_LENGTH;

    GROW;

#ifdef DEBUG
    nbParseName++;
#endif

    /*
     * Accelerator for simple ASCII names
     */
    in = ctxt->input->cur;
    if (((*in >= 0x61) && (*in <= 0x7A)) ||
        ((*in >= 0x41) && (*in <= 0x5A)) ||
        (*in == '_') || (*in == ':')) {
        in++;
        while (((*in >= 0x61) && (*in <= 0x7A)) ||
               ((*in >= 0x41) && (*in <= 0x5A)) ||
               ((*in >= 0x30) && (*in <= 0x39)) ||
               (*in == '_') || (*in == '-') ||
               (*in == ':') || (*in == '.'))
            in++;
        if ((*in > 0) && (*in < 0x80)) {
            count = in - ctxt->input->cur;
            if (count > maxLength) {
                xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Name");
                return(NULL);
            }
            ret = xmlDictLookup(ctxt->dict, ctxt->input->cur, count);
            ctxt->input->cur = in;
            ctxt->input->col += count;
            if (ret == NULL)
                xmlErrMemory(ctxt, NULL);
            return(ret);
        }
    }
    /* accelerator for special cases */
    return(xmlParseNameComplex(ctxt));
}

static const xmlChar *
xmlParseNCNameComplex(xmlParserCtxtPtr ctxt) {
    int len = 0, l;
    int c;
    int count = 0;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_TEXT_LENGTH :
                    XML_MAX_NAME_LENGTH;
    size_t startPosition = 0;

#ifdef DEBUG
    nbParseNCNameComplex++;
#endif

    /*
     * Handler for more complex cases
     */
    GROW;
    startPosition = CUR_PTR - BASE_PTR;
    c = CUR_CHAR(l);
    if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */
        (!xmlIsNameStartChar(ctxt, c) || (c == ':'))) {
        return(NULL);
    }

    while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */
           (xmlIsNameChar(ctxt, c) && (c != ':'))) {
        if (count++ > XML_PARSER_CHUNK_SIZE) {
            count = 0;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF)
                return(NULL);
        }
        if (len <= INT_MAX - l)
            len += l;
        NEXTL(l);
        c = CUR_CHAR(l);
        if (c == 0) {
            count = 0;
            /*
             * when shrinking to extend the buffer we really need to preserve
             * the part of the name we already parsed. Hence rolling back
             * by current length.
             */
            ctxt->input->cur -= l;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF)
                return(NULL);
            ctxt->input->cur += l;
            c = CUR_CHAR(l);
        }
    }
    if (len > maxLength) {
        xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
        return(NULL);
    }
    return(xmlDictLookup(ctxt->dict, (BASE_PTR + startPosition), len));
}

/**
 * xmlParseNCName:
 * @ctxt:  an XML parser context
 * @len:  length of the string parsed
 *
 * parse an XML name.
 *
 * [4NS] NCNameChar ::= Letter | Digit | '.' | '-' | '_' |
 *                      CombiningChar | Extender
 *
 * [5NS] NCName ::= (Letter | '_') (NCNameChar)*
 *
 * Returns the Name parsed or NULL
 */

static const xmlChar *
xmlParseNCName(xmlParserCtxtPtr ctxt) {
    const xmlChar *in, *e;
    const xmlChar *ret;
    size_t count = 0;
    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                       XML_MAX_TEXT_LENGTH :
                       XML_MAX_NAME_LENGTH;

#ifdef DEBUG
    nbParseNCName++;
#endif

    /*
     * Accelerator for simple ASCII names
     */
    in = ctxt->input->cur;
    e = ctxt->input->end;
    if ((((*in >= 0x61) && (*in <= 0x7A)) ||
         ((*in >= 0x41) && (*in <= 0x5A)) ||
         (*in == '_')) && (in < e)) {
        in++;
        while ((((*in >= 0x61) && (*in <= 0x7A)) ||
                ((*in >= 0x41) && (*in <= 0x5A)) ||
                ((*in >= 0x30) && (*in <= 0x39)) ||
                (*in == '_') || (*in == '-') ||
                (*in == '.')) && (in < e))
            in++;
        if (in >= e)
            goto complex;
        if ((*in > 0) && (*in < 0x80)) {
            count = in - ctxt->input->cur;
            if (count > maxLength) {
                xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
                return(NULL);
            }
            ret = xmlDictLookup(ctxt->dict, ctxt->input->cur, count);
            ctxt->input->cur = in;
            ctxt->input->col += count;
            if (ret == NULL) {
                xmlErrMemory(ctxt, NULL);
            }
            return(ret);
        }
    }
complex:
    return(xmlParseNCNameComplex(ctxt));
}

/**
 * xmlParseNameAndCompare:
 * @ctxt:  an XML parser context
 *
 * parse an XML name and compares for match
 * (specialized for endtag parsing)
 *
 * Returns NULL for an illegal name, (xmlChar*) 1 for success
 * and the name for mismatch
 */

static const xmlChar *
xmlParseNameAndCompare(xmlParserCtxtPtr ctxt, xmlChar const *other) {
    register const xmlChar *cmp = other;
    register const xmlChar *in;
    const xmlChar *ret;

    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        return(NULL);

    in = ctxt->input->cur;
    while (*in != 0 && *in == *cmp) {
        ++in;
        ++cmp;
    }
    if (*cmp == 0 && (*in == '>' || IS_BLANK_CH (*in))) {
        /* success */
        ctxt->input->col += in - ctxt->input->cur;
        ctxt->input->cur = in;
        return (const xmlChar*) 1;
    }
    /* failure (or end of input buffer), check with full function */
    ret = xmlParseName (ctxt);
    /* strings coming from the dictionary direct compare possible */
    if (ret == other) {
        return (const xmlChar*) 1;
    }
    return ret;
}

/**
 * xmlParseStringName:
 * @ctxt:  an XML parser context
 * @str:  a pointer to the string pointer (IN/OUT)
 *
 * parse an XML name.
 *
 * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' |
 *                  CombiningChar | Extender
 *
 * [5] Name ::= (Letter | '_' | ':') (NameChar)*
 *
 * [6] Names ::= Name (#x20 Name)*
 *
 * Returns the Name parsed or NULL. The @str pointer
 * is updated to the current location in the string.
 */

static xmlChar *
xmlParseStringName(xmlParserCtxtPtr ctxt, const xmlChar** str) {
    xmlChar buf[XML_MAX_NAMELEN + 5];
    const xmlChar *cur = *str;
    int len = 0, l;
    int c;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_TEXT_LENGTH :
                    XML_MAX_NAME_LENGTH;

#ifdef DEBUG
    nbParseStringName++;
#endif

    c = CUR_SCHAR(cur, l);
    if (!xmlIsNameStartChar(ctxt, c)) {
        return(NULL);
    }

    COPY_BUF(l,buf,len,c);
    cur += l;
    c = CUR_SCHAR(cur, l);
    while (xmlIsNameChar(ctxt, c)) {
        COPY_BUF(l,buf,len,c);
        cur += l;
        c = CUR_SCHAR(cur, l);
        if (len >= XML_MAX_NAMELEN) { /* test bigentname.xml */
            /*
             * Okay someone managed to make a huge name, so he's ready to pay
             * for the processing speed.
             */
            xmlChar *buffer;
            int max = len * 2;

            buffer = (xmlChar *) xmlMallocAtomic(max * sizeof(xmlChar));
            if (buffer == NULL) {
                xmlErrMemory(ctxt, NULL);
                return(NULL);
            }
            memcpy(buffer, buf, len);
            while (xmlIsNameChar(ctxt, c)) {
                if (len + 10 > max) {
                    xmlChar *tmp;

                    max *= 2;
                    tmp = (xmlChar *) xmlRealloc(buffer,
                                                    max * sizeof(xmlChar));
                    if (tmp == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        xmlFree(buffer);
                        return(NULL);
                    }
                    buffer = tmp;
                }
                COPY_BUF(l,buffer,len,c);
                cur += l;
                c = CUR_SCHAR(cur, l);
                if (len > maxLength) {
                    xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
                    xmlFree(buffer);
                    return(NULL);
                }
            }
            buffer[len] = 0;
            *str = cur;
            return(buffer);
        }
    }
    if (len > maxLength) {
        xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NCName");
        return(NULL);
    }
    *str = cur;
    return(xmlStrndup(buf, len));
}

/**
 * xmlParseNmtoken:
 * @ctxt:  an XML parser context
 *
 * parse an XML Nmtoken.
 *
 * [7] Nmtoken ::= (NameChar)+
 *
 * [8] Nmtokens ::= Nmtoken (#x20 Nmtoken)*
 *
 * Returns the Nmtoken parsed or NULL
 */

xmlChar *
xmlParseNmtoken(xmlParserCtxtPtr ctxt) {
    xmlChar buf[XML_MAX_NAMELEN + 5];
    int len = 0, l;
    int c;
    int count = 0;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_TEXT_LENGTH :
                    XML_MAX_NAME_LENGTH;

#ifdef DEBUG
    nbParseNmToken++;
#endif

    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        return(NULL);
    c = CUR_CHAR(l);

    while (xmlIsNameChar(ctxt, c)) {
        if (count++ > XML_PARSER_CHUNK_SIZE) {
            count = 0;
            GROW;
        }
        COPY_BUF(l,buf,len,c);
        NEXTL(l);
        c = CUR_CHAR(l);
        if (c == 0) {
            count = 0;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF)
                return(NULL);
            c = CUR_CHAR(l);
        }
        if (len >= XML_MAX_NAMELEN) {
            /*
             * Okay someone managed to make a huge token, so he's ready to pay
             * for the processing speed.
             */
            xmlChar *buffer;
            int max = len * 2;

            buffer = (xmlChar *) xmlMallocAtomic(max * sizeof(xmlChar));
            if (buffer == NULL) {
                xmlErrMemory(ctxt, NULL);
                return(NULL);
            }
            memcpy(buffer, buf, len);
            while (xmlIsNameChar(ctxt, c)) {
                if (count++ > XML_PARSER_CHUNK_SIZE) {
                    count = 0;
                    GROW;
                    if (ctxt->instate == XML_PARSER_EOF) {
                        xmlFree(buffer);
                        return(NULL);
                    }
                }
                if (len + 10 > max) {
                    xmlChar *tmp;

                    max *= 2;
                    tmp = (xmlChar *) xmlRealloc(buffer,
                                                    max * sizeof(xmlChar));
                    if (tmp == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        xmlFree(buffer);
                        return(NULL);
                    }
                    buffer = tmp;
                }
                COPY_BUF(l,buffer,len,c);
                NEXTL(l);
                c = CUR_CHAR(l);
                if (len > maxLength) {
                    xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken");
                    xmlFree(buffer);
                    return(NULL);
                }
            }
            buffer[len] = 0;
            return(buffer);
        }
    }
    if (len == 0)
        return(NULL);
    if (len > maxLength) {
        xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "NmToken");
        return(NULL);
    }
    return(xmlStrndup(buf, len));
}

/**
 * xmlParseEntityValue:
 * @ctxt:  an XML parser context
 * @orig:  if non-NULL store a copy of the original entity value
 *
 * parse a value for ENTITY declarations
 *
 * [9] EntityValue ::= '"' ([^%&"] | PEReference | Reference)* '"' |
 *                     "'" ([^%&'] | PEReference | Reference)* "'"
 *
 * Returns the EntityValue parsed with reference substituted or NULL
 */

xmlChar *
xmlParseEntityValue(xmlParserCtxtPtr ctxt, xmlChar **orig) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = XML_PARSER_BUFFER_SIZE;
    int c, l;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_HUGE_LENGTH :
                    XML_MAX_TEXT_LENGTH;
    xmlChar stop;
    xmlChar *ret = NULL;
    const xmlChar *cur = NULL;
    xmlParserInputPtr input;

    if (RAW == '"') stop = '"';
    else if (RAW == '\'') stop = '\'';
    else {
        xmlFatalErr(ctxt, XML_ERR_ENTITY_NOT_STARTED, NULL);
        return(NULL);
    }
    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
    if (buf == NULL) {
        xmlErrMemory(ctxt, NULL);
        return(NULL);
    }

    /*
     * The content of the entity definition is copied in a buffer.
     */

    ctxt->instate = XML_PARSER_ENTITY_VALUE;
    input = ctxt->input;
    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        goto error;
    NEXT;
    c = CUR_CHAR(l);
    /*
     * NOTE: 4.4.5 Included in Literal
     * When a parameter entity reference appears in a literal entity
     * value, ... a single or double quote character in the replacement
     * text is always treated as a normal data character and will not
     * terminate the literal.
     * In practice it means we stop the loop only when back at parsing
     * the initial entity and the quote is found
     */
    while (((IS_CHAR(c)) && ((c != stop) || /* checked */
            (ctxt->input != input))) && (ctxt->instate != XML_PARSER_EOF)) {
        if (len + 5 >= size) {
            xmlChar *tmp;

            size *= 2;
            tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
            if (tmp == NULL) {
                xmlErrMemory(ctxt, NULL);
                goto error;
            }
            buf = tmp;
        }
        COPY_BUF(l,buf,len,c);
        NEXTL(l);

        GROW;
        c = CUR_CHAR(l);
        if (c == 0) {
            GROW;
            c = CUR_CHAR(l);
        }

        if (len > maxLength) {
            xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_NOT_FINISHED,
                           "entity value too long\n");
            goto error;
        }
    }
    buf[len] = 0;
    if (ctxt->instate == XML_PARSER_EOF)
        goto error;
    if (c != stop) {
        xmlFatalErr(ctxt, XML_ERR_ENTITY_NOT_FINISHED, NULL);
        goto error;
    }
    NEXT;

    /*
     * Raise problem w.r.t. '&' and '%' being used in non-entities
     * reference constructs. Note Charref will be handled in
     * xmlStringDecodeEntities()
     */
    cur = buf;
    while (*cur != 0) { /* non input consuming */
        if ((*cur == '%') || ((*cur == '&') && (cur[1] != '#'))) {
            xmlChar *name;
            xmlChar tmp = *cur;
            int nameOk = 0;

            cur++;
            name = xmlParseStringName(ctxt, &cur);
            if (name != NULL) {
                nameOk = 1;
                xmlFree(name);
            }
            if ((nameOk == 0) || (*cur != ';')) {
                xmlFatalErrMsgInt(ctxt, XML_ERR_ENTITY_CHAR_ERROR,
            "EntityValue: '%c' forbidden except for entities references\n",
                                  tmp);
                goto error;
            }
            if ((tmp == '%') && (ctxt->inSubset == 1) &&
                (ctxt->inputNr == 1)) {
                xmlFatalErr(ctxt, XML_ERR_ENTITY_PE_INTERNAL, NULL);
                goto error;
            }
            if (*cur == 0)
                break;
        }
        cur++;
    }

    /*
     * Then PEReference entities are substituted.
     *
     * NOTE: 4.4.7 Bypassed
     * When a general entity reference appears in the EntityValue in
     * an entity declaration, it is bypassed and left as is.
     * so XML_SUBSTITUTE_REF is not set here.
     */
    ++ctxt->depth;
    ret = xmlStringDecodeEntities(ctxt, buf, XML_SUBSTITUTE_PEREF,
                                  0, 0, 0);
    --ctxt->depth;
    if (orig != NULL) {
        *orig = buf;
        buf = NULL;
    }

error:
    if (buf != NULL)
        xmlFree(buf);
    return(ret);
}

/**
 * xmlParseAttValueComplex:
 * @ctxt:  an XML parser context
 * @len:   the resulting attribute len
 * @normalize:  whether to apply the inner normalization
 *
 * parse a value for an attribute, this is the fallback function
 * of xmlParseAttValue() when the attribute parsing requires handling
 * of non-ASCII characters, or normalization compaction.
 *
 * Returns the AttValue parsed or NULL. The value has to be freed by the caller.
 */
static xmlChar *
xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
    xmlChar limit = 0;
    xmlChar *buf = NULL;
    xmlChar *rep = NULL;
    size_t len = 0;
    size_t buf_size = 0;
    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                       XML_MAX_HUGE_LENGTH :
                       XML_MAX_TEXT_LENGTH;
    int c, l, in_space = 0;
    xmlChar *current = NULL;
    xmlEntityPtr ent;

    if (NXT(0) == '"') {
        ctxt->instate = XML_PARSER_ATTRIBUTE_VALUE;
        limit = '"';
        NEXT;
    } else if (NXT(0) == '\'') {
        limit = '\'';
        ctxt->instate = XML_PARSER_ATTRIBUTE_VALUE;
        NEXT;
    } else {
        xmlFatalErr(ctxt, XML_ERR_ATTRIBUTE_NOT_STARTED, NULL);
        return(NULL);
    }

    /*
     * allocate a translation buffer.
     */
    buf_size = XML_PARSER_BUFFER_SIZE;
    buf = (xmlChar *) xmlMallocAtomic(buf_size);
    if (buf == NULL) goto mem_error;

    /*
     * OK loop until we reach one of the ending char or a size limit.
     */
    c = CUR_CHAR(l);
    while (((NXT(0) != limit) && /* checked */
            (IS_CHAR(c)) && (c != '<')) &&
            (ctxt->instate != XML_PARSER_EOF)) {
        if (c == '&') {
            in_space = 0;
            if (NXT(1) == '#') {
                int val = xmlParseCharRef(ctxt);

                if (val == '&') {
                    if (ctxt->replaceEntities) {
                        if (len + 10 > buf_size) {
                            growBuffer(buf, 10);
                        }
                        buf[len++] = '&';
                    } else {
                        /*
                         * The reparsing will be done in xmlStringGetNodeList()
                         * called by the attribute() function in SAX.c
                         */
                        if (len + 10 > buf_size) {
                            growBuffer(buf, 10);
                        }
                        buf[len++] = '&';
                        buf[len++] = '#';
                        buf[len++] = '3';
                        buf[len++] = '8';
                        buf[len++] = ';';
                    }
                } else if (val != 0) {
                    if (len + 10 > buf_size) {
                        growBuffer(buf, 10);
                    }
                    len += xmlCopyChar(0, &buf[len], val);
                }
            } else {
                ent = xmlParseEntityRef(ctxt);
                ctxt->nbentities++;
                if (ent != NULL)
                    ctxt->nbentities += ent->owner;
                if ((ent != NULL) &&
                    (ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
                    if (len + 10 > buf_size) {
                        growBuffer(buf, 10);
                    }
                    if ((ctxt->replaceEntities == 0) &&
                        (ent->content[0] == '&')) {
                        buf[len++] = '&';
                        buf[len++] = '#';
                        buf[len++] = '3';
                        buf[len++] = '8';
                        buf[len++] = ';';
                    } else {
                        buf[len++] = ent->content[0];
                    }
                } else if ((ent != NULL) &&
                           (ctxt->replaceEntities != 0)) {
                    if (ent->etype != XML_INTERNAL_PREDEFINED_ENTITY) {
                        ++ctxt->depth;
                        rep = xmlStringDecodeEntities(ctxt, ent->content,
                                                      XML_SUBSTITUTE_REF,
                                                      0, 0, 0);
                        --ctxt->depth;
                        if (rep != NULL) {
                            current = rep;
                            while (*current != 0) { /* non input consuming */
                                if ((*current == 0xD) || (*current == 0xA) ||
                                    (*current == 0x9)) {
                                    buf[len++] = 0x20;
                                    current++;
                                } else
                                    buf[len++] = *current++;
                                if (len + 10 > buf_size) {
                                    growBuffer(buf, 10);
                                }
                            }
                            xmlFree(rep);
                            rep = NULL;
                        }
                    } else {
                        if (len + 10 > buf_size) {
                            growBuffer(buf, 10);
                        }
                        if (ent->content != NULL)
                            buf[len++] = ent->content[0];
                    }
                } else if (ent != NULL) {
                    int i = xmlStrlen(ent->name);
                    const xmlChar *cur = ent->name;

                    /*
                     * This may look absurd but is needed to detect
                     * entities problems
                     */
                    if ((ent->etype != XML_INTERNAL_PREDEFINED_ENTITY) &&
                        (ent->content != NULL) && (ent->checked == 0)) {
                        unsigned long oldnbent = ctxt->nbentities, diff;

                        ++ctxt->depth;
                        rep = xmlStringDecodeEntities(ctxt, ent->content,
                                                  XML_SUBSTITUTE_REF, 0, 0, 0);
                        --ctxt->depth;

                        diff = ctxt->nbentities - oldnbent + 1;
                        if (diff > INT_MAX / 2)
                            diff = INT_MAX / 2;
                        ent->checked = diff * 2;
                        if (rep != NULL) {
                            if (xmlStrchr(rep, '<'))
                                ent->checked |= 1;
                            xmlFree(rep);
                            rep = NULL;
                        } else {
                            ent->content[0] = 0;
                        }
                    }

                    /*
                     * Just output the reference
                     */
                    buf[len++] = '&';
                    while (len + i + 10 > buf_size) {
                        growBuffer(buf, i + 10);
                    }
                    for (;i > 0;i--)
                        buf[len++] = *cur++;
                    buf[len++] = ';';
                }
            }
        } else {
            if ((c == 0x20) || (c == 0xD) || (c == 0xA) || (c == 0x9)) {
                if ((len != 0) || (!normalize)) {
                    if ((!normalize) || (!in_space)) {
                        COPY_BUF(l,buf,len,0x20);
                        while (len + 10 > buf_size) {
                            growBuffer(buf, 10);
                        }
                    }
                    in_space = 1;
                }
            } else {
                in_space = 0;
                COPY_BUF(l,buf,len,c);
                if (len + 10 > buf_size) {
                    growBuffer(buf, 10);
                }
            }
            NEXTL(l);
        }
        GROW;
        c = CUR_CHAR(l);
        if (len > maxLength) {
            xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                           "AttValue length too long\n");
            goto mem_error;
        }
    }
    if (ctxt->instate == XML_PARSER_EOF)
        goto error;

    if ((in_space) && (normalize)) {
        while ((len > 0) && (buf[len - 1] == 0x20)) len--;
    }
    buf[len] = 0;
    if (RAW == '<') {
        xmlFatalErr(ctxt, XML_ERR_LT_IN_ATTRIBUTE, NULL);
    } else if (RAW != limit) {
        if ((c != 0) && (!IS_CHAR(c))) {
            xmlFatalErrMsg(ctxt, XML_ERR_INVALID_CHAR,
                           "invalid character in attribute value\n");
        } else {
            xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                           "AttValue: ' expected\n");
        }
    } else
        NEXT;

    if (attlen != NULL) *attlen = (int) len;
    return(buf);

mem_error:
    xmlErrMemory(ctxt, NULL);
error:
    if (buf != NULL)
        xmlFree(buf);
    if (rep != NULL)
        xmlFree(rep);
    return(NULL);
}

/**
 * xmlParseAttValue:
 * @ctxt:  an XML parser context
 *
 * parse a value for an attribute
 * Note: the parser won't do substitution of entities here, this
 * will be handled later in xmlStringGetNodeList
 *
 * [10] AttValue ::= '"' ([^<&"] | Reference)* '"' |
 *                   "'" ([^<&'] | Reference)* "'"
 *
 * 3.3.3 Attribute-Value Normalization:
 * Before the value of an attribute is passed to the application or
 * checked for validity, the XML processor must normalize it as follows:
 * - a character reference is processed by appending the referenced
 *   character to the attribute value
 * - an entity reference is processed by recursively processing the
 *   replacement text of the entity
 * - a whitespace character (#x20, #xD, #xA, #x9) is processed by
 *   appending #x20 to the normalized value, except that only a single
 *   #x20 is appended for a "#xD#xA" sequence that is part of an external
 *   parsed entity or the literal entity value of an internal parsed entity
 * - other characters are processed by appending them to the normalized value
 * If the declared value is not CDATA, then the XML processor must further
 * process the normalized attribute value by discarding any leading and
 * trailing space (#x20) characters, and by replacing sequences of space
 * (#x20) characters by a single space (#x20) character.
 * All attributes for which no declaration has been read should be treated
 * by a non-validating parser as if declared CDATA.
 *
 * Returns the AttValue parsed or NULL. The value has to be freed by the caller.
 */


xmlChar *
xmlParseAttValue(xmlParserCtxtPtr ctxt) {
    if ((ctxt == NULL) || (ctxt->input == NULL)) return(NULL);
    return(xmlParseAttValueInternal(ctxt, NULL, NULL, 0));
}

/**
 * xmlParseSystemLiteral:
 * @ctxt:  an XML parser context
 *
 * parse an XML Literal
 *
 * [11] SystemLiteral ::= ('"' [^"]* '"') | ("'" [^']* "'")
 *
 * Returns the SystemLiteral parsed or NULL
 */

xmlChar *
xmlParseSystemLiteral(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = XML_PARSER_BUFFER_SIZE;
    int cur, l;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_TEXT_LENGTH :
                    XML_MAX_NAME_LENGTH;
    xmlChar stop;
    int state = ctxt->instate;
    int count = 0;

    SHRINK;
    if (RAW == '"') {
        NEXT;
        stop = '"';
    } else if (RAW == '\'') {
        NEXT;
        stop = '\'';
    } else {
        xmlFatalErr(ctxt, XML_ERR_LITERAL_NOT_STARTED, NULL);
        return(NULL);
    }

    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
    if (buf == NULL) {
        xmlErrMemory(ctxt, NULL);
        return(NULL);
    }
    ctxt->instate = XML_PARSER_SYSTEM_LITERAL;
    cur = CUR_CHAR(l);
    while ((IS_CHAR(cur)) && (cur != stop)) { /* checked */
        if (len + 5 >= size) {
            xmlChar *tmp;

            size *= 2;
            tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
            if (tmp == NULL) {
                xmlFree(buf);
                xmlErrMemory(ctxt, NULL);
                ctxt->instate = (xmlParserInputState) state;
                return(NULL);
            }
            buf = tmp;
        }
        count++;
        if (count > 50) {
            SHRINK;
            GROW;
            count = 0;
            if (ctxt->instate == XML_PARSER_EOF) {
                xmlFree(buf);
                return(NULL);
            }
        }
        COPY_BUF(l,buf,len,cur);
        NEXTL(l);
        cur = CUR_CHAR(l);
        if (cur == 0) {
            GROW;
            SHRINK;
            cur = CUR_CHAR(l);
        }
        if (len > maxLength) {
            xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "SystemLiteral");
            xmlFree(buf);
            ctxt->instate = (xmlParserInputState) state;
            return(NULL);
        }
    }
    buf[len] = 0;
    ctxt->instate = (xmlParserInputState) state;
    if (!IS_CHAR(cur)) {
        xmlFatalErr(ctxt, XML_ERR_LITERAL_NOT_FINISHED, NULL);
    } else {
        NEXT;
    }
    return(buf);
}

/**
 * xmlParsePubidLiteral:
 * @ctxt:  an XML parser context
 *
 * parse an XML public literal
 *
 * [12] PubidLiteral ::= '"' PubidChar* '"' | "'" (PubidChar - "'")* "'"
 *
 * Returns the PubidLiteral parsed or NULL.
 */

xmlChar *
xmlParsePubidLiteral(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = XML_PARSER_BUFFER_SIZE;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_TEXT_LENGTH :
                    XML_MAX_NAME_LENGTH;
    xmlChar cur;
    xmlChar stop;
    int count = 0;
    xmlParserInputState oldstate = ctxt->instate;

    SHRINK;
    if (RAW == '"') {
        NEXT;
        stop = '"';
    } else if (RAW == '\'') {
        NEXT;
        stop = '\'';
    } else {
        xmlFatalErr(ctxt, XML_ERR_LITERAL_NOT_STARTED, NULL);
        return(NULL);
    }
    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
    if (buf == NULL) {
        xmlErrMemory(ctxt, NULL);
        return(NULL);
    }
    ctxt->instate = XML_PARSER_PUBLIC_LITERAL;
    cur = CUR;
    while ((IS_PUBIDCHAR_CH(cur)) && (cur != stop)) { /* checked */
        if (len + 1 >= size) {
            xmlChar *tmp;

            size *= 2;
            tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
            if (tmp == NULL) {
                xmlErrMemory(ctxt, NULL);
                xmlFree(buf);
                return(NULL);
            }
            buf = tmp;
        }
        buf[len++] = cur;
        count++;
        if (count > 50) {
            SHRINK;
            GROW;
            count = 0;
            if (ctxt->instate == XML_PARSER_EOF) {
                xmlFree(buf);
                return(NULL);
            }
        }
        NEXT;
        cur = CUR;
        if (cur == 0) {
            GROW;
            SHRINK;
            cur = CUR;
        }
        if (len > maxLength) {
            xmlFatalErr(ctxt, XML_ERR_NAME_TOO_LONG, "Public ID");
            xmlFree(buf);
            return(NULL);
        }
    }
    buf[len] = 0;
    if (cur != stop) {
        xmlFatalErr(ctxt, XML_ERR_LITERAL_NOT_FINISHED, NULL);
    } else {
        NEXT;
    }
    ctxt->instate = oldstate;
    return(buf);
}

static void xmlParseCharDataComplex(xmlParserCtxtPtr ctxt, int cdata);

/*
 * used for the test in the inner loop of the char data testing
 */
static const unsigned char test_char_data[256] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x9, CR/LF separated */
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x00, 0x27, /* & */
    0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
    0x38, 0x39, 0x3A, 0x3B, 0x00, 0x3D, 0x3E, 0x3F, /* < */
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
    0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
    0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x00, 0x5E, 0x5F, /* ] */
    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
    0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
    0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* non-ascii */
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

/**
 * xmlParseCharData:
 * @ctxt:  an XML parser context
 * @cdata:  int indicating whether we are within a CDATA section
 *
 * parse a CharData section.
 * if we are within a CDATA section ']]>' marks an end of section.
 *
 * The right angle bracket (>) may be represented using the string "&gt;",
 * and must, for compatibility, be escaped using "&gt;" or a character
 * reference when it appears in the string "]]>" in content, when that
 * string is not marking the end of a CDATA section.
 *
 * [14] CharData ::= [^<&]* - ([^<&]* ']]>' [^<&]*)
 */

void
xmlParseCharData(xmlParserCtxtPtr ctxt, int cdata) {
    const xmlChar *in;
    int nbchar = 0;
    int line = ctxt->input->line;
    int col = ctxt->input->col;
    int ccol;

    SHRINK;
    GROW;
    /*
     * Accelerated common case where input don't need to be
     * modified before passing it to the handler.
     */
    if (!cdata) {
        in = ctxt->input->cur;
        do {
get_more_space:
            while (*in == 0x20) { in++; ctxt->input->col++; }
            if (*in == 0xA) {
                do {
                    ctxt->input->line++; ctxt->input->col = 1;
                    in++;
                } while (*in == 0xA);
                goto get_more_space;
            }
            if (*in == '<') {
                nbchar = in - ctxt->input->cur;
                if (nbchar > 0) {
                    const xmlChar *tmp = ctxt->input->cur;
                    ctxt->input->cur = in;

                    if ((ctxt->sax != NULL) &&
                        (ctxt->sax->ignorableWhitespace !=
                         ctxt->sax->characters)) {
                        if (areBlanks(ctxt, tmp, nbchar, 1)) {
                            if (ctxt->sax->ignorableWhitespace != NULL)
                                ctxt->sax->ignorableWhitespace(ctxt->userData,
                                                       tmp, nbchar);
                        } else {
                            if (ctxt->sax->characters != NULL)
                                ctxt->sax->characters(ctxt->userData,
                                                      tmp, nbchar);
                            if (*ctxt->space == -1)
                                *ctxt->space = -2;
                        }
                    } else if ((ctxt->sax != NULL) &&
                               (ctxt->sax->characters != NULL)) {
                        ctxt->sax->characters(ctxt->userData,
                                              tmp, nbchar);
                    }
                }
                return;
            }

get_more:
            ccol = ctxt->input->col;
            while (test_char_data[*in]) {
                in++;
                ccol++;
            }
            ctxt->input->col = ccol;
            if (*in == 0xA) {
                do {
                    ctxt->input->line++; ctxt->input->col = 1;
                    in++;
                } while (*in == 0xA);
                goto get_more;
            }
            if (*in == ']') {
                if ((in[1] == ']') && (in[2] == '>')) {
                    xmlFatalErr(ctxt, XML_ERR_MISPLACED_CDATA_END, NULL);
                    ctxt->input->cur = in + 1;
                    return;
                }
                in++;
                ctxt->input->col++;
                goto get_more;
            }
            nbchar = in - ctxt->input->cur;
            if (nbchar > 0) {
                if ((ctxt->sax != NULL) &&
                    (ctxt->sax->ignorableWhitespace !=
                     ctxt->sax->characters) &&
                    (IS_BLANK_CH(*ctxt->input->cur))) {
                    const xmlChar *tmp = ctxt->input->cur;
                    ctxt->input->cur = in;

                    if (areBlanks(ctxt, tmp, nbchar, 0)) {
                        if (ctxt->sax->ignorableWhitespace != NULL)
                            ctxt->sax->ignorableWhitespace(ctxt->userData,
                                                           tmp, nbchar);
                    } else {
                        if (ctxt->sax->characters != NULL)
                            ctxt->sax->characters(ctxt->userData,
                                                  tmp, nbchar);
                        if (*ctxt->space == -1)
                            *ctxt->space = -2;
                    }
                    line = ctxt->input->line;
                    col = ctxt->input->col;
                } else if (ctxt->sax != NULL) {
                    if (ctxt->sax->characters != NULL)
                        ctxt->sax->characters(ctxt->userData,
                                              ctxt->input->cur, nbchar);
                    line = ctxt->input->line;
                    col = ctxt->input->col;
                }
                /* something really bad happened in the SAX callback */
                if (ctxt->instate != XML_PARSER_CONTENT)
                    return;
            }
            ctxt->input->cur = in;
            if (*in == 0xD) {
                in++;
                if (*in == 0xA) {
                    ctxt->input->cur = in;
                    in++;
                    ctxt->input->line++; ctxt->input->col = 1;
                    continue; /* while */
                }
                in--;
            }
            if (*in == '<') {
                return;
            }
            if (*in == '&') {
                return;
            }
            SHRINK;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF)
                return;
            in = ctxt->input->cur;
        } while (((*in >= 0x20) && (*in <= 0x7F)) || (*in == 0x09) || (*in == 0x0a));
        nbchar = 0;
    }
    ctxt->input->line = line;
    ctxt->input->col = col;
    xmlParseCharDataComplex(ctxt, cdata);
}

/**
 * xmlParseCharDataComplex:
 * @ctxt:  an XML parser context
 * @cdata:  int indicating whether we are within a CDATA section
 *
 * parse a CharData section.this is the fallback function
 * of xmlParseCharData() when the parsing requires handling
 * of non-ASCII characters.
 */
static void
xmlParseCharDataComplex(xmlParserCtxtPtr ctxt, int cdata) {
    xmlChar buf[XML_PARSER_BIG_BUFFER_SIZE + 5];
    int nbchar = 0;
    int cur, l;
    int count = 0;

    SHRINK;
    GROW;
    cur = CUR_CHAR(l);
    while ((cur != '<') && /* checked */
           (cur != '&') &&
           (IS_CHAR(cur))) /* test also done in xmlCurrentChar() */ {
        if ((cur == ']') && (NXT(1) == ']') &&
            (NXT(2) == '>')) {
            if (cdata) break;
            else {
                xmlFatalErr(ctxt, XML_ERR_MISPLACED_CDATA_END, NULL);
            }
        }
        COPY_BUF(l,buf,nbchar,cur);
        /* move current position before possible calling of ctxt->sax->characters */
        NEXTL(l);
        cur = CUR_CHAR(l);
        if (nbchar >= XML_PARSER_BIG_BUFFER_SIZE) {
            buf[nbchar] = 0;

            /*
             * OK the segment is to be consumed as chars.
             */
            if ((ctxt->sax != NULL) && (!ctxt->disableSAX)) {
                if (areBlanks(ctxt, buf, nbchar, 0)) {
                    if (ctxt->sax->ignorableWhitespace != NULL)
                        ctxt->sax->ignorableWhitespace(ctxt->userData,
                                                       buf, nbchar);
                } else {
                    if (ctxt->sax->characters != NULL)
                        ctxt->sax->characters(ctxt->userData, buf, nbchar);
                    if ((ctxt->sax->characters !=
                         ctxt->sax->ignorableWhitespace) &&
                        (*ctxt->space == -1))
                        *ctxt->space = -2;
                }
            }
            nbchar = 0;
            /* something really bad happened in the SAX callback */
            if (ctxt->instate != XML_PARSER_CONTENT)
                return;
        }
        count++;
        if (count > 50) {
            SHRINK;
            GROW;
            count = 0;
            if (ctxt->instate == XML_PARSER_EOF)
                return;
        }
    }
    if (nbchar != 0) {
        buf[nbchar] = 0;
        /*
         * OK the segment is to be consumed as chars.
         */
        if ((ctxt->sax != NULL) && (!ctxt->disableSAX)) {
            if (areBlanks(ctxt, buf, nbchar, 0)) {
                if (ctxt->sax->ignorableWhitespace != NULL)
                    ctxt->sax->ignorableWhitespace(ctxt->userData, buf, nbchar);
            } else {
                if (ctxt->sax->characters != NULL)
                    ctxt->sax->characters(ctxt->userData, buf, nbchar);
                if ((ctxt->sax->characters != ctxt->sax->ignorableWhitespace) &&
                    (*ctxt->space == -1))
                    *ctxt->space = -2;
            }
        }
    }
    if ((cur != 0) && (!IS_CHAR(cur))) {
        /* Generate the error and skip the offending character */
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "PCDATA invalid Char value %d\n",
                          cur);
        NEXTL(l);
    }
}

/**
 * xmlParseExternalID:
 * @ctxt:  an XML parser context
 * @publicID:  a xmlChar** receiving PubidLiteral
 * @strict: indicate whether we should restrict parsing to only
 *          production [75], see NOTE below
 *
 * Parse an External ID or a Public ID
 *
 * NOTE: Productions [75] and [83] interact badly since [75] can generate
 *       'PUBLIC' S PubidLiteral S SystemLiteral
 *
 * [75] ExternalID ::= 'SYSTEM' S SystemLiteral
 *                   | 'PUBLIC' S PubidLiteral S SystemLiteral
 *
 * [83] PublicID ::= 'PUBLIC' S PubidLiteral
 *
 * Returns the function returns SystemLiteral and in the second
 *                case publicID receives PubidLiteral, is strict is off
 *                it is possible to return NULL and have publicID set.
 */

xmlChar *
xmlParseExternalID(xmlParserCtxtPtr ctxt, xmlChar **publicID, int strict) {
    xmlChar *URI = NULL;

    SHRINK;

    *publicID = NULL;
    if (CMP6(CUR_PTR, 'S', 'Y', 'S', 'T', 'E', 'M')) {
        SKIP(6);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after 'SYSTEM'\n");
        }
        URI = xmlParseSystemLiteral(ctxt);
        if (URI == NULL) {
            xmlFatalErr(ctxt, XML_ERR_URI_REQUIRED, NULL);
        }
    } else if (CMP6(CUR_PTR, 'P', 'U', 'B', 'L', 'I', 'C')) {
        SKIP(6);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                    "Space required after 'PUBLIC'\n");
        }
        *publicID = xmlParsePubidLiteral(ctxt);
        if (*publicID == NULL) {
            xmlFatalErr(ctxt, XML_ERR_PUBID_REQUIRED, NULL);
        }
        if (strict) {
            /*
             * We don't handle [83] so "S SystemLiteral" is required.
             */
            if (SKIP_BLANKS == 0) {
                xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                        "Space required after the Public Identifier\n");
            }
        } else {
            /*
             * We handle [83] so we return immediately, if
             * "S SystemLiteral" is not detected. We skip blanks if no
             * system literal was found, but this is harmless since we must
             * be at the end of a NotationDecl.
             */
            if (SKIP_BLANKS == 0) return(NULL);
            if ((CUR != '\'') && (CUR != '"')) return(NULL);
        }
        URI = xmlParseSystemLiteral(ctxt);
        if (URI == NULL) {
            xmlFatalErr(ctxt, XML_ERR_URI_REQUIRED, NULL);
        }
    }
    return(URI);
}

/**
 * xmlParseCommentComplex:
 * @ctxt:  an XML parser context
 * @buf:  the already parsed part of the buffer
 * @len:  number of bytes in the buffer
 * @size:  allocated size of the buffer
 *
 * Skip an XML (SGML) comment <!-- .... -->
 *  The spec says that "For compatibility, the string "--" (double-hyphen)
 *  must not occur within comments. "
 * This is the slow routine in case the accelerator for ascii didn't work
 *
 * [15] Comment ::= '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'
 */
static void
xmlParseCommentComplex(xmlParserCtxtPtr ctxt, xmlChar *buf,
                       size_t len, size_t size) {
    int q, ql;
    int r, rl;
    int cur, l;
    size_t count = 0;
    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                       XML_MAX_HUGE_LENGTH :
                       XML_MAX_TEXT_LENGTH;
    int inputid;

    inputid = ctxt->input->id;

    if (buf == NULL) {
        len = 0;
        size = XML_PARSER_BUFFER_SIZE;
        buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
        if (buf == NULL) {
            xmlErrMemory(ctxt, NULL);
            return;
        }
    }
    GROW;       /* Assure there's enough input data */
    q = CUR_CHAR(ql);
    if (q == 0)
        goto not_terminated;
    if (!IS_CHAR(q)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "xmlParseComment: invalid xmlChar value %d\n",
                          q);
        xmlFree (buf);
        return;
    }
    NEXTL(ql);
    r = CUR_CHAR(rl);
    if (r == 0)
        goto not_terminated;
    if (!IS_CHAR(r)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "xmlParseComment: invalid xmlChar value %d\n",
                          q);
        xmlFree (buf);
        return;
    }
    NEXTL(rl);
    cur = CUR_CHAR(l);
    if (cur == 0)
        goto not_terminated;
    while (IS_CHAR(cur) && /* checked */
           ((cur != '>') ||
            (r != '-') || (q != '-'))) {
        if ((r == '-') && (q == '-')) {
            xmlFatalErr(ctxt, XML_ERR_HYPHEN_IN_COMMENT, NULL);
        }
        if (len + 5 >= size) {
            xmlChar *new_buf;
            size_t new_size;

            new_size = size * 2;
            new_buf = (xmlChar *) xmlRealloc(buf, new_size);
            if (new_buf == NULL) {
                xmlFree (buf);
                xmlErrMemory(ctxt, NULL);
                return;
            }
            buf = new_buf;
            size = new_size;
        }
        COPY_BUF(ql,buf,len,q);
        q = r;
        ql = rl;
        r = cur;
        rl = l;

        count++;
        if (count > 50) {
            SHRINK;
            GROW;
            count = 0;
            if (ctxt->instate == XML_PARSER_EOF) {
                xmlFree(buf);
                return;
            }
        }
        NEXTL(l);
        cur = CUR_CHAR(l);
        if (cur == 0) {
            SHRINK;
            GROW;
            cur = CUR_CHAR(l);
        }

        if (len > maxLength) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
                         "Comment too big found", NULL);
            xmlFree (buf);
            return;
        }
    }
    buf[len] = 0;
    if (cur == 0) {
        xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
                             "Comment not terminated \n<!--%.50s\n", buf);
    } else if (!IS_CHAR(cur)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "xmlParseComment: invalid xmlChar value %d\n",
                          cur);
    } else {
        if (inputid != ctxt->input->id) {
            xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                           "Comment doesn't start and stop in the same"
                           " entity\n");
        }
        NEXT;
        if ((ctxt->sax != NULL) && (ctxt->sax->comment != NULL) &&
            (!ctxt->disableSAX))
            ctxt->sax->comment(ctxt->userData, buf);
    }
    xmlFree(buf);
    return;
not_terminated:
    xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
                         "Comment not terminated\n", NULL);
    xmlFree(buf);
    return;
}

/**
 * xmlParseComment:
 * @ctxt:  an XML parser context
 *
 * Skip an XML (SGML) comment <!-- .... -->
 *  The spec says that "For compatibility, the string "--" (double-hyphen)
 *  must not occur within comments. "
 *
 * [15] Comment ::= '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'
 */
void
xmlParseComment(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    size_t size = XML_PARSER_BUFFER_SIZE;
    size_t len = 0;
    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                       XML_MAX_HUGE_LENGTH :
                       XML_MAX_TEXT_LENGTH;
    xmlParserInputState state;
    const xmlChar *in;
    size_t nbchar = 0;
    int ccol;
    int inputid;

    /*
     * Check that there is a comment right here.
     */
    if ((RAW != '<') || (NXT(1) != '!') ||
        (NXT(2) != '-') || (NXT(3) != '-')) return;
    state = ctxt->instate;
    ctxt->instate = XML_PARSER_COMMENT;
    inputid = ctxt->input->id;
    SKIP(4);
    SHRINK;
    GROW;

    /*
     * Accelerated common case where input don't need to be
     * modified before passing it to the handler.
     */
    in = ctxt->input->cur;
    do {
        if (*in == 0xA) {
            do {
                ctxt->input->line++; ctxt->input->col = 1;
                in++;
            } while (*in == 0xA);
        }
get_more:
        ccol = ctxt->input->col;
        while (((*in > '-') && (*in <= 0x7F)) ||
               ((*in >= 0x20) && (*in < '-')) ||
               (*in == 0x09)) {
                    in++;
                    ccol++;
        }
        ctxt->input->col = ccol;
        if (*in == 0xA) {
            do {
                ctxt->input->line++; ctxt->input->col = 1;
                in++;
            } while (*in == 0xA);
            goto get_more;
        }
        nbchar = in - ctxt->input->cur;
        /*
         * save current set of data
         */
        if (nbchar > 0) {
            if ((ctxt->sax != NULL) &&
                (ctxt->sax->comment != NULL)) {
                if (buf == NULL) {
                    if ((*in == '-') && (in[1] == '-'))
                        size = nbchar + 1;
                    else
                        size = XML_PARSER_BUFFER_SIZE + nbchar;
                    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
                    if (buf == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        ctxt->instate = state;
                        return;
                    }
                    len = 0;
                } else if (len + nbchar + 1 >= size) {
                    xmlChar *new_buf;
                    size  += len + nbchar + XML_PARSER_BUFFER_SIZE;
                    new_buf = (xmlChar *) xmlRealloc(buf,
                                                     size * sizeof(xmlChar));
                    if (new_buf == NULL) {
                        xmlFree (buf);
                        xmlErrMemory(ctxt, NULL);
                        ctxt->instate = state;
                        return;
                    }
                    buf = new_buf;
                }
                memcpy(&buf[len], ctxt->input->cur, nbchar);
                len += nbchar;
                buf[len] = 0;
            }
        }
        if (len > maxLength) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_COMMENT_NOT_FINISHED,
                         "Comment too big found", NULL);
            xmlFree (buf);
            return;
        }
        ctxt->input->cur = in;
        if (*in == 0xA) {
            in++;
            ctxt->input->line++; ctxt->input->col = 1;
        }
        if (*in == 0xD) {
            in++;
            if (*in == 0xA) {
                ctxt->input->cur = in;
                in++;
                ctxt->input->line++; ctxt->input->col = 1;
                goto get_more;
            }
            in--;
        }
        SHRINK;
        GROW;
        if (ctxt->instate == XML_PARSER_EOF) {
            xmlFree(buf);
            return;
        }
        in = ctxt->input->cur;
        if (*in == '-') {
            if (in[1] == '-') {
                if (in[2] == '>') {
                    if (ctxt->input->id != inputid) {
                        xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                                       "comment doesn't start and stop in the"
                                       " same entity\n");
                    }
                    SKIP(3);
                    if ((ctxt->sax != NULL) && (ctxt->sax->comment != NULL) &&
                        (!ctxt->disableSAX)) {
                        if (buf != NULL)
                            ctxt->sax->comment(ctxt->userData, buf);
                        else
                            ctxt->sax->comment(ctxt->userData, BAD_CAST "");
                    }
                    if (buf != NULL)
                        xmlFree(buf);
                    if (ctxt->instate != XML_PARSER_EOF)
                        ctxt->instate = state;
                    return;
                }
                if (buf != NULL) {
                    xmlFatalErrMsgStr(ctxt, XML_ERR_HYPHEN_IN_COMMENT,
                                      "Double hyphen within comment: "
                                      "<!--%.50s\n",
                                      buf);
                } else
                    xmlFatalErrMsgStr(ctxt, XML_ERR_HYPHEN_IN_COMMENT,
                                      "Double hyphen within comment\n", NULL);
                if (ctxt->instate == XML_PARSER_EOF) {
                    xmlFree(buf);
                    return;
                }
                in++;
                ctxt->input->col++;
            }
            in++;
            ctxt->input->col++;
            goto get_more;
        }
    } while (((*in >= 0x20) && (*in <= 0x7F)) || (*in == 0x09) || (*in == 0x0a));
    xmlParseCommentComplex(ctxt, buf, len, size);
    ctxt->instate = state;
    return;
}


/**
 * xmlParsePITarget:
 * @ctxt:  an XML parser context
 *
 * parse the name of a PI
 *
 * [17] PITarget ::= Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))
 *
 * Returns the PITarget name or NULL
 */

const xmlChar *
xmlParsePITarget(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;

    name = xmlParseName(ctxt);
    if ((name != NULL) &&
        ((name[0] == 'x') || (name[0] == 'X')) &&
        ((name[1] == 'm') || (name[1] == 'M')) &&
        ((name[2] == 'l') || (name[2] == 'L'))) {
        int i;
        if ((name[0] == 'x') && (name[1] == 'm') &&
            (name[2] == 'l') && (name[3] == 0)) {
            xmlFatalErrMsg(ctxt, XML_ERR_RESERVED_XML_NAME,
                 "XML declaration allowed only at the start of the document\n");
            return(name);
        } else if (name[3] == 0) {
            xmlFatalErr(ctxt, XML_ERR_RESERVED_XML_NAME, NULL);
            return(name);
        }
        for (i = 0;;i++) {
            if (xmlW3CPIs[i] == NULL) break;
            if (xmlStrEqual(name, (const xmlChar *)xmlW3CPIs[i]))
                return(name);
        }
        xmlWarningMsg(ctxt, XML_ERR_RESERVED_XML_NAME,
                      "xmlParsePITarget: invalid name prefix 'xml'\n",
                      NULL, NULL);
    }
    if ((name != NULL) && (xmlStrchr(name, ':') != NULL)) {
        xmlNsErr(ctxt, XML_NS_ERR_COLON,
                 "colons are forbidden from PI names '%s'\n", name, NULL, NULL);
    }
    return(name);
}

#ifdef LIBXML_CATALOG_ENABLED
/**
 * xmlParseCatalogPI:
 * @ctxt:  an XML parser context
 * @catalog:  the PI value string
 *
 * parse an XML Catalog Processing Instruction.
 *
 * <?oasis-xml-catalog catalog="http://example.com/catalog.xml"?>
 *
 * Occurs only if allowed by the user and if happening in the Misc
 * part of the document before any doctype information
 * This will add the given catalog to the parsing context in order
 * to be used if there is a resolution need further down in the document
 */

static void
xmlParseCatalogPI(xmlParserCtxtPtr ctxt, const xmlChar *catalog) {
    xmlChar *URL = NULL;
    const xmlChar *tmp, *base;
    xmlChar marker;

    tmp = catalog;
    while (IS_BLANK_CH(*tmp)) tmp++;
    if (xmlStrncmp(tmp, BAD_CAST"catalog", 7))
        goto error;
    tmp += 7;
    while (IS_BLANK_CH(*tmp)) tmp++;
    if (*tmp != '=') {
        return;
    }
    tmp++;
    while (IS_BLANK_CH(*tmp)) tmp++;
    marker = *tmp;
    if ((marker != '\'') && (marker != '"'))
        goto error;
    tmp++;
    base = tmp;
    while ((*tmp != 0) && (*tmp != marker)) tmp++;
    if (*tmp == 0)
        goto error;
    URL = xmlStrndup(base, tmp - base);
    tmp++;
    while (IS_BLANK_CH(*tmp)) tmp++;
    if (*tmp != 0)
        goto error;

    if (URL != NULL) {
        ctxt->catalogs = xmlCatalogAddLocal(ctxt->catalogs, URL);
        xmlFree(URL);
    }
    return;

error:
    xmlWarningMsg(ctxt, XML_WAR_CATALOG_PI,
                  "Catalog PI syntax error: %s\n",
                  catalog, NULL);
    if (URL != NULL)
        xmlFree(URL);
}
#endif

/**
 * xmlParsePI:
 * @ctxt:  an XML parser context
 *
 * parse an XML Processing Instruction.
 *
 * [16] PI ::= '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
 *
 * The processing is transferred to SAX once parsed.
 */

void
xmlParsePI(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    size_t len = 0;
    size_t size = XML_PARSER_BUFFER_SIZE;
    size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                       XML_MAX_HUGE_LENGTH :
                       XML_MAX_TEXT_LENGTH;
    int cur, l;
    const xmlChar *target;
    xmlParserInputState state;
    int count = 0;

    if ((RAW == '<') && (NXT(1) == '?')) {
        int inputid = ctxt->input->id;
        state = ctxt->instate;
        ctxt->instate = XML_PARSER_PI;
        /*
         * this is a Processing Instruction.
         */
        SKIP(2);
        SHRINK;

        /*
         * Parse the target name and check for special support like
         * namespace.
         */
        target = xmlParsePITarget(ctxt);
        if (target != NULL) {
            if ((RAW == '?') && (NXT(1) == '>')) {
                if (inputid != ctxt->input->id) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                                   "PI declaration doesn't start and stop in"
                                   " the same entity\n");
                }
                SKIP(2);

                /*
                 * SAX: PI detected.
                 */
                if ((ctxt->sax) && (!ctxt->disableSAX) &&
                    (ctxt->sax->processingInstruction != NULL))
                    ctxt->sax->processingInstruction(ctxt->userData,
                                                     target, NULL);
                if (ctxt->instate != XML_PARSER_EOF)
                    ctxt->instate = state;
                return;
            }
            buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
            if (buf == NULL) {
                xmlErrMemory(ctxt, NULL);
                ctxt->instate = state;
                return;
            }
            if (SKIP_BLANKS == 0) {
                xmlFatalErrMsgStr(ctxt, XML_ERR_SPACE_REQUIRED,
                          "ParsePI: PI %s space expected\n", target);
            }
            cur = CUR_CHAR(l);
            while (IS_CHAR(cur) && /* checked */
                   ((cur != '?') || (NXT(1) != '>'))) {
                if (len + 5 >= size) {
                    xmlChar *tmp;
                    size_t new_size = size * 2;
                    tmp = (xmlChar *) xmlRealloc(buf, new_size);
                    if (tmp == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        xmlFree(buf);
                        ctxt->instate = state;
                        return;
                    }
                    buf = tmp;
                    size = new_size;
                }
                count++;
                if (count > 50) {
                    SHRINK;
                    GROW;
                    if (ctxt->instate == XML_PARSER_EOF) {
                        xmlFree(buf);
                        return;
                    }
                    count = 0;
                }
                COPY_BUF(l,buf,len,cur);
                NEXTL(l);
                cur = CUR_CHAR(l);
                if (cur == 0) {
                    SHRINK;
                    GROW;
                    cur = CUR_CHAR(l);
                }
                if (len > maxLength) {
                    xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED,
                                      "PI %s too big found", target);
                    xmlFree(buf);
                    ctxt->instate = state;
                    return;
                }
            }
            buf[len] = 0;
            if (cur != '?') {
                xmlFatalErrMsgStr(ctxt, XML_ERR_PI_NOT_FINISHED,
                      "ParsePI: PI %s never end ...\n", target);
            } else {
                if (inputid != ctxt->input->id) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                                   "PI declaration doesn't start and stop in"
                                   " the same entity\n");
                }
                SKIP(2);

#ifdef LIBXML_CATALOG_ENABLED
                if (((state == XML_PARSER_MISC) ||
                     (state == XML_PARSER_START)) &&
                    (xmlStrEqual(target, XML_CATALOG_PI))) {
                    xmlCatalogAllow allow = xmlCatalogGetDefaults();
                    if ((allow == XML_CATA_ALLOW_DOCUMENT) ||
                        (allow == XML_CATA_ALLOW_ALL))
                        xmlParseCatalogPI(ctxt, buf);
                }
#endif


                /*
                 * SAX: PI detected.
                 */
                if ((ctxt->sax) && (!ctxt->disableSAX) &&
                    (ctxt->sax->processingInstruction != NULL))
                    ctxt->sax->processingInstruction(ctxt->userData,
                                                     target, buf);
            }
            xmlFree(buf);
        } else {
            xmlFatalErr(ctxt, XML_ERR_PI_NOT_STARTED, NULL);
        }
        if (ctxt->instate != XML_PARSER_EOF)
            ctxt->instate = state;
    }
}

/**
 * xmlParseNotationDecl:
 * @ctxt:  an XML parser context
 *
 * parse a notation declaration
 *
 * [82] NotationDecl ::= '<!NOTATION' S Name S (ExternalID |  PublicID) S? '>'
 *
 * Hence there is actually 3 choices:
 *     'PUBLIC' S PubidLiteral
 *     'PUBLIC' S PubidLiteral S SystemLiteral
 * and 'SYSTEM' S SystemLiteral
 *
 * See the NOTE on xmlParseExternalID().
 */

void
xmlParseNotationDecl(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;
    xmlChar *Pubid;
    xmlChar *Systemid;

    if (CMP10(CUR_PTR, '<', '!', 'N', 'O', 'T', 'A', 'T', 'I', 'O', 'N')) {
        int inputid = ctxt->input->id;
        SHRINK;
        SKIP(10);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after '<!NOTATION'\n");
            return;
        }

        name = xmlParseName(ctxt);
        if (name == NULL) {
            xmlFatalErr(ctxt, XML_ERR_NOTATION_NOT_STARTED, NULL);
            return;
        }
        if (xmlStrchr(name, ':') != NULL) {
            xmlNsErr(ctxt, XML_NS_ERR_COLON,
                     "colons are forbidden from notation names '%s'\n",
                     name, NULL, NULL);
        }
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                     "Space required after the NOTATION name'\n");
            return;
        }

        /*
         * Parse the IDs.
         */
        Systemid = xmlParseExternalID(ctxt, &Pubid, 0);
        SKIP_BLANKS;

        if (RAW == '>') {
            if (inputid != ctxt->input->id) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "Notation declaration doesn't start and stop"
                               " in the same entity\n");
            }
            NEXT;
            if ((ctxt->sax != NULL) && (!ctxt->disableSAX) &&
                (ctxt->sax->notationDecl != NULL))
                ctxt->sax->notationDecl(ctxt->userData, name, Pubid, Systemid);
        } else {
            xmlFatalErr(ctxt, XML_ERR_NOTATION_NOT_FINISHED, NULL);
        }
        if (Systemid != NULL) xmlFree(Systemid);
        if (Pubid != NULL) xmlFree(Pubid);
    }
}

/**
 * xmlParseEntityDecl:
 * @ctxt:  an XML parser context
 *
 * parse <!ENTITY declarations
 *
 * [70] EntityDecl ::= GEDecl | PEDecl
 *
 * [71] GEDecl ::= '<!ENTITY' S Name S EntityDef S? '>'
 *
 * [72] PEDecl ::= '<!ENTITY' S '%' S Name S PEDef S? '>'
 *
 * [73] EntityDef ::= EntityValue | (ExternalID NDataDecl?)
 *
 * [74] PEDef ::= EntityValue | ExternalID
 *
 * [76] NDataDecl ::= S 'NDATA' S Name
 *
 * [ VC: Notation Declared ]
 * The Name must match the declared name of a notation.
 */

void
xmlParseEntityDecl(xmlParserCtxtPtr ctxt) {
    const xmlChar *name = NULL;
    xmlChar *value = NULL;
    xmlChar *URI = NULL, *literal = NULL;
    const xmlChar *ndata = NULL;
    int isParameter = 0;
    xmlChar *orig = NULL;

    /* GROW; done in the caller */
    if (CMP8(CUR_PTR, '<', '!', 'E', 'N', 'T', 'I', 'T', 'Y')) {
        int inputid = ctxt->input->id;
        SHRINK;
        SKIP(8);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after '<!ENTITY'\n");
        }

        if (RAW == '%') {
            NEXT;
            if (SKIP_BLANKS == 0) {
                xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                               "Space required after '%%'\n");
            }
            isParameter = 1;
        }

        name = xmlParseName(ctxt);
        if (name == NULL) {
            xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                           "xmlParseEntityDecl: no name\n");
            return;
        }
        if (xmlStrchr(name, ':') != NULL) {
            xmlNsErr(ctxt, XML_NS_ERR_COLON,
                     "colons are forbidden from entities names '%s'\n",
                     name, NULL, NULL);
        }
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after the entity name\n");
        }

        ctxt->instate = XML_PARSER_ENTITY_DECL;
        /*
         * handle the various case of definitions...
         */
        if (isParameter) {
            if ((RAW == '"') || (RAW == '\'')) {
                value = xmlParseEntityValue(ctxt, &orig);
                if (value) {
                    if ((ctxt->sax != NULL) &&
                        (!ctxt->disableSAX) && (ctxt->sax->entityDecl != NULL))
                        ctxt->sax->entityDecl(ctxt->userData, name,
                                    XML_INTERNAL_PARAMETER_ENTITY,
                                    NULL, NULL, value);
                }
            } else {
                URI = xmlParseExternalID(ctxt, &literal, 1);
                if ((URI == NULL) && (literal == NULL)) {
                    xmlFatalErr(ctxt, XML_ERR_VALUE_REQUIRED, NULL);
                }
                if (URI) {
                    xmlURIPtr uri;

                    uri = xmlParseURI((const char *) URI);
                    if (uri == NULL) {
                        xmlErrMsgStr(ctxt, XML_ERR_INVALID_URI,
                                     "Invalid URI: %s\n", URI);
                        /*
                         * This really ought to be a well formedness error
                         * but the XML Core WG decided otherwise c.f. issue
                         * E26 of the XML erratas.
                         */
                    } else {
                        if (uri->fragment != NULL) {
                            /*
                             * Okay this is foolish to block those but not
                             * invalid URIs.
                             */
                            xmlFatalErr(ctxt, XML_ERR_URI_FRAGMENT, NULL);
                        } else {
                            if ((ctxt->sax != NULL) &&
                                (!ctxt->disableSAX) &&
                                (ctxt->sax->entityDecl != NULL))
                                ctxt->sax->entityDecl(ctxt->userData, name,
                                            XML_EXTERNAL_PARAMETER_ENTITY,
                                            literal, URI, NULL);
                        }
                        xmlFreeURI(uri);
                    }
                }
            }
        } else {
            if ((RAW == '"') || (RAW == '\'')) {
                value = xmlParseEntityValue(ctxt, &orig);
                if ((ctxt->sax != NULL) &&
                    (!ctxt->disableSAX) && (ctxt->sax->entityDecl != NULL))
                    ctxt->sax->entityDecl(ctxt->userData, name,
                                XML_INTERNAL_GENERAL_ENTITY,
                                NULL, NULL, value);
                /*
                 * For expat compatibility in SAX mode.
                 */
                if ((ctxt->myDoc == NULL) ||
                    (xmlStrEqual(ctxt->myDoc->version, SAX_COMPAT_MODE))) {
                    if (ctxt->myDoc == NULL) {
                        ctxt->myDoc = xmlNewDoc(SAX_COMPAT_MODE);
                        if (ctxt->myDoc == NULL) {
                            xmlErrMemory(ctxt, "New Doc failed");
                            return;
                        }
                        ctxt->myDoc->properties = XML_DOC_INTERNAL;
                    }
                    if (ctxt->myDoc->intSubset == NULL)
                        ctxt->myDoc->intSubset = xmlNewDtd(ctxt->myDoc,
                                            BAD_CAST "fake", NULL, NULL);

                    xmlSAX2EntityDecl(ctxt, name, XML_INTERNAL_GENERAL_ENTITY,
                                      NULL, NULL, value);
                }
            } else {
                URI = xmlParseExternalID(ctxt, &literal, 1);
                if ((URI == NULL) && (literal == NULL)) {
                    xmlFatalErr(ctxt, XML_ERR_VALUE_REQUIRED, NULL);
                }
                if (URI) {
                    xmlURIPtr uri;

                    uri = xmlParseURI((const char *)URI);
                    if (uri == NULL) {
                        xmlErrMsgStr(ctxt, XML_ERR_INVALID_URI,
                                     "Invalid URI: %s\n", URI);
                        /*
                         * This really ought to be a well formedness error
                         * but the XML Core WG decided otherwise c.f. issue
                         * E26 of the XML erratas.
                         */
                    } else {
                        if (uri->fragment != NULL) {
                            /*
                             * Okay this is foolish to block those but not
                             * invalid URIs.
                             */
                            xmlFatalErr(ctxt, XML_ERR_URI_FRAGMENT, NULL);
                        }
                        xmlFreeURI(uri);
                    }
                }
                if ((RAW != '>') && (SKIP_BLANKS == 0)) {
                    xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                                   "Space required before 'NDATA'\n");
                }
                if (CMP5(CUR_PTR, 'N', 'D', 'A', 'T', 'A')) {
                    SKIP(5);
                    if (SKIP_BLANKS == 0) {
                        xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                                       "Space required after 'NDATA'\n");
                    }
                    ndata = xmlParseName(ctxt);
                    if ((ctxt->sax != NULL) && (!ctxt->disableSAX) &&
                        (ctxt->sax->unparsedEntityDecl != NULL))
                        ctxt->sax->unparsedEntityDecl(ctxt->userData, name,
                                    literal, URI, ndata);
                } else {
                    if ((ctxt->sax != NULL) &&
                        (!ctxt->disableSAX) && (ctxt->sax->entityDecl != NULL))
                        ctxt->sax->entityDecl(ctxt->userData, name,
                                    XML_EXTERNAL_GENERAL_PARSED_ENTITY,
                                    literal, URI, NULL);
                    /*
                     * For expat compatibility in SAX mode.
                     * assuming the entity replacement was asked for
                     */
                    if ((ctxt->replaceEntities != 0) &&
                        ((ctxt->myDoc == NULL) ||
                        (xmlStrEqual(ctxt->myDoc->version, SAX_COMPAT_MODE)))) {
                        if (ctxt->myDoc == NULL) {
                            ctxt->myDoc = xmlNewDoc(SAX_COMPAT_MODE);
                            if (ctxt->myDoc == NULL) {
                                xmlErrMemory(ctxt, "New Doc failed");
                                return;
                            }
                            ctxt->myDoc->properties = XML_DOC_INTERNAL;
                        }

                        if (ctxt->myDoc->intSubset == NULL)
                            ctxt->myDoc->intSubset = xmlNewDtd(ctxt->myDoc,
                                                BAD_CAST "fake", NULL, NULL);
                        xmlSAX2EntityDecl(ctxt, name,
                                          XML_EXTERNAL_GENERAL_PARSED_ENTITY,
                                          literal, URI, NULL);
                    }
                }
            }
        }
        if (ctxt->instate == XML_PARSER_EOF)
            goto done;
        SKIP_BLANKS;
        if (RAW != '>') {
            xmlFatalErrMsgStr(ctxt, XML_ERR_ENTITY_NOT_FINISHED,
                    "xmlParseEntityDecl: entity %s not terminated\n", name);
            xmlHaltParser(ctxt);
        } else {
            if (inputid != ctxt->input->id) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "Entity declaration doesn't start and stop in"
                               " the same entity\n");
            }
            NEXT;
        }
        if (orig != NULL) {
            /*
             * Ugly mechanism to save the raw entity value.
             */
            xmlEntityPtr cur = NULL;

            if (isParameter) {
                if ((ctxt->sax != NULL) &&
                    (ctxt->sax->getParameterEntity != NULL))
                    cur = ctxt->sax->getParameterEntity(ctxt->userData, name);
            } else {
                if ((ctxt->sax != NULL) &&
                    (ctxt->sax->getEntity != NULL))
                    cur = ctxt->sax->getEntity(ctxt->userData, name);
                if ((cur == NULL) && (ctxt->userData==ctxt)) {
                    cur = xmlSAX2GetEntity(ctxt, name);
                }
            }
            if ((cur != NULL) && (cur->orig == NULL)) {
                cur->orig = orig;
                orig = NULL;
            }
        }

done:
        if (value != NULL) xmlFree(value);
        if (URI != NULL) xmlFree(URI);
        if (literal != NULL) xmlFree(literal);
        if (orig != NULL) xmlFree(orig);
    }
}

/**
 * xmlParseDefaultDecl:
 * @ctxt:  an XML parser context
 * @value:  Receive a possible fixed default value for the attribute
 *
 * Parse an attribute default declaration
 *
 * [60] DefaultDecl ::= '#REQUIRED' | '#IMPLIED' | (('#FIXED' S)? AttValue)
 *
 * [ VC: Required Attribute ]
 * if the default declaration is the keyword #REQUIRED, then the
 * attribute must be specified for all elements of the type in the
 * attribute-list declaration.
 *
 * [ VC: Attribute Default Legal ]
 * The declared default value must meet the lexical constraints of
 * the declared attribute type c.f. xmlValidateAttributeDecl()
 *
 * [ VC: Fixed Attribute Default ]
 * if an attribute has a default value declared with the #FIXED
 * keyword, instances of that attribute must match the default value.
 *
 * [ WFC: No < in Attribute Values ]
 * handled in xmlParseAttValue()
 *
 * returns: XML_ATTRIBUTE_NONE, XML_ATTRIBUTE_REQUIRED, XML_ATTRIBUTE_IMPLIED
 *          or XML_ATTRIBUTE_FIXED.
 */

int
xmlParseDefaultDecl(xmlParserCtxtPtr ctxt, xmlChar **value) {
    int val;
    xmlChar *ret;

    *value = NULL;
    if (CMP9(CUR_PTR, '#', 'R', 'E', 'Q', 'U', 'I', 'R', 'E', 'D')) {
        SKIP(9);
        return(XML_ATTRIBUTE_REQUIRED);
    }
    if (CMP8(CUR_PTR, '#', 'I', 'M', 'P', 'L', 'I', 'E', 'D')) {
        SKIP(8);
        return(XML_ATTRIBUTE_IMPLIED);
    }
    val = XML_ATTRIBUTE_NONE;
    if (CMP6(CUR_PTR, '#', 'F', 'I', 'X', 'E', 'D')) {
        SKIP(6);
        val = XML_ATTRIBUTE_FIXED;
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after '#FIXED'\n");
        }
    }
    ret = xmlParseAttValue(ctxt);
    ctxt->instate = XML_PARSER_DTD;
    if (ret == NULL) {
        xmlFatalErrMsg(ctxt, (xmlParserErrors)ctxt->errNo,
                       "Attribute default value declaration error\n");
    } else
        *value = ret;
    return(val);
}

/**
 * xmlParseNotationType:
 * @ctxt:  an XML parser context
 *
 * parse an Notation attribute type.
 *
 * Note: the leading 'NOTATION' S part has already being parsed...
 *
 * [58] NotationType ::= 'NOTATION' S '(' S? Name (S? '|' S? Name)* S? ')'
 *
 * [ VC: Notation Attributes ]
 * Values of this type must match one of the notation names included
 * in the declaration; all notation names in the declaration must be declared.
 *
 * Returns: the notation attribute tree built while parsing
 */

xmlEnumerationPtr
xmlParseNotationType(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;
    xmlEnumerationPtr ret = NULL, last = NULL, cur, tmp;

    if (RAW != '(') {
        xmlFatalErr(ctxt, XML_ERR_NOTATION_NOT_STARTED, NULL);
        return(NULL);
    }
    SHRINK;
    do {
        NEXT;
        SKIP_BLANKS;
        name = xmlParseName(ctxt);
        if (name == NULL) {
            xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                           "Name expected in NOTATION declaration\n");
            xmlFreeEnumeration(ret);
            return(NULL);
        }
        tmp = ret;
        while (tmp != NULL) {
            if (xmlStrEqual(name, tmp->name)) {
                xmlValidityError(ctxt, XML_DTD_DUP_TOKEN,
          "standalone: attribute notation value token %s duplicated\n",
                                 name, NULL);
                if (!xmlDictOwns(ctxt->dict, name))
                    xmlFree((xmlChar *) name);
                break;
            }
            tmp = tmp->next;
        }
        if (tmp == NULL) {
            cur = xmlCreateEnumeration(name);
            if (cur == NULL) {
                xmlFreeEnumeration(ret);
                return(NULL);
            }
            if (last == NULL) ret = last = cur;
            else {
                last->next = cur;
                last = cur;
            }
        }
        SKIP_BLANKS;
    } while (RAW == '|');
    if (RAW != ')') {
        xmlFatalErr(ctxt, XML_ERR_NOTATION_NOT_FINISHED, NULL);
        xmlFreeEnumeration(ret);
        return(NULL);
    }
    NEXT;
    return(ret);
}

/**
 * xmlParseEnumerationType:
 * @ctxt:  an XML parser context
 *
 * parse an Enumeration attribute type.
 *
 * [59] Enumeration ::= '(' S? Nmtoken (S? '|' S? Nmtoken)* S? ')'
 *
 * [ VC: Enumeration ]
 * Values of this type must match one of the Nmtoken tokens in
 * the declaration
 *
 * Returns: the enumeration attribute tree built while parsing
 */

xmlEnumerationPtr
xmlParseEnumerationType(xmlParserCtxtPtr ctxt) {
    xmlChar *name;
    xmlEnumerationPtr ret = NULL, last = NULL, cur, tmp;

    if (RAW != '(') {
        xmlFatalErr(ctxt, XML_ERR_ATTLIST_NOT_STARTED, NULL);
        return(NULL);
    }
    SHRINK;
    do {
        NEXT;
        SKIP_BLANKS;
        name = xmlParseNmtoken(ctxt);
        if (name == NULL) {
            xmlFatalErr(ctxt, XML_ERR_NMTOKEN_REQUIRED, NULL);
            return(ret);
        }
        tmp = ret;
        while (tmp != NULL) {
            if (xmlStrEqual(name, tmp->name)) {
                xmlValidityError(ctxt, XML_DTD_DUP_TOKEN,
          "standalone: attribute enumeration value token %s duplicated\n",
                                 name, NULL);
                if (!xmlDictOwns(ctxt->dict, name))
                    xmlFree(name);
                break;
            }
            tmp = tmp->next;
        }
        if (tmp == NULL) {
            cur = xmlCreateEnumeration(name);
            if (!xmlDictOwns(ctxt->dict, name))
                xmlFree(name);
            if (cur == NULL) {
                xmlFreeEnumeration(ret);
                return(NULL);
            }
            if (last == NULL) ret = last = cur;
            else {
                last->next = cur;
                last = cur;
            }
        }
        SKIP_BLANKS;
    } while (RAW == '|');
    if (RAW != ')') {
        xmlFatalErr(ctxt, XML_ERR_ATTLIST_NOT_FINISHED, NULL);
        return(ret);
    }
    NEXT;
    return(ret);
}

/**
 * xmlParseEnumeratedType:
 * @ctxt:  an XML parser context
 * @tree:  the enumeration tree built while parsing
 *
 * parse an Enumerated attribute type.
 *
 * [57] EnumeratedType ::= NotationType | Enumeration
 *
 * [58] NotationType ::= 'NOTATION' S '(' S? Name (S? '|' S? Name)* S? ')'
 *
 *
 * Returns: XML_ATTRIBUTE_ENUMERATION or XML_ATTRIBUTE_NOTATION
 */

int
xmlParseEnumeratedType(xmlParserCtxtPtr ctxt, xmlEnumerationPtr *tree) {
    if (CMP8(CUR_PTR, 'N', 'O', 'T', 'A', 'T', 'I', 'O', 'N')) {
        SKIP(8);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after 'NOTATION'\n");
            return(0);
        }
        *tree = xmlParseNotationType(ctxt);
        if (*tree == NULL) return(0);
        return(XML_ATTRIBUTE_NOTATION);
    }
    *tree = xmlParseEnumerationType(ctxt);
    if (*tree == NULL) return(0);
    return(XML_ATTRIBUTE_ENUMERATION);
}

/**
 * xmlParseAttributeType:
 * @ctxt:  an XML parser context
 * @tree:  the enumeration tree built while parsing
 *
 * parse the Attribute list def for an element
 *
 * [54] AttType ::= StringType | TokenizedType | EnumeratedType
 *
 * [55] StringType ::= 'CDATA'
 *
 * [56] TokenizedType ::= 'ID' | 'IDREF' | 'IDREFS' | 'ENTITY' |
 *                        'ENTITIES' | 'NMTOKEN' | 'NMTOKENS'
 *
 * Validity constraints for attribute values syntax are checked in
 * xmlValidateAttributeValue()
 *
 * [ VC: ID ]
 * Values of type ID must match the Name production. A name must not
 * appear more than once in an XML document as a value of this type;
 * i.e., ID values must uniquely identify the elements which bear them.
 *
 * [ VC: One ID per Element Type ]
 * No element type may have more than one ID attribute specified.
 *
 * [ VC: ID Attribute Default ]
 * An ID attribute must have a declared default of #IMPLIED or #REQUIRED.
 *
 * [ VC: IDREF ]
 * Values of type IDREF must match the Name production, and values
 * of type IDREFS must match Names; each IDREF Name must match the value
 * of an ID attribute on some element in the XML document; i.e. IDREF
 * values must match the value of some ID attribute.
 *
 * [ VC: Entity Name ]
 * Values of type ENTITY must match the Name production, values
 * of type ENTITIES must match Names; each Entity Name must match the
 * name of an unparsed entity declared in the DTD.
 *
 * [ VC: Name Token ]
 * Values of type NMTOKEN must match the Nmtoken production; values
 * of type NMTOKENS must match Nmtokens.
 *
 * Returns the attribute type
 */
int
xmlParseAttributeType(xmlParserCtxtPtr ctxt, xmlEnumerationPtr *tree) {
    SHRINK;
    if (CMP5(CUR_PTR, 'C', 'D', 'A', 'T', 'A')) {
        SKIP(5);
        return(XML_ATTRIBUTE_CDATA);
     } else if (CMP6(CUR_PTR, 'I', 'D', 'R', 'E', 'F', 'S')) {
        SKIP(6);
        return(XML_ATTRIBUTE_IDREFS);
     } else if (CMP5(CUR_PTR, 'I', 'D', 'R', 'E', 'F')) {
        SKIP(5);
        return(XML_ATTRIBUTE_IDREF);
     } else if ((RAW == 'I') && (NXT(1) == 'D')) {
        SKIP(2);
        return(XML_ATTRIBUTE_ID);
     } else if (CMP6(CUR_PTR, 'E', 'N', 'T', 'I', 'T', 'Y')) {
        SKIP(6);
        return(XML_ATTRIBUTE_ENTITY);
     } else if (CMP8(CUR_PTR, 'E', 'N', 'T', 'I', 'T', 'I', 'E', 'S')) {
        SKIP(8);
        return(XML_ATTRIBUTE_ENTITIES);
     } else if (CMP8(CUR_PTR, 'N', 'M', 'T', 'O', 'K', 'E', 'N', 'S')) {
        SKIP(8);
        return(XML_ATTRIBUTE_NMTOKENS);
     } else if (CMP7(CUR_PTR, 'N', 'M', 'T', 'O', 'K', 'E', 'N')) {
        SKIP(7);
        return(XML_ATTRIBUTE_NMTOKEN);
     }
     return(xmlParseEnumeratedType(ctxt, tree));
}

/**
 * xmlParseAttributeListDecl:
 * @ctxt:  an XML parser context
 *
 * : parse the Attribute list def for an element
 *
 * [52] AttlistDecl ::= '<!ATTLIST' S Name AttDef* S? '>'
 *
 * [53] AttDef ::= S Name S AttType S DefaultDecl
 *
 */
void
xmlParseAttributeListDecl(xmlParserCtxtPtr ctxt) {
    const xmlChar *elemName;
    const xmlChar *attrName;
    xmlEnumerationPtr tree;

    if (CMP9(CUR_PTR, '<', '!', 'A', 'T', 'T', 'L', 'I', 'S', 'T')) {
        int inputid = ctxt->input->id;

        SKIP(9);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                                 "Space required after '<!ATTLIST'\n");
        }
        elemName = xmlParseName(ctxt);
        if (elemName == NULL) {
            xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                           "ATTLIST: no name for Element\n");
            return;
        }
        SKIP_BLANKS;
        GROW;
        while ((RAW != '>') && (ctxt->instate != XML_PARSER_EOF)) {
            int type;
            int def;
            xmlChar *defaultValue = NULL;

            GROW;
            tree = NULL;
            attrName = xmlParseName(ctxt);
            if (attrName == NULL) {
                xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                               "ATTLIST: no name for Attribute\n");
                break;
            }
            GROW;
            if (SKIP_BLANKS == 0) {
                xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                        "Space required after the attribute name\n");
                break;
            }

            type = xmlParseAttributeType(ctxt, &tree);
            if (type <= 0) {
                break;
            }

            GROW;
            if (SKIP_BLANKS == 0) {
                xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                               "Space required after the attribute type\n");
                if (tree != NULL)
                    xmlFreeEnumeration(tree);
                break;
            }

            def = xmlParseDefaultDecl(ctxt, &defaultValue);
            if (def <= 0) {
                if (defaultValue != NULL)
                    xmlFree(defaultValue);
                if (tree != NULL)
                    xmlFreeEnumeration(tree);
                break;
            }
            if ((type != XML_ATTRIBUTE_CDATA) && (defaultValue != NULL))
                xmlAttrNormalizeSpace(defaultValue, defaultValue);

            GROW;
            if (RAW != '>') {
                if (SKIP_BLANKS == 0) {
                    xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                        "Space required after the attribute default value\n");
                    if (defaultValue != NULL)
                        xmlFree(defaultValue);
                    if (tree != NULL)
                        xmlFreeEnumeration(tree);
                    break;
                }
            }
            if ((ctxt->sax != NULL) && (!ctxt->disableSAX) &&
                (ctxt->sax->attributeDecl != NULL))
                ctxt->sax->attributeDecl(ctxt->userData, elemName, attrName,
                                type, def, defaultValue, tree);
            else if (tree != NULL)
                xmlFreeEnumeration(tree);

            if ((ctxt->sax2) && (defaultValue != NULL) &&
                (def != XML_ATTRIBUTE_IMPLIED) &&
                (def != XML_ATTRIBUTE_REQUIRED)) {
                xmlAddDefAttrs(ctxt, elemName, attrName, defaultValue);
            }
            if (ctxt->sax2) {
                xmlAddSpecialAttr(ctxt, elemName, attrName, type);
            }
            if (defaultValue != NULL)
                xmlFree(defaultValue);
            GROW;
        }
        if (RAW == '>') {
            if (inputid != ctxt->input->id) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "Attribute list declaration doesn't start and"
                               " stop in the same entity\n");
            }
            NEXT;
        }
    }
}

/**
 * xmlParseElementMixedContentDecl:
 * @ctxt:  an XML parser context
 * @inputchk:  the input used for the current entity, needed for boundary checks
 *
 * parse the declaration for a Mixed Element content
 * The leading '(' and spaces have been skipped in xmlParseElementContentDecl
 *
 * [51] Mixed ::= '(' S? '#PCDATA' (S? '|' S? Name)* S? ')*' |
 *                '(' S? '#PCDATA' S? ')'
 *
 * [ VC: Proper Group/PE Nesting ] applies to [51] too (see [49])
 *
 * [ VC: No Duplicate Types ]
 * The same name must not appear more than once in a single
 * mixed-content declaration.
 *
 * returns: the list of the xmlElementContentPtr describing the element choices
 */
xmlElementContentPtr
xmlParseElementMixedContentDecl(xmlParserCtxtPtr ctxt, int inputchk) {
    xmlElementContentPtr ret = NULL, cur = NULL, n;
    const xmlChar *elem = NULL;

    GROW;
    if (CMP7(CUR_PTR, '#', 'P', 'C', 'D', 'A', 'T', 'A')) {
        SKIP(7);
        SKIP_BLANKS;
        SHRINK;
        if (RAW == ')') {
            if (ctxt->input->id != inputchk) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "Element content declaration doesn't start and"
                               " stop in the same entity\n");
            }
            NEXT;
            ret = xmlNewDocElementContent(ctxt->myDoc, NULL, XML_ELEMENT_CONTENT_PCDATA);
            if (ret == NULL)
                return(NULL);
            if (RAW == '*') {
                ret->ocur = XML_ELEMENT_CONTENT_MULT;
                NEXT;
            }
            return(ret);
        }
        if ((RAW == '(') || (RAW == '|')) {
            ret = cur = xmlNewDocElementContent(ctxt->myDoc, NULL, XML_ELEMENT_CONTENT_PCDATA);
            if (ret == NULL) return(NULL);
        }
        while ((RAW == '|') && (ctxt->instate != XML_PARSER_EOF)) {
            NEXT;
            if (elem == NULL) {
                ret = xmlNewDocElementContent(ctxt->myDoc, NULL, XML_ELEMENT_CONTENT_OR);
                if (ret == NULL) {
                    xmlFreeDocElementContent(ctxt->myDoc, cur);
                    return(NULL);
                }
                ret->c1 = cur;
                if (cur != NULL)
                    cur->parent = ret;
                cur = ret;
            } else {
                n = xmlNewDocElementContent(ctxt->myDoc, NULL, XML_ELEMENT_CONTENT_OR);
                if (n == NULL) {
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                    return(NULL);
                }
                n->c1 = xmlNewDocElementContent(ctxt->myDoc, elem, XML_ELEMENT_CONTENT_ELEMENT);
                if (n->c1 != NULL)
                    n->c1->parent = n;
                cur->c2 = n;
                if (n != NULL)
                    n->parent = cur;
                cur = n;
            }
            SKIP_BLANKS;
            elem = xmlParseName(ctxt);
            if (elem == NULL) {
                xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                        "xmlParseElementMixedContentDecl : Name expected\n");
                xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            SKIP_BLANKS;
            GROW;
        }
        if ((RAW == ')') && (NXT(1) == '*')) {
            if (elem != NULL) {
                cur->c2 = xmlNewDocElementContent(ctxt->myDoc, elem,
                                               XML_ELEMENT_CONTENT_ELEMENT);
                if (cur->c2 != NULL)
                    cur->c2->parent = cur;
            }
            if (ret != NULL)
                ret->ocur = XML_ELEMENT_CONTENT_MULT;
            if (ctxt->input->id != inputchk) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "Element content declaration doesn't start and"
                               " stop in the same entity\n");
            }
            SKIP(2);
        } else {
            xmlFreeDocElementContent(ctxt->myDoc, ret);
            xmlFatalErr(ctxt, XML_ERR_MIXED_NOT_STARTED, NULL);
            return(NULL);
        }

    } else {
        xmlFatalErr(ctxt, XML_ERR_PCDATA_REQUIRED, NULL);
    }
    return(ret);
}

/**
 * xmlParseElementChildrenContentDeclPriv:
 * @ctxt:  an XML parser context
 * @inputchk:  the input used for the current entity, needed for boundary checks
 * @depth: the level of recursion
 *
 * parse the declaration for a Mixed Element content
 * The leading '(' and spaces have been skipped in xmlParseElementContentDecl
 *
 *
 * [47] children ::= (choice | seq) ('?' | '*' | '+')?
 *
 * [48] cp ::= (Name | choice | seq) ('?' | '*' | '+')?
 *
 * [49] choice ::= '(' S? cp ( S? '|' S? cp )* S? ')'
 *
 * [50] seq ::= '(' S? cp ( S? ',' S? cp )* S? ')'
 *
 * [ VC: Proper Group/PE Nesting ] applies to [49] and [50]
 * TODO Parameter-entity replacement text must be properly nested
 *      with parenthesized groups. That is to say, if either of the
 *      opening or closing parentheses in a choice, seq, or Mixed
 *      construct is contained in the replacement text for a parameter
 *      entity, both must be contained in the same replacement text. For
 *      interoperability, if a parameter-entity reference appears in a
 *      choice, seq, or Mixed construct, its replacement text should not
 *      be empty, and neither the first nor last non-blank character of
 *      the replacement text should be a connector (| or ,).
 *
 * Returns the tree of xmlElementContentPtr describing the element
 *          hierarchy.
 */
static xmlElementContentPtr
xmlParseElementChildrenContentDeclPriv(xmlParserCtxtPtr ctxt, int inputchk,
                                       int depth) {
    xmlElementContentPtr ret = NULL, cur = NULL, last = NULL, op = NULL;
    const xmlChar *elem;
    xmlChar type = 0;

    if (((depth > 128) && ((ctxt->options & XML_PARSE_HUGE) == 0)) ||
        (depth >  2048)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_ELEMCONTENT_NOT_FINISHED,
"xmlParseElementChildrenContentDecl : depth %d too deep, use XML_PARSE_HUGE\n",
                          depth);
        return(NULL);
    }
    SKIP_BLANKS;
    GROW;
    if (RAW == '(') {
        int inputid = ctxt->input->id;

        /* Recurse on first child */
        NEXT;
        SKIP_BLANKS;
        cur = ret = xmlParseElementChildrenContentDeclPriv(ctxt, inputid,
                                                           depth + 1);
        if (cur == NULL)
            return(NULL);
        SKIP_BLANKS;
        GROW;
    } else {
        elem = xmlParseName(ctxt);
        if (elem == NULL) {
            xmlFatalErr(ctxt, XML_ERR_ELEMCONTENT_NOT_STARTED, NULL);
            return(NULL);
        }
        cur = ret = xmlNewDocElementContent(ctxt->myDoc, elem, XML_ELEMENT_CONTENT_ELEMENT);
        if (cur == NULL) {
            xmlErrMemory(ctxt, NULL);
            return(NULL);
        }
        GROW;
        if (RAW == '?') {
            cur->ocur = XML_ELEMENT_CONTENT_OPT;
            NEXT;
        } else if (RAW == '*') {
            cur->ocur = XML_ELEMENT_CONTENT_MULT;
            NEXT;
        } else if (RAW == '+') {
            cur->ocur = XML_ELEMENT_CONTENT_PLUS;
            NEXT;
        } else {
            cur->ocur = XML_ELEMENT_CONTENT_ONCE;
        }
        GROW;
    }
    SKIP_BLANKS;
    SHRINK;
    while ((RAW != ')') && (ctxt->instate != XML_PARSER_EOF)) {
        /*
         * Each loop we parse one separator and one element.
         */
        if (RAW == ',') {
            if (type == 0) type = CUR;

            /*
             * Detect "Name | Name , Name" error
             */
            else if (type != CUR) {
                xmlFatalErrMsgInt(ctxt, XML_ERR_SEPARATOR_REQUIRED,
                    "xmlParseElementChildrenContentDecl : '%c' expected\n",
                                  type);
                if ((last != NULL) && (last != ret))
                    xmlFreeDocElementContent(ctxt->myDoc, last);
                if (ret != NULL)
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            NEXT;

            op = xmlNewDocElementContent(ctxt->myDoc, NULL, XML_ELEMENT_CONTENT_SEQ);
            if (op == NULL) {
                if ((last != NULL) && (last != ret))
                    xmlFreeDocElementContent(ctxt->myDoc, last);
                xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            if (last == NULL) {
                op->c1 = ret;
                if (ret != NULL)
                    ret->parent = op;
                ret = cur = op;
            } else {
                cur->c2 = op;
                if (op != NULL)
                    op->parent = cur;
                op->c1 = last;
                if (last != NULL)
                    last->parent = op;
                cur =op;
                last = NULL;
            }
        } else if (RAW == '|') {
            if (type == 0) type = CUR;

            /*
             * Detect "Name , Name | Name" error
             */
            else if (type != CUR) {
                xmlFatalErrMsgInt(ctxt, XML_ERR_SEPARATOR_REQUIRED,
                    "xmlParseElementChildrenContentDecl : '%c' expected\n",
                                  type);
                if ((last != NULL) && (last != ret))
                    xmlFreeDocElementContent(ctxt->myDoc, last);
                if (ret != NULL)
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            NEXT;

            op = xmlNewDocElementContent(ctxt->myDoc, NULL, XML_ELEMENT_CONTENT_OR);
            if (op == NULL) {
                if ((last != NULL) && (last != ret))
                    xmlFreeDocElementContent(ctxt->myDoc, last);
                if (ret != NULL)
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            if (last == NULL) {
                op->c1 = ret;
                if (ret != NULL)
                    ret->parent = op;
                ret = cur = op;
            } else {
                cur->c2 = op;
                if (op != NULL)
                    op->parent = cur;
                op->c1 = last;
                if (last != NULL)
                    last->parent = op;
                cur =op;
                last = NULL;
            }
        } else {
            xmlFatalErr(ctxt, XML_ERR_ELEMCONTENT_NOT_FINISHED, NULL);
            if ((last != NULL) && (last != ret))
                xmlFreeDocElementContent(ctxt->myDoc, last);
            if (ret != NULL)
                xmlFreeDocElementContent(ctxt->myDoc, ret);
            return(NULL);
        }
        GROW;
        SKIP_BLANKS;
        GROW;
        if (RAW == '(') {
            int inputid = ctxt->input->id;
            /* Recurse on second child */
            NEXT;
            SKIP_BLANKS;
            last = xmlParseElementChildrenContentDeclPriv(ctxt, inputid,
                                                          depth + 1);
            if (last == NULL) {
                if (ret != NULL)
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            SKIP_BLANKS;
        } else {
            elem = xmlParseName(ctxt);
            if (elem == NULL) {
                xmlFatalErr(ctxt, XML_ERR_ELEMCONTENT_NOT_STARTED, NULL);
                if (ret != NULL)
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            last = xmlNewDocElementContent(ctxt->myDoc, elem, XML_ELEMENT_CONTENT_ELEMENT);
            if (last == NULL) {
                if (ret != NULL)
                    xmlFreeDocElementContent(ctxt->myDoc, ret);
                return(NULL);
            }
            if (RAW == '?') {
                last->ocur = XML_ELEMENT_CONTENT_OPT;
                NEXT;
            } else if (RAW == '*') {
                last->ocur = XML_ELEMENT_CONTENT_MULT;
                NEXT;
            } else if (RAW == '+') {
                last->ocur = XML_ELEMENT_CONTENT_PLUS;
                NEXT;
            } else {
                last->ocur = XML_ELEMENT_CONTENT_ONCE;
            }
        }
        SKIP_BLANKS;
        GROW;
    }
    if ((cur != NULL) && (last != NULL)) {
        cur->c2 = last;
        if (last != NULL)
            last->parent = cur;
    }
    if (ctxt->input->id != inputchk) {
        xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                       "Element content declaration doesn't start and stop in"
                       " the same entity\n");
    }
    NEXT;
    if (RAW == '?') {
        if (ret != NULL) {
            if ((ret->ocur == XML_ELEMENT_CONTENT_PLUS) ||
                (ret->ocur == XML_ELEMENT_CONTENT_MULT))
                ret->ocur = XML_ELEMENT_CONTENT_MULT;
            else
                ret->ocur = XML_ELEMENT_CONTENT_OPT;
        }
        NEXT;
    } else if (RAW == '*') {
        if (ret != NULL) {
            ret->ocur = XML_ELEMENT_CONTENT_MULT;
            cur = ret;
            /*
             * Some normalization:
             * (a | b* | c?)* == (a | b | c)*
             */
            while ((cur != NULL) && (cur->type == XML_ELEMENT_CONTENT_OR)) {
                if ((cur->c1 != NULL) &&
                    ((cur->c1->ocur == XML_ELEMENT_CONTENT_OPT) ||
                     (cur->c1->ocur == XML_ELEMENT_CONTENT_MULT)))
                    cur->c1->ocur = XML_ELEMENT_CONTENT_ONCE;
                if ((cur->c2 != NULL) &&
                    ((cur->c2->ocur == XML_ELEMENT_CONTENT_OPT) ||
                     (cur->c2->ocur == XML_ELEMENT_CONTENT_MULT)))
                    cur->c2->ocur = XML_ELEMENT_CONTENT_ONCE;
                cur = cur->c2;
            }
        }
        NEXT;
    } else if (RAW == '+') {
        if (ret != NULL) {
            int found = 0;

            if ((ret->ocur == XML_ELEMENT_CONTENT_OPT) ||
                (ret->ocur == XML_ELEMENT_CONTENT_MULT))
                ret->ocur = XML_ELEMENT_CONTENT_MULT;
            else
                ret->ocur = XML_ELEMENT_CONTENT_PLUS;
            /*
             * Some normalization:
             * (a | b*)+ == (a | b)*
             * (a | b?)+ == (a | b)*
             */
            while ((cur != NULL) && (cur->type == XML_ELEMENT_CONTENT_OR)) {
                if ((cur->c1 != NULL) &&
                    ((cur->c1->ocur == XML_ELEMENT_CONTENT_OPT) ||
                     (cur->c1->ocur == XML_ELEMENT_CONTENT_MULT))) {
                    cur->c1->ocur = XML_ELEMENT_CONTENT_ONCE;
                    found = 1;
                }
                if ((cur->c2 != NULL) &&
                    ((cur->c2->ocur == XML_ELEMENT_CONTENT_OPT) ||
                     (cur->c2->ocur == XML_ELEMENT_CONTENT_MULT))) {
                    cur->c2->ocur = XML_ELEMENT_CONTENT_ONCE;
                    found = 1;
                }
                cur = cur->c2;
            }
            if (found)
                ret->ocur = XML_ELEMENT_CONTENT_MULT;
        }
        NEXT;
    }
    return(ret);
}

/**
 * xmlParseElementChildrenContentDecl:
 * @ctxt:  an XML parser context
 * @inputchk:  the input used for the current entity, needed for boundary checks
 *
 * parse the declaration for a Mixed Element content
 * The leading '(' and spaces have been skipped in xmlParseElementContentDecl
 *
 * [47] children ::= (choice | seq) ('?' | '*' | '+')?
 *
 * [48] cp ::= (Name | choice | seq) ('?' | '*' | '+')?
 *
 * [49] choice ::= '(' S? cp ( S? '|' S? cp )* S? ')'
 *
 * [50] seq ::= '(' S? cp ( S? ',' S? cp )* S? ')'
 *
 * [ VC: Proper Group/PE Nesting ] applies to [49] and [50]
 * TODO Parameter-entity replacement text must be properly nested
 *      with parenthesized groups. That is to say, if either of the
 *      opening or closing parentheses in a choice, seq, or Mixed
 *      construct is contained in the replacement text for a parameter
 *      entity, both must be contained in the same replacement text. For
 *      interoperability, if a parameter-entity reference appears in a
 *      choice, seq, or Mixed construct, its replacement text should not
 *      be empty, and neither the first nor last non-blank character of
 *      the replacement text should be a connector (| or ,).
 *
 * Returns the tree of xmlElementContentPtr describing the element
 *          hierarchy.
 */
xmlElementContentPtr
xmlParseElementChildrenContentDecl(xmlParserCtxtPtr ctxt, int inputchk) {
    /* stub left for API/ABI compat */
    return(xmlParseElementChildrenContentDeclPriv(ctxt, inputchk, 1));
}

/**
 * xmlParseElementContentDecl:
 * @ctxt:  an XML parser context
 * @name:  the name of the element being defined.
 * @result:  the Element Content pointer will be stored here if any
 *
 * parse the declaration for an Element content either Mixed or Children,
 * the cases EMPTY and ANY are handled directly in xmlParseElementDecl
 *
 * [46] contentspec ::= 'EMPTY' | 'ANY' | Mixed | children
 *
 * returns: the type of element content XML_ELEMENT_TYPE_xxx
 */

int
xmlParseElementContentDecl(xmlParserCtxtPtr ctxt, const xmlChar *name,
                           xmlElementContentPtr *result) {

    xmlElementContentPtr tree = NULL;
    int inputid = ctxt->input->id;
    int res;

    *result = NULL;

    if (RAW != '(') {
        xmlFatalErrMsgStr(ctxt, XML_ERR_ELEMCONTENT_NOT_STARTED,
                "xmlParseElementContentDecl : %s '(' expected\n", name);
        return(-1);
    }
    NEXT;
    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);
    SKIP_BLANKS;
    if (CMP7(CUR_PTR, '#', 'P', 'C', 'D', 'A', 'T', 'A')) {
        tree = xmlParseElementMixedContentDecl(ctxt, inputid);
        res = XML_ELEMENT_TYPE_MIXED;
    } else {
        tree = xmlParseElementChildrenContentDeclPriv(ctxt, inputid, 1);
        res = XML_ELEMENT_TYPE_ELEMENT;
    }
    SKIP_BLANKS;
    *result = tree;
    return(res);
}

/**
 * xmlParseElementDecl:
 * @ctxt:  an XML parser context
 *
 * parse an Element declaration.
 *
 * [45] elementdecl ::= '<!ELEMENT' S Name S contentspec S? '>'
 *
 * [ VC: Unique Element Type Declaration ]
 * No element type may be declared more than once
 *
 * Returns the type of the element, or -1 in case of error
 */
int
xmlParseElementDecl(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;
    int ret = -1;
    xmlElementContentPtr content  = NULL;

    /* GROW; done in the caller */
    if (CMP9(CUR_PTR, '<', '!', 'E', 'L', 'E', 'M', 'E', 'N', 'T')) {
        int inputid = ctxt->input->id;

        SKIP(9);
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after 'ELEMENT'\n");
            return(-1);
        }
        name = xmlParseName(ctxt);
        if (name == NULL) {
            xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                           "xmlParseElementDecl: no name for Element\n");
            return(-1);
        }
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space required after the element name\n");
        }
        if (CMP5(CUR_PTR, 'E', 'M', 'P', 'T', 'Y')) {
            SKIP(5);
            /*
             * Element must always be empty.
             */
            ret = XML_ELEMENT_TYPE_EMPTY;
        } else if ((RAW == 'A') && (NXT(1) == 'N') &&
                   (NXT(2) == 'Y')) {
            SKIP(3);
            /*
             * Element is a generic container.
             */
            ret = XML_ELEMENT_TYPE_ANY;
        } else if (RAW == '(') {
            ret = xmlParseElementContentDecl(ctxt, name, &content);
        } else {
            /*
             * [ WFC: PEs in Internal Subset ] error handling.
             */
            if ((RAW == '%') && (ctxt->external == 0) &&
                (ctxt->inputNr == 1)) {
                xmlFatalErrMsg(ctxt, XML_ERR_PEREF_IN_INT_SUBSET,
          "PEReference: forbidden within markup decl in internal subset\n");
            } else {
                xmlFatalErrMsg(ctxt, XML_ERR_ELEMCONTENT_NOT_STARTED,
                      "xmlParseElementDecl: 'EMPTY', 'ANY' or '(' expected\n");
            }
            return(-1);
        }

        SKIP_BLANKS;

        if (RAW != '>') {
            xmlFatalErr(ctxt, XML_ERR_GT_REQUIRED, NULL);
            if (content != NULL) {
                xmlFreeDocElementContent(ctxt->myDoc, content);
            }
        } else {
            if (inputid != ctxt->input->id) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "Element declaration doesn't start and stop in"
                               " the same entity\n");
            }

            NEXT;
            if ((ctxt->sax != NULL) && (!ctxt->disableSAX) &&
                (ctxt->sax->elementDecl != NULL)) {
                if (content != NULL)
                    content->parent = NULL;
                ctxt->sax->elementDecl(ctxt->userData, name, ret,
                                       content);
                if ((content != NULL) && (content->parent == NULL)) {
                    /*
                     * this is a trick: if xmlAddElementDecl is called,
                     * instead of copying the full tree it is plugged directly
                     * if called from the parser. Avoid duplicating the
                     * interfaces or change the API/ABI
                     */
                    xmlFreeDocElementContent(ctxt->myDoc, content);
                }
            } else if (content != NULL) {
                xmlFreeDocElementContent(ctxt->myDoc, content);
            }
        }
    }
    return(ret);
}

/**
 * xmlParseConditionalSections
 * @ctxt:  an XML parser context
 *
 * [61] conditionalSect ::= includeSect | ignoreSect
 * [62] includeSect ::= '<![' S? 'INCLUDE' S? '[' extSubsetDecl ']]>'
 * [63] ignoreSect ::= '<![' S? 'IGNORE' S? '[' ignoreSectContents* ']]>'
 * [64] ignoreSectContents ::= Ignore ('<![' ignoreSectContents ']]>' Ignore)*
 * [65] Ignore ::= Char* - (Char* ('<![' | ']]>') Char*)
 */

static void
xmlParseConditionalSections(xmlParserCtxtPtr ctxt) {
    int *inputIds = NULL;
    size_t inputIdsSize = 0;
    size_t depth = 0;

    while (ctxt->instate != XML_PARSER_EOF) {
        if ((RAW == '<') && (NXT(1) == '!') && (NXT(2) == '[')) {
            int id = ctxt->input->id;

            SKIP(3);
            SKIP_BLANKS;

            if (CMP7(CUR_PTR, 'I', 'N', 'C', 'L', 'U', 'D', 'E')) {
                SKIP(7);
                SKIP_BLANKS;
                if (RAW != '[') {
                    xmlFatalErr(ctxt, XML_ERR_CONDSEC_INVALID, NULL);
                    xmlHaltParser(ctxt);
                    goto error;
                }
                if (ctxt->input->id != id) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                                   "All markup of the conditional section is"
                                   " not in the same entity\n");
                }
                NEXT;

                if (inputIdsSize <= depth) {
                    int *tmp;

                    inputIdsSize = (inputIdsSize == 0 ? 4 : inputIdsSize * 2);
                    tmp = (int *) xmlRealloc(inputIds,
                            inputIdsSize * sizeof(int));
                    if (tmp == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        goto error;
                    }
                    inputIds = tmp;
                }
                inputIds[depth] = id;
                depth++;
            } else if (CMP6(CUR_PTR, 'I', 'G', 'N', 'O', 'R', 'E')) {
                int state;
                xmlParserInputState instate;
                size_t ignoreDepth = 0;

                SKIP(6);
                SKIP_BLANKS;
                if (RAW != '[') {
                    xmlFatalErr(ctxt, XML_ERR_CONDSEC_INVALID, NULL);
                    xmlHaltParser(ctxt);
                    goto error;
                }
                if (ctxt->input->id != id) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                                   "All markup of the conditional section is"
                                   " not in the same entity\n");
                }
                NEXT;

                /*
                 * Parse up to the end of the conditional section but disable
                 * SAX event generating DTD building in the meantime
                 */
                state = ctxt->disableSAX;
                instate = ctxt->instate;
                if (ctxt->recovery == 0) ctxt->disableSAX = 1;
                ctxt->instate = XML_PARSER_IGNORE;

                while (RAW != 0) {
                    if ((RAW == '<') && (NXT(1) == '!') && (NXT(2) == '[')) {
                        SKIP(3);
                        ignoreDepth++;
                        /* Check for integer overflow */
                        if (ignoreDepth == 0) {
                            xmlErrMemory(ctxt, NULL);
                            goto error;
                        }
                    } else if ((RAW == ']') && (NXT(1) == ']') &&
                               (NXT(2) == '>')) {
                        if (ignoreDepth == 0)
                            break;
                        SKIP(3);
                        ignoreDepth--;
                    } else {
                        NEXT;
                    }
                }

                ctxt->disableSAX = state;
                ctxt->instate = instate;

                if (RAW == 0) {
                    xmlFatalErr(ctxt, XML_ERR_CONDSEC_NOT_FINISHED, NULL);
                    goto error;
                }
                if (ctxt->input->id != id) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                                   "All markup of the conditional section is"
                                   " not in the same entity\n");
                }
                SKIP(3);
            } else {
                xmlFatalErr(ctxt, XML_ERR_CONDSEC_INVALID_KEYWORD, NULL);
                xmlHaltParser(ctxt);
                goto error;
            }
        } else if ((depth > 0) &&
                   (RAW == ']') && (NXT(1) == ']') && (NXT(2) == '>')) {
            depth--;
            if (ctxt->input->id != inputIds[depth]) {
                xmlFatalErrMsg(ctxt, XML_ERR_ENTITY_BOUNDARY,
                               "All markup of the conditional section is not"
                               " in the same entity\n");
            }
            SKIP(3);
        } else {
            int id = ctxt->input->id;
            unsigned long cons = CUR_CONSUMED;

            xmlParseMarkupDecl(ctxt);

            if ((id == ctxt->input->id) && (cons == CUR_CONSUMED)) {
                xmlFatalErr(ctxt, XML_ERR_EXT_SUBSET_NOT_FINISHED, NULL);
                xmlHaltParser(ctxt);
                goto error;
            }
        }

        if (depth == 0)
            break;

        SKIP_BLANKS;
        GROW;
    }

error:
    xmlFree(inputIds);
}

/**
 * xmlParseMarkupDecl:
 * @ctxt:  an XML parser context
 *
 * parse Markup declarations
 *
 * [29] markupdecl ::= elementdecl | AttlistDecl | EntityDecl |
 *                     NotationDecl | PI | Comment
 *
 * [ VC: Proper Declaration/PE Nesting ]
 * Parameter-entity replacement text must be properly nested with
 * markup declarations. That is to say, if either the first character
 * or the last character of a markup declaration (markupdecl above) is
 * contained in the replacement text for a parameter-entity reference,
 * both must be contained in the same replacement text.
 *
 * [ WFC: PEs in Internal Subset ]
 * In the internal DTD subset, parameter-entity references can occur
 * only where markup declarations can occur, not within markup declarations.
 * (This does not apply to references that occur in external parameter
 * entities or to the external subset.)
 */
void
xmlParseMarkupDecl(xmlParserCtxtPtr ctxt) {
    GROW;
    if (CUR == '<') {
        if (NXT(1) == '!') {
            switch (NXT(2)) {
                case 'E':
                    if (NXT(3) == 'L')
                        xmlParseElementDecl(ctxt);
                    else if (NXT(3) == 'N')
                        xmlParseEntityDecl(ctxt);
                    break;
                case 'A':
                    xmlParseAttributeListDecl(ctxt);
                    break;
                case 'N':
                    xmlParseNotationDecl(ctxt);
                    break;
                case '-':
                    xmlParseComment(ctxt);
                    break;
                default:
                    /* there is an error but it will be detected later */
                    break;
            }
        } else if (NXT(1) == '?') {
            xmlParsePI(ctxt);
        }
    }

    /*
     * detect requirement to exit there and act accordingly
     * and avoid having instate overridden later on
     */
    if (ctxt->instate == XML_PARSER_EOF)
        return;

    ctxt->instate = XML_PARSER_DTD;
}

/**
 * xmlParseTextDecl:
 * @ctxt:  an XML parser context
 *
 * parse an XML declaration header for external entities
 *
 * [77] TextDecl ::= '<?xml' VersionInfo? EncodingDecl S? '?>'
 */

void
xmlParseTextDecl(xmlParserCtxtPtr ctxt) {
    xmlChar *version;
    const xmlChar *encoding;
    int oldstate;

    /*
     * We know that '<?xml' is here.
     */
    if ((CMP5(CUR_PTR, '<', '?', 'x', 'm', 'l')) && (IS_BLANK_CH(NXT(5)))) {
        SKIP(5);
    } else {
        xmlFatalErr(ctxt, XML_ERR_XMLDECL_NOT_STARTED, NULL);
        return;
    }

    /* Avoid expansion of parameter entities when skipping blanks. */
    oldstate = ctxt->instate;
    ctxt->instate = XML_PARSER_START;

    if (SKIP_BLANKS == 0) {
        xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                       "Space needed after '<?xml'\n");
    }

    /*
     * We may have the VersionInfo here.
     */
    version = xmlParseVersionInfo(ctxt);
    if (version == NULL)
        version = xmlCharStrdup(XML_DEFAULT_VERSION);
    else {
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "Space needed here\n");
        }
    }
    ctxt->input->version = version;

    /*
     * We must have the encoding declaration
     */
    encoding = xmlParseEncodingDecl(ctxt);
    if (ctxt->errNo == XML_ERR_UNSUPPORTED_ENCODING) {
        /*
         * The XML REC instructs us to stop parsing right here
         */
        ctxt->instate = oldstate;
        return;
    }
    if ((encoding == NULL) && (ctxt->errNo == XML_ERR_OK)) {
        xmlFatalErrMsg(ctxt, XML_ERR_MISSING_ENCODING,
                       "Missing encoding in text declaration\n");
    }

    SKIP_BLANKS;
    if ((RAW == '?') && (NXT(1) == '>')) {
        SKIP(2);
    } else if (RAW == '>') {
        /* Deprecated old WD ... */
        xmlFatalErr(ctxt, XML_ERR_XMLDECL_NOT_FINISHED, NULL);
        NEXT;
    } else {
        xmlFatalErr(ctxt, XML_ERR_XMLDECL_NOT_FINISHED, NULL);
        MOVETO_ENDTAG(CUR_PTR);
        NEXT;
    }

    ctxt->instate = oldstate;
}

/**
 * xmlParseExternalSubset:
 * @ctxt:  an XML parser context
 * @ExternalID: the external identifier
 * @SystemID: the system identifier (or URL)
 *
 * parse Markup declarations from an external subset
 *
 * [30] extSubset ::= textDecl? extSubsetDecl
 *
 * [31] extSubsetDecl ::= (markupdecl | conditionalSect | PEReference | S) *
 */
void
xmlParseExternalSubset(xmlParserCtxtPtr ctxt, const xmlChar *ExternalID,
                       const xmlChar *SystemID) {
    xmlDetectSAX2(ctxt);
    GROW;

    if ((ctxt->encoding == NULL) &&
        (ctxt->input->end - ctxt->input->cur >= 4)) {
        xmlChar start[4];
        xmlCharEncoding enc;

        start[0] = RAW;
        start[1] = NXT(1);
        start[2] = NXT(2);
        start[3] = NXT(3);
        enc = xmlDetectCharEncoding(start, 4);
        if (enc != XML_CHAR_ENCODING_NONE)
            xmlSwitchEncoding(ctxt, enc);
    }

    if (CMP5(CUR_PTR, '<', '?', 'x', 'm', 'l')) {
        xmlParseTextDecl(ctxt);
        if (ctxt->errNo == XML_ERR_UNSUPPORTED_ENCODING) {
            /*
             * The XML REC instructs us to stop parsing right here
             */
            xmlHaltParser(ctxt);
            return;
        }
    }
    if (ctxt->myDoc == NULL) {
        ctxt->myDoc = xmlNewDoc(BAD_CAST "1.0");
        if (ctxt->myDoc == NULL) {
            xmlErrMemory(ctxt, "New Doc failed");
            return;
        }
        ctxt->myDoc->properties = XML_DOC_INTERNAL;
    }
    if ((ctxt->myDoc != NULL) && (ctxt->myDoc->intSubset == NULL))
        xmlCreateIntSubset(ctxt->myDoc, NULL, ExternalID, SystemID);

    ctxt->instate = XML_PARSER_DTD;
    ctxt->external = 1;
    SKIP_BLANKS;
    while (((RAW == '<') && (NXT(1) == '?')) ||
           ((RAW == '<') && (NXT(1) == '!')) ||
           (RAW == '%')) {
        int id = ctxt->input->id;
        unsigned long cons = CUR_CONSUMED;

        GROW;
        if ((RAW == '<') && (NXT(1) == '!') && (NXT(2) == '[')) {
            xmlParseConditionalSections(ctxt);
        } else
            xmlParseMarkupDecl(ctxt);
        SKIP_BLANKS;

        if ((id == ctxt->input->id) && (cons == CUR_CONSUMED)) {
            xmlFatalErr(ctxt, XML_ERR_EXT_SUBSET_NOT_FINISHED, NULL);
            break;
        }
    }

    if (RAW != 0) {
        xmlFatalErr(ctxt, XML_ERR_EXT_SUBSET_NOT_FINISHED, NULL);
    }

}

/**
 * xmlParseReference:
 * @ctxt:  an XML parser context
 *
 * parse and handle entity references in content, depending on the SAX
 * interface, this may end-up in a call to character() if this is a
 * CharRef, a predefined entity, if there is no reference() callback.
 * or if the parser was asked to switch to that mode.
 *
 * [67] Reference ::= EntityRef | CharRef
 */
void
xmlParseReference(xmlParserCtxtPtr ctxt) {
    xmlEntityPtr ent;
    xmlChar *val;
    int was_checked;
    xmlNodePtr list = NULL;
    xmlParserErrors ret = XML_ERR_OK;


    if (RAW != '&')
        return;

    /*
     * Simple case of a CharRef
     */
    if (NXT(1) == '#') {
        int i = 0;
        xmlChar out[16];
        int hex = NXT(2);
        int value = xmlParseCharRef(ctxt);

        if (value == 0)
            return;
        if (ctxt->charset != XML_CHAR_ENCODING_UTF8) {
            /*
             * So we are using non-UTF-8 buffers
             * Check that the char fit on 8bits, if not
             * generate a CharRef.
             */
            if (value <= 0xFF) {
                out[0] = value;
                out[1] = 0;
                if ((ctxt->sax != NULL) && (ctxt->sax->characters != NULL) &&
                    (!ctxt->disableSAX))
                    ctxt->sax->characters(ctxt->userData, out, 1);
            } else {
                if ((hex == 'x') || (hex == 'X'))
                    snprintf((char *)out, sizeof(out), "#x%X", value);
                else
                    snprintf((char *)out, sizeof(out), "#%d", value);
                if ((ctxt->sax != NULL) && (ctxt->sax->reference != NULL) &&
                    (!ctxt->disableSAX))
                    ctxt->sax->reference(ctxt->userData, out);
            }
        } else {
            /*
             * Just encode the value in UTF-8
             */
            COPY_BUF(0 ,out, i, value);
            out[i] = 0;
            if ((ctxt->sax != NULL) && (ctxt->sax->characters != NULL) &&
                (!ctxt->disableSAX))
                ctxt->sax->characters(ctxt->userData, out, i);
        }
        return;
    }

    /*
     * We are seeing an entity reference
     */
    ent = xmlParseEntityRef(ctxt);
    if (ent == NULL) return;
    if (!ctxt->wellFormed)
        return;
    was_checked = ent->checked;

    /* special case of predefined entities */
    if ((ent->name == NULL) ||
        (ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
        val = ent->content;
        if (val == NULL) return;
        /*
         * inline the entity.
         */
        if ((ctxt->sax != NULL) && (ctxt->sax->characters != NULL) &&
            (!ctxt->disableSAX))
            ctxt->sax->characters(ctxt->userData, val, xmlStrlen(val));
        return;
    }

    /*
     * The first reference to the entity trigger a parsing phase
     * where the ent->children is filled with the result from
     * the parsing.
     * Note: external parsed entities will not be loaded, it is not
     * required for a non-validating parser, unless the parsing option
     * of validating, or substituting entities were given. Doing so is
     * far more secure as the parser will only process data coming from
     * the document entity by default.
     */
    if (((ent->checked == 0) ||
         ((ent->children == NULL) && (ctxt->options & XML_PARSE_NOENT))) &&
        ((ent->etype != XML_EXTERNAL_GENERAL_PARSED_ENTITY) ||
         (ctxt->options & (XML_PARSE_NOENT | XML_PARSE_DTDVALID)))) {
        unsigned long oldnbent = ctxt->nbentities, diff;

        /*
         * This is a bit hackish but this seems the best
         * way to make sure both SAX and DOM entity support
         * behaves okay.
         */
        void *user_data;
        if (ctxt->userData == ctxt)
            user_data = NULL;
        else
            user_data = ctxt->userData;

        /*
         * Check that this entity is well formed
         * 4.3.2: An internal general parsed entity is well-formed
         * if its replacement text matches the production labeled
         * content.
         */
        if (ent->etype == XML_INTERNAL_GENERAL_ENTITY) {
            ctxt->depth++;
            ret = xmlParseBalancedChunkMemoryInternal(ctxt, ent->content,
                                                      user_data, &list);
            ctxt->depth--;

        } else if (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY) {
            ctxt->depth++;
            ret = xmlParseExternalEntityPrivate(ctxt->myDoc, ctxt, ctxt->sax,
                                           user_data, ctxt->depth, ent->URI,
                                           ent->ExternalID, &list);
            ctxt->depth--;
        } else {
            ret = XML_ERR_ENTITY_PE_INTERNAL;
            xmlErrMsgStr(ctxt, XML_ERR_INTERNAL_ERROR,
                         "invalid entity type found\n", NULL);
        }

        /*
         * Store the number of entities needing parsing for this entity
         * content and do checkings
         */
        diff = ctxt->nbentities - oldnbent + 1;
        if (diff > INT_MAX / 2)
            diff = INT_MAX / 2;
        ent->checked = diff * 2;
        if ((ent->content != NULL) && (xmlStrchr(ent->content, '<')))
            ent->checked |= 1;
        if (ret == XML_ERR_ENTITY_LOOP) {
            xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
            xmlHaltParser(ctxt);
            xmlFreeNodeList(list);
            return;
        }
        if (xmlParserEntityCheck(ctxt, 0, ent, 0)) {
            xmlFreeNodeList(list);
            return;
        }

        if ((ret == XML_ERR_OK) && (list != NULL)) {
            if (((ent->etype == XML_INTERNAL_GENERAL_ENTITY) ||
             (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY))&&
                (ent->children == NULL)) {
                ent->children = list;
                /*
                 * Prune it directly in the generated document
                 * except for single text nodes.
                 */
                if ((ctxt->replaceEntities == 0) ||
                    (ctxt->parseMode == XML_PARSE_READER) ||
                    ((list->type == XML_TEXT_NODE) &&
                     (list->next == NULL))) {
                    ent->owner = 1;
                    while (list != NULL) {
                        list->parent = (xmlNodePtr) ent;
                        if (list->doc != ent->doc)
                            xmlSetTreeDoc(list, ent->doc);
                        if (list->next == NULL)
                            ent->last = list;
                        list = list->next;
                    }
                    list = NULL;
                } else {
                    ent->owner = 0;
                    while (list != NULL) {
                        list->parent = (xmlNodePtr) ctxt->node;
                        list->doc = ctxt->myDoc;
                        if (list->next == NULL)
                            ent->last = list;
                        list = list->next;
                    }
                    list = ent->children;
#ifdef LIBXML_LEGACY_ENABLED
                    if (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY)
                        xmlAddEntityReference(ent, list, NULL);
#endif /* LIBXML_LEGACY_ENABLED */
                }
            } else {
                xmlFreeNodeList(list);
                list = NULL;
            }
        } else if ((ret != XML_ERR_OK) &&
                   (ret != XML_WAR_UNDECLARED_ENTITY)) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_UNDECLARED_ENTITY,
                     "Entity '%s' failed to parse\n", ent->name);
            if (ent->content != NULL)
                ent->content[0] = 0;
            xmlParserEntityCheck(ctxt, 0, ent, 0);
        } else if (list != NULL) {
            xmlFreeNodeList(list);
            list = NULL;
        }
        if (ent->checked == 0)
            ent->checked = 2;

        /* Prevent entity from being parsed and expanded twice (Bug 760367). */
        was_checked = 0;
    } else if (ent->checked != 1) {
        ctxt->nbentities += ent->checked / 2;
    }

    /*
     * Now that the entity content has been gathered
     * provide it to the application, this can take different forms based
     * on the parsing modes.
     */
    if (ent->children == NULL) {
        /*
         * Probably running in SAX mode and the callbacks don't
         * build the entity content. So unless we already went
         * though parsing for first checking go though the entity
         * content to generate callbacks associated to the entity
         */
        if (was_checked != 0) {
            void *user_data;
            /*
             * This is a bit hackish but this seems the best
             * way to make sure both SAX and DOM entity support
             * behaves okay.
             */
            if (ctxt->userData == ctxt)
                user_data = NULL;
            else
                user_data = ctxt->userData;

            if (ent->etype == XML_INTERNAL_GENERAL_ENTITY) {
                ctxt->depth++;
                ret = xmlParseBalancedChunkMemoryInternal(ctxt,
                                   ent->content, user_data, NULL);
                ctxt->depth--;
            } else if (ent->etype ==
                       XML_EXTERNAL_GENERAL_PARSED_ENTITY) {
                ctxt->depth++;
                ret = xmlParseExternalEntityPrivate(ctxt->myDoc, ctxt,
                           ctxt->sax, user_data, ctxt->depth,
                           ent->URI, ent->ExternalID, NULL);
                ctxt->depth--;
            } else {
                ret = XML_ERR_ENTITY_PE_INTERNAL;
                xmlErrMsgStr(ctxt, XML_ERR_INTERNAL_ERROR,
                             "invalid entity type found\n", NULL);
            }
            if (ret == XML_ERR_ENTITY_LOOP) {
                xmlFatalErr(ctxt, XML_ERR_ENTITY_LOOP, NULL);
                return;
            }
        }
        if ((ctxt->sax != NULL) && (ctxt->sax->reference != NULL) &&
            (ctxt->replaceEntities == 0) && (!ctxt->disableSAX)) {
            /*
             * Entity reference callback comes second, it's somewhat
             * superfluous but a compatibility to historical behaviour
             */
            ctxt->sax->reference(ctxt->userData, ent->name);
        }
        return;
    }

    /*
     * If we didn't get any children for the entity being built
     */
    if ((ctxt->sax != NULL) && (ctxt->sax->reference != NULL) &&
        (ctxt->replaceEntities == 0) && (!ctxt->disableSAX)) {
        /*
         * Create a node.
         */
        ctxt->sax->reference(ctxt->userData, ent->name);
        return;
    }

    if ((ctxt->replaceEntities) || (ent->children == NULL))  {
        /*
         * There is a problem on the handling of _private for entities
         * (bug 155816): Should we copy the content of the field from
         * the entity (possibly overwriting some value set by the user
         * when a copy is created), should we leave it alone, or should
         * we try to take care of different situations?  The problem
         * is exacerbated by the usage of this field by the xmlReader.
         * To fix this bug, we look at _private on the created node
         * and, if it's NULL, we copy in whatever was in the entity.
         * If it's not NULL we leave it alone.  This is somewhat of a
         * hack - maybe we should have further tests to determine
         * what to do.
         */
        if ((ctxt->node != NULL) && (ent->children != NULL)) {
            /*
             * Seems we are generating the DOM content, do
             * a simple tree copy for all references except the first
             * In the first occurrence list contains the replacement.
             */
            if (((list == NULL) && (ent->owner == 0)) ||
                (ctxt->parseMode == XML_PARSE_READER)) {
                xmlNodePtr nw = NULL, cur, firstChild = NULL;

                /*
                 * We are copying here, make sure there is no abuse
                 */
                ctxt->sizeentcopy += ent->length + 5;
                if (xmlParserEntityCheck(ctxt, 0, ent, ctxt->sizeentcopy))
                    return;

                /*
                 * when operating on a reader, the entities definitions
                 * are always owning the entities subtree.
                if (ctxt->parseMode == XML_PARSE_READER)
                    ent->owner = 1;
                 */

                cur = ent->children;
                while (cur != NULL) {
                    nw = xmlDocCopyNode(cur, ctxt->myDoc, 1);
                    if (nw != NULL) {
                        if (nw->_private == NULL)
                            nw->_private = cur->_private;
                        if (firstChild == NULL){
                            firstChild = nw;
                        }
                        nw = xmlAddChild(ctxt->node, nw);
                    }
                    if (cur == ent->last) {
                        /*
                         * needed to detect some strange empty
                         * node cases in the reader tests
                         */
                        if ((ctxt->parseMode == XML_PARSE_READER) &&
                            (nw != NULL) &&
                            (nw->type == XML_ELEMENT_NODE) &&
                            (nw->children == NULL))
                            nw->extra = 1;

                        break;
                    }
                    cur = cur->next;
                }
#ifdef LIBXML_LEGACY_ENABLED
                if (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY)
                  xmlAddEntityReference(ent, firstChild, nw);
#endif /* LIBXML_LEGACY_ENABLED */
            } else if ((list == NULL) || (ctxt->inputNr > 0)) {
                xmlNodePtr nw = NULL, cur, next, last,
                           firstChild = NULL;

                /*
                 * We are copying here, make sure there is no abuse
                 */
                ctxt->sizeentcopy += ent->length + 5;
                if (xmlParserEntityCheck(ctxt, 0, ent, ctxt->sizeentcopy))
                    return;

                /*
                 * Copy the entity child list and make it the new
                 * entity child list. The goal is to make sure any
                 * ID or REF referenced will be the one from the
                 * document content and not the entity copy.
                 */
                cur = ent->children;
                ent->children = NULL;
                last = ent->last;
                ent->last = NULL;
                while (cur != NULL) {
                    next = cur->next;
                    cur->next = NULL;
                    cur->parent = NULL;
                    nw = xmlDocCopyNode(cur, ctxt->myDoc, 1);
                    if (nw != NULL) {
                        if (nw->_private == NULL)
                            nw->_private = cur->_private;
                        if (firstChild == NULL){
                            firstChild = cur;
                        }
                        xmlAddChild((xmlNodePtr) ent, nw);
                        xmlAddChild(ctxt->node, cur);
                    }
                    if (cur == last)
                        break;
                    cur = next;
                }
                if (ent->owner == 0)
                    ent->owner = 1;
#ifdef LIBXML_LEGACY_ENABLED
                if (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY)
                  xmlAddEntityReference(ent, firstChild, nw);
#endif /* LIBXML_LEGACY_ENABLED */
            } else {
                const xmlChar *nbktext;

                /*
                 * the name change is to avoid coalescing of the
                 * node with a possible previous text one which
                 * would make ent->children a dangling pointer
                 */
                nbktext = xmlDictLookup(ctxt->dict, BAD_CAST "nbktext",
                                        -1);
                if (ent->children->type == XML_TEXT_NODE)
                    ent->children->name = nbktext;
                if ((ent->last != ent->children) &&
                    (ent->last->type == XML_TEXT_NODE))
                    ent->last->name = nbktext;
                xmlAddChildList(ctxt->node, ent->children);
            }

            /*
             * This is to avoid a nasty side effect, see
             * characters() in SAX.c
             */
            ctxt->nodemem = 0;
            ctxt->nodelen = 0;
            return;
        }
    }
}

/**
 * xmlParseEntityRef:
 * @ctxt:  an XML parser context
 *
 * parse ENTITY references declarations
 *
 * [68] EntityRef ::= '&' Name ';'
 *
 * [ WFC: Entity Declared ]
 * In a document without any DTD, a document with only an internal DTD
 * subset which contains no parameter entity references, or a document
 * with "standalone='yes'", the Name given in the entity reference
 * must match that in an entity declaration, except that well-formed
 * documents need not declare any of the following entities: amp, lt,
 * gt, apos, quot.  The declaration of a parameter entity must precede
 * any reference to it.  Similarly, the declaration of a general entity
 * must precede any reference to it which appears in a default value in an
 * attribute-list declaration. Note that if entities are declared in the
 * external subset or in external parameter entities, a non-validating
 * processor is not obligated to read and process their declarations;
 * for such documents, the rule that an entity must be declared is a
 * well-formedness constraint only if standalone='yes'.
 *
 * [ WFC: Parsed Entity ]
 * An entity reference must not contain the name of an unparsed entity
 *
 * Returns the xmlEntityPtr if found, or NULL otherwise.
 */
xmlEntityPtr
xmlParseEntityRef(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;
    xmlEntityPtr ent = NULL;

    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        return(NULL);

    if (RAW != '&')
        return(NULL);
    NEXT;
    name = xmlParseName(ctxt);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "xmlParseEntityRef: no name\n");
        return(NULL);
    }
    if (RAW != ';') {
        xmlFatalErr(ctxt, XML_ERR_ENTITYREF_SEMICOL_MISSING, NULL);
        return(NULL);
    }
    NEXT;

    /*
     * Predefined entities override any extra definition
     */
    if ((ctxt->options & XML_PARSE_OLDSAX) == 0) {
        ent = xmlGetPredefinedEntity(name);
        if (ent != NULL)
            return(ent);
    }

    /*
     * Increase the number of entity references parsed
     */
    ctxt->nbentities++;

    /*
     * Ask first SAX for entity resolution, otherwise try the
     * entities which may have stored in the parser context.
     */
    if (ctxt->sax != NULL) {
        if (ctxt->sax->getEntity != NULL)
            ent = ctxt->sax->getEntity(ctxt->userData, name);
        if ((ctxt->wellFormed == 1 ) && (ent == NULL) &&
            (ctxt->options & XML_PARSE_OLDSAX))
            ent = xmlGetPredefinedEntity(name);
        if ((ctxt->wellFormed == 1 ) && (ent == NULL) &&
            (ctxt->userData==ctxt)) {
            ent = xmlSAX2GetEntity(ctxt, name);
        }
    }
    if (ctxt->instate == XML_PARSER_EOF)
        return(NULL);
    /*
     * [ WFC: Entity Declared ]
     * In a document without any DTD, a document with only an
     * internal DTD subset which contains no parameter entity
     * references, or a document with "standalone='yes'", the
     * Name given in the entity reference must match that in an
     * entity declaration, except that well-formed documents
     * need not declare any of the following entities: amp, lt,
     * gt, apos, quot.
     * The declaration of a parameter entity must precede any
     * reference to it.
     * Similarly, the declaration of a general entity must
     * precede any reference to it which appears in a default
     * value in an attribute-list declaration. Note that if
     * entities are declared in the external subset or in
     * external parameter entities, a non-validating processor
     * is not obligated to read and process their declarations;
     * for such documents, the rule that an entity must be
     * declared is a well-formedness constraint only if
     * standalone='yes'.
     */
    if (ent == NULL) {
        if ((ctxt->standalone == 1) ||
            ((ctxt->hasExternalSubset == 0) &&
             (ctxt->hasPErefs == 0))) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_UNDECLARED_ENTITY,
                     "Entity '%s' not defined\n", name);
        } else {
            xmlErrMsgStr(ctxt, XML_WAR_UNDECLARED_ENTITY,
                     "Entity '%s' not defined\n", name);
            if ((ctxt->inSubset == 0) &&
                (ctxt->sax != NULL) &&
                (ctxt->sax->reference != NULL)) {
                ctxt->sax->reference(ctxt->userData, name);
            }
        }
        xmlParserEntityCheck(ctxt, 0, ent, 0);
        ctxt->valid = 0;
    }

    /*
     * [ WFC: Parsed Entity ]
     * An entity reference must not contain the name of an
     * unparsed entity
     */
    else if (ent->etype == XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) {
        xmlFatalErrMsgStr(ctxt, XML_ERR_UNPARSED_ENTITY,
                 "Entity reference to unparsed entity %s\n", name);
    }

    /*
     * [ WFC: No External Entity References ]
     * Attribute values cannot contain direct or indirect
     * entity references to external entities.
     */
    else if ((ctxt->instate == XML_PARSER_ATTRIBUTE_VALUE) &&
             (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY)) {
        xmlFatalErrMsgStr(ctxt, XML_ERR_ENTITY_IS_EXTERNAL,
             "Attribute references external entity '%s'\n", name);
    }
    /*
     * [ WFC: No < in Attribute Values ]
     * The replacement text of any entity referred to directly or
     * indirectly in an attribute value (other than "&lt;") must
     * not contain a <.
     */
    else if ((ctxt->instate == XML_PARSER_ATTRIBUTE_VALUE) &&
             (ent != NULL) && 
             (ent->etype != XML_INTERNAL_PREDEFINED_ENTITY)) {
        if (((ent->checked & 1) || (ent->checked == 0)) &&
             (ent->content != NULL) && (xmlStrchr(ent->content, '<'))) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_LT_IN_ATTRIBUTE,
        "'<' in entity '%s' is not allowed in attributes values\n", name);
        }
    }

    /*
     * Internal check, no parameter entities here ...
     */
    else {
        switch (ent->etype) {
            case XML_INTERNAL_PARAMETER_ENTITY:
            case XML_EXTERNAL_PARAMETER_ENTITY:
            xmlFatalErrMsgStr(ctxt, XML_ERR_ENTITY_IS_PARAMETER,
             "Attempt to reference the parameter entity '%s'\n",
                              name);
            break;
            default:
            break;
        }
    }

    /*
     * [ WFC: No Recursion ]
     * A parsed entity must not contain a recursive reference
     * to itself, either directly or indirectly.
     * Done somewhere else
     */
    return(ent);
}

/**
 * xmlParseStringEntityRef:
 * @ctxt:  an XML parser context
 * @str:  a pointer to an index in the string
 *
 * parse ENTITY references declarations, but this version parses it from
 * a string value.
 *
 * [68] EntityRef ::= '&' Name ';'
 *
 * [ WFC: Entity Declared ]
 * In a document without any DTD, a document with only an internal DTD
 * subset which contains no parameter entity references, or a document
 * with "standalone='yes'", the Name given in the entity reference
 * must match that in an entity declaration, except that well-formed
 * documents need not declare any of the following entities: amp, lt,
 * gt, apos, quot.  The declaration of a parameter entity must precede
 * any reference to it.  Similarly, the declaration of a general entity
 * must precede any reference to it which appears in a default value in an
 * attribute-list declaration. Note that if entities are declared in the
 * external subset or in external parameter entities, a non-validating
 * processor is not obligated to read and process their declarations;
 * for such documents, the rule that an entity must be declared is a
 * well-formedness constraint only if standalone='yes'.
 *
 * [ WFC: Parsed Entity ]
 * An entity reference must not contain the name of an unparsed entity
 *
 * Returns the xmlEntityPtr if found, or NULL otherwise. The str pointer
 * is updated to the current location in the string.
 */
static xmlEntityPtr
xmlParseStringEntityRef(xmlParserCtxtPtr ctxt, const xmlChar ** str) {
    xmlChar *name;
    const xmlChar *ptr;
    xmlChar cur;
    xmlEntityPtr ent = NULL;

    if ((str == NULL) || (*str == NULL))
        return(NULL);
    ptr = *str;
    cur = *ptr;
    if (cur != '&')
        return(NULL);

    ptr++;
    name = xmlParseStringName(ctxt, &ptr);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "xmlParseStringEntityRef: no name\n");
        *str = ptr;
        return(NULL);
    }
    if (*ptr != ';') {
        xmlFatalErr(ctxt, XML_ERR_ENTITYREF_SEMICOL_MISSING, NULL);
        xmlFree(name);
        *str = ptr;
        return(NULL);
    }
    ptr++;


    /*
     * Predefined entities override any extra definition
     */
    if ((ctxt->options & XML_PARSE_OLDSAX) == 0) {
        ent = xmlGetPredefinedEntity(name);
        if (ent != NULL) {
            xmlFree(name);
            *str = ptr;
            return(ent);
        }
    }

    /*
     * Increase the number of entity references parsed
     */
    ctxt->nbentities++;

    /*
     * Ask first SAX for entity resolution, otherwise try the
     * entities which may have stored in the parser context.
     */
    if (ctxt->sax != NULL) {
        if (ctxt->sax->getEntity != NULL)
            ent = ctxt->sax->getEntity(ctxt->userData, name);
        if ((ent == NULL) && (ctxt->options & XML_PARSE_OLDSAX))
            ent = xmlGetPredefinedEntity(name);
        if ((ent == NULL) && (ctxt->userData==ctxt)) {
            ent = xmlSAX2GetEntity(ctxt, name);
        }
    }
    if (ctxt->instate == XML_PARSER_EOF) {
        xmlFree(name);
        return(NULL);
    }

    /*
     * [ WFC: Entity Declared ]
     * In a document without any DTD, a document with only an
     * internal DTD subset which contains no parameter entity
     * references, or a document with "standalone='yes'", the
     * Name given in the entity reference must match that in an
     * entity declaration, except that well-formed documents
     * need not declare any of the following entities: amp, lt,
     * gt, apos, quot.
     * The declaration of a parameter entity must precede any
     * reference to it.
     * Similarly, the declaration of a general entity must
     * precede any reference to it which appears in a default
     * value in an attribute-list declaration. Note that if
     * entities are declared in the external subset or in
     * external parameter entities, a non-validating processor
     * is not obligated to read and process their declarations;
     * for such documents, the rule that an entity must be
     * declared is a well-formedness constraint only if
     * standalone='yes'.
     */
    if (ent == NULL) {
        if ((ctxt->standalone == 1) ||
            ((ctxt->hasExternalSubset == 0) &&
             (ctxt->hasPErefs == 0))) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_UNDECLARED_ENTITY,
                     "Entity '%s' not defined\n", name);
        } else {
            xmlErrMsgStr(ctxt, XML_WAR_UNDECLARED_ENTITY,
                          "Entity '%s' not defined\n",
                          name);
        }
        xmlParserEntityCheck(ctxt, 0, ent, 0);
        /* TODO ? check regressions ctxt->valid = 0; */
    }

    /*
     * [ WFC: Parsed Entity ]
     * An entity reference must not contain the name of an
     * unparsed entity
     */
    else if (ent->etype == XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) {
        xmlFatalErrMsgStr(ctxt, XML_ERR_UNPARSED_ENTITY,
                 "Entity reference to unparsed entity %s\n", name);
    }

    /*
     * [ WFC: No External Entity References ]
     * Attribute values cannot contain direct or indirect
     * entity references to external entities.
     */
    else if ((ctxt->instate == XML_PARSER_ATTRIBUTE_VALUE) &&
             (ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY)) {
        xmlFatalErrMsgStr(ctxt, XML_ERR_ENTITY_IS_EXTERNAL,
         "Attribute references external entity '%s'\n", name);
    }
    /*
     * [ WFC: No < in Attribute Values ]
     * The replacement text of any entity referred to directly or
     * indirectly in an attribute value (other than "&lt;") must
     * not contain a <.
     */
    else if ((ctxt->instate == XML_PARSER_ATTRIBUTE_VALUE) &&
             (ent != NULL) && (ent->content != NULL) &&
             (ent->etype != XML_INTERNAL_PREDEFINED_ENTITY) &&
             (xmlStrchr(ent->content, '<'))) {
        xmlFatalErrMsgStr(ctxt, XML_ERR_LT_IN_ATTRIBUTE,
     "'<' in entity '%s' is not allowed in attributes values\n",
                          name);
    }

    /*
     * Internal check, no parameter entities here ...
     */
    else {
        switch (ent->etype) {
            case XML_INTERNAL_PARAMETER_ENTITY:
            case XML_EXTERNAL_PARAMETER_ENTITY:
                xmlFatalErrMsgStr(ctxt, XML_ERR_ENTITY_IS_PARAMETER,
             "Attempt to reference the parameter entity '%s'\n",
                                  name);
            break;
            default:
            break;
        }
    }

    /*
     * [ WFC: No Recursion ]
     * A parsed entity must not contain a recursive reference
     * to itself, either directly or indirectly.
     * Done somewhere else
     */

    xmlFree(name);
    *str = ptr;
    return(ent);
}

/**
 * xmlParsePEReference:
 * @ctxt:  an XML parser context
 *
 * parse PEReference declarations
 * The entity content is handled directly by pushing it's content as
 * a new input stream.
 *
 * [69] PEReference ::= '%' Name ';'
 *
 * [ WFC: No Recursion ]
 * A parsed entity must not contain a recursive
 * reference to itself, either directly or indirectly.
 *
 * [ WFC: Entity Declared ]
 * In a document without any DTD, a document with only an internal DTD
 * subset which contains no parameter entity references, or a document
 * with "standalone='yes'", ...  ... The declaration of a parameter
 * entity must precede any reference to it...
 *
 * [ VC: Entity Declared ]
 * In a document with an external subset or external parameter entities
 * with "standalone='no'", ...  ... The declaration of a parameter entity
 * must precede any reference to it...
 *
 * [ WFC: In DTD ]
 * Parameter-entity references may only appear in the DTD.
 * NOTE: misleading but this is handled.
 */
void
xmlParsePEReference(xmlParserCtxtPtr ctxt)
{
    const xmlChar *name;
    xmlEntityPtr entity = NULL;
    xmlParserInputPtr input;

    if (RAW != '%')
        return;
    NEXT;
    name = xmlParseName(ctxt);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_PEREF_NO_NAME, "PEReference: no name\n");
        return;
    }
    if (xmlParserDebugEntities)
        xmlGenericError(xmlGenericErrorContext,
                "PEReference: %s\n", name);
    if (RAW != ';') {
        xmlFatalErr(ctxt, XML_ERR_PEREF_SEMICOL_MISSING, NULL);
        return;
    }

    NEXT;

    /*
     * Increase the number of entity references parsed
     */
    ctxt->nbentities++;

    /*
     * Request the entity from SAX
     */
    if ((ctxt->sax != NULL) &&
        (ctxt->sax->getParameterEntity != NULL))
        entity = ctxt->sax->getParameterEntity(ctxt->userData, name);
    if (ctxt->instate == XML_PARSER_EOF)
        return;
    if (entity == NULL) {
        /*
         * [ WFC: Entity Declared ]
         * In a document without any DTD, a document with only an
         * internal DTD subset which contains no parameter entity
         * references, or a document with "standalone='yes'", ...
         * ... The declaration of a parameter entity must precede
         * any reference to it...
         */
        if ((ctxt->standalone == 1) ||
            ((ctxt->hasExternalSubset == 0) &&
             (ctxt->hasPErefs == 0))) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_UNDECLARED_ENTITY,
                              "PEReference: %%%s; not found\n",
                              name);
        } else {
            /*
             * [ VC: Entity Declared ]
             * In a document with an external subset or external
             * parameter entities with "standalone='no'", ...
             * ... The declaration of a parameter entity must
             * precede any reference to it...
             */
            if ((ctxt->validate) && (ctxt->vctxt.error != NULL)) {
                xmlValidityError(ctxt, XML_WAR_UNDECLARED_ENTITY,
                                 "PEReference: %%%s; not found\n",
                                 name, NULL);
            } else
                xmlWarningMsg(ctxt, XML_WAR_UNDECLARED_ENTITY,
                              "PEReference: %%%s; not found\n",
                              name, NULL);
            ctxt->valid = 0;
        }
        xmlParserEntityCheck(ctxt, 0, NULL, 0);
    } else {
        /*
         * Internal checking in case the entity quest barfed
         */
        if ((entity->etype != XML_INTERNAL_PARAMETER_ENTITY) &&
            (entity->etype != XML_EXTERNAL_PARAMETER_ENTITY)) {
            xmlWarningMsg(ctxt, XML_WAR_UNDECLARED_ENTITY,
                  "Internal: %%%s; is not a parameter entity\n",
                          name, NULL);
        } else {
            xmlChar start[4];
            xmlCharEncoding enc;

            if (xmlParserEntityCheck(ctxt, 0, entity, 0))
                return;

            if ((entity->etype == XML_EXTERNAL_PARAMETER_ENTITY) &&
                ((ctxt->options & XML_PARSE_NOENT) == 0) &&
                ((ctxt->options & XML_PARSE_DTDVALID) == 0) &&
                ((ctxt->options & XML_PARSE_DTDLOAD) == 0) &&
                ((ctxt->options & XML_PARSE_DTDATTR) == 0) &&
                (ctxt->replaceEntities == 0) &&
                (ctxt->validate == 0))
                return;

            input = xmlNewEntityInputStream(ctxt, entity);
            if (xmlPushInput(ctxt, input) < 0) {
                xmlFreeInputStream(input);
                return;
            }

            if (entity->etype == XML_EXTERNAL_PARAMETER_ENTITY) {
                /*
                 * Get the 4 first bytes and decode the charset
                 * if enc != XML_CHAR_ENCODING_NONE
                 * plug some encoding conversion routines.
                 * Note that, since we may have some non-UTF8
                 * encoding (like UTF16, bug 135229), the 'length'
                 * is not known, but we can calculate based upon
                 * the amount of data in the buffer.
                 */
                GROW
                if (ctxt->instate == XML_PARSER_EOF)
                    return;
                if ((ctxt->input->end - ctxt->input->cur)>=4) {
                    start[0] = RAW;
                    start[1] = NXT(1);
                    start[2] = NXT(2);
                    start[3] = NXT(3);
                    enc = xmlDetectCharEncoding(start, 4);
                    if (enc != XML_CHAR_ENCODING_NONE) {
                        xmlSwitchEncoding(ctxt, enc);
                    }
                }

                if ((CMP5(CUR_PTR, '<', '?', 'x', 'm', 'l')) &&
                    (IS_BLANK_CH(NXT(5)))) {
                    xmlParseTextDecl(ctxt);
                }
            }
        }
    }
    ctxt->hasPErefs = 1;
}

/**
 * xmlLoadEntityContent:
 * @ctxt:  an XML parser context
 * @entity: an unloaded system entity
 *
 * Load the original content of the given system entity from the
 * ExternalID/SystemID given. This is to be used for Included in Literal
 * http://www.w3.org/TR/REC-xml/#inliteral processing of entities references
 *
 * Returns 0 in case of success and -1 in case of failure
 */
static int
xmlLoadEntityContent(xmlParserCtxtPtr ctxt, xmlEntityPtr entity) {
    xmlParserInputPtr input;
    xmlBufferPtr buf;
    int l, c;
    int count = 0;

    if ((ctxt == NULL) || (entity == NULL) ||
        ((entity->etype != XML_EXTERNAL_PARAMETER_ENTITY) &&
         (entity->etype != XML_EXTERNAL_GENERAL_PARSED_ENTITY)) ||
        (entity->content != NULL)) {
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                    "xmlLoadEntityContent parameter error");
        return(-1);
    }

    if (xmlParserDebugEntities)
        xmlGenericError(xmlGenericErrorContext,
                "Reading %s entity content input\n", entity->name);

    buf = xmlBufferCreate();
    if (buf == NULL) {
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                    "xmlLoadEntityContent parameter error");
        return(-1);
    }
    xmlBufferSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);

    input = xmlNewEntityInputStream(ctxt, entity);
    if (input == NULL) {
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                    "xmlLoadEntityContent input error");
        xmlBufferFree(buf);
        return(-1);
    }

    /*
     * Push the entity as the current input, read char by char
     * saving to the buffer until the end of the entity or an error
     */
    if (xmlPushInput(ctxt, input) < 0) {
        xmlBufferFree(buf);
        xmlFreeInputStream(input);
        return(-1);
    }

    GROW;
    c = CUR_CHAR(l);
    while ((ctxt->input == input) && (ctxt->input->cur < ctxt->input->end) &&
           (IS_CHAR(c))) {
        xmlBufferAdd(buf, ctxt->input->cur, l);
        if (count++ > XML_PARSER_CHUNK_SIZE) {
            count = 0;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF) {
                xmlBufferFree(buf);
                return(-1);
            }
        }
        NEXTL(l);
        c = CUR_CHAR(l);
        if (c == 0) {
            count = 0;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF) {
                xmlBufferFree(buf);
                return(-1);
            }
            c = CUR_CHAR(l);
        }
    }

    if ((ctxt->input == input) && (ctxt->input->cur >= ctxt->input->end)) {
        xmlPopInput(ctxt);
    } else if (!IS_CHAR(c)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INVALID_CHAR,
                          "xmlLoadEntityContent: invalid char value %d\n",
                          c);
        xmlBufferFree(buf);
        return(-1);
    }
    entity->content = buf->content;
    buf->content = NULL;
    xmlBufferFree(buf);

    return(0);
}

/**
 * xmlParseStringPEReference:
 * @ctxt:  an XML parser context
 * @str:  a pointer to an index in the string
 *
 * parse PEReference declarations
 *
 * [69] PEReference ::= '%' Name ';'
 *
 * [ WFC: No Recursion ]
 * A parsed entity must not contain a recursive
 * reference to itself, either directly or indirectly.
 *
 * [ WFC: Entity Declared ]
 * In a document without any DTD, a document with only an internal DTD
 * subset which contains no parameter entity references, or a document
 * with "standalone='yes'", ...  ... The declaration of a parameter
 * entity must precede any reference to it...
 *
 * [ VC: Entity Declared ]
 * In a document with an external subset or external parameter entities
 * with "standalone='no'", ...  ... The declaration of a parameter entity
 * must precede any reference to it...
 *
 * [ WFC: In DTD ]
 * Parameter-entity references may only appear in the DTD.
 * NOTE: misleading but this is handled.
 *
 * Returns the string of the entity content.
 *         str is updated to the current value of the index
 */
static xmlEntityPtr
xmlParseStringPEReference(xmlParserCtxtPtr ctxt, const xmlChar **str) {
    const xmlChar *ptr;
    xmlChar cur;
    xmlChar *name;
    xmlEntityPtr entity = NULL;

    if ((str == NULL) || (*str == NULL)) return(NULL);
    ptr = *str;
    cur = *ptr;
    if (cur != '%')
        return(NULL);
    ptr++;
    name = xmlParseStringName(ctxt, &ptr);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "xmlParseStringPEReference: no name\n");
        *str = ptr;
        return(NULL);
    }
    cur = *ptr;
    if (cur != ';') {
        xmlFatalErr(ctxt, XML_ERR_ENTITYREF_SEMICOL_MISSING, NULL);
        xmlFree(name);
        *str = ptr;
        return(NULL);
    }
    ptr++;

    /*
     * Increase the number of entity references parsed
     */
    ctxt->nbentities++;

    /*
     * Request the entity from SAX
     */
    if ((ctxt->sax != NULL) &&
        (ctxt->sax->getParameterEntity != NULL))
        entity = ctxt->sax->getParameterEntity(ctxt->userData, name);
    if (ctxt->instate == XML_PARSER_EOF) {
        xmlFree(name);
        *str = ptr;
        return(NULL);
    }
    if (entity == NULL) {
        /*
         * [ WFC: Entity Declared ]
         * In a document without any DTD, a document with only an
         * internal DTD subset which contains no parameter entity
         * references, or a document with "standalone='yes'", ...
         * ... The declaration of a parameter entity must precede
         * any reference to it...
         */
        if ((ctxt->standalone == 1) ||
            ((ctxt->hasExternalSubset == 0) && (ctxt->hasPErefs == 0))) {
            xmlFatalErrMsgStr(ctxt, XML_ERR_UNDECLARED_ENTITY,
                 "PEReference: %%%s; not found\n", name);
        } else {
            /*
             * [ VC: Entity Declared ]
             * In a document with an external subset or external
             * parameter entities with "standalone='no'", ...
             * ... The declaration of a parameter entity must
             * precede any reference to it...
             */
            xmlWarningMsg(ctxt, XML_WAR_UNDECLARED_ENTITY,
                          "PEReference: %%%s; not found\n",
                          name, NULL);
            ctxt->valid = 0;
        }
        xmlParserEntityCheck(ctxt, 0, NULL, 0);
    } else {
        /*
         * Internal checking in case the entity quest barfed
         */
        if ((entity->etype != XML_INTERNAL_PARAMETER_ENTITY) &&
            (entity->etype != XML_EXTERNAL_PARAMETER_ENTITY)) {
            xmlWarningMsg(ctxt, XML_WAR_UNDECLARED_ENTITY,
                          "%%%s; is not a parameter entity\n",
                          name, NULL);
        }
    }
    ctxt->hasPErefs = 1;
    xmlFree(name);
    *str = ptr;
    return(entity);
}

/**
 * xmlParseDocTypeDecl:
 * @ctxt:  an XML parser context
 *
 * parse a DOCTYPE declaration
 *
 * [28] doctypedecl ::= '<!DOCTYPE' S Name (S ExternalID)? S?
 *                      ('[' (markupdecl | PEReference | S)* ']' S?)? '>'
 *
 * [ VC: Root Element Type ]
 * The Name in the document type declaration must match the element
 * type of the root element.
 */

void
xmlParseDocTypeDecl(xmlParserCtxtPtr ctxt) {
    const xmlChar *name = NULL;
    xmlChar *ExternalID = NULL;
    xmlChar *URI = NULL;

    /*
     * We know that '<!DOCTYPE' has been detected.
     */
    SKIP(9);

    SKIP_BLANKS;

    /*
     * Parse the DOCTYPE name.
     */
    name = xmlParseName(ctxt);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "xmlParseDocTypeDecl : no DOCTYPE name !\n");
    }
    ctxt->intSubName = name;

    SKIP_BLANKS;

    /*
     * Check for SystemID and ExternalID
     */
    URI = xmlParseExternalID(ctxt, &ExternalID, 1);

    if ((URI != NULL) || (ExternalID != NULL)) {
        ctxt->hasExternalSubset = 1;
    }
    ctxt->extSubURI = URI;
    ctxt->extSubSystem = ExternalID;

    SKIP_BLANKS;

    /*
     * Create and update the internal subset.
     */
    if ((ctxt->sax != NULL) && (ctxt->sax->internalSubset != NULL) &&
        (!ctxt->disableSAX))
        ctxt->sax->internalSubset(ctxt->userData, name, ExternalID, URI);
    if (ctxt->instate == XML_PARSER_EOF)
        return;

    /*
     * Is there any internal subset declarations ?
     * they are handled separately in xmlParseInternalSubset()
     */
    if (RAW == '[')
        return;

    /*
     * We should be at the end of the DOCTYPE declaration.
     */
    if (RAW != '>') {
        xmlFatalErr(ctxt, XML_ERR_DOCTYPE_NOT_FINISHED, NULL);
    }
    NEXT;
}

/**
 * xmlParseInternalSubset:
 * @ctxt:  an XML parser context
 *
 * parse the internal subset declaration
 *
 * [28 end] ('[' (markupdecl | PEReference | S)* ']' S?)? '>'
 */

static void
xmlParseInternalSubset(xmlParserCtxtPtr ctxt) {
    /*
     * Is there any DTD definition ?
     */
    if (RAW == '[') {
        int baseInputNr = ctxt->inputNr;
        ctxt->instate = XML_PARSER_DTD;
        NEXT;
        /*
         * Parse the succession of Markup declarations and
         * PEReferences.
         * Subsequence (markupdecl | PEReference | S)*
         */
        while (((RAW != ']') || (ctxt->inputNr > baseInputNr)) &&
               (ctxt->instate != XML_PARSER_EOF)) {
            int id = ctxt->input->id;
            unsigned long cons = CUR_CONSUMED;

            SKIP_BLANKS;
            xmlParseMarkupDecl(ctxt);
            xmlParsePEReference(ctxt);

            /*
             * Conditional sections are allowed from external entities included
             * by PE References in the internal subset.
             */
            if ((ctxt->inputNr > 1) && (ctxt->input->filename != NULL) &&
                (RAW == '<') && (NXT(1) == '!') && (NXT(2) == '[')) {
                xmlParseConditionalSections(ctxt);
            }

            if ((id == ctxt->input->id) && (cons == CUR_CONSUMED)) {
                xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
             "xmlParseInternalSubset: error detected in Markup declaration\n");
                if (ctxt->inputNr > baseInputNr)
                    xmlPopInput(ctxt);
                else
                    break;
            }
        }
        if (RAW == ']') {
            NEXT;
            SKIP_BLANKS;
        }
    }

    /*
     * We should be at the end of the DOCTYPE declaration.
     */
    if (RAW != '>') {
        xmlFatalErr(ctxt, XML_ERR_DOCTYPE_NOT_FINISHED, NULL);
        return;
    }
    NEXT;
}

#ifdef LIBXML_SAX1_ENABLED
/**
 * xmlParseAttribute:
 * @ctxt:  an XML parser context
 * @value:  a xmlChar ** used to store the value of the attribute
 *
 * parse an attribute
 *
 * [41] Attribute ::= Name Eq AttValue
 *
 * [ WFC: No External Entity References ]
 * Attribute values cannot contain direct or indirect entity references
 * to external entities.
 *
 * [ WFC: No < in Attribute Values ]
 * The replacement text of any entity referred to directly or indirectly in
 * an attribute value (other than "&lt;") must not contain a <.
 *
 * [ VC: Attribute Value Type ]
 * The attribute must have been declared; the value must be of the type
 * declared for it.
 *
 * [25] Eq ::= S? '=' S?
 *
 * With namespace:
 *
 * [NS 11] Attribute ::= QName Eq AttValue
 *
 * Also the case QName == xmlns:??? is handled independently as a namespace
 * definition.
 *
 * Returns the attribute name, and the value in *value.
 */

const xmlChar *
xmlParseAttribute(xmlParserCtxtPtr ctxt, xmlChar **value) {
    const xmlChar *name;
    xmlChar *val;

    *value = NULL;
    GROW;
    name = xmlParseName(ctxt);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "error parsing attribute name\n");
        return(NULL);
    }

    /*
     * read the value
     */
    SKIP_BLANKS;
    if (RAW == '=') {
        NEXT;
        SKIP_BLANKS;
        val = xmlParseAttValue(ctxt);
        ctxt->instate = XML_PARSER_CONTENT;
    } else {
        xmlFatalErrMsgStr(ctxt, XML_ERR_ATTRIBUTE_WITHOUT_VALUE,
               "Specification mandates value for attribute %s\n", name);
        return(NULL);
    }

    /*
     * Check that xml:lang conforms to the specification
     * No more registered as an error, just generate a warning now
     * since this was deprecated in XML second edition
     */
    if ((ctxt->pedantic) && (xmlStrEqual(name, BAD_CAST "xml:lang"))) {
        if (!xmlCheckLanguageID(val)) {
            xmlWarningMsg(ctxt, XML_WAR_LANG_VALUE,
                          "Malformed value for xml:lang : %s\n",
                          val, NULL);
        }
    }

    /*
     * Check that xml:space conforms to the specification
     */
    if (xmlStrEqual(name, BAD_CAST "xml:space")) {
        if (xmlStrEqual(val, BAD_CAST "default"))
            *(ctxt->space) = 0;
        else if (xmlStrEqual(val, BAD_CAST "preserve"))
            *(ctxt->space) = 1;
        else {
                xmlWarningMsg(ctxt, XML_WAR_SPACE_VALUE,
"Invalid value \"%s\" for xml:space : \"default\" or \"preserve\" expected\n",
                                 val, NULL);
        }
    }

    *value = val;
    return(name);
}

/**
 * xmlParseStartTag:
 * @ctxt:  an XML parser context
 *
 * parse a start of tag either for rule element or
 * EmptyElement. In both case we don't parse the tag closing chars.
 *
 * [40] STag ::= '<' Name (S Attribute)* S? '>'
 *
 * [ WFC: Unique Att Spec ]
 * No attribute name may appear more than once in the same start-tag or
 * empty-element tag.
 *
 * [44] EmptyElemTag ::= '<' Name (S Attribute)* S? '/>'
 *
 * [ WFC: Unique Att Spec ]
 * No attribute name may appear more than once in the same start-tag or
 * empty-element tag.
 *
 * With namespace:
 *
 * [NS 8] STag ::= '<' QName (S Attribute)* S? '>'
 *
 * [NS 10] EmptyElement ::= '<' QName (S Attribute)* S? '/>'
 *
 * Returns the element name parsed
 */

const xmlChar *
xmlParseStartTag(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;
    const xmlChar *attname;
    xmlChar *attvalue;
    const xmlChar **atts = ctxt->atts;
    int nbatts = 0;
    int maxatts = ctxt->maxatts;
    int i;

    if (RAW != '<') return(NULL);
    NEXT1;

    name = xmlParseName(ctxt);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
             "xmlParseStartTag: invalid element name\n");
        return(NULL);
    }

    /*
     * Now parse the attributes, it ends up with the ending
     *
     * (S Attribute)* S?
     */
    SKIP_BLANKS;
    GROW;

    while (((RAW != '>') &&
           ((RAW != '/') || (NXT(1) != '>')) &&
           (IS_BYTE_CHAR(RAW))) && (ctxt->instate != XML_PARSER_EOF)) {
        int id = ctxt->input->id;
        unsigned long cons = CUR_CONSUMED;

        attname = xmlParseAttribute(ctxt, &attvalue);
        if ((attname != NULL) && (attvalue != NULL)) {
            /*
             * [ WFC: Unique Att Spec ]
             * No attribute name may appear more than once in the same
             * start-tag or empty-element tag.
             */
            for (i = 0; i < nbatts;i += 2) {
                if (xmlStrEqual(atts[i], attname)) {
                    xmlErrAttributeDup(ctxt, NULL, attname);
                    xmlFree(attvalue);
                    goto failed;
                }
            }
            /*
             * Add the pair to atts
             */
            if (atts == NULL) {
                maxatts = 22; /* allow for 10 attrs by default */
                atts = (const xmlChar **)
                       xmlMalloc(maxatts * sizeof(xmlChar *));
                if (atts == NULL) {
                    xmlErrMemory(ctxt, NULL);
                    if (attvalue != NULL)
                        xmlFree(attvalue);
                    goto failed;
                }
                ctxt->atts = atts;
                ctxt->maxatts = maxatts;
            } else if (nbatts + 4 > maxatts) {
                const xmlChar **n;

                maxatts *= 2;
                n = (const xmlChar **) xmlRealloc((void *) atts,
                                             maxatts * sizeof(const xmlChar *));
                if (n == NULL) {
                    xmlErrMemory(ctxt, NULL);
                    if (attvalue != NULL)
                        xmlFree(attvalue);
                    goto failed;
                }
                atts = n;
                ctxt->atts = atts;
                ctxt->maxatts = maxatts;
            }
            atts[nbatts++] = attname;
            atts[nbatts++] = attvalue;
            atts[nbatts] = NULL;
            atts[nbatts + 1] = NULL;
        } else {
            if (attvalue != NULL)
                xmlFree(attvalue);
        }

failed:

        GROW
        if ((RAW == '>') || (((RAW == '/') && (NXT(1) == '>'))))
            break;
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "attributes construct error\n");
        }
        if ((cons == CUR_CONSUMED) && (id == ctxt->input->id) &&
            (attname == NULL) && (attvalue == NULL)) {
            xmlFatalErrMsg(ctxt, XML_ERR_INTERNAL_ERROR,
                           "xmlParseStartTag: problem parsing attributes\n");
            break;
        }
        SHRINK;
        GROW;
    }

    /*
     * SAX: Start of Element !
     */
    if ((ctxt->sax != NULL) && (ctxt->sax->startElement != NULL) &&
        (!ctxt->disableSAX)) {
        if (nbatts > 0)
            ctxt->sax->startElement(ctxt->userData, name, atts);
        else
            ctxt->sax->startElement(ctxt->userData, name, NULL);
    }

    if (atts != NULL) {
        /* Free only the content strings */
        for (i = 1;i < nbatts;i+=2)
            if (atts[i] != NULL)
               xmlFree((xmlChar *) atts[i]);
    }
    return(name);
}

/**
 * xmlParseEndTag1:
 * @ctxt:  an XML parser context
 * @line:  line of the start tag
 * @nsNr:  number of namespaces on the start tag
 *
 * parse an end of tag
 *
 * [42] ETag ::= '</' Name S? '>'
 *
 * With namespace
 *
 * [NS 9] ETag ::= '</' QName S? '>'
 */

static void
xmlParseEndTag1(xmlParserCtxtPtr ctxt, int line) {
    const xmlChar *name;

    GROW;
    if ((RAW != '<') || (NXT(1) != '/')) {
        xmlFatalErrMsg(ctxt, XML_ERR_LTSLASH_REQUIRED,
                       "xmlParseEndTag: '</' not found\n");
        return;
    }
    SKIP(2);

    name = xmlParseNameAndCompare(ctxt,ctxt->name);

    /*
     * We should definitely be at the ending "S? '>'" part
     */
    GROW;
    SKIP_BLANKS;
    if ((!IS_BYTE_CHAR(RAW)) || (RAW != '>')) {
        xmlFatalErr(ctxt, XML_ERR_GT_REQUIRED, NULL);
    } else
        NEXT1;

    /*
     * [ WFC: Element Type Match ]
     * The Name in an element's end-tag must match the element type in the
     * start-tag.
     *
     */
    if (name != (xmlChar*)1) {
        if (name == NULL) name = BAD_CAST "unparsable";
        xmlFatalErrMsgStrIntStr(ctxt, XML_ERR_TAG_NAME_MISMATCH,
                     "Opening and ending tag mismatch: %s line %d and %s\n",
                                ctxt->name, line, name);
    }

    /*
     * SAX: End of Tag
     */
    if ((ctxt->sax != NULL) && (ctxt->sax->endElement != NULL) &&
        (!ctxt->disableSAX))
        ctxt->sax->endElement(ctxt->userData, ctxt->name);

    namePop(ctxt);
    spacePop(ctxt);
    return;
}

/**
 * xmlParseEndTag:
 * @ctxt:  an XML parser context
 *
 * parse an end of tag
 *
 * [42] ETag ::= '</' Name S? '>'
 *
 * With namespace
 *
 * [NS 9] ETag ::= '</' QName S? '>'
 */

void
xmlParseEndTag(xmlParserCtxtPtr ctxt) {
    xmlParseEndTag1(ctxt, 0);
}
#endif /* LIBXML_SAX1_ENABLED */

/************************************************************************
 *                                                                      *
 *                    SAX 2 specific operations                         *
 *                                                                      *
 ************************************************************************/

/*
 * xmlGetNamespace:
 * @ctxt:  an XML parser context
 * @prefix:  the prefix to lookup
 *
 * Lookup the namespace name for the @prefix (which ca be NULL)
 * The prefix must come from the @ctxt->dict dictionary
 *
 * Returns the namespace name or NULL if not bound
 */
static const xmlChar *
xmlGetNamespace(xmlParserCtxtPtr ctxt, const xmlChar *prefix) {
    int i;

    if (prefix == ctxt->str_xml) return(ctxt->str_xml_ns);
    for (i = ctxt->nsNr - 2;i >= 0;i-=2)
        if (ctxt->nsTab[i] == prefix) {
            if ((prefix == NULL) && (*ctxt->nsTab[i + 1] == 0))
                return(NULL);
            return(ctxt->nsTab[i + 1]);
        }
    return(NULL);
}

/**
 * xmlParseQName:
 * @ctxt:  an XML parser context
 * @prefix:  pointer to store the prefix part
 *
 * parse an XML Namespace QName
 *
 * [6]  QName  ::= (Prefix ':')? LocalPart
 * [7]  Prefix  ::= NCName
 * [8]  LocalPart  ::= NCName
 *
 * Returns the Name parsed or NULL
 */

static const xmlChar *
xmlParseQName(xmlParserCtxtPtr ctxt, const xmlChar **prefix) {
    const xmlChar *l, *p;

    GROW;

    l = xmlParseNCName(ctxt);
    if (l == NULL) {
        if (CUR == ':') {
            l = xmlParseName(ctxt);
            if (l != NULL) {
                xmlNsErr(ctxt, XML_NS_ERR_QNAME,
                         "Failed to parse QName '%s'\n", l, NULL, NULL);
                *prefix = NULL;
                return(l);
            }
        }
        return(NULL);
    }
    if (CUR == ':') {
        NEXT;
        p = l;
        l = xmlParseNCName(ctxt);
        if (l == NULL) {
            xmlChar *tmp;

            if (ctxt->instate == XML_PARSER_EOF)
                return(NULL);
            xmlNsErr(ctxt, XML_NS_ERR_QNAME,
                     "Failed to parse QName '%s:'\n", p, NULL, NULL);
            l = xmlParseNmtoken(ctxt);
            if (l == NULL) {
                if (ctxt->instate == XML_PARSER_EOF)
                    return(NULL);
                tmp = xmlBuildQName(BAD_CAST "", p, NULL, 0);
            } else {
                tmp = xmlBuildQName(l, p, NULL, 0);
                xmlFree((char *)l);
            }
            p = xmlDictLookup(ctxt->dict, tmp, -1);
            if (tmp != NULL) xmlFree(tmp);
            *prefix = NULL;
            return(p);
        }
        if (CUR == ':') {
            xmlChar *tmp;

            xmlNsErr(ctxt, XML_NS_ERR_QNAME,
                     "Failed to parse QName '%s:%s:'\n", p, l, NULL);
            NEXT;
            tmp = (xmlChar *) xmlParseName(ctxt);
            if (tmp != NULL) {
                tmp = xmlBuildQName(tmp, l, NULL, 0);
                l = xmlDictLookup(ctxt->dict, tmp, -1);
                if (tmp != NULL) xmlFree(tmp);
                *prefix = p;
                return(l);
            }
            if (ctxt->instate == XML_PARSER_EOF)
                return(NULL);
            tmp = xmlBuildQName(BAD_CAST "", l, NULL, 0);
            l = xmlDictLookup(ctxt->dict, tmp, -1);
            if (tmp != NULL) xmlFree(tmp);
            *prefix = p;
            return(l);
        }
        *prefix = p;
    } else
        *prefix = NULL;
    return(l);
}

/**
 * xmlParseQNameAndCompare:
 * @ctxt:  an XML parser context
 * @name:  the localname
 * @prefix:  the prefix, if any.
 *
 * parse an XML name and compares for match
 * (specialized for endtag parsing)
 *
 * Returns NULL for an illegal name, (xmlChar*) 1 for success
 * and the name for mismatch
 */

static const xmlChar *
xmlParseQNameAndCompare(xmlParserCtxtPtr ctxt, xmlChar const *name,
                        xmlChar const *prefix) {
    const xmlChar *cmp;
    const xmlChar *in;
    const xmlChar *ret;
    const xmlChar *prefix2;

    if (prefix == NULL) return(xmlParseNameAndCompare(ctxt, name));

    GROW;
    in = ctxt->input->cur;

    cmp = prefix;
    while (*in != 0 && *in == *cmp) {
        ++in;
        ++cmp;
    }
    if ((*cmp == 0) && (*in == ':')) {
        in++;
        cmp = name;
        while (*in != 0 && *in == *cmp) {
            ++in;
            ++cmp;
        }
        if (*cmp == 0 && (*in == '>' || IS_BLANK_CH (*in))) {
            /* success */
            ctxt->input->col += in - ctxt->input->cur;
            ctxt->input->cur = in;
            return((const xmlChar*) 1);
        }
    }
    /*
     * all strings coms from the dictionary, equality can be done directly
     */
    ret = xmlParseQName (ctxt, &prefix2);
    if ((ret == name) && (prefix == prefix2))
        return((const xmlChar*) 1);
    return ret;
}

/**
 * xmlParseAttValueInternal:
 * @ctxt:  an XML parser context
 * @len:  attribute len result
 * @alloc:  whether the attribute was reallocated as a new string
 * @normalize:  if 1 then further non-CDATA normalization must be done
 *
 * parse a value for an attribute.
 * NOTE: if no normalization is needed, the routine will return pointers
 *       directly from the data buffer.
 *
 * 3.3.3 Attribute-Value Normalization:
 * Before the value of an attribute is passed to the application or
 * checked for validity, the XML processor must normalize it as follows:
 * - a character reference is processed by appending the referenced
 *   character to the attribute value
 * - an entity reference is processed by recursively processing the
 *   replacement text of the entity
 * - a whitespace character (#x20, #xD, #xA, #x9) is processed by
 *   appending #x20 to the normalized value, except that only a single
 *   #x20 is appended for a "#xD#xA" sequence that is part of an external
 *   parsed entity or the literal entity value of an internal parsed entity
 * - other characters are processed by appending them to the normalized value
 * If the declared value is not CDATA, then the XML processor must further
 * process the normalized attribute value by discarding any leading and
 * trailing space (#x20) characters, and by replacing sequences of space
 * (#x20) characters by a single space (#x20) character.
 * All attributes for which no declaration has been read should be treated
 * by a non-validating parser as if declared CDATA.
 *
 * Returns the AttValue parsed or NULL. The value has to be freed by the
 *     caller if it was copied, this can be detected by val[*len] == 0.
 */

#define GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end) \
    const xmlChar *oldbase = ctxt->input->base;\
    GROW;\
    if (ctxt->instate == XML_PARSER_EOF)\
        return(NULL);\
    if (oldbase != ctxt->input->base) {\
        ptrdiff_t delta = ctxt->input->base - oldbase;\
        start = start + delta;\
        in = in + delta;\
    }\
    end = ctxt->input->end;

static xmlChar *
xmlParseAttValueInternal(xmlParserCtxtPtr ctxt, int *len, int *alloc,
                         int normalize)
{
    xmlChar limit = 0;
    const xmlChar *in = NULL, *start, *end, *last;
    xmlChar *ret = NULL;
    int line, col;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_HUGE_LENGTH :
                    XML_MAX_TEXT_LENGTH;

    GROW;
    in = (xmlChar *) CUR_PTR;
    line = ctxt->input->line;
    col = ctxt->input->col;
    if (*in != '"' && *in != '\'') {
        xmlFatalErr(ctxt, XML_ERR_ATTRIBUTE_NOT_STARTED, NULL);
        return (NULL);
    }
    ctxt->instate = XML_PARSER_ATTRIBUTE_VALUE;

    /*
     * try to handle in this routine the most common case where no
     * allocation of a new string is required and where content is
     * pure ASCII.
     */
    limit = *in++;
    col++;
    end = ctxt->input->end;
    start = in;
    if (in >= end) {
        GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end)
    }
    if (normalize) {
        /*
         * Skip any leading spaces
         */
        while ((in < end) && (*in != limit) &&
               ((*in == 0x20) || (*in == 0x9) ||
                (*in == 0xA) || (*in == 0xD))) {
            if (*in == 0xA) {
                line++; col = 1;
            } else {
                col++;
            }
            in++;
            start = in;
            if (in >= end) {
                GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end)
                if ((in - start) > maxLength) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                   "AttValue length too long\n");
                    return(NULL);
                }
            }
        }
        while ((in < end) && (*in != limit) && (*in >= 0x20) &&
               (*in <= 0x7f) && (*in != '&') && (*in != '<')) {
            col++;
            if ((*in++ == 0x20) && (*in == 0x20)) break;
            if (in >= end) {
                GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end)
                if ((in - start) > maxLength) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                   "AttValue length too long\n");
                    return(NULL);
                }
            }
        }
        last = in;
        /*
         * skip the trailing blanks
         */
        while ((last[-1] == 0x20) && (last > start)) last--;
        while ((in < end) && (*in != limit) &&
               ((*in == 0x20) || (*in == 0x9) ||
                (*in == 0xA) || (*in == 0xD))) {
            if (*in == 0xA) {
                line++, col = 1;
            } else {
                col++;
            }
            in++;
            if (in >= end) {
                const xmlChar *oldbase = ctxt->input->base;
                GROW;
                if (ctxt->instate == XML_PARSER_EOF)
                    return(NULL);
                if (oldbase != ctxt->input->base) {
                    ptrdiff_t delta = ctxt->input->base - oldbase;
                    start = start + delta;
                    in = in + delta;
                    last = last + delta;
                }
                end = ctxt->input->end;
                if ((in - start) > maxLength) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                   "AttValue length too long\n");
                    return(NULL);
                }
            }
        }
        if ((in - start) > maxLength) {
            xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                           "AttValue length too long\n");
            return(NULL);
        }
        if (*in != limit) goto need_complex;
    } else {
        while ((in < end) && (*in != limit) && (*in >= 0x20) &&
               (*in <= 0x7f) && (*in != '&') && (*in != '<')) {
            in++;
            col++;
            if (in >= end) {
                GROW_PARSE_ATT_VALUE_INTERNAL(ctxt, in, start, end)
                if ((in - start) > maxLength) {
                    xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                                   "AttValue length too long\n");
                    return(NULL);
                }
            }
        }
        last = in;
        if ((in - start) > maxLength) {
            xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
                           "AttValue length too long\n");
            return(NULL);
        }
        if (*in != limit) goto need_complex;
    }
    in++;
    col++;
    if (len != NULL) {
        *len = last - start;
        ret = (xmlChar *) start;
    } else {
        if (alloc) *alloc = 1;
        ret = xmlStrndup(start, last - start);
    }
    CUR_PTR = in;
    ctxt->input->line = line;
    ctxt->input->col = col;
    if (alloc) *alloc = 0;
    return ret;
need_complex:
    if (alloc) *alloc = 1;
    return xmlParseAttValueComplex(ctxt, len, normalize);
}

/**
 * xmlParseAttribute2:
 * @ctxt:  an XML parser context
 * @pref:  the element prefix
 * @elem:  the element name
 * @prefix:  a xmlChar ** used to store the value of the attribute prefix
 * @value:  a xmlChar ** used to store the value of the attribute
 * @len:  an int * to save the length of the attribute
 * @alloc:  an int * to indicate if the attribute was allocated
 *
 * parse an attribute in the new SAX2 framework.
 *
 * Returns the attribute name, and the value in *value, .
 */

static const xmlChar *
xmlParseAttribute2(xmlParserCtxtPtr ctxt,
                   const xmlChar * pref, const xmlChar * elem,
                   const xmlChar ** prefix, xmlChar ** value,
                   int *len, int *alloc)
{
    const xmlChar *name;
    xmlChar *val, *internal_val = NULL;
    int normalize = 0;

    *value = NULL;
    GROW;
    name = xmlParseQName(ctxt, prefix);
    if (name == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "error parsing attribute name\n");
        return (NULL);
    }

    /*
     * get the type if needed
     */
    if (ctxt->attsSpecial != NULL) {
        int type;

        type = (int) (ptrdiff_t) xmlHashQLookup2(ctxt->attsSpecial,
                                                 pref, elem, *prefix, name);
        if (type != 0)
            normalize = 1;
    }

    /*
     * read the value
     */
    SKIP_BLANKS;
    if (RAW == '=') {
        NEXT;
        SKIP_BLANKS;
        val = xmlParseAttValueInternal(ctxt, len, alloc, normalize);
        if (normalize) {
            /*
             * Sometimes a second normalisation pass for spaces is needed
             * but that only happens if charrefs or entities references
             * have been used in the attribute value, i.e. the attribute
             * value have been extracted in an allocated string already.
             */
            if (*alloc) {
                const xmlChar *val2;

                val2 = xmlAttrNormalizeSpace2(ctxt, val, len);
                if ((val2 != NULL) && (val2 != val)) {
                    xmlFree(val);
                    val = (xmlChar *) val2;
                }
            }
        }
        ctxt->instate = XML_PARSER_CONTENT;
    } else {
        xmlFatalErrMsgStr(ctxt, XML_ERR_ATTRIBUTE_WITHOUT_VALUE,
                          "Specification mandates value for attribute %s\n",
                          name);
        return (NULL);
    }

    if (*prefix == ctxt->str_xml) {
        /*
         * Check that xml:lang conforms to the specification
         * No more registered as an error, just generate a warning now
         * since this was deprecated in XML second edition
         */
        if ((ctxt->pedantic) && (xmlStrEqual(name, BAD_CAST "lang"))) {
            internal_val = xmlStrndup(val, *len);
            if (!xmlCheckLanguageID(internal_val)) {
                xmlWarningMsg(ctxt, XML_WAR_LANG_VALUE,
                              "Malformed value for xml:lang : %s\n",
                              internal_val, NULL);
            }
        }

        /*
         * Check that xml:space conforms to the specification
         */
        if (xmlStrEqual(name, BAD_CAST "space")) {
            internal_val = xmlStrndup(val, *len);
            if (xmlStrEqual(internal_val, BAD_CAST "default"))
                *(ctxt->space) = 0;
            else if (xmlStrEqual(internal_val, BAD_CAST "preserve"))
                *(ctxt->space) = 1;
            else {
                xmlWarningMsg(ctxt, XML_WAR_SPACE_VALUE,
                              "Invalid value \"%s\" for xml:space : \"default\" or \"preserve\" expected\n",
                              internal_val, NULL);
            }
        }
        if (internal_val) {
            xmlFree(internal_val);
        }
    }

    *value = val;
    return (name);
}
/**
 * xmlParseStartTag2:
 * @ctxt:  an XML parser context
 *
 * parse a start of tag either for rule element or
 * EmptyElement. In both case we don't parse the tag closing chars.
 * This routine is called when running SAX2 parsing
 *
 * [40] STag ::= '<' Name (S Attribute)* S? '>'
 *
 * [ WFC: Unique Att Spec ]
 * No attribute name may appear more than once in the same start-tag or
 * empty-element tag.
 *
 * [44] EmptyElemTag ::= '<' Name (S Attribute)* S? '/>'
 *
 * [ WFC: Unique Att Spec ]
 * No attribute name may appear more than once in the same start-tag or
 * empty-element tag.
 *
 * With namespace:
 *
 * [NS 8] STag ::= '<' QName (S Attribute)* S? '>'
 *
 * [NS 10] EmptyElement ::= '<' QName (S Attribute)* S? '/>'
 *
 * Returns the element name parsed
 */

static const xmlChar *
xmlParseStartTag2(xmlParserCtxtPtr ctxt, const xmlChar **pref,
                  const xmlChar **URI, int *tlen) {
    const xmlChar *localname;
    const xmlChar *prefix;
    const xmlChar *attname;
    const xmlChar *aprefix;
    const xmlChar *nsname;
    xmlChar *attvalue;
    const xmlChar **atts = ctxt->atts;
    int maxatts = ctxt->maxatts;
    int nratts, nbatts, nbdef, inputid;
    int i, j, nbNs, attval;
    unsigned long cur;
    int nsNr = ctxt->nsNr;

    if (RAW != '<') return(NULL);
    NEXT1;

    /*
     * NOTE: it is crucial with the SAX2 API to never call SHRINK beyond that
     *       point since the attribute values may be stored as pointers to
     *       the buffer and calling SHRINK would destroy them !
     *       The Shrinking is only possible once the full set of attribute
     *       callbacks have been done.
     */
    SHRINK;
    cur = ctxt->input->cur - ctxt->input->base;
    inputid = ctxt->input->id;
    nbatts = 0;
    nratts = 0;
    nbdef = 0;
    nbNs = 0;
    attval = 0;
    /* Forget any namespaces added during an earlier parse of this element. */
    ctxt->nsNr = nsNr;

    localname = xmlParseQName(ctxt, &prefix);
    if (localname == NULL) {
        xmlFatalErrMsg(ctxt, XML_ERR_NAME_REQUIRED,
                       "StartTag: invalid element name\n");
        return(NULL);
    }
    *tlen = ctxt->input->cur - ctxt->input->base - cur;

    /*
     * Now parse the attributes, it ends up with the ending
     *
     * (S Attribute)* S?
     */
    SKIP_BLANKS;
    GROW;

    while (((RAW != '>') &&
           ((RAW != '/') || (NXT(1) != '>')) &&
           (IS_BYTE_CHAR(RAW))) && (ctxt->instate != XML_PARSER_EOF)) {
        int id = ctxt->input->id;
        unsigned long cons = CUR_CONSUMED;
        int len = -1, alloc = 0;

        attname = xmlParseAttribute2(ctxt, prefix, localname,
                                     &aprefix, &attvalue, &len, &alloc);
        if ((attname == NULL) || (attvalue == NULL))
            goto next_attr;
        if (len < 0) len = xmlStrlen(attvalue);

        if ((attname == ctxt->str_xmlns) && (aprefix == NULL)) {
            const xmlChar *URL = xmlDictLookup(ctxt->dict, attvalue, len);
            xmlURIPtr uri;

            if (URL == NULL) {
                xmlErrMemory(ctxt, "dictionary allocation failure");
                if ((attvalue != NULL) && (alloc != 0))
                    xmlFree(attvalue);
                localname = NULL;
                goto done;
            }
            if (*URL != 0) {
                uri = xmlParseURI((const char *) URL);
                if (uri == NULL) {
                    xmlNsErr(ctxt, XML_WAR_NS_URI,
                             "xmlns: '%s' is not a valid URI\n",
                                       URL, NULL, NULL);
                } else {
                    if (uri->scheme == NULL) {
                        xmlNsWarn(ctxt, XML_WAR_NS_URI_RELATIVE,
                                  "xmlns: URI %s is not absolute\n",
                                  URL, NULL, NULL);
                    }
                    xmlFreeURI(uri);
                }
                if (URL == ctxt->str_xml_ns) {
                    if (attname != ctxt->str_xml) {
                        xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                     "xml namespace URI cannot be the default namespace\n",
                                 NULL, NULL, NULL);
                    }
                    goto next_attr;
                }
                if ((len == 29) &&
                    (xmlStrEqual(URL,
                             BAD_CAST "http://www.w3.org/2000/xmlns/"))) {
                    xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                         "reuse of the xmlns namespace name is forbidden\n",
                             NULL, NULL, NULL);
                    goto next_attr;
                }
            }
            /*
             * check that it's not a defined namespace
             */
            for (j = 1;j <= nbNs;j++)
                if (ctxt->nsTab[ctxt->nsNr - 2 * j] == NULL)
                    break;
            if (j <= nbNs)
                xmlErrAttributeDup(ctxt, NULL, attname);
            else
                if (nsPush(ctxt, NULL, URL) > 0) nbNs++;

        } else if (aprefix == ctxt->str_xmlns) {
            const xmlChar *URL = xmlDictLookup(ctxt->dict, attvalue, len);
            xmlURIPtr uri;

            if (attname == ctxt->str_xml) {
                if (URL != ctxt->str_xml_ns) {
                    xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                             "xml namespace prefix mapped to wrong URI\n",
                             NULL, NULL, NULL);
                }
                /*
                 * Do not keep a namespace definition node
                 */
                goto next_attr;
            }
            if (URL == ctxt->str_xml_ns) {
                if (attname != ctxt->str_xml) {
                    xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                             "xml namespace URI mapped to wrong prefix\n",
                             NULL, NULL, NULL);
                }
                goto next_attr;
            }
            if (attname == ctxt->str_xmlns) {
                xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                         "redefinition of the xmlns prefix is forbidden\n",
                         NULL, NULL, NULL);
                goto next_attr;
            }
            if ((len == 29) &&
                (xmlStrEqual(URL,
                             BAD_CAST "http://www.w3.org/2000/xmlns/"))) {
                xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                         "reuse of the xmlns namespace name is forbidden\n",
                         NULL, NULL, NULL);
                goto next_attr;
            }
            if ((URL == NULL) || (URL[0] == 0)) {
                xmlNsErr(ctxt, XML_NS_ERR_XML_NAMESPACE,
                         "xmlns:%s: Empty XML namespace is not allowed\n",
                              attname, NULL, NULL);
                goto next_attr;
            } else {
                uri = xmlParseURI((const char *) URL);
                if (uri == NULL) {
                    xmlNsErr(ctxt, XML_WAR_NS_URI,
                         "xmlns:%s: '%s' is not a valid URI\n",
                                       attname, URL, NULL);
                } else {
                    if ((ctxt->pedantic) && (uri->scheme == NULL)) {
                        xmlNsWarn(ctxt, XML_WAR_NS_URI_RELATIVE,
                                  "xmlns:%s: URI %s is not absolute\n",
                                  attname, URL, NULL);
                    }
                    xmlFreeURI(uri);
                }
            }

            /*
             * check that it's not a defined namespace
             */
            for (j = 1;j <= nbNs;j++)
                if (ctxt->nsTab[ctxt->nsNr - 2 * j] == attname)
                    break;
            if (j <= nbNs)
                xmlErrAttributeDup(ctxt, aprefix, attname);
            else
                if (nsPush(ctxt, attname, URL) > 0) nbNs++;

        } else {
            /*
             * Add the pair to atts
             */
            if ((atts == NULL) || (nbatts + 5 > maxatts)) {
                if (xmlCtxtGrowAttrs(ctxt, nbatts + 5) < 0) {
                    goto next_attr;
                }
                maxatts = ctxt->maxatts;
                atts = ctxt->atts;
            }
            ctxt->attallocs[nratts++] = alloc;
            atts[nbatts++] = attname;
            atts[nbatts++] = aprefix;
            /*
             * The namespace URI field is used temporarily to point at the
             * base of the current input buffer for non-alloced attributes.
             * When the input buffer is reallocated, all the pointers become
             * invalid, but they can be reconstructed later.
             */
            if (alloc)
                atts[nbatts++] = NULL;
            else
                atts[nbatts++] = ctxt->input->base;
            atts[nbatts++] = attvalue;
            attvalue += len;
            atts[nbatts++] = attvalue;
            /*
             * tag if some deallocation is needed
             */
            if (alloc != 0) attval = 1;
            attvalue = NULL; /* moved into atts */
        }

next_attr:
        if ((attvalue != NULL) && (alloc != 0)) {
            xmlFree(attvalue);
            attvalue = NULL;
        }

        GROW
        if (ctxt->instate == XML_PARSER_EOF)
            break;
        if ((RAW == '>') || (((RAW == '/') && (NXT(1) == '>'))))
            break;
        if (SKIP_BLANKS == 0) {
            xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                           "attributes construct error\n");
            break;
        }
        if ((cons == CUR_CONSUMED) && (id == ctxt->input->id) &&
            (attname == NULL) && (attvalue == NULL)) {
            xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                 "xmlParseStartTag: problem parsing attributes\n");
            break;
        }
        GROW;
    }

    if (ctxt->input->id != inputid) {
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                    "Unexpected change of input\n");
        localname = NULL;
        goto done;
    }

    /* Reconstruct attribute value pointers. */
    for (i = 0, j = 0; j < nratts; i += 5, j++) {
        if (atts[i+2] != NULL) {
            /*
             * Arithmetic on dangling pointers is technically undefined
             * behavior, but well...
             */
            ptrdiff_t offset = ctxt->input->base - atts[i+2];
            atts[i+2]  = NULL;    /* Reset repurposed namespace URI */
            atts[i+3] += offset;  /* value */
            atts[i+4] += offset;  /* valuend */
        }
    }

    /*
     * The attributes defaulting
     */
    if (ctxt->attsDefault != NULL) {
        xmlDefAttrsPtr defaults;

        defaults = xmlHashLookup2(ctxt->attsDefault, localname, prefix);
        if (defaults != NULL) {
            for (i = 0;i < defaults->nbAttrs;i++) {
                attname = defaults->values[5 * i];
                aprefix = defaults->values[5 * i + 1];

                /*
                 * special work for namespaces defaulted defs
                 */
                if ((attname == ctxt->str_xmlns) && (aprefix == NULL)) {
                    /*
                     * check that it's not a defined namespace
                     */
                    for (j = 1;j <= nbNs;j++)
                        if (ctxt->nsTab[ctxt->nsNr - 2 * j] == NULL)
                            break;
                    if (j <= nbNs) continue;

                    nsname = xmlGetNamespace(ctxt, NULL);
                    if (nsname != defaults->values[5 * i + 2]) {
                        if (nsPush(ctxt, NULL,
                                   defaults->values[5 * i + 2]) > 0)
                            nbNs++;
                    }
                } else if (aprefix == ctxt->str_xmlns) {
                    /*
                     * check that it's not a defined namespace
                     */
                    for (j = 1;j <= nbNs;j++)
                        if (ctxt->nsTab[ctxt->nsNr - 2 * j] == attname)
                            break;
                    if (j <= nbNs) continue;

                    nsname = xmlGetNamespace(ctxt, attname);
                    if (nsname != defaults->values[2]) {
                        if (nsPush(ctxt, attname,
                                   defaults->values[5 * i + 2]) > 0)
                            nbNs++;
                    }
                } else {
                    /*
                     * check that it's not a defined attribute
                     */
                    for (j = 0;j < nbatts;j+=5) {
                        if ((attname == atts[j]) && (aprefix == atts[j+1]))
                            break;
                    }
                    if (j < nbatts) continue;

                    if ((atts == NULL) || (nbatts + 5 > maxatts)) {
                        if (xmlCtxtGrowAttrs(ctxt, nbatts + 5) < 0) {
                            localname = NULL;
                            goto done;
                        }
                        maxatts = ctxt->maxatts;
                        atts = ctxt->atts;
                    }
                    atts[nbatts++] = attname;
                    atts[nbatts++] = aprefix;
                    if (aprefix == NULL)
                        atts[nbatts++] = NULL;
                    else
                        atts[nbatts++] = xmlGetNamespace(ctxt, aprefix);
                    atts[nbatts++] = defaults->values[5 * i + 2];
                    atts[nbatts++] = defaults->values[5 * i + 3];
                    if ((ctxt->standalone == 1) &&
                        (defaults->values[5 * i + 4] != NULL)) {
                        xmlValidityError(ctxt, XML_DTD_STANDALONE_DEFAULTED,
          "standalone: attribute %s on %s defaulted from external subset\n",
                                         attname, localname);
                    }
                    nbdef++;
                }
            }
        }
    }

    /*
     * The attributes checkings
     */
    for (i = 0; i < nbatts;i += 5) {
        /*
        * The default namespace does not apply to attribute names.
        */
        if (atts[i + 1] != NULL) {
            nsname = xmlGetNamespace(ctxt, atts[i + 1]);
            if (nsname == NULL) {
                xmlNsErr(ctxt, XML_NS_ERR_UNDEFINED_NAMESPACE,
                    "Namespace prefix %s for %s on %s is not defined\n",
                    atts[i + 1], atts[i], localname);
            }
            atts[i + 2] = nsname;
        } else
            nsname = NULL;
        /*
         * [ WFC: Unique Att Spec ]
         * No attribute name may appear more than once in the same
         * start-tag or empty-element tag.
         * As extended by the Namespace in XML REC.
         */
        for (j = 0; j < i;j += 5) {
            if (atts[i] == atts[j]) {
                if (atts[i+1] == atts[j+1]) {
                    xmlErrAttributeDup(ctxt, atts[i+1], atts[i]);
                    break;
                }
                if ((nsname != NULL) && (atts[j + 2] == nsname)) {
                    xmlNsErr(ctxt, XML_NS_ERR_ATTRIBUTE_REDEFINED,
                             "Namespaced Attribute %s in '%s' redefined\n",
                             atts[i], nsname, NULL);
                    break;
                }
            }
        }
    }

    nsname = xmlGetNamespace(ctxt, prefix);
    if ((prefix != NULL) && (nsname == NULL)) {
        xmlNsErr(ctxt, XML_NS_ERR_UNDEFINED_NAMESPACE,
                 "Namespace prefix %s on %s is not defined\n",
                 prefix, localname, NULL);
    }
    *pref = prefix;
    *URI = nsname;

    /*
     * SAX: Start of Element !
     */
    if ((ctxt->sax != NULL) && (ctxt->sax->startElementNs != NULL) &&
        (!ctxt->disableSAX)) {
        if (nbNs > 0)
            ctxt->sax->startElementNs(ctxt->userData, localname, prefix,
                          nsname, nbNs, &ctxt->nsTab[ctxt->nsNr - 2 * nbNs],
                          nbatts / 5, nbdef, atts);
        else
            ctxt->sax->startElementNs(ctxt->userData, localname, prefix,
                          nsname, 0, NULL, nbatts / 5, nbdef, atts);
    }

done:
    /*
     * Free up attribute allocated strings if needed
     */
    if (attval != 0) {
        for (i = 3,j = 0; j < nratts;i += 5,j++)
            if ((ctxt->attallocs[j] != 0) && (atts[i] != NULL))
                xmlFree((xmlChar *) atts[i]);
    }

    return(localname);
}

/**
 * xmlParseEndTag2:
 * @ctxt:  an XML parser context
 * @line:  line of the start tag
 * @nsNr:  number of namespaces on the start tag
 *
 * parse an end of tag
 *
 * [42] ETag ::= '</' Name S? '>'
 *
 * With namespace
 *
 * [NS 9] ETag ::= '</' QName S? '>'
 */

static void
xmlParseEndTag2(xmlParserCtxtPtr ctxt, const xmlStartTag *tag) {
    const xmlChar *name;

    GROW;
    if ((RAW != '<') || (NXT(1) != '/')) {
        xmlFatalErr(ctxt, XML_ERR_LTSLASH_REQUIRED, NULL);
        return;
    }
    SKIP(2);

    if (tag->prefix == NULL)
        name = xmlParseNameAndCompare(ctxt, ctxt->name);
    else
        name = xmlParseQNameAndCompare(ctxt, ctxt->name, tag->prefix);

    /*
     * We should definitely be at the ending "S? '>'" part
     */
    GROW;
    if (ctxt->instate == XML_PARSER_EOF)
        return;
    SKIP_BLANKS;
    if ((!IS_BYTE_CHAR(RAW)) || (RAW != '>')) {
        xmlFatalErr(ctxt, XML_ERR_GT_REQUIRED, NULL);
    } else
        NEXT1;

    /*
     * [ WFC: Element Type Match ]
     * The Name in an element's end-tag must match the element type in the
     * start-tag.
     *
     */
    if (name != (xmlChar*)1) {
        if (name == NULL) name = BAD_CAST "unparsable";
        xmlFatalErrMsgStrIntStr(ctxt, XML_ERR_TAG_NAME_MISMATCH,
                     "Opening and ending tag mismatch: %s line %d and %s\n",
                                ctxt->name, tag->line, name);
    }

    /*
     * SAX: End of Tag
     */
    if ((ctxt->sax != NULL) && (ctxt->sax->endElementNs != NULL) &&
        (!ctxt->disableSAX))
        ctxt->sax->endElementNs(ctxt->userData, ctxt->name, tag->prefix,
                                tag->URI);

    spacePop(ctxt);
    if (tag->nsNr != 0)
        nsPop(ctxt, tag->nsNr);
}

/**
 * xmlParseCDSect:
 * @ctxt:  an XML parser context
 *
 * Parse escaped pure raw content.
 *
 * [18] CDSect ::= CDStart CData CDEnd
 *
 * [19] CDStart ::= '<![CDATA['
 *
 * [20] Data ::= (Char* - (Char* ']]>' Char*))
 *
 * [21] CDEnd ::= ']]>'
 */
void
xmlParseCDSect(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = XML_PARSER_BUFFER_SIZE;
    int r, rl;
    int s, sl;
    int cur, l;
    int count = 0;
    int maxLength = (ctxt->options & XML_PARSE_HUGE) ?
                    XML_MAX_HUGE_LENGTH :
                    XML_MAX_TEXT_LENGTH;

    /* Check 2.6.0 was NXT(0) not RAW */
    if (CMP9(CUR_PTR, '<', '!', '[', 'C', 'D', 'A', 'T', 'A', '[')) {
        SKIP(9);
    } else
        return;

    ctxt->instate = XML_PARSER_CDATA_SECTION;
    r = CUR_CHAR(rl);
    if (!IS_CHAR(r)) {
        xmlFatalErr(ctxt, XML_ERR_CDATA_NOT_FINISHED, NULL);
        ctxt->instate = XML_PARSER_CONTENT;
        return;
    }
    NEXTL(rl);
    s = CUR_CHAR(sl);
    if (!IS_CHAR(s)) {
        xmlFatalErr(ctxt, XML_ERR_CDATA_NOT_FINISHED, NULL);
        ctxt->instate = XML_PARSER_CONTENT;
        return;
    }
    NEXTL(sl);
    cur = CUR_CHAR(l);
    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
    if (buf == NULL) {
        xmlErrMemory(ctxt, NULL);
        return;
    }
    while (IS_CHAR(cur) &&
           ((r != ']') || (s != ']') || (cur != '>'))) {
        if (len + 5 >= size) {
            xmlChar *tmp;

            tmp = (xmlChar *) xmlRealloc(buf, size * 2 * sizeof(xmlChar));
            if (tmp == NULL) {
                xmlFree(buf);
                xmlErrMemory(ctxt, NULL);
                return;
            }
            buf = tmp;
            size *= 2;
        }
        COPY_BUF(rl,buf,len,r);
        r = s;
        rl = sl;
        s = cur;
        sl = l;
        count++;
        if (count > 50) {
            SHRINK;
            GROW;
            if (ctxt->instate == XML_PARSER_EOF) {
                xmlFree(buf);
                return;
            }
            count = 0;
        }
        NEXTL(l);
        cur = CUR_CHAR(l);
        if (len > maxLength) {
            xmlFatalErrMsg(ctxt, XML_ERR_CDATA_NOT_FINISHED,
                           "CData section too big found\n");
            xmlFree(buf);
            return;
        }
    }
    buf[len] = 0;
    ctxt->instate = XML_PARSER_CONTENT;
    if (cur != '>') {
        xmlFatalErrMsgStr(ctxt, XML_ERR_CDATA_NOT_FINISHED,
                             "CData section not finished\n%.50s\n", buf);
        xmlFree(buf);
        return;
    }
    NEXTL(l);

    /*
     * OK the buffer is to be consumed as cdata.
     */
    if ((ctxt->sax != NULL) && (!ctxt->disableSAX)) {
        if (ctxt->sax->cdataBlock != NULL)
            ctxt->sax->cdataBlock(ctxt->userData, buf, len);
        else if (ctxt->sax->characters != NULL)
            ctxt->sax->characters(ctxt->userData, buf, len);
    }
    xmlFree(buf);
}

/**
 * xmlParseContentInternal:
 * @ctxt:  an XML parser context
 *
 * Parse a content sequence. Stops at EOF or '</'. Leaves checking of
 * unexpected EOF to the caller.
 */

static void
xmlParseContentInternal(xmlParserCtxtPtr ctxt) {
    int nameNr = ctxt->nameNr;

    GROW;
    while ((RAW != 0) &&
           (ctxt->instate != XML_PARSER_EOF)) {
        int id = ctxt->input->id;
        unsigned long cons = CUR_CONSUMED;
        const xmlChar *cur = ctxt->input->cur;

        /*
         * First case : a Processing Instruction.
         */
        if ((*cur == '<') && (cur[1] == '?')) {
            xmlParsePI(ctxt);
        }

        /*
         * Second case : a CDSection
         */
        /* 2.6.0 test was *cur not RAW */
        else if (CMP9(CUR_PTR, '<', '!', '[', 'C', 'D', 'A', 'T', 'A', '[')) {
            xmlParseCDSect(ctxt);
        }

        /*
         * Third case :  a comment
         */
        else if ((*cur == '<') && (NXT(1) == '!') &&
                 (NXT(2) == '-') && (NXT(3) == '-')) {
            xmlParseComment(ctxt);
            ctxt->instate = XML_PARSER_CONTENT;
        }

        /*
         * Fourth case :  a sub-element.
         */
        else if (*cur == '<') {
            if (NXT(1) == '/') {
                if (ctxt->nameNr <= nameNr)
                    break;
                xmlParseElementEnd(ctxt);
            } else {
                xmlParseElementStart(ctxt);
            }
        }

        /*
         * Fifth case : a reference. If if has not been resolved,
         *    parsing returns it's Name, create the node
         */

        else if (*cur == '&') {
            xmlParseReference(ctxt);
        }

        /*
         * Last case, text. Note that References are handled directly.
         */
        else {
            xmlParseCharData(ctxt, 0);
        }

        GROW;
        SHRINK;

        if ((cons == CUR_CONSUMED) && (id == ctxt->input->id)) {
            xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                        "detected an error in element content\n");
            xmlHaltParser(ctxt);
            break;
        }
    }
}

/**
 * xmlParseContent:
 * @ctxt:  an XML parser context
 *
 * Parse a content sequence. Stops at EOF or '</'.
 *
 * [43] content ::= (element | CharData | Reference | CDSect | PI | Comment)*
 */

void
xmlParseContent(xmlParserCtxtPtr ctxt) {
    int nameNr = ctxt->nameNr;

    xmlParseContentInternal(ctxt);

    if ((ctxt->instate != XML_PARSER_EOF) && (ctxt->nameNr > nameNr)) {
        const xmlChar *name = ctxt->nameTab[ctxt->nameNr - 1];
        int line = ctxt->pushTab[ctxt->nameNr - 1].line;
        xmlFatalErrMsgStrIntStr(ctxt, XML_ERR_TAG_NOT_FINISHED,
                "Premature end of data in tag %s line %d\n",
                name, line, NULL);
    }
}

/**
 * xmlParseElement:
 * @ctxt:  an XML parser context
 *
 * parse an XML element
 *
 * [39] element ::= EmptyElemTag | STag content ETag
 *
 * [ WFC: Element Type Match ]
 * The Name in an element's end-tag must match the element type in the
 * start-tag.
 *
 */

void
xmlParseElement(xmlParserCtxtPtr ctxt) {
    if (xmlParseElementStart(ctxt) != 0)
        return;

    xmlParseContentInternal(ctxt);
    if (ctxt->instate == XML_PARSER_EOF)
        return;

    if (CUR == 0) {
        const xmlChar *name = ctxt->nameTab[ctxt->nameNr - 1];
        int line = ctxt->pushTab[ctxt->nameNr - 1].line;
        xmlFatalErrMsgStrIntStr(ctxt, XML_ERR_TAG_NOT_FINISHED,
                "Premature end of data in tag %s line %d\n",
                name, line, NULL);
        return;
    }

    xmlParseElementEnd(ctxt);
}

/**
 * xmlParseElementStart:
 * @ctxt:  an XML parser context
 *
 * Parse the start of an XML element. Returns -1 in case of error, 0 if an
 * opening tag was parsed, 1 if an empty element was parsed.
 */
static int
xmlParseElementStart(xmlParserCtxtPtr ctxt) {
    const xmlChar *name;
    const xmlChar *prefix = NULL;
    const xmlChar *URI = NULL;
    xmlParserNodeInfo node_info;
    int line, tlen = 0;
    xmlNodePtr ret;
    int nsNr = ctxt->nsNr;

    if (((unsigned int) ctxt->nameNr > xmlParserMaxDepth) &&
        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
        xmlFatalErrMsgInt(ctxt, XML_ERR_INTERNAL_ERROR,
                 "Excessive depth in document: %d use XML_PARSE_HUGE option\n",
                          xmlParserMaxDepth);
        xmlHaltParser(ctxt);
        return(-1);
    }

    /* Capture start position */
    if (ctxt->record_info) {
        node_info.begin_pos = ctxt->input->consumed +
                          (CUR_PTR - ctxt->input->base);
        node_info.begin_line = ctxt->input->line;
    }

    if (ctxt->spaceNr == 0)
        spacePush(ctxt, -1);
    else if (*ctxt->space == -2)
        spacePush(ctxt, -1);
    else
        spacePush(ctxt, *ctxt->space);

    line = ctxt->input->line;
#ifdef LIBXML_SAX1_ENABLED
    if (ctxt->sax2)
#endif /* LIBXML_SAX1_ENABLED */
        name = xmlParseStartTag2(ctxt, &prefix, &URI, &tlen);
#ifdef LIBXML_SAX1_ENABLED
    else
        name = xmlParseStartTag(ctxt);
#endif /* LIBXML_SAX1_ENABLED */
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);
    if (name == NULL) {
        spacePop(ctxt);
        return(-1);
    }
    nameNsPush(ctxt, name, prefix, URI, line, ctxt->nsNr - nsNr);
    ret = ctxt->node;

#ifdef LIBXML_VALID_ENABLED
    /*
     * [ VC: Root Element Type ]
     * The Name in the document type declaration must match the element
     * type of the root element.
     */
    if (ctxt->validate && ctxt->wellFormed && ctxt->myDoc &&
        ctxt->node && (ctxt->node == ctxt->myDoc->children))
        ctxt->valid &= xmlValidateRoot(&ctxt->vctxt, ctxt->myDoc);
#endif /* LIBXML_VALID_ENABLED */

    /*
     * Check for an Empty Element.
     */
    if ((RAW == '/') && (NXT(1) == '>')) {
        SKIP(2);
        if (ctxt->sax2) {
            if ((ctxt->sax != NULL) && (ctxt->sax->endElementNs != NULL) &&
                (!ctxt->disableSAX))
                ctxt->sax->endElementNs(ctxt->userData, name, prefix, URI);
#ifdef LIBXML_SAX1_ENABLED
        } else {
            if ((ctxt->sax != NULL) && (ctxt->sax->endElement != NULL) &&
                (!ctxt->disableSAX))
                ctxt->sax->endElement(ctxt->userData, name);
#endif /* LIBXML_SAX1_ENABLED */
        }
        namePop(ctxt);
        spacePop(ctxt);
        if (nsNr != ctxt->nsNr)
            nsPop(ctxt, ctxt->nsNr - nsNr);
        if ( ret != NULL && ctxt->record_info ) {
           node_info.end_pos = ctxt->input->consumed +
                              (CUR_PTR - ctxt->input->base);
           node_info.end_line = ctxt->input->line;
           node_info.node = ret;
           xmlParserAddNodeInfo(ctxt, &node_info);
        }
        return(1);
    }
    if (RAW == '>') {
        NEXT1;
    } else {
        xmlFatalErrMsgStrIntStr(ctxt, XML_ERR_GT_REQUIRED,
                     "Couldn't find end of Start Tag %s line %d\n",
                                name, line, NULL);

        /*
         * end of parsing of this node.
         */
        nodePop(ctxt);
        namePop(ctxt);
        spacePop(ctxt);
        if (nsNr != ctxt->nsNr)
            nsPop(ctxt, ctxt->nsNr - nsNr);

        /*
         * Capture end position and add node
         */
        if ( ret != NULL && ctxt->record_info ) {
           node_info.end_pos = ctxt->input->consumed +
                              (CUR_PTR - ctxt->input->base);
           node_info.end_line = ctxt->input->line;
           node_info.node = ret;
           xmlParserAddNodeInfo(ctxt, &node_info);
        }
        return(-1);
    }

    return(0);
}

/**
 * xmlParseElementEnd:
 * @ctxt:  an XML parser context
 *
 * Parse the end of an XML element.
 */
static void
xmlParseElementEnd(xmlParserCtxtPtr ctxt) {
    xmlParserNodeInfo node_info;
    xmlNodePtr ret = ctxt->node;

    if (ctxt->nameNr <= 0)
        return;

    /*
     * parse the end of tag: '</' should be here.
     */
    if (ctxt->sax2) {
        xmlParseEndTag2(ctxt, &ctxt->pushTab[ctxt->nameNr - 1]);
        namePop(ctxt);
    }
#ifdef LIBXML_SAX1_ENABLED
    else
        xmlParseEndTag1(ctxt, 0);
#endif /* LIBXML_SAX1_ENABLED */

    /*
     * Capture end position and add node
     */
    if ( ret != NULL && ctxt->record_info ) {
       node_info.end_pos = ctxt->input->consumed +
                          (CUR_PTR - ctxt->input->base);
       node_info.end_line = ctxt->input->line;
       node_info.node = ret;
       xmlParserAddNodeInfo(ctxt, &node_info);
    }
}

/**
 * xmlParseVersionNum:
 * @ctxt:  an XML parser context
 *
 * parse the XML version value.
 *
 * [26] VersionNum ::= '1.' [0-9]+
 *
 * In practice allow [0-9].[0-9]+ at that level
 *
 * Returns the string giving the XML version number, or NULL
 */
xmlChar *
xmlParseVersionNum(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = 10;
    xmlChar cur;

    buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
    if (buf == NULL) {
        xmlErrMemory(ctxt, NULL);
        return(NULL);
    }
    cur = CUR;
    if (!((cur >= '0') && (cur <= '9'))) {
        xmlFree(buf);
        return(NULL);
    }
    buf[len++] = cur;
    NEXT;
    cur=CUR;
    if (cur != '.') {
        xmlFree(buf);
        return(NULL);
    }
    buf[len++] = cur;
    NEXT;
    cur=CUR;
    while ((cur >= '0') && (cur <= '9')) {
        if (len + 1 >= size) {
            xmlChar *tmp;

            size *= 2;
            tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
            if (tmp == NULL) {
                xmlFree(buf);
                xmlErrMemory(ctxt, NULL);
                return(NULL);
            }
            buf = tmp;
        }
        buf[len++] = cur;
        NEXT;
        cur=CUR;
    }
    buf[len] = 0;
    return(buf);
}

/**
 * xmlParseVersionInfo:
 * @ctxt:  an XML parser context
 *
 * parse the XML version.
 *
 * [24] VersionInfo ::= S 'version' Eq (' VersionNum ' | " VersionNum ")
 *
 * [25] Eq ::= S? '=' S?
 *
 * Returns the version string, e.g. "1.0"
 */

xmlChar *
xmlParseVersionInfo(xmlParserCtxtPtr ctxt) {
    xmlChar *version = NULL;

    if (CMP7(CUR_PTR, 'v', 'e', 'r', 's', 'i', 'o', 'n')) {
        SKIP(7);
        SKIP_BLANKS;
        if (RAW != '=') {
            xmlFatalErr(ctxt, XML_ERR_EQUAL_REQUIRED, NULL);
            return(NULL);
        }
        NEXT;
        SKIP_BLANKS;
        if (RAW == '"') {
            NEXT;
            version = xmlParseVersionNum(ctxt);
            if (RAW != '"') {
                xmlFatalErr(ctxt, XML_ERR_STRING_NOT_CLOSED, NULL);
            } else
                NEXT;
        } else if (RAW == '\''){
            NEXT;
            version = xmlParseVersionNum(ctxt);
            if (RAW != '\'') {
                xmlFatalErr(ctxt, XML_ERR_STRING_NOT_CLOSED, NULL);
            } else
                NEXT;
        } else {
            xmlFatalErr(ctxt, XML_ERR_STRING_NOT_STARTED, NULL);
        }
    }
    return(version);
}

/**
 * xmlParseEncName:
 * @ctxt:  an XML parser context
 *
 * parse the XML encoding name
 *
 * [81] EncName ::= [A-Za-z] ([A-Za-z0-9._] | '-')*
 *
 * Returns the encoding name value or NULL
 */
xmlChar *
xmlParseEncName(xmlParserCtxtPtr ctxt) {
    xmlChar *buf = NULL;
    int len = 0;
    int size = 10;
    xmlChar cur;

    cur = CUR;
    if (((cur >= 'a') && (cur <= 'z')) ||
        ((cur >= 'A') && (cur <= 'Z'))) {
        buf = (xmlChar *) xmlMallocAtomic(size * sizeof(xmlChar));
        if (buf == NULL) {
            xmlErrMemory(ctxt, NULL);
            return(NULL);
        }

        buf[len++] = cur;
        NEXT;
        cur = CUR;
        while (((cur >= 'a') && (cur <= 'z')) ||
               ((cur >= 'A') && (cur <= 'Z')) ||
               ((cur >= '0') && (cur <= '9')) ||
               (cur == '.') || (cur == '_') ||
               (cur == '-')) {
            if (len + 1 >= size) {
                xmlChar *tmp;

                size *= 2;
                tmp = (xmlChar *) xmlRealloc(buf, size * sizeof(xmlChar));
                if (tmp == NULL) {
                    xmlErrMemory(ctxt, NULL);
                    xmlFree(buf);
                    return(NULL);
                }
                buf = tmp;
            }
            buf[len++] = cur;
            NEXT;
            cur = CUR;
            if (cur == 0) {
                SHRINK;
                GROW;
                cur = CUR;
            }
        }
        buf[len] = 0;
    } else {
        xmlFatalErr(ctxt, XML_ERR_ENCODING_NAME, NULL);
    }
    return(buf);
}

/**
 * xmlParseEncodingDecl:
 * @ctxt:  an XML parser context
 *
 * parse the XML encoding declaration
 *
 * [80] EncodingDecl ::= S 'encoding' Eq ('"' EncName '"' |  "'" EncName "'")
 *
 * this setups the conversion filters.
 *
 * Returns the encoding value or NULL
 */

const xmlChar *
xmlParseEncodingDecl(xmlParserCtxtPtr ctxt) {
    xmlChar *encoding = NULL;

    SKIP_BLANKS;
    if (CMP8(CUR_PTR, 'e', 'n', 'c', 'o', 'd', 'i', 'n', 'g')) {
        SKIP(8);
        SKIP_BLANKS;
        if (RAW != '=') {
            xmlFatalErr(ctxt, XML_ERR_EQUAL_REQUIRED, NULL);
            return(NULL);
        }
        NEXT;
        SKIP_BLANKS;
        if (RAW == '"') {
            NEXT;
            encoding = xmlParseEncName(ctxt);
            if (RAW != '"') {
                xmlFatalErr(ctxt, XML_ERR_STRING_NOT_CLOSED, NULL);
                xmlFree((xmlChar *) encoding);
                return(NULL);
            } else
                NEXT;
        } else if (RAW == '\''){
            NEXT;
            encoding = xmlParseEncName(ctxt);
            if (RAW != '\'') {
                xmlFatalErr(ctxt, XML_ERR_STRING_NOT_CLOSED, NULL);
                xmlFree((xmlChar *) encoding);
                return(NULL);
            } else
                NEXT;
        } else {
            xmlFatalErr(ctxt, XML_ERR_STRING_NOT_STARTED, NULL);
        }

        /*
         * Non standard parsing, allowing the user to ignore encoding
         */
        if (ctxt->options & XML_PARSE_IGNORE_ENC) {
            xmlFree((xmlChar *) encoding);
            return(NULL);
        }

        /*
         * UTF-16 encoding switch has already taken place at this stage,
         * more over the little-endian/big-endian selection is already done
         */
        if ((encoding != NULL) &&
            ((!xmlStrcasecmp(encoding, BAD_CAST "UTF-16")) ||
             (!xmlStrcasecmp(encoding, BAD_CAST "UTF16")))) {
            /*
             * If no encoding was passed to the parser, that we are
             * using UTF-16 and no decoder is present i.e. the
             * document is apparently UTF-8 compatible, then raise an
             * encoding mismatch fatal error
             */
            if ((ctxt->encoding == NULL) &&
                (ctxt->input->buf != NULL) &&
                (ctxt->input->buf->encoder == NULL)) {
                xmlFatalErrMsg(ctxt, XML_ERR_INVALID_ENCODING,
                  "Document labelled UTF-16 but has UTF-8 content\n");
            }
            if (ctxt->encoding != NULL)
                xmlFree((xmlChar *) ctxt->encoding);
            ctxt->encoding = encoding;
        }
        /*
         * UTF-8 encoding is handled natively
         */
        else if ((encoding != NULL) &&
            ((!xmlStrcasecmp(encoding, BAD_CAST "UTF-8")) ||
             (!xmlStrcasecmp(encoding, BAD_CAST "UTF8")))) {
            if (ctxt->encoding != NULL)
                xmlFree((xmlChar *) ctxt->encoding);
            ctxt->encoding = encoding;
        }
        else if (encoding != NULL) {
            xmlCharEncodingHandlerPtr handler;

            if (ctxt->input->encoding != NULL)
                xmlFree((xmlChar *) ctxt->input->encoding);
            ctxt->input->encoding = encoding;

            handler = xmlFindCharEncodingHandler((const char *) encoding);
            if (handler != NULL) {
                if (xmlSwitchToEncoding(ctxt, handler) < 0) {
                    /* failed to convert */
                    ctxt->errNo = XML_ERR_UNSUPPORTED_ENCODING;
                    return(NULL);
                }
            } else {
                xmlFatalErrMsgStr(ctxt, XML_ERR_UNSUPPORTED_ENCODING,
                        "Unsupported encoding %s\n", encoding);
                return(NULL);
            }
        }
    }
    return(encoding);
}

/**
 * xmlParseSDDecl:
 * @ctxt:  an XML parser context
 *
 * parse the XML standalone declaration
 *
 * [32] SDDecl ::= S 'standalone' Eq
 *                 (("'" ('yes' | 'no') "'") | ('"' ('yes' | 'no')'"'))
 *
 * [ VC: Standalone Document Declaration ]
 * TODO The standalone document declaration must have the value "no"
 * if any external markup declarations contain declarations of:
 *  - attributes with default values, if elements to which these
 *    attributes apply appear in the document without specifications
 *    of values for these attributes, or
 *  - entities (other than amp, lt, gt, apos, quot), if references
 *    to those entities appear in the document, or
 *  - attributes with values subject to normalization, where the
 *    attribute appears in the document with a value which will change
 *    as a result of normalization, or
 *  - element types with element content, if white space occurs directly
 *    within any instance of those types.
 *
 * Returns:
 *   1 if standalone="yes"
 *   0 if standalone="no"
 *  -2 if standalone attribute is missing or invalid
 *        (A standalone value of -2 means that the XML declaration was found,
 *         but no value was specified for the standalone attribute).
 */

int
xmlParseSDDecl(xmlParserCtxtPtr ctxt) {
    int standalone = -2;

    SKIP_BLANKS;
    if (CMP10(CUR_PTR, 's', 't', 'a', 'n', 'd', 'a', 'l', 'o', 'n', 'e')) {
        SKIP(10);
        SKIP_BLANKS;
        if (RAW != '=') {
            xmlFatalErr(ctxt, XML_ERR_EQUAL_REQUIRED, NULL);
            return(standalone);
        }
        NEXT;
        SKIP_BLANKS;
        if (RAW == '\''){
            NEXT;
            if ((RAW == 'n') && (NXT(1) == 'o')) {
                standalone = 0;
                SKIP(2);
            } else if ((RAW == 'y') && (NXT(1) == 'e') &&
                       (NXT(2) == 's')) {
                standalone = 1;
                SKIP(3);
            } else {
                xmlFatalErr(ctxt, XML_ERR_STANDALONE_VALUE, NULL);
            }
            if (RAW != '\'') {
                xmlFatalErr(ctxt, XML_ERR_STRING_NOT_CLOSED, NULL);
            } else
                NEXT;
        } else if (RAW == '"'){
            NEXT;
            if ((RAW == 'n') && (NXT(1) == 'o')) {
                standalone = 0;
                SKIP(2);
            } else if ((RAW == 'y') && (NXT(1) == 'e') &&
                       (NXT(2) == 's')) {
                standalone = 1;
                SKIP(3);
            } else {
                xmlFatalErr(ctxt, XML_ERR_STANDALONE_VALUE, NULL);
            }
            if (RAW != '"') {
                xmlFatalErr(ctxt, XML_ERR_STRING_NOT_CLOSED, NULL);
            } else
                NEXT;
        } else {
            xmlFatalErr(ctxt, XML_ERR_STRING_NOT_STARTED, NULL);
        }
    }
    return(standalone);
}

/**
 * xmlParseXMLDecl:
 * @ctxt:  an XML parser context
 *
 * parse an XML declaration header
 *
 * [23] XMLDecl ::= '<?xml' VersionInfo EncodingDecl? SDDecl? S? '?>'
 */

void
xmlParseXMLDecl(xmlParserCtxtPtr ctxt) {
    xmlChar *version;

    /*
     * This value for standalone indicates that the document has an
     * XML declaration but it does not have a standalone attribute.
     * It will be overwritten later if a standalone attribute is found.
     */
    ctxt->input->standalone = -2;

    /*
     * We know that '<?xml' is here.
     */
    SKIP(5);

    if (!IS_BLANK_CH(RAW)) {
        xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED,
                       "Blank needed after '<?xml'\n");
    }
    SKIP_BLANKS;

    /*
     * We must have the VersionInfo here.
     */
    version = xmlParseVersionInfo(ctxt);
    if (version == NULL) {
        xmlFatalErr(ctxt, XML_ERR_VERSION_MISSING, NULL);
    } else {
        if (!xmlStrEqual(version, (const xmlChar *) XML_DEFAULT_VERSION)) {
            /*
             * Changed here for XML-1.0 5th edition
             */
            if (ctxt->options & XML_PARSE_OLD10) {
                xmlFatalErrMsgStr(ctxt, XML_ERR_UNKNOWN_VERSION,
                                  "Unsupported version '%s'\n",
                                  version);
            } else {
                if ((version[0] == '1') && ((version[1] == '.'))) {
                    xmlWarningMsg(ctxt, XML_WAR_UNKNOWN_VERSION,
                                  "Unsupported version '%s'\n",
                                  version, NULL);
                } else {
                    xmlFatalErrMsgStr(ctxt, XML_ERR_UNKNOWN_VERSION,
                                      "Unsupported version '%s'\n",
                                      version);
                }
            }
        }
        if (ctxt->version != NULL)
            xmlFree((void *) ctxt->version);
        ctxt->version = version;
    }

    /*
     * We may have the encoding declaration
     */
    if (!IS_BLANK_CH(RAW)) {
        if ((RAW == '?') && (NXT(1) == '>')) {
            SKIP(2);
            return;
        }
        xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED, "Blank needed here\n");
    }
    xmlParseEncodingDecl(ctxt);
    if ((ctxt->errNo == XML_ERR_UNSUPPORTED_ENCODING) ||
         (ctxt->instate == XML_PARSER_EOF)) {
        /*
         * The XML REC instructs us to stop parsing right here
         */
        return;
    }

    /*
     * We may have the standalone status.
     */
    if ((ctxt->input->encoding != NULL) && (!IS_BLANK_CH(RAW))) {
        if ((RAW == '?') && (NXT(1) == '>')) {
            SKIP(2);
            return;
        }
        xmlFatalErrMsg(ctxt, XML_ERR_SPACE_REQUIRED, "Blank needed here\n");
    }

    /*
     * We can grow the input buffer freely at that point
     */
    GROW;

    SKIP_BLANKS;
    ctxt->input->standalone = xmlParseSDDecl(ctxt);

    SKIP_BLANKS;
    if ((RAW == '?') && (NXT(1) == '>')) {
        SKIP(2);
    } else if (RAW == '>') {
        /* Deprecated old WD ... */
        xmlFatalErr(ctxt, XML_ERR_XMLDECL_NOT_FINISHED, NULL);
        NEXT;
    } else {
        xmlFatalErr(ctxt, XML_ERR_XMLDECL_NOT_FINISHED, NULL);
        MOVETO_ENDTAG(CUR_PTR);
        NEXT;
    }
}

/**
 * xmlParseMisc:
 * @ctxt:  an XML parser context
 *
 * parse an XML Misc* optional field.
 *
 * [27] Misc ::= Comment | PI |  S
 */

void
xmlParseMisc(xmlParserCtxtPtr ctxt) {
    while (ctxt->instate != XML_PARSER_EOF) {
        SKIP_BLANKS;
        GROW;
        if ((RAW == '<') && (NXT(1) == '?')) {
            xmlParsePI(ctxt);
        } else if (CMP4(CUR_PTR, '<', '!', '-', '-')) {
            xmlParseComment(ctxt);
        } else {
            break;
        }
    }
}

/**
 * xmlParseDocument:
 * @ctxt:  an XML parser context
 *
 * parse an XML document (and build a tree if using the standard SAX
 * interface).
 *
 * [1] document ::= prolog element Misc*
 *
 * [22] prolog ::= XMLDecl? Misc* (doctypedecl Misc*)?
 *
 * Returns 0, -1 in case of error. the parser context is augmented
 *                as a result of the parsing.
 */

int
xmlParseDocument(xmlParserCtxtPtr ctxt) {
    xmlChar start[4];
    xmlCharEncoding enc;

    xmlInitParser();

    if ((ctxt == NULL) || (ctxt->input == NULL))
        return(-1);

    GROW;

    /*
     * SAX: detecting the level.
     */
    xmlDetectSAX2(ctxt);

    /*
     * SAX: beginning of the document processing.
     */
    if ((ctxt->sax) && (ctxt->sax->setDocumentLocator))
        ctxt->sax->setDocumentLocator(ctxt->userData, &xmlDefaultSAXLocator);
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);

    if ((ctxt->encoding == NULL) &&
        ((ctxt->input->end - ctxt->input->cur) >= 4)) {
        /*
         * Get the 4 first bytes and decode the charset
         * if enc != XML_CHAR_ENCODING_NONE
         * plug some encoding conversion routines.
         */
        start[0] = RAW;
        start[1] = NXT(1);
        start[2] = NXT(2);
        start[3] = NXT(3);
        enc = xmlDetectCharEncoding(&start[0], 4);
        if (enc != XML_CHAR_ENCODING_NONE) {
            xmlSwitchEncoding(ctxt, enc);
        }
    }


    if (CUR == 0) {
        xmlFatalErr(ctxt, XML_ERR_DOCUMENT_EMPTY, NULL);
        return(-1);
    }

    /*
     * Check for the XMLDecl in the Prolog.
     * do not GROW here to avoid the detected encoder to decode more
     * than just the first line, unless the amount of data is really
     * too small to hold "<?xml version="1.0" encoding="foo"
     */
    if ((ctxt->input->end - ctxt->input->cur) < 35) {
       GROW;
    }
    if ((CMP5(CUR_PTR, '<', '?', 'x', 'm', 'l')) && (IS_BLANK_CH(NXT(5)))) {

        /*
         * Note that we will switch encoding on the fly.
         */
        xmlParseXMLDecl(ctxt);
        if ((ctxt->errNo == XML_ERR_UNSUPPORTED_ENCODING) ||
            (ctxt->instate == XML_PARSER_EOF)) {
            /*
             * The XML REC instructs us to stop parsing right here
             */
            return(-1);
        }
        ctxt->standalone = ctxt->input->standalone;
        SKIP_BLANKS;
    } else {
        ctxt->version = xmlCharStrdup(XML_DEFAULT_VERSION);
    }
    if ((ctxt->sax) && (ctxt->sax->startDocument) && (!ctxt->disableSAX))
        ctxt->sax->startDocument(ctxt->userData);
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);
    if ((ctxt->myDoc != NULL) && (ctxt->input != NULL) &&
        (ctxt->input->buf != NULL) && (ctxt->input->buf->compressed >= 0)) {
        ctxt->myDoc->compression = ctxt->input->buf->compressed;
    }

    /*
     * The Misc part of the Prolog
     */
    xmlParseMisc(ctxt);

    /*
     * Then possibly doc type declaration(s) and more Misc
     * (doctypedecl Misc*)?
     */
    GROW;
    if (CMP9(CUR_PTR, '<', '!', 'D', 'O', 'C', 'T', 'Y', 'P', 'E')) {

        ctxt->inSubset = 1;
        xmlParseDocTypeDecl(ctxt);
        if (RAW == '[') {
            ctxt->instate = XML_PARSER_DTD;
            xmlParseInternalSubset(ctxt);
            if (ctxt->instate == XML_PARSER_EOF)
                return(-1);
        }

        /*
         * Create and update the external subset.
         */
        ctxt->inSubset = 2;
        if ((ctxt->sax != NULL) && (ctxt->sax->externalSubset != NULL) &&
            (!ctxt->disableSAX))
            ctxt->sax->externalSubset(ctxt->userData, ctxt->intSubName,
                                      ctxt->extSubSystem, ctxt->extSubURI);
        if (ctxt->instate == XML_PARSER_EOF)
            return(-1);
        ctxt->inSubset = 0;

        xmlCleanSpecialAttr(ctxt);

        ctxt->instate = XML_PARSER_PROLOG;
        xmlParseMisc(ctxt);
    }

    /*
     * Time to start parsing the tree itself
     */
    GROW;
    if (RAW != '<') {
        xmlFatalErrMsg(ctxt, XML_ERR_DOCUMENT_EMPTY,
                       "Start tag expected, '<' not found\n");
    } else {
        ctxt->instate = XML_PARSER_CONTENT;
        xmlParseElement(ctxt);
        ctxt->instate = XML_PARSER_EPILOG;


        /*
         * The Misc part at the end
         */
        xmlParseMisc(ctxt);

        if (RAW != 0) {
            xmlFatalErr(ctxt, XML_ERR_DOCUMENT_END, NULL);
        }
        ctxt->instate = XML_PARSER_EOF;
    }

    /*
     * SAX: end of the document processing.
     */
    if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
        ctxt->sax->endDocument(ctxt->userData);

    /*
     * Remove locally kept entity definitions if the tree was not built
     */
    if ((ctxt->myDoc != NULL) &&
        (xmlStrEqual(ctxt->myDoc->version, SAX_COMPAT_MODE))) {
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }

    if ((ctxt->wellFormed) && (ctxt->myDoc != NULL)) {
        ctxt->myDoc->properties |= XML_DOC_WELLFORMED;
        if (ctxt->valid)
            ctxt->myDoc->properties |= XML_DOC_DTDVALID;
        if (ctxt->nsWellFormed)
            ctxt->myDoc->properties |= XML_DOC_NSVALID;
        if (ctxt->options & XML_PARSE_OLD10)
            ctxt->myDoc->properties |= XML_DOC_OLD10;
    }
    if (! ctxt->wellFormed) {
        ctxt->valid = 0;
        return(-1);
    }
    return(0);
}

/**
 * xmlParseExtParsedEnt:
 * @ctxt:  an XML parser context
 *
 * parse a general parsed entity
 * An external general parsed entity is well-formed if it matches the
 * production labeled extParsedEnt.
 *
 * [78] extParsedEnt ::= TextDecl? content
 *
 * Returns 0, -1 in case of error. the parser context is augmented
 *                as a result of the parsing.
 */

int
xmlParseExtParsedEnt(xmlParserCtxtPtr ctxt) {
    xmlChar start[4];
    xmlCharEncoding enc;

    if ((ctxt == NULL) || (ctxt->input == NULL))
        return(-1);

    xmlDetectSAX2(ctxt);

    GROW;

    /*
     * SAX: beginning of the document processing.
     */
    if ((ctxt->sax) && (ctxt->sax->setDocumentLocator))
        ctxt->sax->setDocumentLocator(ctxt->userData, &xmlDefaultSAXLocator);

    /*
     * Get the 4 first bytes and decode the charset
     * if enc != XML_CHAR_ENCODING_NONE
     * plug some encoding conversion routines.
     */
    if ((ctxt->input->end - ctxt->input->cur) >= 4) {
        start[0] = RAW;
        start[1] = NXT(1);
        start[2] = NXT(2);
        start[3] = NXT(3);
        enc = xmlDetectCharEncoding(start, 4);
        if (enc != XML_CHAR_ENCODING_NONE) {
            xmlSwitchEncoding(ctxt, enc);
        }
    }


    if (CUR == 0) {
        xmlFatalErr(ctxt, XML_ERR_DOCUMENT_EMPTY, NULL);
    }

    /*
     * Check for the XMLDecl in the Prolog.
     */
    GROW;
    if ((CMP5(CUR_PTR, '<', '?', 'x', 'm', 'l')) && (IS_BLANK_CH(NXT(5)))) {

        /*
         * Note that we will switch encoding on the fly.
         */
        xmlParseXMLDecl(ctxt);
        if (ctxt->errNo == XML_ERR_UNSUPPORTED_ENCODING) {
            /*
             * The XML REC instructs us to stop parsing right here
             */
            return(-1);
        }
        SKIP_BLANKS;
    } else {
        ctxt->version = xmlCharStrdup(XML_DEFAULT_VERSION);
    }
    if ((ctxt->sax) && (ctxt->sax->startDocument) && (!ctxt->disableSAX))
        ctxt->sax->startDocument(ctxt->userData);
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);

    /*
     * Doing validity checking on chunk doesn't make sense
     */
    ctxt->instate = XML_PARSER_CONTENT;
    ctxt->validate = 0;
    ctxt->loadsubset = 0;
    ctxt->depth = 0;

    xmlParseContent(ctxt);
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);

    if ((RAW == '<') && (NXT(1) == '/')) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    } else if (RAW != 0) {
        xmlFatalErr(ctxt, XML_ERR_EXTRA_CONTENT, NULL);
    }

    /*
     * SAX: end of the document processing.
     */
    if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
        ctxt->sax->endDocument(ctxt->userData);

    if (! ctxt->wellFormed) return(-1);
    return(0);
}

#ifdef LIBXML_PUSH_ENABLED
/************************************************************************
 *                                                                      *
 *              Progressive parsing interfaces                          *
 *                                                                      *
 ************************************************************************/

/**
 * xmlParseLookupSequence:
 * @ctxt:  an XML parser context
 * @first:  the first char to lookup
 * @next:  the next char to lookup or zero
 * @third:  the next char to lookup or zero
 *
 * Try to find if a sequence (first, next, third) or  just (first next) or
 * (first) is available in the input stream.
 * This function has a side effect of (possibly) incrementing ctxt->checkIndex
 * to avoid rescanning sequences of bytes, it DOES change the state of the
 * parser, do not use liberally.
 *
 * Returns the index to the current parsing point if the full sequence
 *      is available, -1 otherwise.
 */
static int
xmlParseLookupSequence(xmlParserCtxtPtr ctxt, xmlChar first,
                       xmlChar next, xmlChar third) {
    int base, len;
    xmlParserInputPtr in;
    const xmlChar *buf;

    in = ctxt->input;
    if (in == NULL) return(-1);
    base = in->cur - in->base;
    if (base < 0) return(-1);
    if (ctxt->checkIndex > base)
        base = ctxt->checkIndex;
    if (in->buf == NULL) {
        buf = in->base;
        len = in->length;
    } else {
        buf = xmlBufContent(in->buf->buffer);
        len = xmlBufUse(in->buf->buffer);
    }
    /* take into account the sequence length */
    if (third) len -= 2;
    else if (next) len --;
    for (;base < len;base++) {
        if (buf[base] == first) {
            if (third != 0) {
                if ((buf[base + 1] != next) ||
                    (buf[base + 2] != third)) continue;
            } else if (next != 0) {
                if (buf[base + 1] != next) continue;
            }
            ctxt->checkIndex = 0;
#ifdef DEBUG_PUSH
            if (next == 0)
                xmlGenericError(xmlGenericErrorContext,
                        "PP: lookup '%c' found at %d\n",
                        first, base);
            else if (third == 0)
                xmlGenericError(xmlGenericErrorContext,
                        "PP: lookup '%c%c' found at %d\n",
                        first, next, base);
            else
                xmlGenericError(xmlGenericErrorContext,
                        "PP: lookup '%c%c%c' found at %d\n",
                        first, next, third, base);
#endif
            return(base - (in->cur - in->base));
        }
    }
    ctxt->checkIndex = base;
#ifdef DEBUG_PUSH
    if (next == 0)
        xmlGenericError(xmlGenericErrorContext,
                "PP: lookup '%c' failed\n", first);
    else if (third == 0)
        xmlGenericError(xmlGenericErrorContext,
                "PP: lookup '%c%c' failed\n", first, next);
    else
        xmlGenericError(xmlGenericErrorContext,
                "PP: lookup '%c%c%c' failed\n", first, next, third);
#endif
    return(-1);
}

/**
 * xmlParseGetLasts:
 * @ctxt:  an XML parser context
 * @lastlt:  pointer to store the last '<' from the input
 * @lastgt:  pointer to store the last '>' from the input
 *
 * Lookup the last < and > in the current chunk
 */
static void
xmlParseGetLasts(xmlParserCtxtPtr ctxt, const xmlChar **lastlt,
                 const xmlChar **lastgt) {
    const xmlChar *tmp;

    if ((ctxt == NULL) || (lastlt == NULL) || (lastgt == NULL)) {
        xmlGenericError(xmlGenericErrorContext,
                    "Internal error: xmlParseGetLasts\n");
        return;
    }
    if ((ctxt->progressive != 0) && (ctxt->inputNr == 1)) {
        tmp = ctxt->input->end;
        tmp--;
        while ((tmp >= ctxt->input->base) && (*tmp != '<')) tmp--;
        if (tmp < ctxt->input->base) {
            *lastlt = NULL;
            *lastgt = NULL;
        } else {
            *lastlt = tmp;
            tmp++;
            while ((tmp < ctxt->input->end) && (*tmp != '>')) {
                if (*tmp == '\'') {
                    tmp++;
                    while ((tmp < ctxt->input->end) && (*tmp != '\'')) tmp++;
                    if (tmp < ctxt->input->end) tmp++;
                } else if (*tmp == '"') {
                    tmp++;
                    while ((tmp < ctxt->input->end) && (*tmp != '"')) tmp++;
                    if (tmp < ctxt->input->end) tmp++;
                } else
                    tmp++;
            }
            if (tmp < ctxt->input->end)
                *lastgt = tmp;
            else {
                tmp = *lastlt;
                tmp--;
                while ((tmp >= ctxt->input->base) && (*tmp != '>')) tmp--;
                if (tmp >= ctxt->input->base)
                    *lastgt = tmp;
                else
                    *lastgt = NULL;
            }
        }
    } else {
        *lastlt = NULL;
        *lastgt = NULL;
    }
}
/**
 * xmlCheckCdataPush:
 * @cur: pointer to the block of characters
 * @len: length of the block in bytes
 * @complete: 1 if complete CDATA block is passed in, 0 if partial block
 *
 * Check that the block of characters is okay as SCdata content [20]
 *
 * Returns the number of bytes to pass if okay, a negative index where an
 *         UTF-8 error occurred otherwise
 */
static int
xmlCheckCdataPush(const xmlChar *utf, int len, int complete) {
    int ix;
    unsigned char c;
    int codepoint;

    if ((utf == NULL) || (len <= 0))
        return(0);

    for (ix = 0; ix < len;) {      /* string is 0-terminated */
        c = utf[ix];
        if ((c & 0x80) == 0x00) {       /* 1-byte code, starts with 10 */
            if (c >= 0x20)
                ix++;
            else if ((c == 0xA) || (c == 0xD) || (c == 0x9))
                ix++;
            else
                return(-ix);
        } else if ((c & 0xe0) == 0xc0) {/* 2-byte code, starts with 110 */
            if (ix + 2 > len) return(complete ? -ix : ix);
            if ((utf[ix+1] & 0xc0 ) != 0x80)
                return(-ix);
            codepoint = (utf[ix] & 0x1f) << 6;
            codepoint |= utf[ix+1] & 0x3f;
            if (!xmlIsCharQ(codepoint))
                return(-ix);
            ix += 2;
        } else if ((c & 0xf0) == 0xe0) {/* 3-byte code, starts with 1110 */
            if (ix + 3 > len) return(complete ? -ix : ix);
            if (((utf[ix+1] & 0xc0) != 0x80) ||
                ((utf[ix+2] & 0xc0) != 0x80))
                    return(-ix);
            codepoint = (utf[ix] & 0xf) << 12;
            codepoint |= (utf[ix+1] & 0x3f) << 6;
            codepoint |= utf[ix+2] & 0x3f;
            if (!xmlIsCharQ(codepoint))
                return(-ix);
            ix += 3;
        } else if ((c & 0xf8) == 0xf0) {/* 4-byte code, starts with 11110 */
            if (ix + 4 > len) return(complete ? -ix : ix);
            if (((utf[ix+1] & 0xc0) != 0x80) ||
                ((utf[ix+2] & 0xc0) != 0x80) ||
                ((utf[ix+3] & 0xc0) != 0x80))
                    return(-ix);
            codepoint = (utf[ix] & 0x7) << 18;
            codepoint |= (utf[ix+1] & 0x3f) << 12;
            codepoint |= (utf[ix+2] & 0x3f) << 6;
            codepoint |= utf[ix+3] & 0x3f;
            if (!xmlIsCharQ(codepoint))
                return(-ix);
            ix += 4;
        } else                          /* unknown encoding */
            return(-ix);
      }
      return(ix);
}

/**
 * xmlParseTryOrFinish:
 * @ctxt:  an XML parser context
 * @terminate:  last chunk indicator
 *
 * Try to progress on parsing
 *
 * Returns zero if no parsing was possible
 */
static int
xmlParseTryOrFinish(xmlParserCtxtPtr ctxt, int terminate) {
    int ret = 0;
    int avail, tlen;
    xmlChar cur, next;
    const xmlChar *lastlt, *lastgt;

    if (ctxt->input == NULL)
        return(0);

#ifdef DEBUG_PUSH
    switch (ctxt->instate) {
        case XML_PARSER_EOF:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try EOF\n"); break;
        case XML_PARSER_START:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try START\n"); break;
        case XML_PARSER_MISC:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try MISC\n");break;
        case XML_PARSER_COMMENT:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try COMMENT\n");break;
        case XML_PARSER_PROLOG:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try PROLOG\n");break;
        case XML_PARSER_START_TAG:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try START_TAG\n");break;
        case XML_PARSER_CONTENT:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try CONTENT\n");break;
        case XML_PARSER_CDATA_SECTION:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try CDATA_SECTION\n");break;
        case XML_PARSER_END_TAG:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try END_TAG\n");break;
        case XML_PARSER_ENTITY_DECL:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try ENTITY_DECL\n");break;
        case XML_PARSER_ENTITY_VALUE:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try ENTITY_VALUE\n");break;
        case XML_PARSER_ATTRIBUTE_VALUE:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try ATTRIBUTE_VALUE\n");break;
        case XML_PARSER_DTD:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try DTD\n");break;
        case XML_PARSER_EPILOG:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try EPILOG\n");break;
        case XML_PARSER_PI:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try PI\n");break;
        case XML_PARSER_IGNORE:
            xmlGenericError(xmlGenericErrorContext,
                    "PP: try IGNORE\n");break;
    }
#endif

    if ((ctxt->input != NULL) &&
        (ctxt->input->cur - ctxt->input->base > 4096)) {
        xmlSHRINK(ctxt);
        ctxt->checkIndex = 0;
    }
    xmlParseGetLasts(ctxt, &lastlt, &lastgt);

    while (ctxt->instate != XML_PARSER_EOF) {
        if ((ctxt->errNo != XML_ERR_OK) && (ctxt->disableSAX == 1))
            return(0);

        if (ctxt->input == NULL) break;
        if (ctxt->input->buf == NULL)
            avail = ctxt->input->length -
                    (ctxt->input->cur - ctxt->input->base);
        else {
            /*
             * If we are operating on converted input, try to flush
             * remaining chars to avoid them stalling in the non-converted
             * buffer. But do not do this in document start where
             * encoding="..." may not have been read and we work on a
             * guessed encoding.
             */
            if ((ctxt->instate != XML_PARSER_START) &&
                (ctxt->input->buf->raw != NULL) &&
                (xmlBufIsEmpty(ctxt->input->buf->raw) == 0)) {
                size_t base = xmlBufGetInputBase(ctxt->input->buf->buffer,
                                                 ctxt->input);
                size_t current = ctxt->input->cur - ctxt->input->base;

                xmlParserInputBufferPush(ctxt->input->buf, 0, "");
                xmlBufSetInputBaseCur(ctxt->input->buf->buffer, ctxt->input,
                                      base, current);
            }
            avail = xmlBufUse(ctxt->input->buf->buffer) -
                    (ctxt->input->cur - ctxt->input->base);
        }
        if (avail < 1)
            goto done;
        switch (ctxt->instate) {
            case XML_PARSER_EOF:
                /*
                 * Document parsing is done !
                 */
                goto done;
            case XML_PARSER_START:
                if (ctxt->charset == XML_CHAR_ENCODING_NONE) {
                    xmlChar start[4];
                    xmlCharEncoding enc;

                    /*
                     * Very first chars read from the document flow.
                     */
                    if (avail < 4)
                        goto done;

                    /*
                     * Get the 4 first bytes and decode the charset
                     * if enc != XML_CHAR_ENCODING_NONE
                     * plug some encoding conversion routines,
                     * else xmlSwitchEncoding will set to (default)
                     * UTF8.
                     */
                    start[0] = RAW;
                    start[1] = NXT(1);
                    start[2] = NXT(2);
                    start[3] = NXT(3);
                    enc = xmlDetectCharEncoding(start, 4);
                    xmlSwitchEncoding(ctxt, enc);
                    break;
                }

                if (avail < 2)
                    goto done;
                cur = ctxt->input->cur[0];
                next = ctxt->input->cur[1];
                if (cur == 0) {
                    if ((ctxt->sax) && (ctxt->sax->setDocumentLocator))
                        ctxt->sax->setDocumentLocator(ctxt->userData,
                                                      &xmlDefaultSAXLocator);
                    xmlFatalErr(ctxt, XML_ERR_DOCUMENT_EMPTY, NULL);
                    xmlHaltParser(ctxt);
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: entering EOF\n");
#endif
                    if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
                        ctxt->sax->endDocument(ctxt->userData);
                    goto done;
                }
                if ((cur == '<') && (next == '?')) {
                    /* PI or XML decl */
                    if (avail < 5) return(ret);
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '?', '>', 0) < 0))
                        return(ret);
                    if ((ctxt->sax) && (ctxt->sax->setDocumentLocator))
                        ctxt->sax->setDocumentLocator(ctxt->userData,
                                                      &xmlDefaultSAXLocator);
                    if ((ctxt->input->cur[2] == 'x') &&
                        (ctxt->input->cur[3] == 'm') &&
                        (ctxt->input->cur[4] == 'l') &&
                        (IS_BLANK_CH(ctxt->input->cur[5]))) {
                        ret += 5;
#ifdef DEBUG_PUSH
                        xmlGenericError(xmlGenericErrorContext,
                                "PP: Parsing XML Decl\n");
#endif
                        xmlParseXMLDecl(ctxt);
                        if (ctxt->errNo == XML_ERR_UNSUPPORTED_ENCODING) {
                            /*
                             * The XML REC instructs us to stop parsing right
                             * here
                             */
                            xmlHaltParser(ctxt);
                            return(0);
                        }
                        ctxt->standalone = ctxt->input->standalone;
                        if ((ctxt->encoding == NULL) &&
                            (ctxt->input->encoding != NULL))
                            ctxt->encoding = xmlStrdup(ctxt->input->encoding);
                        if ((ctxt->sax) && (ctxt->sax->startDocument) &&
                            (!ctxt->disableSAX))
                            ctxt->sax->startDocument(ctxt->userData);
                        ctxt->instate = XML_PARSER_MISC;
#ifdef DEBUG_PUSH
                        xmlGenericError(xmlGenericErrorContext,
                                "PP: entering MISC\n");
#endif
                    } else {
                        ctxt->version = xmlCharStrdup(XML_DEFAULT_VERSION);
                        if ((ctxt->sax) && (ctxt->sax->startDocument) &&
                            (!ctxt->disableSAX))
                            ctxt->sax->startDocument(ctxt->userData);
                        ctxt->instate = XML_PARSER_MISC;
#ifdef DEBUG_PUSH
                        xmlGenericError(xmlGenericErrorContext,
                                "PP: entering MISC\n");
#endif
                    }
                } else {
                    if ((ctxt->sax) && (ctxt->sax->setDocumentLocator))
                        ctxt->sax->setDocumentLocator(ctxt->userData,
                                                      &xmlDefaultSAXLocator);
                    ctxt->version = xmlCharStrdup(XML_DEFAULT_VERSION);
                    if (ctxt->version == NULL) {
                        xmlErrMemory(ctxt, NULL);
                        break;
                    }
                    if ((ctxt->sax) && (ctxt->sax->startDocument) &&
                        (!ctxt->disableSAX))
                        ctxt->sax->startDocument(ctxt->userData);
                    ctxt->instate = XML_PARSER_MISC;
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: entering MISC\n");
#endif
                }
                break;
            case XML_PARSER_START_TAG: {
                const xmlChar *name;
                const xmlChar *prefix = NULL;
                const xmlChar *URI = NULL;
                int line = ctxt->input->line;
                int nsNr = ctxt->nsNr;

                if ((avail < 2) && (ctxt->inputNr == 1))
                    goto done;
                cur = ctxt->input->cur[0];
                if (cur != '<') {
                    xmlFatalErr(ctxt, XML_ERR_DOCUMENT_EMPTY, NULL);
                    xmlHaltParser(ctxt);
                    if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
                        ctxt->sax->endDocument(ctxt->userData);
                    goto done;
                }
                if (!terminate) {
                    if (ctxt->progressive) {
                        /* > can be found unescaped in attribute values */
                        if ((lastgt == NULL) || (ctxt->input->cur >= lastgt))
                            goto done;
                    } else if (xmlParseLookupSequence(ctxt, '>', 0, 0) < 0) {
                        goto done;
                    }
                }
                if (ctxt->spaceNr == 0)
                    spacePush(ctxt, -1);
                else if (*ctxt->space == -2)
                    spacePush(ctxt, -1);
                else
                    spacePush(ctxt, *ctxt->space);
#ifdef LIBXML_SAX1_ENABLED
                if (ctxt->sax2)
#endif /* LIBXML_SAX1_ENABLED */
                    name = xmlParseStartTag2(ctxt, &prefix, &URI, &tlen);
#ifdef LIBXML_SAX1_ENABLED
                else
                    name = xmlParseStartTag(ctxt);
#endif /* LIBXML_SAX1_ENABLED */
                if (ctxt->instate == XML_PARSER_EOF)
                    goto done;
                if (name == NULL) {
                    spacePop(ctxt);
                    xmlHaltParser(ctxt);
                    if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
                        ctxt->sax->endDocument(ctxt->userData);
                    goto done;
                }
#ifdef LIBXML_VALID_ENABLED
                /*
                 * [ VC: Root Element Type ]
                 * The Name in the document type declaration must match
                 * the element type of the root element.
                 */
                if (ctxt->validate && ctxt->wellFormed && ctxt->myDoc &&
                    ctxt->node && (ctxt->node == ctxt->myDoc->children))
                    ctxt->valid &= xmlValidateRoot(&ctxt->vctxt, ctxt->myDoc);
#endif /* LIBXML_VALID_ENABLED */

                /*
                 * Check for an Empty Element.
                 */
                if ((RAW == '/') && (NXT(1) == '>')) {
                    SKIP(2);

                    if (ctxt->sax2) {
                        if ((ctxt->sax != NULL) &&
                            (ctxt->sax->endElementNs != NULL) &&
                            (!ctxt->disableSAX))
                            ctxt->sax->endElementNs(ctxt->userData, name,
                                                    prefix, URI);
                        if (ctxt->nsNr - nsNr > 0)
                            nsPop(ctxt, ctxt->nsNr - nsNr);
#ifdef LIBXML_SAX1_ENABLED
                    } else {
                        if ((ctxt->sax != NULL) &&
                            (ctxt->sax->endElement != NULL) &&
                            (!ctxt->disableSAX))
                            ctxt->sax->endElement(ctxt->userData, name);
#endif /* LIBXML_SAX1_ENABLED */
                    }
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    spacePop(ctxt);
                    if (ctxt->nameNr == 0) {
                        ctxt->instate = XML_PARSER_EPILOG;
                    } else {
                        ctxt->instate = XML_PARSER_CONTENT;
                    }
                    ctxt->progressive = 1;
                    break;
                }
                if (RAW == '>') {
                    NEXT;
                } else {
                    xmlFatalErrMsgStr(ctxt, XML_ERR_GT_REQUIRED,
                                         "Couldn't find end of Start Tag %s\n",
                                         name);
                    nodePop(ctxt);
                    spacePop(ctxt);
                }
                nameNsPush(ctxt, name, prefix, URI, line, ctxt->nsNr - nsNr);

                ctxt->instate = XML_PARSER_CONTENT;
                ctxt->progressive = 1;
                break;
            }
            case XML_PARSER_CONTENT: {
                int id;
                unsigned long cons;
                if ((avail < 2) && (ctxt->inputNr == 1))
                    goto done;
                cur = ctxt->input->cur[0];
                next = ctxt->input->cur[1];

                id = ctxt->input->id;
                cons = CUR_CONSUMED;
                if ((cur == '<') && (next == '/')) {
                    ctxt->instate = XML_PARSER_END_TAG;
                    break;
                } else if ((cur == '<') && (next == '?')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '?', '>', 0) < 0)) {
                        ctxt->progressive = XML_PARSER_PI;
                        goto done;
                    }
                    xmlParsePI(ctxt);
                    ctxt->instate = XML_PARSER_CONTENT;
                    ctxt->progressive = 1;
                } else if ((cur == '<') && (next != '!')) {
                    ctxt->instate = XML_PARSER_START_TAG;
                    break;
                } else if ((cur == '<') && (next == '!') &&
                           (ctxt->input->cur[2] == '-') &&
                           (ctxt->input->cur[3] == '-')) {
                    int term;

                    if (avail < 4)
                        goto done;
                    ctxt->input->cur += 4;
                    term = xmlParseLookupSequence(ctxt, '-', '-', '>');
                    ctxt->input->cur -= 4;
                    if ((!terminate) && (term < 0)) {
                        ctxt->progressive = XML_PARSER_COMMENT;
                        goto done;
                    }
                    xmlParseComment(ctxt);
                    ctxt->instate = XML_PARSER_CONTENT;
                    ctxt->progressive = 1;
                } else if ((cur == '<') && (ctxt->input->cur[1] == '!') &&
                    (ctxt->input->cur[2] == '[') &&
                    (ctxt->input->cur[3] == 'C') &&
                    (ctxt->input->cur[4] == 'D') &&
                    (ctxt->input->cur[5] == 'A') &&
                    (ctxt->input->cur[6] == 'T') &&
                    (ctxt->input->cur[7] == 'A') &&
                    (ctxt->input->cur[8] == '[')) {
                    SKIP(9);
                    ctxt->instate = XML_PARSER_CDATA_SECTION;
                    break;
                } else if ((cur == '<') && (next == '!') &&
                           (avail < 9)) {
                    goto done;
                } else if (cur == '&') {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, ';', 0, 0) < 0))
                        goto done;
                    xmlParseReference(ctxt);
                } else {
                    /* TODO Avoid the extra copy, handle directly !!! */
                    /*
                     * Goal of the following test is:
                     *  - minimize calls to the SAX 'character' callback
                     *    when they are mergeable
                     *  - handle an problem for isBlank when we only parse
                     *    a sequence of blank chars and the next one is
                     *    not available to check against '<' presence.
                     *  - tries to homogenize the differences in SAX
                     *    callbacks between the push and pull versions
                     *    of the parser.
                     */
                    if ((ctxt->inputNr == 1) &&
                        (avail < XML_PARSER_BIG_BUFFER_SIZE)) {
                        if (!terminate) {
                            if (ctxt->progressive) {
                                if ((lastlt == NULL) ||
                                    (ctxt->input->cur > lastlt))
                                    goto done;
                            } else if (xmlParseLookupSequence(ctxt,
                                                              '<', 0, 0) < 0) {
                                goto done;
                            }
                        }
                    }
                    ctxt->checkIndex = 0;
                    xmlParseCharData(ctxt, 0);
                }
                if ((cons == CUR_CONSUMED) && (id == ctxt->input->id)) {
                    xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR,
                                "detected an error in element content\n");
                    xmlHaltParser(ctxt);
                    break;
                }
                break;
            }
            case XML_PARSER_END_TAG:
                if (avail < 2)
                    goto done;
                if (!terminate) {
                    if (ctxt->progressive) {
                        /* > can be found unescaped in attribute values */
                        if ((lastgt == NULL) || (ctxt->input->cur >= lastgt))
                            goto done;
                    } else if (xmlParseLookupSequence(ctxt, '>', 0, 0) < 0) {
                        goto done;
                    }
                }
                if (ctxt->sax2) {
                    xmlParseEndTag2(ctxt, &ctxt->pushTab[ctxt->nameNr - 1]);
                    nameNsPop(ctxt);
                }
#ifdef LIBXML_SAX1_ENABLED
                  else
                    xmlParseEndTag1(ctxt, 0);
#endif /* LIBXML_SAX1_ENABLED */
                if (ctxt->instate == XML_PARSER_EOF) {
                    /* Nothing */
                } else if (ctxt->nameNr == 0) {
                    ctxt->instate = XML_PARSER_EPILOG;
                } else {
                    ctxt->instate = XML_PARSER_CONTENT;
                }
                break;
            case XML_PARSER_CDATA_SECTION: {
                /*
                 * The Push mode need to have the SAX callback for
                 * cdataBlock merge back contiguous callbacks.
                 */
                int base;

                base = xmlParseLookupSequence(ctxt, ']', ']', '>');
                if (base < 0) {
                    if (avail >= XML_PARSER_BIG_BUFFER_SIZE + 2) {
                        int tmp;

                        tmp = xmlCheckCdataPush(ctxt->input->cur,
                                                XML_PARSER_BIG_BUFFER_SIZE, 0);
                        if (tmp < 0) {
                            tmp = -tmp;
                            ctxt->input->cur += tmp;
                            goto encoding_error;
                        }
                        if ((ctxt->sax != NULL) && (!ctxt->disableSAX)) {
                            if (ctxt->sax->cdataBlock != NULL)
                                ctxt->sax->cdataBlock(ctxt->userData,
                                                      ctxt->input->cur, tmp);
                            else if (ctxt->sax->characters != NULL)
                                ctxt->sax->characters(ctxt->userData,
                                                      ctxt->input->cur, tmp);
                        }
                        if (ctxt->instate == XML_PARSER_EOF)
                            goto done;
                        SKIPL(tmp);
                        ctxt->checkIndex = 0;
                    }
                    goto done;
                } else {
                    int tmp;

                    tmp = xmlCheckCdataPush(ctxt->input->cur, base, 1);
                    if ((tmp < 0) || (tmp != base)) {
                        tmp = -tmp;
                        ctxt->input->cur += tmp;
                        goto encoding_error;
                    }
                    if ((ctxt->sax != NULL) && (base == 0) &&
                        (ctxt->sax->cdataBlock != NULL) &&
                        (!ctxt->disableSAX)) {
                        /*
                         * Special case to provide identical behaviour
                         * between pull and push parsers on enpty CDATA
                         * sections
                         */
                         if ((ctxt->input->cur - ctxt->input->base >= 9) &&
                             (!strncmp((const char *)&ctxt->input->cur[-9],
                                       "<![CDATA[", 9)))
                             ctxt->sax->cdataBlock(ctxt->userData,
                                                   BAD_CAST "", 0);
                    } else if ((ctxt->sax != NULL) && (base > 0) &&
                        (!ctxt->disableSAX)) {
                        if (ctxt->sax->cdataBlock != NULL)
                            ctxt->sax->cdataBlock(ctxt->userData,
                                                  ctxt->input->cur, base);
                        else if (ctxt->sax->characters != NULL)
                            ctxt->sax->characters(ctxt->userData,
                                                  ctxt->input->cur, base);
                    }
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    SKIPL(base + 3);
                    ctxt->checkIndex = 0;
                    ctxt->instate = XML_PARSER_CONTENT;
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: entering CONTENT\n");
#endif
                }
                break;
            }
            case XML_PARSER_MISC:
                SKIP_BLANKS;
                if (ctxt->input->buf == NULL)
                    avail = ctxt->input->length -
                            (ctxt->input->cur - ctxt->input->base);
                else
                    avail = xmlBufUse(ctxt->input->buf->buffer) -
                            (ctxt->input->cur - ctxt->input->base);
                if (avail < 2)
                    goto done;
                cur = ctxt->input->cur[0];
                next = ctxt->input->cur[1];
                if ((cur == '<') && (next == '?')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '?', '>', 0) < 0)) {
                        ctxt->progressive = XML_PARSER_PI;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing PI\n");
#endif
                    xmlParsePI(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    ctxt->instate = XML_PARSER_MISC;
                    ctxt->progressive = 1;
                    ctxt->checkIndex = 0;
                } else if ((cur == '<') && (next == '!') &&
                    (ctxt->input->cur[2] == '-') &&
                    (ctxt->input->cur[3] == '-')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '-', '-', '>') < 0)) {
                        ctxt->progressive = XML_PARSER_COMMENT;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing Comment\n");
#endif
                    xmlParseComment(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    ctxt->instate = XML_PARSER_MISC;
                    ctxt->progressive = 1;
                    ctxt->checkIndex = 0;
                } else if ((cur == '<') && (next == '!') &&
                    (ctxt->input->cur[2] == 'D') &&
                    (ctxt->input->cur[3] == 'O') &&
                    (ctxt->input->cur[4] == 'C') &&
                    (ctxt->input->cur[5] == 'T') &&
                    (ctxt->input->cur[6] == 'Y') &&
                    (ctxt->input->cur[7] == 'P') &&
                    (ctxt->input->cur[8] == 'E')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '>', 0, 0) < 0)) {
                        ctxt->progressive = XML_PARSER_DTD;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing internal subset\n");
#endif
                    ctxt->inSubset = 1;
                    ctxt->progressive = 0;
                    ctxt->checkIndex = 0;
                    xmlParseDocTypeDecl(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    if (RAW == '[') {
                        ctxt->instate = XML_PARSER_DTD;
#ifdef DEBUG_PUSH
                        xmlGenericError(xmlGenericErrorContext,
                                "PP: entering DTD\n");
#endif
                    } else {
                        /*
                         * Create and update the external subset.
                         */
                        ctxt->inSubset = 2;
                        if ((ctxt->sax != NULL) && (!ctxt->disableSAX) &&
                            (ctxt->sax->externalSubset != NULL))
                            ctxt->sax->externalSubset(ctxt->userData,
                                    ctxt->intSubName, ctxt->extSubSystem,
                                    ctxt->extSubURI);
                        ctxt->inSubset = 0;
                        xmlCleanSpecialAttr(ctxt);
                        ctxt->instate = XML_PARSER_PROLOG;
#ifdef DEBUG_PUSH
                        xmlGenericError(xmlGenericErrorContext,
                                "PP: entering PROLOG\n");
#endif
                    }
                } else if ((cur == '<') && (next == '!') &&
                           (avail < 9)) {
                    goto done;
                } else {
                    ctxt->instate = XML_PARSER_START_TAG;
                    ctxt->progressive = XML_PARSER_START_TAG;
                    xmlParseGetLasts(ctxt, &lastlt, &lastgt);
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: entering START_TAG\n");
#endif
                }
                break;
            case XML_PARSER_PROLOG:
                SKIP_BLANKS;
                if (ctxt->input->buf == NULL)
                    avail = ctxt->input->length - (ctxt->input->cur - ctxt->input->base);
                else
                    avail = xmlBufUse(ctxt->input->buf->buffer) -
                            (ctxt->input->cur - ctxt->input->base);
                if (avail < 2)
                    goto done;
                cur = ctxt->input->cur[0];
                next = ctxt->input->cur[1];
                if ((cur == '<') && (next == '?')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '?', '>', 0) < 0)) {
                        ctxt->progressive = XML_PARSER_PI;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing PI\n");
#endif
                    xmlParsePI(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    ctxt->instate = XML_PARSER_PROLOG;
                    ctxt->progressive = 1;
                } else if ((cur == '<') && (next == '!') &&
                    (ctxt->input->cur[2] == '-') && (ctxt->input->cur[3] == '-')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '-', '-', '>') < 0)) {
                        ctxt->progressive = XML_PARSER_COMMENT;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing Comment\n");
#endif
                    xmlParseComment(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    ctxt->instate = XML_PARSER_PROLOG;
                    ctxt->progressive = 1;
                } else if ((cur == '<') && (next == '!') &&
                           (avail < 4)) {
                    goto done;
                } else {
                    ctxt->instate = XML_PARSER_START_TAG;
                    if (ctxt->progressive == 0)
                        ctxt->progressive = XML_PARSER_START_TAG;
                    xmlParseGetLasts(ctxt, &lastlt, &lastgt);
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: entering START_TAG\n");
#endif
                }
                break;
            case XML_PARSER_EPILOG:
                SKIP_BLANKS;
                if (ctxt->input->buf == NULL)
                    avail = ctxt->input->length - (ctxt->input->cur - ctxt->input->base);
                else
                    avail = xmlBufUse(ctxt->input->buf->buffer) -
                            (ctxt->input->cur - ctxt->input->base);
                if (avail < 2)
                    goto done;
                cur = ctxt->input->cur[0];
                next = ctxt->input->cur[1];
                if ((cur == '<') && (next == '?')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '?', '>', 0) < 0)) {
                        ctxt->progressive = XML_PARSER_PI;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing PI\n");
#endif
                    xmlParsePI(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    ctxt->instate = XML_PARSER_EPILOG;
                    ctxt->progressive = 1;
                } else if ((cur == '<') && (next == '!') &&
                    (ctxt->input->cur[2] == '-') && (ctxt->input->cur[3] == '-')) {
                    if ((!terminate) &&
                        (xmlParseLookupSequence(ctxt, '-', '-', '>') < 0)) {
                        ctxt->progressive = XML_PARSER_COMMENT;
                        goto done;
                    }
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: Parsing Comment\n");
#endif
                    xmlParseComment(ctxt);
                    if (ctxt->instate == XML_PARSER_EOF)
                        goto done;
                    ctxt->instate = XML_PARSER_EPILOG;
                    ctxt->progressive = 1;
                } else if ((cur == '<') && (next == '!') &&
                           (avail < 4)) {
                    goto done;
                } else {
                    xmlFatalErr(ctxt, XML_ERR_DOCUMENT_END, NULL);
                    xmlHaltParser(ctxt);
#ifdef DEBUG_PUSH
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: entering EOF\n");
#endif
                    if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
                        ctxt->sax->endDocument(ctxt->userData);
                    goto done;
                }
                break;
            case XML_PARSER_DTD: {
                /*
                 * Sorry but progressive parsing of the internal subset
                 * is not expected to be supported. We first check that
                 * the full content of the internal subset is available and
                 * the parsing is launched only at that point.
                 * Internal subset ends up with "']' S? '>'" in an unescaped
                 * section and not in a ']]>' sequence which are conditional
                 * sections (whoever argued to keep that crap in XML deserve
                 * a place in hell !).
                 */
                int base, i;
                xmlChar *buf;
                xmlChar quote = 0;
                size_t use;

                base = ctxt->input->cur - ctxt->input->base;
                if (base < 0) return(0);
                if (ctxt->checkIndex > base)
                    base = ctxt->checkIndex;
                buf = xmlBufContent(ctxt->input->buf->buffer);
                use = xmlBufUse(ctxt->input->buf->buffer);
                for (;(unsigned int) base < use; base++) {
                    if (quote != 0) {
                        if (buf[base] == quote)
                            quote = 0;
                        continue;
                    }
                    if ((quote == 0) && (buf[base] == '<')) {
                        int found  = 0;
                        /* special handling of comments */
                        if (((unsigned int) base + 4 < use) &&
                            (buf[base + 1] == '!') &&
                            (buf[base + 2] == '-') &&
                            (buf[base + 3] == '-')) {
                            for (;(unsigned int) base + 3 < use; base++) {
                                if ((buf[base] == '-') &&
                                    (buf[base + 1] == '-') &&
                                    (buf[base + 2] == '>')) {
                                    found = 1;
                                    base += 2;
                                    break;
                                }
                            }
                            if (!found) {
#if 0
                                fprintf(stderr, "unfinished comment\n");
#endif
                                break; /* for */
                            }
                            continue;
                        }
                    }
                    if (buf[base] == '"') {
                        quote = '"';
                        continue;
                    }
                    if (buf[base] == '\'') {
                        quote = '\'';
                        continue;
                    }
                    if (buf[base] == ']') {
#if 0
                        fprintf(stderr, "%c%c%c%c: ", buf[base],
                                buf[base + 1], buf[base + 2], buf[base + 3]);
#endif
                        if ((unsigned int) base +1 >= use)
                            break;
                        if (buf[base + 1] == ']') {
                            /* conditional crap, skip both ']' ! */
                            base++;
                            continue;
                        }
                        for (i = 1; (unsigned int) base + i < use; i++) {
                            if (buf[base + i] == '>') {
#if 0
                                fprintf(stderr, "found\n");
#endif
                                goto found_end_int_subset;
                            }
                            if (!IS_BLANK_CH(buf[base + i])) {
#if 0
                                fprintf(stderr, "not found\n");
#endif
                                goto not_end_of_int_subset;
                            }
                        }
#if 0
                        fprintf(stderr, "end of stream\n");
#endif
                        break;

                    }
not_end_of_int_subset:
                    continue; /* for */
                }
                /*
                 * We didn't found the end of the Internal subset
                 */
                if (quote == 0)
                    ctxt->checkIndex = base;
                else
                    ctxt->checkIndex = 0;
#ifdef DEBUG_PUSH
                if (next == 0)
                    xmlGenericError(xmlGenericErrorContext,
                            "PP: lookup of int subset end filed\n");
#endif
                goto done;

found_end_int_subset:
                ctxt->checkIndex = 0;
                xmlParseInternalSubset(ctxt);
                if (ctxt->instate == XML_PARSER_EOF)
                    goto done;
                ctxt->inSubset = 2;
                if ((ctxt->sax != NULL) && (!ctxt->disableSAX) &&
                    (ctxt->sax->externalSubset != NULL))
                    ctxt->sax->externalSubset(ctxt->userData, ctxt->intSubName,
                            ctxt->extSubSystem, ctxt->extSubURI);
                ctxt->inSubset = 0;
                xmlCleanSpecialAttr(ctxt);
                if (ctxt->instate == XML_PARSER_EOF)
                    goto done;
                ctxt->instate = XML_PARSER_PROLOG;
                ctxt->checkIndex = 0;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering PROLOG\n");
#endif
                break;
            }
            case XML_PARSER_COMMENT:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == COMMENT\n");
                ctxt->instate = XML_PARSER_CONTENT;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering CONTENT\n");
#endif
                break;
            case XML_PARSER_IGNORE:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == IGNORE");
                ctxt->instate = XML_PARSER_DTD;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering DTD\n");
#endif
                break;
            case XML_PARSER_PI:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == PI\n");
                ctxt->instate = XML_PARSER_CONTENT;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering CONTENT\n");
#endif
                break;
            case XML_PARSER_ENTITY_DECL:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == ENTITY_DECL\n");
                ctxt->instate = XML_PARSER_DTD;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering DTD\n");
#endif
                break;
            case XML_PARSER_ENTITY_VALUE:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == ENTITY_VALUE\n");
                ctxt->instate = XML_PARSER_CONTENT;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering DTD\n");
#endif
                break;
            case XML_PARSER_ATTRIBUTE_VALUE:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == ATTRIBUTE_VALUE\n");
                ctxt->instate = XML_PARSER_START_TAG;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering START_TAG\n");
#endif
                break;
            case XML_PARSER_SYSTEM_LITERAL:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == SYSTEM_LITERAL\n");
                ctxt->instate = XML_PARSER_START_TAG;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering START_TAG\n");
#endif
                break;
            case XML_PARSER_PUBLIC_LITERAL:
                xmlGenericError(xmlGenericErrorContext,
                        "PP: internal error, state == PUBLIC_LITERAL\n");
                ctxt->instate = XML_PARSER_START_TAG;
#ifdef DEBUG_PUSH
                xmlGenericError(xmlGenericErrorContext,
                        "PP: entering START_TAG\n");
#endif
                break;
        }
    }
done:
#ifdef DEBUG_PUSH
    xmlGenericError(xmlGenericErrorContext, "PP: done %d\n", ret);
#endif
    return(ret);
encoding_error:
    {
        char buffer[150];

        snprintf(buffer, 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
                        ctxt->input->cur[0], ctxt->input->cur[1],
                        ctxt->input->cur[2], ctxt->input->cur[3]);
        __xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
                     "Input is not proper UTF-8, indicate encoding !\n%s",
                     BAD_CAST buffer, NULL);
    }
    return(0);
}

/**
 * xmlParseCheckTransition:
 * @ctxt:  an XML parser context
 * @chunk:  a char array
 * @size:  the size in byte of the chunk
 *
 * Check depending on the current parser state if the chunk given must be
 * processed immediately or one need more data to advance on parsing.
 *
 * Returns -1 in case of error, 0 if the push is not needed and 1 if needed
 */
static int
xmlParseCheckTransition(xmlParserCtxtPtr ctxt, const char *chunk, int size) {
    if ((ctxt == NULL) || (chunk == NULL) || (size < 0))
        return(-1);
    if (ctxt->instate == XML_PARSER_START_TAG) {
        if (memchr(chunk, '>', size) != NULL)
            return(1);
        return(0);
    }
    if (ctxt->progressive == XML_PARSER_COMMENT) {
        if (memchr(chunk, '>', size) != NULL)
            return(1);
        return(0);
    }
    if (ctxt->instate == XML_PARSER_CDATA_SECTION) {
        if (memchr(chunk, '>', size) != NULL)
            return(1);
        return(0);
    }
    if (ctxt->progressive == XML_PARSER_PI) {
        if (memchr(chunk, '>', size) != NULL)
            return(1);
        return(0);
    }
    if (ctxt->instate == XML_PARSER_END_TAG) {
        if (memchr(chunk, '>', size) != NULL)
            return(1);
        return(0);
    }
    if ((ctxt->progressive == XML_PARSER_DTD) ||
        (ctxt->instate == XML_PARSER_DTD)) {
        if (memchr(chunk, '>', size) != NULL)
            return(1);
        return(0);
    }
    return(1);
}

/**
 * xmlParseChunk:
 * @ctxt:  an XML parser context
 * @chunk:  an char array
 * @size:  the size in byte of the chunk
 * @terminate:  last chunk indicator
 *
 * Parse a Chunk of memory
 *
 * Returns zero if no error, the xmlParserErrors otherwise.
 */
int
xmlParseChunk(xmlParserCtxtPtr ctxt, const char *chunk, int size,
              int terminate) {
    int end_in_lf = 0;
    int remain = 0;
    size_t old_avail = 0;
    size_t avail = 0;

    if (ctxt == NULL)
        return(XML_ERR_INTERNAL_ERROR);
    if ((ctxt->errNo != XML_ERR_OK) && (ctxt->disableSAX == 1))
        return(ctxt->errNo);
    if (ctxt->instate == XML_PARSER_EOF)
        return(-1);
    if (ctxt->instate == XML_PARSER_START)
        xmlDetectSAX2(ctxt);
    if ((size > 0) && (chunk != NULL) && (!terminate) &&
        (chunk[size - 1] == '\r')) {
        end_in_lf = 1;
        size--;
    }

xmldecl_done:

    if ((size > 0) && (chunk != NULL) && (ctxt->input != NULL) &&
        (ctxt->input->buf != NULL) && (ctxt->instate != XML_PARSER_EOF))  {
        size_t base = xmlBufGetInputBase(ctxt->input->buf->buffer, ctxt->input);
        size_t cur = ctxt->input->cur - ctxt->input->base;
        int res;

        old_avail = xmlBufUse(ctxt->input->buf->buffer);
        /*
         * Specific handling if we autodetected an encoding, we should not
         * push more than the first line ... which depend on the encoding
         * And only push the rest once the final encoding was detected
         */
        if ((ctxt->instate == XML_PARSER_START) && (ctxt->input != NULL) &&
            (ctxt->input->buf != NULL) && (ctxt->input->buf->encoder != NULL)) {
            unsigned int len = 45;

            if ((xmlStrcasestr(BAD_CAST ctxt->input->buf->encoder->name,
                               BAD_CAST "UTF-16")) ||
                (xmlStrcasestr(BAD_CAST ctxt->input->buf->encoder->name,
                               BAD_CAST "UTF16")))
                len = 90;
            else if ((xmlStrcasestr(BAD_CAST ctxt->input->buf->encoder->name,
                                    BAD_CAST "UCS-4")) ||
                     (xmlStrcasestr(BAD_CAST ctxt->input->buf->encoder->name,
                                    BAD_CAST "UCS4")))
                len = 180;

            if (ctxt->input->buf->rawconsumed < len)
                len -= ctxt->input->buf->rawconsumed;

            /*
             * Change size for reading the initial declaration only
             * if size is greater than len. Otherwise, memmove in xmlBufferAdd
             * will blindly copy extra bytes from memory.
             */
            if ((unsigned int) size > len) {
                remain = size - len;
                size = len;
            } else {
                remain = 0;
            }
        }
        res = xmlParserInputBufferPush(ctxt->input->buf, size, chunk);
        xmlBufSetInputBaseCur(ctxt->input->buf->buffer, ctxt->input, base, cur);
        if (res < 0) {
            ctxt->errNo = XML_PARSER_EOF;
            xmlHaltParser(ctxt);
            return (XML_PARSER_EOF);
        }
#ifdef DEBUG_PUSH
        xmlGenericError(xmlGenericErrorContext, "PP: pushed %d\n", size);
#endif

    } else if (ctxt->instate != XML_PARSER_EOF) {
        if ((ctxt->input != NULL) && ctxt->input->buf != NULL) {
            xmlParserInputBufferPtr in = ctxt->input->buf;
            if ((in->encoder != NULL) && (in->buffer != NULL) &&
                    (in->raw != NULL)) {
                int nbchars;
                size_t base = xmlBufGetInputBase(in->buffer, ctxt->input);
                size_t current = ctxt->input->cur - ctxt->input->base;

                nbchars = xmlCharEncInput(in, terminate);
                xmlBufSetInputBaseCur(in->buffer, ctxt->input, base, current);
                if (nbchars < 0) {
                    /* TODO 2.6.0 */
                    xmlGenericError(xmlGenericErrorContext,
                                    "xmlParseChunk: encoder error\n");
                    xmlHaltParser(ctxt);
                    return(XML_ERR_INVALID_ENCODING);
                }
            }
        }
    }
    if (remain != 0) {
        xmlParseTryOrFinish(ctxt, 0);
    } else {
        if ((ctxt->input != NULL) && (ctxt->input->buf != NULL))
            avail = xmlBufUse(ctxt->input->buf->buffer);
        /*
         * Depending on the current state it may not be such
         * a good idea to try parsing if there is nothing in the chunk
         * which would be worth doing a parser state transition and we
         * need to wait for more data
         */
        if ((terminate) || (avail > XML_MAX_TEXT_LENGTH) ||
            (old_avail == 0) || (avail == 0) ||
            (xmlParseCheckTransition(ctxt,
                       (const char *)&ctxt->input->base[old_avail],
                                     avail - old_avail)))
            xmlParseTryOrFinish(ctxt, terminate);
    }
    if (ctxt->instate == XML_PARSER_EOF)
        return(ctxt->errNo);

    if ((ctxt->input != NULL) &&
         (((ctxt->input->end - ctxt->input->cur) > XML_MAX_LOOKUP_LIMIT) ||
         ((ctxt->input->cur - ctxt->input->base) > XML_MAX_LOOKUP_LIMIT)) &&
        ((ctxt->options & XML_PARSE_HUGE) == 0)) {
        xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "Huge input lookup");
        xmlHaltParser(ctxt);
    }
    if ((ctxt->errNo != XML_ERR_OK) && (ctxt->disableSAX == 1))
        return(ctxt->errNo);

    if (remain != 0) {
        chunk += size;
        size = remain;
        remain = 0;
        goto xmldecl_done;
    }
    if ((end_in_lf == 1) && (ctxt->input != NULL) &&
        (ctxt->input->buf != NULL)) {
        size_t base = xmlBufGetInputBase(ctxt->input->buf->buffer,
                                         ctxt->input);
        size_t current = ctxt->input->cur - ctxt->input->base;

        xmlParserInputBufferPush(ctxt->input->buf, 1, "\r");

        xmlBufSetInputBaseCur(ctxt->input->buf->buffer, ctxt->input,
                              base, current);
    }
    if (terminate) {
        /*
         * Check for termination
         */
        int cur_avail = 0;

        if (ctxt->input != NULL) {
            if (ctxt->input->buf == NULL)
                cur_avail = ctxt->input->length -
                            (ctxt->input->cur - ctxt->input->base);
            else
                cur_avail = xmlBufUse(ctxt->input->buf->buffer) -
                                      (ctxt->input->cur - ctxt->input->base);
        }

        if ((ctxt->instate != XML_PARSER_EOF) &&
            (ctxt->instate != XML_PARSER_EPILOG)) {
            xmlFatalErr(ctxt, XML_ERR_DOCUMENT_END, NULL);
        }
        if ((ctxt->instate == XML_PARSER_EPILOG) && (cur_avail > 0)) {
            xmlFatalErr(ctxt, XML_ERR_DOCUMENT_END, NULL);
        }
        if (ctxt->instate != XML_PARSER_EOF) {
            if ((ctxt->sax) && (ctxt->sax->endDocument != NULL))
                ctxt->sax->endDocument(ctxt->userData);
        }
        ctxt->instate = XML_PARSER_EOF;
    }
    if (ctxt->wellFormed == 0)
        return((xmlParserErrors) ctxt->errNo);
    else
        return(0);
}

/************************************************************************
 *                                                                      *
 *              I/O front end functions to the parser                   *
 *                                                                      *
 ************************************************************************/

/**
 * xmlCreatePushParserCtxt:
 * @sax:  a SAX handler
 * @user_data:  The user data returned on SAX callbacks
 * @chunk:  a pointer to an array of chars
 * @size:  number of chars in the array
 * @filename:  an optional file name or URI
 *
 * Create a parser context for using the XML parser in push mode.
 * If @buffer and @size are non-NULL, the data is used to detect
 * the encoding.  The remaining characters will be parsed so they
 * don't need to be fed in again through xmlParseChunk.
 * To allow content encoding detection, @size should be >= 4
 * The value of @filename is used for fetching external entities
 * and error/warning reports.
 *
 * Returns the new parser context or NULL
 */

xmlParserCtxtPtr
xmlCreatePushParserCtxt(xmlSAXHandlerPtr sax, void *user_data,
                        const char *chunk, int size, const char *filename) {
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr inputStream;
    xmlParserInputBufferPtr buf;
    xmlCharEncoding enc = XML_CHAR_ENCODING_NONE;

    /*
     * plug some encoding conversion routines
     */
    if ((chunk != NULL) && (size >= 4))
        enc = xmlDetectCharEncoding((const xmlChar *) chunk, size);

    buf = xmlAllocParserInputBuffer(enc);
    if (buf == NULL) return(NULL);

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlErrMemory(NULL, "creating parser: out of memory\n");
        xmlFreeParserInputBuffer(buf);
        return(NULL);
    }
    ctxt->dictNames = 1;
    if (sax != NULL) {
#ifdef LIBXML_SAX1_ENABLED
        if (ctxt->sax != (xmlSAXHandlerPtr) &xmlDefaultSAXHandler)
#endif /* LIBXML_SAX1_ENABLED */
            xmlFree(ctxt->sax);
        ctxt->sax = (xmlSAXHandlerPtr) xmlMalloc(sizeof(xmlSAXHandler));
        if (ctxt->sax == NULL) {
            xmlErrMemory(ctxt, NULL);
            xmlFreeParserInputBuffer(buf);
            xmlFreeParserCtxt(ctxt);
            return(NULL);
        }
        memset(ctxt->sax, 0, sizeof(xmlSAXHandler));
        if (sax->initialized == XML_SAX2_MAGIC)
            memcpy(ctxt->sax, sax, sizeof(xmlSAXHandler));
        else
            memcpy(ctxt->sax, sax, sizeof(xmlSAXHandlerV1));
        if (user_data != NULL)
            ctxt->userData = user_data;
    }
    if (filename == NULL) {
        ctxt->directory = NULL;
    } else {
        ctxt->directory = xmlParserGetDirectory(filename);
    }

    inputStream = xmlNewInputStream(ctxt);
    if (inputStream == NULL) {
        xmlFreeParserCtxt(ctxt);
        xmlFreeParserInputBuffer(buf);
        return(NULL);
    }

    if (filename == NULL)
        inputStream->filename = NULL;
    else {
        inputStream->filename = (char *)
            xmlCanonicPath((const xmlChar *) filename);
        if (inputStream->filename == NULL) {
            xmlFreeParserCtxt(ctxt);
            xmlFreeParserInputBuffer(buf);
            return(NULL);
        }
    }
    inputStream->buf = buf;
    xmlBufResetInput(inputStream->buf->buffer, inputStream);
    inputPush(ctxt, inputStream);

    /*
     * If the caller didn't provide an initial 'chunk' for determining
     * the encoding, we set the context to XML_CHAR_ENCODING_NONE so
     * that it can be automatically determined later
     */
    if ((size == 0) || (chunk == NULL)) {
        ctxt->charset = XML_CHAR_ENCODING_NONE;
    } else if ((ctxt->input != NULL) && (ctxt->input->buf != NULL)) {
        size_t base = xmlBufGetInputBase(ctxt->input->buf->buffer, ctxt->input);
        size_t cur = ctxt->input->cur - ctxt->input->base;

        xmlParserInputBufferPush(ctxt->input->buf, size, chunk);

        xmlBufSetInputBaseCur(ctxt->input->buf->buffer, ctxt->input, base, cur);
#ifdef DEBUG_PUSH
        xmlGenericError(xmlGenericErrorContext, "PP: pushed %d\n", size);
#endif
    }

    if (enc != XML_CHAR_ENCODING_NONE) {
        xmlSwitchEncoding(ctxt, enc);
    }

    return(ctxt);
}
#endif /* LIBXML_PUSH_ENABLED */

/**
 * xmlHaltParser:
 * @ctxt:  an XML parser context
 *
 * Blocks further parser processing don't override error
 * for internal use
 */
static void
xmlHaltParser(xmlParserCtxtPtr ctxt) {
    if (ctxt == NULL)
        return;
    ctxt->instate = XML_PARSER_EOF;
    ctxt->disableSAX = 1;
    while (ctxt->inputNr > 1)
        xmlFreeInputStream(inputPop(ctxt));
    if (ctxt->input != NULL) {
        /*
         * in case there was a specific allocation deallocate before
         * overriding base
         */
        if (ctxt->input->free != NULL) {
            ctxt->input->free((xmlChar *) ctxt->input->base);
            ctxt->input->free = NULL;
        }
        if (ctxt->input->buf != NULL) {
            xmlFreeParserInputBuffer(ctxt->input->buf);
            ctxt->input->buf = NULL;
        }
        ctxt->input->cur = BAD_CAST"";
        ctxt->input->length = 0;
        ctxt->input->base = ctxt->input->cur;
        ctxt->input->end = ctxt->input->cur;
    }
}

/**
 * xmlStopParser:
 * @ctxt:  an XML parser context
 *
 * Blocks further parser processing
 */
void
xmlStopParser(xmlParserCtxtPtr ctxt) {
    if (ctxt == NULL)
        return;
    xmlHaltParser(ctxt);
    ctxt->errNo = XML_ERR_USER_STOP;
}

/**
 * xmlCreateIOParserCtxt:
 * @sax:  a SAX handler
 * @user_data:  The user data returned on SAX callbacks
 * @ioread:  an I/O read function
 * @ioclose:  an I/O close function
 * @ioctx:  an I/O handler
 * @enc:  the charset encoding if known
 *
 * Create a parser context for using the XML parser with an existing
 * I/O stream
 *
 * Returns the new parser context or NULL
 */
xmlParserCtxtPtr
xmlCreateIOParserCtxt(xmlSAXHandlerPtr sax, void *user_data,
        xmlInputReadCallback   ioread, xmlInputCloseCallback  ioclose,
        void *ioctx, xmlCharEncoding enc) {
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr inputStream;
    xmlParserInputBufferPtr buf;

    if (ioread == NULL) return(NULL);

    buf = xmlParserInputBufferCreateIO(ioread, ioclose, ioctx, enc);
    if (buf == NULL) {
        if (ioclose != NULL)
            ioclose(ioctx);
        return (NULL);
    }

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlFreeParserInputBuffer(buf);
        return(NULL);
    }
    if (sax != NULL) {
#ifdef LIBXML_SAX1_ENABLED
        if (ctxt->sax != (xmlSAXHandlerPtr) &xmlDefaultSAXHandler)
#endif /* LIBXML_SAX1_ENABLED */
            xmlFree(ctxt->sax);
        ctxt->sax = (xmlSAXHandlerPtr) xmlMalloc(sizeof(xmlSAXHandler));
        if (ctxt->sax == NULL) {
            xmlFreeParserInputBuffer(buf);
            xmlErrMemory(ctxt, NULL);
            xmlFreeParserCtxt(ctxt);
            return(NULL);
        }
        memset(ctxt->sax, 0, sizeof(xmlSAXHandler));
        if (sax->initialized == XML_SAX2_MAGIC)
            memcpy(ctxt->sax, sax, sizeof(xmlSAXHandler));
        else
            memcpy(ctxt->sax, sax, sizeof(xmlSAXHandlerV1));
        if (user_data != NULL)
            ctxt->userData = user_data;
    }

    inputStream = xmlNewIOInputStream(ctxt, buf, enc);
    if (inputStream == NULL) {
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }
    inputPush(ctxt, inputStream);

    return(ctxt);
}

#ifdef LIBXML_VALID_ENABLED
/************************************************************************
 *                                                                      *
 *              Front ends when parsing a DTD                           *
 *                                                                      *
 ************************************************************************/

/**
 * xmlIOParseDTD:
 * @sax:  the SAX handler block or NULL
 * @input:  an Input Buffer
 * @enc:  the charset encoding if known
 *
 * Load and parse a DTD
 *
 * Returns the resulting xmlDtdPtr or NULL in case of error.
 * @input will be freed by the function in any case.
 */

xmlDtdPtr
xmlIOParseDTD(xmlSAXHandlerPtr sax, xmlParserInputBufferPtr input,
              xmlCharEncoding enc) {
    xmlDtdPtr ret = NULL;
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr pinput = NULL;
    xmlChar start[4];

    if (input == NULL)
        return(NULL);

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlFreeParserInputBuffer(input);
        return(NULL);
    }

    /* We are loading a DTD */
    ctxt->options |= XML_PARSE_DTDLOAD;

    /*
     * Set-up the SAX context
     */
    if (sax != NULL) {
        if (ctxt->sax != NULL)
            xmlFree(ctxt->sax);
        ctxt->sax = sax;
        ctxt->userData = ctxt;
    }
    xmlDetectSAX2(ctxt);

    /*
     * generate a parser input from the I/O handler
     */

    pinput = xmlNewIOInputStream(ctxt, input, XML_CHAR_ENCODING_NONE);
    if (pinput == NULL) {
        if (sax != NULL) ctxt->sax = NULL;
        xmlFreeParserInputBuffer(input);
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }

    /*
     * plug some encoding conversion routines here.
     */
    if (xmlPushInput(ctxt, pinput) < 0) {
        if (sax != NULL) ctxt->sax = NULL;
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }
    if (enc != XML_CHAR_ENCODING_NONE) {
        xmlSwitchEncoding(ctxt, enc);
    }

    pinput->filename = NULL;
    pinput->line = 1;
    pinput->col = 1;
    pinput->base = ctxt->input->cur;
    pinput->cur = ctxt->input->cur;
    pinput->free = NULL;

    /*
     * let's parse that entity knowing it's an external subset.
     */
    ctxt->inSubset = 2;
    ctxt->myDoc = xmlNewDoc(BAD_CAST "1.0");
    if (ctxt->myDoc == NULL) {
        xmlErrMemory(ctxt, "New Doc failed");
        return(NULL);
    }
    ctxt->myDoc->properties = XML_DOC_INTERNAL;
    ctxt->myDoc->extSubset = xmlNewDtd(ctxt->myDoc, BAD_CAST "none",
                                       BAD_CAST "none", BAD_CAST "none");

    if ((enc == XML_CHAR_ENCODING_NONE) &&
        ((ctxt->input->end - ctxt->input->cur) >= 4)) {
        /*
         * Get the 4 first bytes and decode the charset
         * if enc != XML_CHAR_ENCODING_NONE
         * plug some encoding conversion routines.
         */
        start[0] = RAW;
        start[1] = NXT(1);
        start[2] = NXT(2);
        start[3] = NXT(3);
        enc = xmlDetectCharEncoding(start, 4);
        if (enc != XML_CHAR_ENCODING_NONE) {
            xmlSwitchEncoding(ctxt, enc);
        }
    }

    xmlParseExternalSubset(ctxt, BAD_CAST "none", BAD_CAST "none");

    if (ctxt->myDoc != NULL) {
        if (ctxt->wellFormed) {
            ret = ctxt->myDoc->extSubset;
            ctxt->myDoc->extSubset = NULL;
            if (ret != NULL) {
                xmlNodePtr tmp;

                ret->doc = NULL;
                tmp = ret->children;
                while (tmp != NULL) {
                    tmp->doc = NULL;
                    tmp = tmp->next;
                }
            }
        } else {
            ret = NULL;
        }
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }
    if (sax != NULL) ctxt->sax = NULL;
    xmlFreeParserCtxt(ctxt);

    return(ret);
}

/**
 * xmlSAXParseDTD:
 * @sax:  the SAX handler block
 * @ExternalID:  a NAME* containing the External ID of the DTD
 * @SystemID:  a NAME* containing the URL to the DTD
 *
 * Load and parse an external subset.
 *
 * Returns the resulting xmlDtdPtr or NULL in case of error.
 */

xmlDtdPtr
xmlSAXParseDTD(xmlSAXHandlerPtr sax, const xmlChar *ExternalID,
                          const xmlChar *SystemID) {
    xmlDtdPtr ret = NULL;
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr input = NULL;
    xmlCharEncoding enc;
    xmlChar* systemIdCanonic;

    if ((ExternalID == NULL) && (SystemID == NULL)) return(NULL);

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        return(NULL);
    }

    /* We are loading a DTD */
    ctxt->options |= XML_PARSE_DTDLOAD;

    /*
     * Set-up the SAX context
     */
    if (sax != NULL) {
        if (ctxt->sax != NULL)
            xmlFree(ctxt->sax);
        ctxt->sax = sax;
        ctxt->userData = ctxt;
    }

    /*
     * Canonicalise the system ID
     */
    systemIdCanonic = xmlCanonicPath(SystemID);
    if ((SystemID != NULL) && (systemIdCanonic == NULL)) {
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }

    /*
     * Ask the Entity resolver to load the damn thing
     */

    if ((ctxt->sax != NULL) && (ctxt->sax->resolveEntity != NULL))
        input = ctxt->sax->resolveEntity(ctxt->userData, ExternalID,
                                         systemIdCanonic);
    if (input == NULL) {
        if (sax != NULL) ctxt->sax = NULL;
        xmlFreeParserCtxt(ctxt);
        if (systemIdCanonic != NULL)
            xmlFree(systemIdCanonic);
        return(NULL);
    }

    /*
     * plug some encoding conversion routines here.
     */
    if (xmlPushInput(ctxt, input) < 0) {
        if (sax != NULL) ctxt->sax = NULL;
        xmlFreeParserCtxt(ctxt);
        if (systemIdCanonic != NULL)
            xmlFree(systemIdCanonic);
        return(NULL);
    }
    if ((ctxt->input->end - ctxt->input->cur) >= 4) {
        enc = xmlDetectCharEncoding(ctxt->input->cur, 4);
        xmlSwitchEncoding(ctxt, enc);
    }

    if (input->filename == NULL)
        input->filename = (char *) systemIdCanonic;
    else
        xmlFree(systemIdCanonic);
    input->line = 1;
    input->col = 1;
    input->base = ctxt->input->cur;
    input->cur = ctxt->input->cur;
    input->free = NULL;

    /*
     * let's parse that entity knowing it's an external subset.
     */
    ctxt->inSubset = 2;
    ctxt->myDoc = xmlNewDoc(BAD_CAST "1.0");
    if (ctxt->myDoc == NULL) {
        xmlErrMemory(ctxt, "New Doc failed");
        if (sax != NULL) ctxt->sax = NULL;
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }
    ctxt->myDoc->properties = XML_DOC_INTERNAL;
    ctxt->myDoc->extSubset = xmlNewDtd(ctxt->myDoc, BAD_CAST "none",
                                       ExternalID, SystemID);
    xmlParseExternalSubset(ctxt, ExternalID, SystemID);

    if (ctxt->myDoc != NULL) {
        if (ctxt->wellFormed) {
            ret = ctxt->myDoc->extSubset;
            ctxt->myDoc->extSubset = NULL;
            if (ret != NULL) {
                xmlNodePtr tmp;

                ret->doc = NULL;
                tmp = ret->children;
                while (tmp != NULL) {
                    tmp->doc = NULL;
                    tmp = tmp->next;
                }
            }
        } else {
            ret = NULL;
        }
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }
    if (sax != NULL) ctxt->sax = NULL;
    xmlFreeParserCtxt(ctxt);

    return(ret);
}


/**
 * xmlParseDTD:
 * @ExternalID:  a NAME* containing the External ID of the DTD
 * @SystemID:  a NAME* containing the URL to the DTD
 *
 * Load and parse an external subset.
 *
 * Returns the resulting xmlDtdPtr or NULL in case of error.
 */

xmlDtdPtr
xmlParseDTD(const xmlChar *ExternalID, const xmlChar *SystemID) {
    return(xmlSAXParseDTD(NULL, ExternalID, SystemID));
}
#endif /* LIBXML_VALID_ENABLED */

/************************************************************************
 *                                                                      *
 *              Front ends when parsing an Entity                       *
 *                                                                      *
 ************************************************************************/

/**
 * xmlParseCtxtExternalEntity:
 * @ctx:  the existing parsing context
 * @URL:  the URL for the entity to load
 * @ID:  the System ID for the entity to load
 * @lst:  the return value for the set of parsed nodes
 *
 * Parse an external general entity within an existing parsing context
 * An external general parsed entity is well-formed if it matches the
 * production labeled extParsedEnt.
 *
 * [78] extParsedEnt ::= TextDecl? content
 *
 * Returns 0 if the entity is well formed, -1 in case of args problem and
 *    the parser error code otherwise
 */

int
xmlParseCtxtExternalEntity(xmlParserCtxtPtr ctx, const xmlChar *URL,
                       const xmlChar *ID, xmlNodePtr *lst) {
    void *userData;

    if (ctx == NULL) return(-1);
    /*
     * If the user provided their own SAX callbacks, then reuse the
     * userData callback field, otherwise the expected setup in a
     * DOM builder is to have userData == ctxt
     */
    if (ctx->userData == ctx)
        userData = NULL;
    else
        userData = ctx->userData;
    return xmlParseExternalEntityPrivate(ctx->myDoc, ctx, ctx->sax,
                                         userData, ctx->depth + 1,
                                         URL, ID, lst);
}

/**
 * xmlParseExternalEntityPrivate:
 * @doc:  the document the chunk pertains to
 * @oldctxt:  the previous parser context if available
 * @sax:  the SAX handler block (possibly NULL)
 * @user_data:  The user data returned on SAX callbacks (possibly NULL)
 * @depth:  Used for loop detection, use 0
 * @URL:  the URL for the entity to load
 * @ID:  the System ID for the entity to load
 * @list:  the return value for the set of parsed nodes
 *
 * Private version of xmlParseExternalEntity()
 *
 * Returns 0 if the entity is well formed, -1 in case of args problem and
 *    the parser error code otherwise
 */

static xmlParserErrors
xmlParseExternalEntityPrivate(xmlDocPtr doc, xmlParserCtxtPtr oldctxt,
                      xmlSAXHandlerPtr sax,
                      void *user_data, int depth, const xmlChar *URL,
                      const xmlChar *ID, xmlNodePtr *list) {
    xmlParserCtxtPtr ctxt;
    xmlDocPtr newDoc;
    xmlNodePtr newRoot;
    xmlSAXHandlerPtr oldsax = NULL;
    xmlParserErrors ret = XML_ERR_OK;
    xmlChar start[4];
    xmlCharEncoding enc;

    if (((depth > 40) &&
        ((oldctxt == NULL) || (oldctxt->options & XML_PARSE_HUGE) == 0)) ||
        (depth > 1024)) {
        return(XML_ERR_ENTITY_LOOP);
    }

    if (list != NULL)
        *list = NULL;
    if ((URL == NULL) && (ID == NULL))
        return(XML_ERR_INTERNAL_ERROR);
    if (doc == NULL)
        return(XML_ERR_INTERNAL_ERROR);


    ctxt = xmlCreateEntityParserCtxtInternal(URL, ID, NULL, oldctxt);
    if (ctxt == NULL) return(XML_WAR_UNDECLARED_ENTITY);
    ctxt->userData = ctxt;
    if (sax != NULL) {
        oldsax = ctxt->sax;
        ctxt->sax = sax;
        if (user_data != NULL)
            ctxt->userData = user_data;
    }
    xmlDetectSAX2(ctxt);
    newDoc = xmlNewDoc(BAD_CAST "1.0");
    if (newDoc == NULL) {
        xmlFreeParserCtxt(ctxt);
        return(XML_ERR_INTERNAL_ERROR);
    }
    newDoc->properties = XML_DOC_INTERNAL;
    if (doc) {
        newDoc->intSubset = doc->intSubset;
        newDoc->extSubset = doc->extSubset;
        if (doc->dict) {
            newDoc->dict = doc->dict;
            xmlDictReference(newDoc->dict);
        }
        if (doc->URL != NULL) {
            newDoc->URL = xmlStrdup(doc->URL);
        }
    }
    newRoot = xmlNewDocNode(newDoc, NULL, BAD_CAST "pseudoroot", NULL);
    if (newRoot == NULL) {
        if (sax != NULL)
            ctxt->sax = oldsax;
        xmlFreeParserCtxt(ctxt);
        newDoc->intSubset = NULL;
        newDoc->extSubset = NULL;
        xmlFreeDoc(newDoc);
        return(XML_ERR_INTERNAL_ERROR);
    }
    xmlAddChild((xmlNodePtr) newDoc, newRoot);
    nodePush(ctxt, newDoc->children);
    if (doc == NULL) {
        ctxt->myDoc = newDoc;
    } else {
        ctxt->myDoc = doc;
        newRoot->doc = doc;
    }

    /*
     * Get the 4 first bytes and decode the charset
     * if enc != XML_CHAR_ENCODING_NONE
     * plug some encoding conversion routines.
     */
    GROW;
    if ((ctxt->input->end - ctxt->input->cur) >= 4) {
        start[0] = RAW;
        start[1] = NXT(1);
        start[2] = NXT(2);
        start[3] = NXT(3);
        enc = xmlDetectCharEncoding(start, 4);
        if (enc != XML_CHAR_ENCODING_NONE) {
            xmlSwitchEncoding(ctxt, enc);
        }
    }

    /*
     * Parse a possible text declaration first
     */
    if ((CMP5(CUR_PTR, '<', '?', 'x', 'm', 'l')) && (IS_BLANK_CH(NXT(5)))) {
        xmlParseTextDecl(ctxt);
        /*
         * An XML-1.0 document can't reference an entity not XML-1.0
         */
        if ((xmlStrEqual(oldctxt->version, BAD_CAST "1.0")) &&
            (!xmlStrEqual(ctxt->input->version, BAD_CAST "1.0"))) {
            xmlFatalErrMsg(ctxt, XML_ERR_VERSION_MISMATCH,
                           "Version mismatch between document and entity\n");
        }
    }

    ctxt->instate = XML_PARSER_CONTENT;
    ctxt->depth = depth;
    if (oldctxt != NULL) {
        ctxt->_private = oldctxt->_private;
        ctxt->loadsubset = oldctxt->loadsubset;
        ctxt->validate = oldctxt->validate;
        ctxt->valid = oldctxt->valid;
        ctxt->replaceEntities = oldctxt->replaceEntities;
        if (oldctxt->validate) {
            ctxt->vctxt.error = oldctxt->vctxt.error;
            ctxt->vctxt.warning = oldctxt->vctxt.warning;
            ctxt->vctxt.userData = oldctxt->vctxt.userData;
        }
        ctxt->external = oldctxt->external;
        if (ctxt->dict) xmlDictFree(ctxt->dict);
        ctxt->dict = oldctxt->dict;
        ctxt->str_xml = xmlDictLookup(ctxt->dict, BAD_CAST "xml", 3);
        ctxt->str_xmlns = xmlDictLookup(ctxt->dict, BAD_CAST "xmlns", 5);
        ctxt->str_xml_ns = xmlDictLookup(ctxt->dict, XML_XML_NAMESPACE, 36);
        ctxt->dictNames = oldctxt->dictNames;
        ctxt->attsDefault = oldctxt->attsDefault;
        ctxt->attsSpecial = oldctxt->attsSpecial;
        ctxt->linenumbers = oldctxt->linenumbers;
        ctxt->record_info = oldctxt->record_info;
        ctxt->node_seq.maximum = oldctxt->node_seq.maximum;
        ctxt->node_seq.length = oldctxt->node_seq.length;
        ctxt->node_seq.buffer = oldctxt->node_seq.buffer;
    } else {
        /*
         * Doing validity checking on chunk without context
         * doesn't make sense
         */
        ctxt->_private = NULL;
        ctxt->validate = 0;
        ctxt->external = 2;
        ctxt->loadsubset = 0;
    }

    xmlParseContent(ctxt);

    if ((RAW == '<') && (NXT(1) == '/')) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    } else if (RAW != 0) {
        xmlFatalErr(ctxt, XML_ERR_EXTRA_CONTENT, NULL);
    }
    if (ctxt->node != newDoc->children) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    }

    if (!ctxt->wellFormed) {
        if (ctxt->errNo == 0)
            ret = XML_ERR_INTERNAL_ERROR;
        else
            ret = (xmlParserErrors)ctxt->errNo;
    } else {
        if (list != NULL) {
            xmlNodePtr cur;

            /*
             * Return the newly created nodeset after unlinking it from
             * they pseudo parent.
             */
            cur = newDoc->children->children;
            *list = cur;
            while (cur != NULL) {
                cur->parent = NULL;
                cur = cur->next;
            }
            newDoc->children->children = NULL;
        }
        ret = XML_ERR_OK;
    }

    /*
     * Record in the parent context the number of entities replacement
     * done when parsing that reference.
     */
    if (oldctxt != NULL)
        oldctxt->nbentities += ctxt->nbentities;

    /*
     * Also record the size of the entity parsed
     */
    if (ctxt->input != NULL && oldctxt != NULL) {
        oldctxt->sizeentities += ctxt->input->consumed;
        oldctxt->sizeentities += (ctxt->input->cur - ctxt->input->base);
    }
    /*
     * And record the last error if any
     */
    if ((oldctxt != NULL) && (ctxt->lastError.code != XML_ERR_OK))
        xmlCopyError(&ctxt->lastError, &oldctxt->lastError);

    if (sax != NULL)
        ctxt->sax = oldsax;
    if (oldctxt != NULL) {
        ctxt->dict = NULL;
        ctxt->attsDefault = NULL;
        ctxt->attsSpecial = NULL;
        oldctxt->validate = ctxt->validate;
        oldctxt->valid = ctxt->valid;
        oldctxt->node_seq.maximum = ctxt->node_seq.maximum;
        oldctxt->node_seq.length = ctxt->node_seq.length;
        oldctxt->node_seq.buffer = ctxt->node_seq.buffer;
    }
    ctxt->node_seq.maximum = 0;
    ctxt->node_seq.length = 0;
    ctxt->node_seq.buffer = NULL;
    xmlFreeParserCtxt(ctxt);
    newDoc->intSubset = NULL;
    newDoc->extSubset = NULL;
    xmlFreeDoc(newDoc);

    return(ret);
}

#ifdef LIBXML_SAX1_ENABLED
/**
 * xmlParseExternalEntity:
 * @doc:  the document the chunk pertains to
 * @sax:  the SAX handler block (possibly NULL)
 * @user_data:  The user data returned on SAX callbacks (possibly NULL)
 * @depth:  Used for loop detection, use 0
 * @URL:  the URL for the entity to load
 * @ID:  the System ID for the entity to load
 * @lst:  the return value for the set of parsed nodes
 *
 * Parse an external general entity
 * An external general parsed entity is well-formed if it matches the
 * production labeled extParsedEnt.
 *
 * [78] extParsedEnt ::= TextDecl? content
 *
 * Returns 0 if the entity is well formed, -1 in case of args problem and
 *    the parser error code otherwise
 */

int
xmlParseExternalEntity(xmlDocPtr doc, xmlSAXHandlerPtr sax, void *user_data,
          int depth, const xmlChar *URL, const xmlChar *ID, xmlNodePtr *lst) {
    return(xmlParseExternalEntityPrivate(doc, NULL, sax, user_data, depth, URL,
                                       ID, lst));
}

/**
 * xmlParseBalancedChunkMemory:
 * @doc:  the document the chunk pertains to (must not be NULL)
 * @sax:  the SAX handler block (possibly NULL)
 * @user_data:  The user data returned on SAX callbacks (possibly NULL)
 * @depth:  Used for loop detection, use 0
 * @string:  the input string in UTF8 or ISO-Latin (zero terminated)
 * @lst:  the return value for the set of parsed nodes
 *
 * Parse a well-balanced chunk of an XML document
 * called by the parser
 * The allowed sequence for the Well Balanced Chunk is the one defined by
 * the content production in the XML grammar:
 *
 * [43] content ::= (element | CharData | Reference | CDSect | PI | Comment)*
 *
 * Returns 0 if the chunk is well balanced, -1 in case of args problem and
 *    the parser error code otherwise
 */

int
xmlParseBalancedChunkMemory(xmlDocPtr doc, xmlSAXHandlerPtr sax,
     void *user_data, int depth, const xmlChar *string, xmlNodePtr *lst) {
    return xmlParseBalancedChunkMemoryRecover( doc, sax, user_data,
                                                depth, string, lst, 0 );
}
#endif /* LIBXML_SAX1_ENABLED */

/**
 * xmlParseBalancedChunkMemoryInternal:
 * @oldctxt:  the existing parsing context
 * @string:  the input string in UTF8 or ISO-Latin (zero terminated)
 * @user_data:  the user data field for the parser context
 * @lst:  the return value for the set of parsed nodes
 *
 *
 * Parse a well-balanced chunk of an XML document
 * called by the parser
 * The allowed sequence for the Well Balanced Chunk is the one defined by
 * the content production in the XML grammar:
 *
 * [43] content ::= (element | CharData | Reference | CDSect | PI | Comment)*
 *
 * Returns XML_ERR_OK if the chunk is well balanced, and the parser
 * error code otherwise
 *
 * In case recover is set to 1, the nodelist will not be empty even if
 * the parsed chunk is not well balanced.
 */
static xmlParserErrors
xmlParseBalancedChunkMemoryInternal(xmlParserCtxtPtr oldctxt,
        const xmlChar *string, void *user_data, xmlNodePtr *lst) {
    xmlParserCtxtPtr ctxt;
    xmlDocPtr newDoc = NULL;
    xmlNodePtr newRoot;
    xmlSAXHandlerPtr oldsax = NULL;
    xmlNodePtr content = NULL;
    xmlNodePtr last = NULL;
    int size;
    xmlParserErrors ret = XML_ERR_OK;
#ifdef SAX2
    int i;
#endif

    if (((oldctxt->depth > 40) && ((oldctxt->options & XML_PARSE_HUGE) == 0)) ||
        (oldctxt->depth >  1024)) {
        return(XML_ERR_ENTITY_LOOP);
    }


    if (lst != NULL)
        *lst = NULL;
    if (string == NULL)
        return(XML_ERR_INTERNAL_ERROR);

    size = xmlStrlen(string);

    ctxt = xmlCreateMemoryParserCtxt((char *) string, size);
    if (ctxt == NULL) return(XML_WAR_UNDECLARED_ENTITY);
    if (user_data != NULL)
        ctxt->userData = user_data;
    else
        ctxt->userData = ctxt;
    if (ctxt->dict != NULL) xmlDictFree(ctxt->dict);
    ctxt->dict = oldctxt->dict;
    ctxt->input_id = oldctxt->input_id + 1;
    ctxt->str_xml = xmlDictLookup(ctxt->dict, BAD_CAST "xml", 3);
    ctxt->str_xmlns = xmlDictLookup(ctxt->dict, BAD_CAST "xmlns", 5);
    ctxt->str_xml_ns = xmlDictLookup(ctxt->dict, XML_XML_NAMESPACE, 36);

#ifdef SAX2
    /* propagate namespaces down the entity */
    for (i = 0;i < oldctxt->nsNr;i += 2) {
        nsPush(ctxt, oldctxt->nsTab[i], oldctxt->nsTab[i+1]);
    }
#endif

    oldsax = ctxt->sax;
    ctxt->sax = oldctxt->sax;
    xmlDetectSAX2(ctxt);
    ctxt->replaceEntities = oldctxt->replaceEntities;
    ctxt->options = oldctxt->options;

    ctxt->_private = oldctxt->_private;
    if (oldctxt->myDoc == NULL) {
        newDoc = xmlNewDoc(BAD_CAST "1.0");
        if (newDoc == NULL) {
            ctxt->sax = oldsax;
            ctxt->dict = NULL;
            xmlFreeParserCtxt(ctxt);
            return(XML_ERR_INTERNAL_ERROR);
        }
        newDoc->properties = XML_DOC_INTERNAL;
        newDoc->dict = ctxt->dict;
        xmlDictReference(newDoc->dict);
        ctxt->myDoc = newDoc;
    } else {
        ctxt->myDoc = oldctxt->myDoc;
        content = ctxt->myDoc->children;
        last = ctxt->myDoc->last;
    }
    newRoot = xmlNewDocNode(ctxt->myDoc, NULL, BAD_CAST "pseudoroot", NULL);
    if (newRoot == NULL) {
        ctxt->sax = oldsax;
        ctxt->dict = NULL;
        xmlFreeParserCtxt(ctxt);
        if (newDoc != NULL) {
            xmlFreeDoc(newDoc);
        }
        return(XML_ERR_INTERNAL_ERROR);
    }
    ctxt->myDoc->children = NULL;
    ctxt->myDoc->last = NULL;
    xmlAddChild((xmlNodePtr) ctxt->myDoc, newRoot);
    nodePush(ctxt, ctxt->myDoc->children);
    ctxt->instate = XML_PARSER_CONTENT;
    ctxt->depth = oldctxt->depth + 1;

    ctxt->validate = 0;
    ctxt->loadsubset = oldctxt->loadsubset;
    if ((oldctxt->validate) || (oldctxt->replaceEntities != 0)) {
        /*
         * ID/IDREF registration will be done in xmlValidateElement below
         */
        ctxt->loadsubset |= XML_SKIP_IDS;
    }
    ctxt->dictNames = oldctxt->dictNames;
    ctxt->attsDefault = oldctxt->attsDefault;
    ctxt->attsSpecial = oldctxt->attsSpecial;

    xmlParseContent(ctxt);
    if ((RAW == '<') && (NXT(1) == '/')) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    } else if (RAW != 0) {
        xmlFatalErr(ctxt, XML_ERR_EXTRA_CONTENT, NULL);
    }
    if (ctxt->node != ctxt->myDoc->children) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    }

    if (!ctxt->wellFormed) {
        if (ctxt->errNo == 0)
            ret = XML_ERR_INTERNAL_ERROR;
        else
            ret = (xmlParserErrors)ctxt->errNo;
    } else {
      ret = XML_ERR_OK;
    }

    if ((lst != NULL) && (ret == XML_ERR_OK)) {
        xmlNodePtr cur;

        /*
         * Return the newly created nodeset after unlinking it from
         * they pseudo parent.
         */
        cur = ctxt->myDoc->children->children;
        *lst = cur;
        while (cur != NULL) {
#ifdef LIBXML_VALID_ENABLED
            if ((oldctxt->validate) && (oldctxt->wellFormed) &&
                (oldctxt->myDoc) && (oldctxt->myDoc->intSubset) &&
                (cur->type == XML_ELEMENT_NODE)) {
                oldctxt->valid &= xmlValidateElement(&oldctxt->vctxt,
                        oldctxt->myDoc, cur);
            }
#endif /* LIBXML_VALID_ENABLED */
            cur->parent = NULL;
            cur = cur->next;
        }
        ctxt->myDoc->children->children = NULL;
    }
    if (ctxt->myDoc != NULL) {
        xmlFreeNode(ctxt->myDoc->children);
        ctxt->myDoc->children = content;
        ctxt->myDoc->last = last;
    }

    /*
     * Record in the parent context the number of entities replacement
     * done when parsing that reference.
     */
    if (oldctxt != NULL)
        oldctxt->nbentities += ctxt->nbentities;

    /*
     * Also record the last error if any
     */
    if (ctxt->lastError.code != XML_ERR_OK)
        xmlCopyError(&ctxt->lastError, &oldctxt->lastError);

    ctxt->sax = oldsax;
    ctxt->dict = NULL;
    ctxt->attsDefault = NULL;
    ctxt->attsSpecial = NULL;
    xmlFreeParserCtxt(ctxt);
    if (newDoc != NULL) {
        xmlFreeDoc(newDoc);
    }

    return(ret);
}

/**
 * xmlParseInNodeContext:
 * @node:  the context node
 * @data:  the input string
 * @datalen:  the input string length in bytes
 * @options:  a combination of xmlParserOption
 * @lst:  the return value for the set of parsed nodes
 *
 * Parse a well-balanced chunk of an XML document
 * within the context (DTD, namespaces, etc ...) of the given node.
 *
 * The allowed sequence for the data is a Well Balanced Chunk defined by
 * the content production in the XML grammar:
 *
 * [43] content ::= (element | CharData | Reference | CDSect | PI | Comment)*
 *
 * Returns XML_ERR_OK if the chunk is well balanced, and the parser
 * error code otherwise
 */
xmlParserErrors
xmlParseInNodeContext(xmlNodePtr node, const char *data, int datalen,
                      int options, xmlNodePtr *lst) {
#ifdef SAX2
    xmlParserCtxtPtr ctxt;
    xmlDocPtr doc = NULL;
    xmlNodePtr fake, cur;
    int nsnr = 0;

    xmlParserErrors ret = XML_ERR_OK;

    /*
     * check all input parameters, grab the document
     */
    if ((lst == NULL) || (node == NULL) || (data == NULL) || (datalen < 0))
        return(XML_ERR_INTERNAL_ERROR);
    switch (node->type) {
        case XML_ELEMENT_NODE:
        case XML_ATTRIBUTE_NODE:
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE:
            break;
        default:
            return(XML_ERR_INTERNAL_ERROR);

    }
    while ((node != NULL) && (node->type != XML_ELEMENT_NODE) &&
           (node->type != XML_DOCUMENT_NODE) &&
           (node->type != XML_HTML_DOCUMENT_NODE))
        node = node->parent;
    if (node == NULL)
        return(XML_ERR_INTERNAL_ERROR);
    if (node->type == XML_ELEMENT_NODE)
        doc = node->doc;
    else
        doc = (xmlDocPtr) node;
    if (doc == NULL)
        return(XML_ERR_INTERNAL_ERROR);

    /*
     * allocate a context and set-up everything not related to the
     * node position in the tree
     */
    if (doc->type == XML_DOCUMENT_NODE)
        ctxt = xmlCreateMemoryParserCtxt((char *) data, datalen);
#ifdef LIBXML_HTML_ENABLED
    else if (doc->type == XML_HTML_DOCUMENT_NODE) {
        ctxt = htmlCreateMemoryParserCtxt((char *) data, datalen);
        /*
         * When parsing in context, it makes no sense to add implied
         * elements like html/body/etc...
         */
        options |= HTML_PARSE_NOIMPLIED;
    }
#endif
    else
        return(XML_ERR_INTERNAL_ERROR);

    if (ctxt == NULL)
        return(XML_ERR_NO_MEMORY);

    /*
     * Use input doc's dict if present, else assure XML_PARSE_NODICT is set.
     * We need a dictionary for xmlDetectSAX2, so if there's no doc dict
     * we must wait until the last moment to free the original one.
     */
    if (doc->dict != NULL) {
        if (ctxt->dict != NULL)
            xmlDictFree(ctxt->dict);
        ctxt->dict = doc->dict;
    } else
        options |= XML_PARSE_NODICT;

    if (doc->encoding != NULL) {
        xmlCharEncodingHandlerPtr hdlr;

        if (ctxt->encoding != NULL)
            xmlFree((xmlChar *) ctxt->encoding);
        ctxt->encoding = xmlStrdup((const xmlChar *) doc->encoding);

        hdlr = xmlFindCharEncodingHandler((const char *) doc->encoding);
        if (hdlr != NULL) {
            xmlSwitchToEncoding(ctxt, hdlr);
        } else {
            return(XML_ERR_UNSUPPORTED_ENCODING);
        }
    }

    xmlCtxtUseOptionsInternal(ctxt, options, NULL);
    xmlDetectSAX2(ctxt);
    ctxt->myDoc = doc;
    /* parsing in context, i.e. as within existing content */
    ctxt->input_id = 2;
    ctxt->instate = XML_PARSER_CONTENT;

    fake = xmlNewDocComment(node->doc, NULL);
    if (fake == NULL) {
        xmlFreeParserCtxt(ctxt);
        return(XML_ERR_NO_MEMORY);
    }
    xmlAddChild(node, fake);

    if (node->type == XML_ELEMENT_NODE) {
        nodePush(ctxt, node);
        /*
         * initialize the SAX2 namespaces stack
         */
        cur = node;
        while ((cur != NULL) && (cur->type == XML_ELEMENT_NODE)) {
            xmlNsPtr ns = cur->nsDef;
            const xmlChar *iprefix, *ihref;

            while (ns != NULL) {
                if (ctxt->dict) {
                    iprefix = xmlDictLookup(ctxt->dict, ns->prefix, -1);
                    ihref = xmlDictLookup(ctxt->dict, ns->href, -1);
                } else {
                    iprefix = ns->prefix;
                    ihref = ns->href;
                }

                if (xmlGetNamespace(ctxt, iprefix) == NULL) {
                    nsPush(ctxt, iprefix, ihref);
                    nsnr++;
                }
                ns = ns->next;
            }
            cur = cur->parent;
        }
    }

    if ((ctxt->validate) || (ctxt->replaceEntities != 0)) {
        /*
         * ID/IDREF registration will be done in xmlValidateElement below
         */
        ctxt->loadsubset |= XML_SKIP_IDS;
    }

#ifdef LIBXML_HTML_ENABLED
    if (doc->type == XML_HTML_DOCUMENT_NODE)
        __htmlParseContent(ctxt);
    else
#endif
        xmlParseContent(ctxt);

    nsPop(ctxt, nsnr);
    if ((RAW == '<') && (NXT(1) == '/')) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    } else if (RAW != 0) {
        xmlFatalErr(ctxt, XML_ERR_EXTRA_CONTENT, NULL);
    }
    if ((ctxt->node != NULL) && (ctxt->node != node)) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
        ctxt->wellFormed = 0;
    }

    if (!ctxt->wellFormed) {
        if (ctxt->errNo == 0)
            ret = XML_ERR_INTERNAL_ERROR;
        else
            ret = (xmlParserErrors)ctxt->errNo;
    } else {
        ret = XML_ERR_OK;
    }

    /*
     * Return the newly created nodeset after unlinking it from
     * the pseudo sibling.
     */

    cur = fake->next;
    fake->next = NULL;
    node->last = fake;

    if (cur != NULL) {
        cur->prev = NULL;
    }

    *lst = cur;

    while (cur != NULL) {
        cur->parent = NULL;
        cur = cur->next;
    }

    xmlUnlinkNode(fake);
    xmlFreeNode(fake);


    if (ret != XML_ERR_OK) {
        xmlFreeNodeList(*lst);
        *lst = NULL;
    }

    if (doc->dict != NULL)
        ctxt->dict = NULL;
    xmlFreeParserCtxt(ctxt);

    return(ret);
#else /* !SAX2 */
    return(XML_ERR_INTERNAL_ERROR);
#endif
}

#ifdef LIBXML_SAX1_ENABLED
/**
 * xmlParseBalancedChunkMemoryRecover:
 * @doc:  the document the chunk pertains to (must not be NULL)
 * @sax:  the SAX handler block (possibly NULL)
 * @user_data:  The user data returned on SAX callbacks (possibly NULL)
 * @depth:  Used for loop detection, use 0
 * @string:  the input string in UTF8 or ISO-Latin (zero terminated)
 * @lst:  the return value for the set of parsed nodes
 * @recover: return nodes even if the data is broken (use 0)
 *
 *
 * Parse a well-balanced chunk of an XML document
 * called by the parser
 * The allowed sequence for the Well Balanced Chunk is the one defined by
 * the content production in the XML grammar:
 *
 * [43] content ::= (element | CharData | Reference | CDSect | PI | Comment)*
 *
 * Returns 0 if the chunk is well balanced, -1 in case of args problem and
 *    the parser error code otherwise
 *
 * In case recover is set to 1, the nodelist will not be empty even if
 * the parsed chunk is not well balanced, assuming the parsing succeeded to
 * some extent.
 */
int
xmlParseBalancedChunkMemoryRecover(xmlDocPtr doc, xmlSAXHandlerPtr sax,
     void *user_data, int depth, const xmlChar *string, xmlNodePtr *lst,
     int recover) {
    xmlParserCtxtPtr ctxt;
    xmlDocPtr newDoc;
    xmlSAXHandlerPtr oldsax = NULL;
    xmlNodePtr content, newRoot;
    int size;
    int ret = 0;

    if (depth > 40) {
        return(XML_ERR_ENTITY_LOOP);
    }


    if (lst != NULL)
        *lst = NULL;
    if (string == NULL)
        return(-1);

    size = xmlStrlen(string);

    ctxt = xmlCreateMemoryParserCtxt((char *) string, size);
    if (ctxt == NULL) return(-1);
    ctxt->userData = ctxt;
    if (sax != NULL) {
        oldsax = ctxt->sax;
        ctxt->sax = sax;
        if (user_data != NULL)
            ctxt->userData = user_data;
    }
    newDoc = xmlNewDoc(BAD_CAST "1.0");
    if (newDoc == NULL) {
        xmlFreeParserCtxt(ctxt);
        return(-1);
    }
    newDoc->properties = XML_DOC_INTERNAL;
    if ((doc != NULL) && (doc->dict != NULL)) {
        xmlDictFree(ctxt->dict);
        ctxt->dict = doc->dict;
        xmlDictReference(ctxt->dict);
        ctxt->str_xml = xmlDictLookup(ctxt->dict, BAD_CAST "xml", 3);
        ctxt->str_xmlns = xmlDictLookup(ctxt->dict, BAD_CAST "xmlns", 5);
        ctxt->str_xml_ns = xmlDictLookup(ctxt->dict, XML_XML_NAMESPACE, 36);
        ctxt->dictNames = 1;
    } else {
        xmlCtxtUseOptionsInternal(ctxt, XML_PARSE_NODICT, NULL);
    }
    /* doc == NULL is only supported for historic reasons */
    if (doc != NULL) {
        newDoc->intSubset = doc->intSubset;
        newDoc->extSubset = doc->extSubset;
    }
    newRoot = xmlNewDocNode(newDoc, NULL, BAD_CAST "pseudoroot", NULL);
    if (newRoot == NULL) {
        if (sax != NULL)
            ctxt->sax = oldsax;
        xmlFreeParserCtxt(ctxt);
        newDoc->intSubset = NULL;
        newDoc->extSubset = NULL;
        xmlFreeDoc(newDoc);
        return(-1);
    }
    xmlAddChild((xmlNodePtr) newDoc, newRoot);
    nodePush(ctxt, newRoot);
    /* doc == NULL is only supported for historic reasons */
    if (doc == NULL) {
        ctxt->myDoc = newDoc;
    } else {
        ctxt->myDoc = newDoc;
        newDoc->children->doc = doc;
        /* Ensure that doc has XML spec namespace */
        xmlSearchNsByHref(doc, (xmlNodePtr)doc, XML_XML_NAMESPACE);
        newDoc->oldNs = doc->oldNs;
    }
    ctxt->instate = XML_PARSER_CONTENT;
    ctxt->input_id = 2;
    ctxt->depth = depth;

    /*
     * Doing validity checking on chunk doesn't make sense
     */
    ctxt->validate = 0;
    ctxt->loadsubset = 0;
    xmlDetectSAX2(ctxt);

    if ( doc != NULL ){
        content = doc->children;
        doc->children = NULL;
        xmlParseContent(ctxt);
        doc->children = content;
    }
    else {
        xmlParseContent(ctxt);
    }
    if ((RAW == '<') && (NXT(1) == '/')) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    } else if (RAW != 0) {
        xmlFatalErr(ctxt, XML_ERR_EXTRA_CONTENT, NULL);
    }
    if (ctxt->node != newDoc->children) {
        xmlFatalErr(ctxt, XML_ERR_NOT_WELL_BALANCED, NULL);
    }

    if (!ctxt->wellFormed) {
        if (ctxt->errNo == 0)
            ret = 1;
        else
            ret = ctxt->errNo;
    } else {
      ret = 0;
    }

    if ((lst != NULL) && ((ret == 0) || (recover == 1))) {
        xmlNodePtr cur;

        /*
         * Return the newly created nodeset after unlinking it from
         * they pseudo parent.
         */
        cur = newDoc->children->children;
        *lst = cur;
        while (cur != NULL) {
            xmlSetTreeDoc(cur, doc);
            cur->parent = NULL;
            cur = cur->next;
        }
        newDoc->children->children = NULL;
    }

    if (sax != NULL)
        ctxt->sax = oldsax;
    xmlFreeParserCtxt(ctxt);
    newDoc->intSubset = NULL;
    newDoc->extSubset = NULL;
    /* This leaks the namespace list if doc == NULL */
    newDoc->oldNs = NULL;
    xmlFreeDoc(newDoc);

    return(ret);
}

/**
 * xmlSAXParseEntity:
 * @sax:  the SAX handler block
 * @filename:  the filename
 *
 * parse an XML external entity out of context and build a tree.
 * It use the given SAX function block to handle the parsing callback.
 * If sax is NULL, fallback to the default DOM tree building routines.
 *
 * [78] extParsedEnt ::= TextDecl? content
 *
 * This correspond to a "Well Balanced" chunk
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlSAXParseEntity(xmlSAXHandlerPtr sax, const char *filename) {
    xmlDocPtr ret;
    xmlParserCtxtPtr ctxt;

    ctxt = xmlCreateFileParserCtxt(filename);
    if (ctxt == NULL) {
        return(NULL);
    }
    if (sax != NULL) {
        if (ctxt->sax != NULL)
            xmlFree(ctxt->sax);
        ctxt->sax = sax;
        ctxt->userData = NULL;
    }

    xmlParseExtParsedEnt(ctxt);

    if (ctxt->wellFormed)
        ret = ctxt->myDoc;
    else {
        ret = NULL;
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }
    if (sax != NULL)
        ctxt->sax = NULL;
    xmlFreeParserCtxt(ctxt);

    return(ret);
}

/**
 * xmlParseEntity:
 * @filename:  the filename
 *
 * parse an XML external entity out of context and build a tree.
 *
 * [78] extParsedEnt ::= TextDecl? content
 *
 * This correspond to a "Well Balanced" chunk
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlParseEntity(const char *filename) {
    return(xmlSAXParseEntity(NULL, filename));
}
#endif /* LIBXML_SAX1_ENABLED */

/**
 * xmlCreateEntityParserCtxtInternal:
 * @URL:  the entity URL
 * @ID:  the entity PUBLIC ID
 * @base:  a possible base for the target URI
 * @pctx:  parser context used to set options on new context
 *
 * Create a parser context for an external entity
 * Automatic support for ZLIB/Compress compressed document is provided
 * by default if found at compile-time.
 *
 * Returns the new parser context or NULL
 */
static xmlParserCtxtPtr
xmlCreateEntityParserCtxtInternal(const xmlChar *URL, const xmlChar *ID,
                          const xmlChar *base, xmlParserCtxtPtr pctx) {
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr inputStream;
    char *directory = NULL;
    xmlChar *uri;

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        return(NULL);
    }

    if (pctx != NULL) {
        ctxt->options = pctx->options;
        ctxt->_private = pctx->_private;
        /*
         * this is a subparser of pctx, so the input_id should be
         * incremented to distinguish from main entity
         */
        ctxt->input_id = pctx->input_id + 1;
    }

    /* Don't read from stdin. */
    if (xmlStrcmp(URL, BAD_CAST "-") == 0)
        URL = BAD_CAST "./-";

    uri = xmlBuildURI(URL, base);

    if (uri == NULL) {
        inputStream = xmlLoadExternalEntity((char *)URL, (char *)ID, ctxt);
        if (inputStream == NULL) {
            xmlFreeParserCtxt(ctxt);
            return(NULL);
        }

        inputPush(ctxt, inputStream);

        if ((ctxt->directory == NULL) && (directory == NULL))
            directory = xmlParserGetDirectory((char *)URL);
        if ((ctxt->directory == NULL) && (directory != NULL))
            ctxt->directory = directory;
    } else {
        inputStream = xmlLoadExternalEntity((char *)uri, (char *)ID, ctxt);
        if (inputStream == NULL) {
            xmlFree(uri);
            xmlFreeParserCtxt(ctxt);
            return(NULL);
        }

        inputPush(ctxt, inputStream);

        if ((ctxt->directory == NULL) && (directory == NULL))
            directory = xmlParserGetDirectory((char *)uri);
        if ((ctxt->directory == NULL) && (directory != NULL))
            ctxt->directory = directory;
        xmlFree(uri);
    }
    return(ctxt);
}

/**
 * xmlCreateEntityParserCtxt:
 * @URL:  the entity URL
 * @ID:  the entity PUBLIC ID
 * @base:  a possible base for the target URI
 *
 * Create a parser context for an external entity
 * Automatic support for ZLIB/Compress compressed document is provided
 * by default if found at compile-time.
 *
 * Returns the new parser context or NULL
 */
xmlParserCtxtPtr
xmlCreateEntityParserCtxt(const xmlChar *URL, const xmlChar *ID,
                          const xmlChar *base) {
    return xmlCreateEntityParserCtxtInternal(URL, ID, base, NULL);

}

/************************************************************************
 *                                                                      *
 *              Front ends when parsing from a file                     *
 *                                                                      *
 ************************************************************************/

/**
 * xmlCreateURLParserCtxt:
 * @filename:  the filename or URL
 * @options:  a combination of xmlParserOption
 *
 * Create a parser context for a file or URL content.
 * Automatic support for ZLIB/Compress compressed document is provided
 * by default if found at compile-time and for file accesses
 *
 * Returns the new parser context or NULL
 */
xmlParserCtxtPtr
xmlCreateURLParserCtxt(const char *filename, int options)
{
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr inputStream;
    char *directory = NULL;

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlErrMemory(NULL, "cannot allocate parser context");
        return(NULL);
    }

    if (options)
        xmlCtxtUseOptionsInternal(ctxt, options, NULL);
    ctxt->linenumbers = 1;

    inputStream = xmlLoadExternalEntity(filename, NULL, ctxt);
    if (inputStream == NULL) {
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }

    inputPush(ctxt, inputStream);
    if ((ctxt->directory == NULL) && (directory == NULL))
        directory = xmlParserGetDirectory(filename);
    if ((ctxt->directory == NULL) && (directory != NULL))
        ctxt->directory = directory;

    return(ctxt);
}

/**
 * xmlCreateFileParserCtxt:
 * @filename:  the filename
 *
 * Create a parser context for a file content.
 * Automatic support for ZLIB/Compress compressed document is provided
 * by default if found at compile-time.
 *
 * Returns the new parser context or NULL
 */
xmlParserCtxtPtr
xmlCreateFileParserCtxt(const char *filename)
{
    return(xmlCreateURLParserCtxt(filename, 0));
}

#ifdef LIBXML_SAX1_ENABLED
/**
 * xmlSAXParseFileWithData:
 * @sax:  the SAX handler block
 * @filename:  the filename
 * @recovery:  work in recovery mode, i.e. tries to read no Well Formed
 *             documents
 * @data:  the userdata
 *
 * parse an XML file and build a tree. Automatic support for ZLIB/Compress
 * compressed document is provided by default if found at compile-time.
 * It use the given SAX function block to handle the parsing callback.
 * If sax is NULL, fallback to the default DOM tree building routines.
 *
 * User data (void *) is stored within the parser context in the
 * context's _private member, so it is available nearly everywhere in libxml
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlSAXParseFileWithData(xmlSAXHandlerPtr sax, const char *filename,
                        int recovery, void *data) {
    xmlDocPtr ret;
    xmlParserCtxtPtr ctxt;

    xmlInitParser();

    ctxt = xmlCreateFileParserCtxt(filename);
    if (ctxt == NULL) {
        return(NULL);
    }
    if (sax != NULL) {
        if (ctxt->sax != NULL)
            xmlFree(ctxt->sax);
        ctxt->sax = sax;
    }
    xmlDetectSAX2(ctxt);
    if (data!=NULL) {
        ctxt->_private = data;
    }

    if (ctxt->directory == NULL)
        ctxt->directory = xmlParserGetDirectory(filename);

    ctxt->recovery = recovery;

    xmlParseDocument(ctxt);

    if ((ctxt->wellFormed) || recovery) {
        ret = ctxt->myDoc;
        if ((ret != NULL) && (ctxt->input->buf != NULL)) {
            if (ctxt->input->buf->compressed > 0)
                ret->compression = 9;
            else
                ret->compression = ctxt->input->buf->compressed;
        }
    }
    else {
       ret = NULL;
       xmlFreeDoc(ctxt->myDoc);
       ctxt->myDoc = NULL;
    }
    if (sax != NULL)
        ctxt->sax = NULL;
    xmlFreeParserCtxt(ctxt);

    return(ret);
}

/**
 * xmlSAXParseFile:
 * @sax:  the SAX handler block
 * @filename:  the filename
 * @recovery:  work in recovery mode, i.e. tries to read no Well Formed
 *             documents
 *
 * parse an XML file and build a tree. Automatic support for ZLIB/Compress
 * compressed document is provided by default if found at compile-time.
 * It use the given SAX function block to handle the parsing callback.
 * If sax is NULL, fallback to the default DOM tree building routines.
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlSAXParseFile(xmlSAXHandlerPtr sax, const char *filename,
                          int recovery) {
    return(xmlSAXParseFileWithData(sax,filename,recovery,NULL));
}

/**
 * xmlRecoverDoc:
 * @cur:  a pointer to an array of xmlChar
 *
 * parse an XML in-memory document and build a tree.
 * In the case the document is not Well Formed, a attempt to build a
 * tree is tried anyway
 *
 * Returns the resulting document tree or NULL in case of failure
 */

xmlDocPtr
xmlRecoverDoc(const xmlChar *cur) {
    return(xmlSAXParseDoc(NULL, cur, 1));
}

/**
 * xmlParseFile:
 * @filename:  the filename
 *
 * parse an XML file and build a tree. Automatic support for ZLIB/Compress
 * compressed document is provided by default if found at compile-time.
 *
 * Returns the resulting document tree if the file was wellformed,
 * NULL otherwise.
 */

xmlDocPtr
xmlParseFile(const char *filename) {
    return(xmlSAXParseFile(NULL, filename, 0));
}

/**
 * xmlRecoverFile:
 * @filename:  the filename
 *
 * parse an XML file and build a tree. Automatic support for ZLIB/Compress
 * compressed document is provided by default if found at compile-time.
 * In the case the document is not Well Formed, it attempts to build
 * a tree anyway
 *
 * Returns the resulting document tree or NULL in case of failure
 */

xmlDocPtr
xmlRecoverFile(const char *filename) {
    return(xmlSAXParseFile(NULL, filename, 1));
}


/**
 * xmlSetupParserForBuffer:
 * @ctxt:  an XML parser context
 * @buffer:  a xmlChar * buffer
 * @filename:  a file name
 *
 * Setup the parser context to parse a new buffer; Clears any prior
 * contents from the parser context. The buffer parameter must not be
 * NULL, but the filename parameter can be
 */
void
xmlSetupParserForBuffer(xmlParserCtxtPtr ctxt, const xmlChar* buffer,
                             const char* filename)
{
    xmlParserInputPtr input;

    if ((ctxt == NULL) || (buffer == NULL))
        return;

    input = xmlNewInputStream(ctxt);
    if (input == NULL) {
        xmlErrMemory(NULL, "parsing new buffer: out of memory\n");
        xmlClearParserCtxt(ctxt);
        return;
    }

    xmlClearParserCtxt(ctxt);
    if (filename != NULL)
        input->filename = (char *) xmlCanonicPath((const xmlChar *)filename);
    input->base = buffer;
    input->cur = buffer;
    input->end = &buffer[xmlStrlen(buffer)];
    inputPush(ctxt, input);
}

/**
 * xmlSAXUserParseFile:
 * @sax:  a SAX handler
 * @user_data:  The user data returned on SAX callbacks
 * @filename:  a file name
 *
 * parse an XML file and call the given SAX handler routines.
 * Automatic support for ZLIB/Compress compressed document is provided
 *
 * Returns 0 in case of success or a error number otherwise
 */
int
xmlSAXUserParseFile(xmlSAXHandlerPtr sax, void *user_data,
                    const char *filename) {
    int ret = 0;
    xmlParserCtxtPtr ctxt;

    ctxt = xmlCreateFileParserCtxt(filename);
    if (ctxt == NULL) return -1;
    if (ctxt->sax != (xmlSAXHandlerPtr) &xmlDefaultSAXHandler)
        xmlFree(ctxt->sax);
    ctxt->sax = sax;
    xmlDetectSAX2(ctxt);

    if (user_data != NULL)
        ctxt->userData = user_data;

    xmlParseDocument(ctxt);

    if (ctxt->wellFormed)
        ret = 0;
    else {
        if (ctxt->errNo != 0)
            ret = ctxt->errNo;
        else
            ret = -1;
    }
    if (sax != NULL)
        ctxt->sax = NULL;
    if (ctxt->myDoc != NULL) {
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }
    xmlFreeParserCtxt(ctxt);

    return ret;
}
#endif /* LIBXML_SAX1_ENABLED */

/************************************************************************
 *                                                                      *
 *              Front ends when parsing from memory                     *
 *                                                                      *
 ************************************************************************/

/**
 * xmlCreateMemoryParserCtxt:
 * @buffer:  a pointer to a char array
 * @size:  the size of the array
 *
 * Create a parser context for an XML in-memory document.
 *
 * Returns the new parser context or NULL
 */
xmlParserCtxtPtr
xmlCreateMemoryParserCtxt(const char *buffer, int size) {
    xmlParserCtxtPtr ctxt;
    xmlParserInputPtr input;
    xmlParserInputBufferPtr buf;

    if (buffer == NULL)
        return(NULL);
    if (size <= 0)
        return(NULL);

    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL)
        return(NULL);

    /* TODO: xmlParserInputBufferCreateStatic, requires some serious changes */
    buf = xmlParserInputBufferCreateMem(buffer, size, XML_CHAR_ENCODING_NONE);
    if (buf == NULL) {
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }

    input = xmlNewInputStream(ctxt);
    if (input == NULL) {
        xmlFreeParserInputBuffer(buf);
        xmlFreeParserCtxt(ctxt);
        return(NULL);
    }

    input->filename = NULL;
    input->buf = buf;
    xmlBufResetInput(input->buf->buffer, input);

    inputPush(ctxt, input);
    return(ctxt);
}

#ifdef LIBXML_SAX1_ENABLED
/**
 * xmlSAXParseMemoryWithData:
 * @sax:  the SAX handler block
 * @buffer:  an pointer to a char array
 * @size:  the size of the array
 * @recovery:  work in recovery mode, i.e. tries to read no Well Formed
 *             documents
 * @data:  the userdata
 *
 * parse an XML in-memory block and use the given SAX function block
 * to handle the parsing callback. If sax is NULL, fallback to the default
 * DOM tree building routines.
 *
 * User data (void *) is stored within the parser context in the
 * context's _private member, so it is available nearly everywhere in libxml
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlSAXParseMemoryWithData(xmlSAXHandlerPtr sax, const char *buffer,
                  int size, int recovery, void *data) {
    xmlDocPtr ret;
    xmlParserCtxtPtr ctxt;

    xmlInitParser();

    ctxt = xmlCreateMemoryParserCtxt(buffer, size);
    if (ctxt == NULL) return(NULL);
    if (sax != NULL) {
        if (ctxt->sax != NULL)
            xmlFree(ctxt->sax);
        ctxt->sax = sax;
    }
    xmlDetectSAX2(ctxt);
    if (data!=NULL) {
        ctxt->_private=data;
    }

    ctxt->recovery = recovery;

    xmlParseDocument(ctxt);

    if ((ctxt->wellFormed) || recovery) ret = ctxt->myDoc;
    else {
       ret = NULL;
       xmlFreeDoc(ctxt->myDoc);
       ctxt->myDoc = NULL;
    }
    if (sax != NULL)
        ctxt->sax = NULL;
    xmlFreeParserCtxt(ctxt);

    return(ret);
}

/**
 * xmlSAXParseMemory:
 * @sax:  the SAX handler block
 * @buffer:  an pointer to a char array
 * @size:  the size of the array
 * @recovery:  work in recovery mode, i.e. tries to read not Well Formed
 *             documents
 *
 * parse an XML in-memory block and use the given SAX function block
 * to handle the parsing callback. If sax is NULL, fallback to the default
 * DOM tree building routines.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlSAXParseMemory(xmlSAXHandlerPtr sax, const char *buffer,
                  int size, int recovery) {
    return xmlSAXParseMemoryWithData(sax, buffer, size, recovery, NULL);
}

/**
 * xmlParseMemory:
 * @buffer:  an pointer to a char array
 * @size:  the size of the array
 *
 * parse an XML in-memory block and build a tree.
 *
 * Returns the resulting document tree
 */

xmlDocPtr xmlParseMemory(const char *buffer, int size) {
   return(xmlSAXParseMemory(NULL, buffer, size, 0));
}

/**
 * xmlRecoverMemory:
 * @buffer:  an pointer to a char array
 * @size:  the size of the array
 *
 * parse an XML in-memory block and build a tree.
 * In the case the document is not Well Formed, an attempt to
 * build a tree is tried anyway
 *
 * Returns the resulting document tree or NULL in case of error
 */

xmlDocPtr xmlRecoverMemory(const char *buffer, int size) {
   return(xmlSAXParseMemory(NULL, buffer, size, 1));
}

/**
 * xmlSAXUserParseMemory:
 * @sax:  a SAX handler
 * @user_data:  The user data returned on SAX callbacks
 * @buffer:  an in-memory XML document input
 * @size:  the length of the XML document in bytes
 *
 * A better SAX parsing routine.
 * parse an XML in-memory buffer and call the given SAX handler routines.
 *
 * Returns 0 in case of success or a error number otherwise
 */
int xmlSAXUserParseMemory(xmlSAXHandlerPtr sax, void *user_data,
                          const char *buffer, int size) {
    int ret = 0;
    xmlParserCtxtPtr ctxt;

    xmlInitParser();

    ctxt = xmlCreateMemoryParserCtxt(buffer, size);
    if (ctxt == NULL) return -1;
    if (ctxt->sax != (xmlSAXHandlerPtr) &xmlDefaultSAXHandler)
        xmlFree(ctxt->sax);
    ctxt->sax = sax;
    xmlDetectSAX2(ctxt);

    if (user_data != NULL)
        ctxt->userData = user_data;

    xmlParseDocument(ctxt);

    if (ctxt->wellFormed)
        ret = 0;
    else {
        if (ctxt->errNo != 0)
            ret = ctxt->errNo;
        else
            ret = -1;
    }
    if (sax != NULL)
        ctxt->sax = NULL;
    if (ctxt->myDoc != NULL) {
        xmlFreeDoc(ctxt->myDoc);
        ctxt->myDoc = NULL;
    }
    xmlFreeParserCtxt(ctxt);

    return ret;
}
#endif /* LIBXML_SAX1_ENABLED */

/**
 * xmlCreateDocParserCtxt:
 * @cur:  a pointer to an array of xmlChar
 *
 * Creates a parser context for an XML in-memory document.
 *
 * Returns the new parser context or NULL
 */
xmlParserCtxtPtr
xmlCreateDocParserCtxt(const xmlChar *cur) {
    int len;

    if (cur == NULL)
        return(NULL);
    len = xmlStrlen(cur);
    return(xmlCreateMemoryParserCtxt((const char *)cur, len));
}

#ifdef LIBXML_SAX1_ENABLED
/**
 * xmlSAXParseDoc:
 * @sax:  the SAX handler block
 * @cur:  a pointer to an array of xmlChar
 * @recovery:  work in recovery mode, i.e. tries to read no Well Formed
 *             documents
 *
 * parse an XML in-memory document and build a tree.
 * It use the given SAX function block to handle the parsing callback.
 * If sax is NULL, fallback to the default DOM tree building routines.
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlSAXParseDoc(xmlSAXHandlerPtr sax, const xmlChar *cur, int recovery) {
    xmlDocPtr ret;
    xmlParserCtxtPtr ctxt;
    xmlSAXHandlerPtr oldsax = NULL;

    if (cur == NULL) return(NULL);


    ctxt = xmlCreateDocParserCtxt(cur);
    if (ctxt == NULL) return(NULL);
    if (sax != NULL) {
        oldsax = ctxt->sax;
        ctxt->sax = sax;
        ctxt->userData = NULL;
    }
    xmlDetectSAX2(ctxt);

    xmlParseDocument(ctxt);
    if ((ctxt->wellFormed) || recovery) ret = ctxt->myDoc;
    else {
       ret = NULL;
       xmlFreeDoc(ctxt->myDoc);
       ctxt->myDoc = NULL;
    }
    if (sax != NULL)
        ctxt->sax = oldsax;
    xmlFreeParserCtxt(ctxt);

    return(ret);
}

/**
 * xmlParseDoc:
 * @cur:  a pointer to an array of xmlChar
 *
 * parse an XML in-memory document and build a tree.
 *
 * Returns the resulting document tree
 */

xmlDocPtr
xmlParseDoc(const xmlChar *cur) {
    return(xmlSAXParseDoc(NULL, cur, 0));
}
#endif /* LIBXML_SAX1_ENABLED */

#ifdef LIBXML_LEGACY_ENABLED
/************************************************************************
 *                                                                      *
 *      Specific function to keep track of entities references          *
 *      and used by the XSLT debugger                                   *
 *                                                                      *
 ************************************************************************/

static xmlEntityReferenceFunc xmlEntityRefFunc = NULL;

/**
 * xmlAddEntityReference:
 * @ent : A valid entity
 * @firstNode : A valid first node for children of entity
 * @lastNode : A valid last node of children entity
 *
 * Notify of a reference to an entity of type XML_EXTERNAL_GENERAL_PARSED_ENTITY
 */
static void
xmlAddEntityReference(xmlEntityPtr ent, xmlNodePtr firstNode,
                      xmlNodePtr lastNode)
{
    if (xmlEntityRefFunc != NULL) {
        (*xmlEntityRefFunc) (ent, firstNode, lastNode);
    }
}


/**
 * xmlSetEntityReferenceFunc:
 * @func: A valid function
 *
 * Set the function to call call back when a xml reference has been made
 */
void
xmlSetEntityReferenceFunc(xmlEntityReferenceFunc func)
{
    xmlEntityRefFunc = func;
}
#endif /* LIBXML_LEGACY_ENABLED */

/************************************************************************
 *                                                                      *
 *                              Miscellaneous                           *
 *                                                                      *
 ************************************************************************/

#ifdef LIBXML_XPATH_ENABLED
#include <libxml/xpath.h>
#endif

extern void XMLCDECL xmlGenericErrorDefaultFunc(void *ctx, const char *msg, ...);
static int xmlParserInitialized = 0;

/**
 * xmlInitParser:
 *
 * Initialization function for the XML parser.
 * This is not reentrant. Call once before processing in case of
 * use in multithreaded programs.
 */

void
xmlInitParser(void) {
    if (xmlParserInitialized != 0)
        return;

#if defined(_WIN32) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
    if (xmlFree == free)
        atexit(xmlCleanupParser);
#endif

#ifdef LIBXML_THREAD_ENABLED
    __xmlGlobalInitMutexLock();
    if (xmlParserInitialized == 0) {
#endif
        xmlInitThreads();
        xmlInitGlobals();
        if ((xmlGenericError == xmlGenericErrorDefaultFunc) ||
            (xmlGenericError == NULL))
            initGenericErrorDefaultFunc(NULL);
        xmlInitMemory();
        xmlInitializeDict();
        xmlInitCharEncodingHandlers();
        xmlDefaultSAXHandlerInit();
        xmlRegisterDefaultInputCallbacks();
#ifdef LIBXML_OUTPUT_ENABLED
        xmlRegisterDefaultOutputCallbacks();
#endif /* LIBXML_OUTPUT_ENABLED */
#ifdef LIBXML_HTML_ENABLED
        htmlInitAutoClose();
        htmlDefaultSAXHandlerInit();
#endif
#ifdef LIBXML_XPATH_ENABLED
        xmlXPathInit();
#endif
        xmlParserInitialized = 1;
#ifdef LIBXML_THREAD_ENABLED
    }
    __xmlGlobalInitMutexUnlock();
#endif
}

/**
 * xmlCleanupParser:
 *
 * This function name is somewhat misleading. It does not clean up
 * parser state, it cleans up memory allocated by the library itself.
 * It is a cleanup function for the XML library. It tries to reclaim all
 * related global memory allocated for the library processing.
 * It doesn't deallocate any document related memory. One should
 * call xmlCleanupParser() only when the process has finished using
 * the library and all XML/HTML documents built with it.
 * See also xmlInitParser() which has the opposite function of preparing
 * the library for operations.
 *
 * WARNING: if your application is multithreaded or has plugin support
 *          calling this may crash the application if another thread or
 *          a plugin is still using libxml2. It's sometimes very hard to
 *          guess if libxml2 is in use in the application, some libraries
 *          or plugins may use it without notice. In case of doubt abstain
 *          from calling this function or do it just before calling exit()
 *          to avoid leak reports from valgrind !
 */

void
xmlCleanupParser(void) {
    if (!xmlParserInitialized)
        return;

    xmlCleanupCharEncodingHandlers();
#ifdef LIBXML_CATALOG_ENABLED
    xmlCatalogCleanup();
#endif
    xmlDictCleanup();
    xmlCleanupInputCallbacks();
#ifdef LIBXML_OUTPUT_ENABLED
    xmlCleanupOutputCallbacks();
#endif
#ifdef LIBXML_SCHEMAS_ENABLED
    xmlSchemaCleanupTypes();
    xmlRelaxNGCleanupTypes();
#endif
    xmlCleanupGlobals();
    xmlCleanupThreads(); /* must be last if called not from the main thread */
    xmlCleanupMemory();
    xmlParserInitialized = 0;
}

#if defined(HAVE_ATTRIBUTE_DESTRUCTOR) && !defined(LIBXML_STATIC) && \
    !defined(_WIN32)
static void
ATTRIBUTE_DESTRUCTOR
xmlDestructor(void) {
    /*
     * Calling custom deallocation functions in a destructor can cause
     * problems, for example with Nokogiri.
     */
    if (xmlFree == free)
        xmlCleanupParser();
}
#endif

/************************************************************************
 *                                                                      *
 *      New set (2.6.0) of simpler and more flexible APIs               *
 *                                                                      *
 ************************************************************************/

/**
 * DICT_FREE:
 * @str:  a string
 *
 * Free a string if it is not owned by the "dict" dictionary in the
 * current scope
 */
#define DICT_FREE(str)                                          \
        if ((str) && ((!dict) ||                                \
            (xmlDictOwns(dict, (const xmlChar *)(str)) == 0)))  \
            xmlFree((char *)(str));

/**
 * xmlCtxtReset:
 * @ctxt: an XML parser context
 *
 * Reset a parser context
 */
void
xmlCtxtReset(xmlParserCtxtPtr ctxt)
{
    xmlParserInputPtr input;
    xmlDictPtr dict;

    if (ctxt == NULL)
        return;

    dict = ctxt->dict;

    while ((input = inputPop(ctxt)) != NULL) { /* Non consuming */
        xmlFreeInputStream(input);
    }
    ctxt->inputNr = 0;
    ctxt->input = NULL;

    ctxt->spaceNr = 0;
    if (ctxt->spaceTab != NULL) {
        ctxt->spaceTab[0] = -1;
        ctxt->space = &ctxt->spaceTab[0];
    } else {
        ctxt->space = NULL;
    }


    ctxt->nodeNr = 0;
    ctxt->node = NULL;

    ctxt->nameNr = 0;
    ctxt->name = NULL;

    ctxt->nsNr = 0;

    DICT_FREE(ctxt->version);
    ctxt->version = NULL;
    DICT_FREE(ctxt->encoding);
    ctxt->encoding = NULL;
    DICT_FREE(ctxt->directory);
    ctxt->directory = NULL;
    DICT_FREE(ctxt->extSubURI);
    ctxt->extSubURI = NULL;
    DICT_FREE(ctxt->extSubSystem);
    ctxt->extSubSystem = NULL;
    if (ctxt->myDoc != NULL)
        xmlFreeDoc(ctxt->myDoc);
    ctxt->myDoc = NULL;

    ctxt->standalone = -1;
    ctxt->hasExternalSubset = 0;
    ctxt->hasPErefs = 0;
    ctxt->html = 0;
    ctxt->external = 0;
    ctxt->instate = XML_PARSER_START;
    ctxt->token = 0;

    ctxt->wellFormed = 1;
    ctxt->nsWellFormed = 1;
    ctxt->disableSAX = 0;
    ctxt->valid = 1;
#if 0
    ctxt->vctxt.userData = ctxt;
    ctxt->vctxt.error = xmlParserValidityError;
    ctxt->vctxt.warning = xmlParserValidityWarning;
#endif
    ctxt->record_info = 0;
    ctxt->checkIndex = 0;
    ctxt->inSubset = 0;
    ctxt->errNo = XML_ERR_OK;
    ctxt->depth = 0;
    ctxt->charset = XML_CHAR_ENCODING_UTF8;
    ctxt->catalogs = NULL;
    ctxt->nbentities = 0;
    ctxt->sizeentities = 0;
    ctxt->sizeentcopy = 0;
    xmlInitNodeInfoSeq(&ctxt->node_seq);

    if (ctxt->attsDefault != NULL) {
        xmlHashFree(ctxt->attsDefault, xmlHashDefaultDeallocator);
        ctxt->attsDefault = NULL;
    }
    if (ctxt->attsSpecial != NULL) {
        xmlHashFree(ctxt->attsSpecial, NULL);
        ctxt->attsSpecial = NULL;
    }

#ifdef LIBXML_CATALOG_ENABLED
    if (ctxt->catalogs != NULL)
        xmlCatalogFreeLocal(ctxt->catalogs);
#endif
    if (ctxt->lastError.code != XML_ERR_OK)
        xmlResetError(&ctxt->lastError);
}

/**
 * xmlCtxtResetPush:
 * @ctxt: an XML parser context
 * @chunk:  a pointer to an array of chars
 * @size:  number of chars in the array
 * @filename:  an optional file name or URI
 * @encoding:  the document encoding, or NULL
 *
 * Reset a push parser context
 *
 * Returns 0 in case of success and 1 in case of error
 */
int
xmlCtxtResetPush(xmlParserCtxtPtr ctxt, const char *chunk,
                 int size, const char *filename, const char *encoding)
{
    xmlParserInputPtr inputStream;
    xmlParserInputBufferPtr buf;
    xmlCharEncoding enc = XML_CHAR_ENCODING_NONE;

    if (ctxt == NULL)
        return(1);

    if ((encoding == NULL) && (chunk != NULL) && (size >= 4))
        enc = xmlDetectCharEncoding((const xmlChar *) chunk, size);

    buf = xmlAllocParserInputBuffer(enc);
    if (buf == NULL)
        return(1);

    if (ctxt == NULL) {
        xmlFreeParserInputBuffer(buf);
        return(1);
    }

    xmlCtxtReset(ctxt);

    if (filename == NULL) {
        ctxt->directory = NULL;
    } else {
        ctxt->directory = xmlParserGetDirectory(filename);
    }

    inputStream = xmlNewInputStream(ctxt);
    if (inputStream == NULL) {
        xmlFreeParserInputBuffer(buf);
        return(1);
    }

    if (filename == NULL)
        inputStream->filename = NULL;
    else
        inputStream->filename = (char *)
            xmlCanonicPath((const xmlChar *) filename);
    inputStream->buf = buf;
    xmlBufResetInput(buf->buffer, inputStream);

    inputPush(ctxt, inputStream);

    if ((size > 0) && (chunk != NULL) && (ctxt->input != NULL) &&
        (ctxt->input->buf != NULL)) {
        size_t base = xmlBufGetInputBase(ctxt->input->buf->buffer, ctxt->input);
        size_t cur = ctxt->input->cur - ctxt->input->base;

        xmlParserInputBufferPush(ctxt->input->buf, size, chunk);

        xmlBufSetInputBaseCur(ctxt->input->buf->buffer, ctxt->input, base, cur);
#ifdef DEBUG_PUSH
        xmlGenericError(xmlGenericErrorContext, "PP: pushed %d\n", size);
#endif
    }

    if (encoding != NULL) {
        xmlCharEncodingHandlerPtr hdlr;

        if (ctxt->encoding != NULL)
            xmlFree((xmlChar *) ctxt->encoding);
        ctxt->encoding = xmlStrdup((const xmlChar *) encoding);

        hdlr = xmlFindCharEncodingHandler(encoding);
        if (hdlr != NULL) {
            xmlSwitchToEncoding(ctxt, hdlr);
        } else {
            xmlFatalErrMsgStr(ctxt, XML_ERR_UNSUPPORTED_ENCODING,
                              "Unsupported encoding %s\n", BAD_CAST encoding);
        }
    } else if (enc != XML_CHAR_ENCODING_NONE) {
        xmlSwitchEncoding(ctxt, enc);
    }

    return(0);
}


/**
 * xmlCtxtUseOptionsInternal:
 * @ctxt: an XML parser context
 * @options:  a combination of xmlParserOption
 * @encoding:  the user provided encoding to use
 *
 * Applies the options to the parser context
 *
 * Returns 0 in case of success, the set of unknown or unimplemented options
 *         in case of error.
 */
static int
xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options, const char *encoding)
{
    if (ctxt == NULL)
        return(-1);
    if (encoding != NULL) {
        if (ctxt->encoding != NULL)
            xmlFree((xmlChar *) ctxt->encoding);
        ctxt->encoding = xmlStrdup((const xmlChar *) encoding);
    }
    if (options & XML_PARSE_RECOVER) {
        ctxt->recovery = 1;
        options -= XML_PARSE_RECOVER;
        ctxt->options |= XML_PARSE_RECOVER;
    } else
        ctxt->recovery = 0;
    if (options & XML_PARSE_DTDLOAD) {
        ctxt->loadsubset = XML_DETECT_IDS;
        options -= XML_PARSE_DTDLOAD;
        ctxt->options |= XML_PARSE_DTDLOAD;
    } else
        ctxt->loadsubset = 0;
    if (options & XML_PARSE_DTDATTR) {
        ctxt->loadsubset |= XML_COMPLETE_ATTRS;
        options -= XML_PARSE_DTDATTR;
        ctxt->options |= XML_PARSE_DTDATTR;
    }
    if (options & XML_PARSE_NOENT) {
        ctxt->replaceEntities = 1;
        /* ctxt->loadsubset |= XML_DETECT_IDS; */
        options -= XML_PARSE_NOENT;
        ctxt->options |= XML_PARSE_NOENT;
    } else
        ctxt->replaceEntities = 0;
    if (options & XML_PARSE_PEDANTIC) {
        ctxt->pedantic = 1;
        options -= XML_PARSE_PEDANTIC;
        ctxt->options |= XML_PARSE_PEDANTIC;
    } else
        ctxt->pedantic = 0;
    if (options & XML_PARSE_NOBLANKS) {
        ctxt->keepBlanks = 0;
        ctxt->sax->ignorableWhitespace = xmlSAX2IgnorableWhitespace;
        options -= XML_PARSE_NOBLANKS;
        ctxt->options |= XML_PARSE_NOBLANKS;
    } else
        ctxt->keepBlanks = 1;
    if (options & XML_PARSE_DTDVALID) {
        ctxt->validate = 1;
        if (options & XML_PARSE_NOWARNING)
            ctxt->vctxt.warning = NULL;
        if (options & XML_PARSE_NOERROR)
            ctxt->vctxt.error = NULL;
        options -= XML_PARSE_DTDVALID;
        ctxt->options |= XML_PARSE_DTDVALID;
    } else
        ctxt->validate = 0;
    if (options & XML_PARSE_NOWARNING) {
        ctxt->sax->warning = NULL;
        options -= XML_PARSE_NOWARNING;
    }
    if (options & XML_PARSE_NOERROR) {
        ctxt->sax->error = NULL;
        ctxt->sax->fatalError = NULL;
        options -= XML_PARSE_NOERROR;
    }
#ifdef LIBXML_SAX1_ENABLED
    if (options & XML_PARSE_SAX1) {
        ctxt->sax->startElement = xmlSAX2StartElement;
        ctxt->sax->endElement = xmlSAX2EndElement;
        ctxt->sax->startElementNs = NULL;
        ctxt->sax->endElementNs = NULL;
        ctxt->sax->initialized = 1;
        options -= XML_PARSE_SAX1;
        ctxt->options |= XML_PARSE_SAX1;
    }
#endif /* LIBXML_SAX1_ENABLED */
    if (options & XML_PARSE_NODICT) {
        ctxt->dictNames = 0;
        options -= XML_PARSE_NODICT;
        ctxt->options |= XML_PARSE_NODICT;
    } else {
        ctxt->dictNames = 1;
    }
    if (options & XML_PARSE_NOCDATA) {
        ctxt->sax->cdataBlock = NULL;
        options -= XML_PARSE_NOCDATA;
        ctxt->options |= XML_PARSE_NOCDATA;
    }
    if (options & XML_PARSE_NSCLEAN) {
        ctxt->options |= XML_PARSE_NSCLEAN;
        options -= XML_PARSE_NSCLEAN;
    }
    if (options & XML_PARSE_NONET) {
        ctxt->options |= XML_PARSE_NONET;
        options -= XML_PARSE_NONET;
    }
    if (options & XML_PARSE_COMPACT) {
        ctxt->options |= XML_PARSE_COMPACT;
        options -= XML_PARSE_COMPACT;
    }
    if (options & XML_PARSE_OLD10) {
        ctxt->options |= XML_PARSE_OLD10;
        options -= XML_PARSE_OLD10;
    }
    if (options & XML_PARSE_NOBASEFIX) {
        ctxt->options |= XML_PARSE_NOBASEFIX;
        options -= XML_PARSE_NOBASEFIX;
    }
    if (options & XML_PARSE_HUGE) {
        ctxt->options |= XML_PARSE_HUGE;
        options -= XML_PARSE_HUGE;
        if (ctxt->dict != NULL)
            xmlDictSetLimit(ctxt->dict, 0);
    }
    if (options & XML_PARSE_OLDSAX) {
        ctxt->options |= XML_PARSE_OLDSAX;
        options -= XML_PARSE_OLDSAX;
    }
    if (options & XML_PARSE_IGNORE_ENC) {
        ctxt->options |= XML_PARSE_IGNORE_ENC;
        options -= XML_PARSE_IGNORE_ENC;
    }
    if (options & XML_PARSE_BIG_LINES) {
        ctxt->options |= XML_PARSE_BIG_LINES;
        options -= XML_PARSE_BIG_LINES;
    }
    ctxt->linenumbers = 1;
    return (options);
}

/**
 * xmlCtxtUseOptions:
 * @ctxt: an XML parser context
 * @options:  a combination of xmlParserOption
 *
 * Applies the options to the parser context
 *
 * Returns 0 in case of success, the set of unknown or unimplemented options
 *         in case of error.
 */
int
xmlCtxtUseOptions(xmlParserCtxtPtr ctxt, int options)
{
   return(xmlCtxtUseOptionsInternal(ctxt, options, NULL));
}

/**
 * xmlDoRead:
 * @ctxt:  an XML parser context
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 * @reuse:  keep the context for reuse
 *
 * Common front-end for the xmlRead functions
 *
 * Returns the resulting document tree or NULL
 */
static xmlDocPtr
xmlDoRead(xmlParserCtxtPtr ctxt, const char *URL, const char *encoding,
          int options, int reuse)
{
    xmlDocPtr ret;

    xmlCtxtUseOptionsInternal(ctxt, options, encoding);
    if (encoding != NULL) {
        xmlCharEncodingHandlerPtr hdlr;

        hdlr = xmlFindCharEncodingHandler(encoding);
        if (hdlr != NULL)
            xmlSwitchToEncoding(ctxt, hdlr);
    }
    if ((URL != NULL) && (ctxt->input != NULL) &&
        (ctxt->input->filename == NULL))
        ctxt->input->filename = (char *) xmlStrdup((const xmlChar *) URL);
    xmlParseDocument(ctxt);
    if ((ctxt->wellFormed) || ctxt->recovery)
        ret = ctxt->myDoc;
    else {
        ret = NULL;
        if (ctxt->myDoc != NULL) {
            xmlFreeDoc(ctxt->myDoc);
        }
    }
    ctxt->myDoc = NULL;
    if (!reuse) {
        xmlFreeParserCtxt(ctxt);
    }

    return (ret);
}

/**
 * xmlReadDoc:
 * @cur:  a pointer to a zero terminated string
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML in-memory document and build a tree.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlReadDoc(const xmlChar * cur, const char *URL, const char *encoding, int options)
{
    xmlParserCtxtPtr ctxt;

    if (cur == NULL)
        return (NULL);
    xmlInitParser();

    ctxt = xmlCreateDocParserCtxt(cur);
    if (ctxt == NULL)
        return (NULL);
    return (xmlDoRead(ctxt, URL, encoding, options, 0));
}

/**
 * xmlReadFile:
 * @filename:  a file or URL
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML file from the filesystem or the network.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlReadFile(const char *filename, const char *encoding, int options)
{
    xmlParserCtxtPtr ctxt;

    xmlInitParser();
    ctxt = xmlCreateURLParserCtxt(filename, options);
    if (ctxt == NULL)
        return (NULL);
    return (xmlDoRead(ctxt, NULL, encoding, options, 0));
}

/**
 * xmlReadMemory:
 * @buffer:  a pointer to a char array
 * @size:  the size of the array
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML in-memory document and build a tree.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlReadMemory(const char *buffer, int size, const char *URL, const char *encoding, int options)
{
    xmlParserCtxtPtr ctxt;

    xmlInitParser();
    ctxt = xmlCreateMemoryParserCtxt(buffer, size);
    if (ctxt == NULL)
        return (NULL);
    return (xmlDoRead(ctxt, URL, encoding, options, 0));
}

/**
 * xmlReadFd:
 * @fd:  an open file descriptor
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML from a file descriptor and build a tree.
 * NOTE that the file descriptor will not be closed when the
 *      reader is closed or reset.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlReadFd(int fd, const char *URL, const char *encoding, int options)
{
    xmlParserCtxtPtr ctxt;
    xmlParserInputBufferPtr input;
    xmlParserInputPtr stream;

    if (fd < 0)
        return (NULL);
    xmlInitParser();

    input = xmlParserInputBufferCreateFd(fd, XML_CHAR_ENCODING_NONE);
    if (input == NULL)
        return (NULL);
    input->closecallback = NULL;
    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlFreeParserInputBuffer(input);
        return (NULL);
    }
    stream = xmlNewIOInputStream(ctxt, input, XML_CHAR_ENCODING_NONE);
    if (stream == NULL) {
        xmlFreeParserInputBuffer(input);
        xmlFreeParserCtxt(ctxt);
        return (NULL);
    }
    inputPush(ctxt, stream);
    return (xmlDoRead(ctxt, URL, encoding, options, 0));
}

/**
 * xmlReadIO:
 * @ioread:  an I/O read function
 * @ioclose:  an I/O close function
 * @ioctx:  an I/O handler
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML document from I/O functions and source and build a tree.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlReadIO(xmlInputReadCallback ioread, xmlInputCloseCallback ioclose,
          void *ioctx, const char *URL, const char *encoding, int options)
{
    xmlParserCtxtPtr ctxt;
    xmlParserInputBufferPtr input;
    xmlParserInputPtr stream;

    if (ioread == NULL)
        return (NULL);
    xmlInitParser();

    input = xmlParserInputBufferCreateIO(ioread, ioclose, ioctx,
                                         XML_CHAR_ENCODING_NONE);
    if (input == NULL) {
        if (ioclose != NULL)
            ioclose(ioctx);
        return (NULL);
    }
    ctxt = xmlNewParserCtxt();
    if (ctxt == NULL) {
        xmlFreeParserInputBuffer(input);
        return (NULL);
    }
    stream = xmlNewIOInputStream(ctxt, input, XML_CHAR_ENCODING_NONE);
    if (stream == NULL) {
        xmlFreeParserInputBuffer(input);
        xmlFreeParserCtxt(ctxt);
        return (NULL);
    }
    inputPush(ctxt, stream);
    return (xmlDoRead(ctxt, URL, encoding, options, 0));
}

/**
 * xmlCtxtReadDoc:
 * @ctxt:  an XML parser context
 * @cur:  a pointer to a zero terminated string
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML in-memory document and build a tree.
 * This reuses the existing @ctxt parser context
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlCtxtReadDoc(xmlParserCtxtPtr ctxt, const xmlChar * cur,
               const char *URL, const char *encoding, int options)
{
    if (cur == NULL)
        return (NULL);
    return (xmlCtxtReadMemory(ctxt, (const char *) cur, xmlStrlen(cur), URL,
                              encoding, options));
}

/**
 * xmlCtxtReadFile:
 * @ctxt:  an XML parser context
 * @filename:  a file or URL
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML file from the filesystem or the network.
 * This reuses the existing @ctxt parser context
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlCtxtReadFile(xmlParserCtxtPtr ctxt, const char *filename,
                const char *encoding, int options)
{
    xmlParserInputPtr stream;

    if (filename == NULL)
        return (NULL);
    if (ctxt == NULL)
        return (NULL);
    xmlInitParser();

    xmlCtxtReset(ctxt);

    stream = xmlLoadExternalEntity(filename, NULL, ctxt);
    if (stream == NULL) {
        return (NULL);
    }
    inputPush(ctxt, stream);
    return (xmlDoRead(ctxt, NULL, encoding, options, 1));
}

/**
 * xmlCtxtReadMemory:
 * @ctxt:  an XML parser context
 * @buffer:  a pointer to a char array
 * @size:  the size of the array
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML in-memory document and build a tree.
 * This reuses the existing @ctxt parser context
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlCtxtReadMemory(xmlParserCtxtPtr ctxt, const char *buffer, int size,
                  const char *URL, const char *encoding, int options)
{
    xmlParserInputBufferPtr input;
    xmlParserInputPtr stream;

    if (ctxt == NULL)
        return (NULL);
    if (buffer == NULL)
        return (NULL);
    xmlInitParser();

    xmlCtxtReset(ctxt);

    input = xmlParserInputBufferCreateMem(buffer, size, XML_CHAR_ENCODING_NONE);
    if (input == NULL) {
        return(NULL);
    }

    stream = xmlNewIOInputStream(ctxt, input, XML_CHAR_ENCODING_NONE);
    if (stream == NULL) {
        xmlFreeParserInputBuffer(input);
        return(NULL);
    }

    inputPush(ctxt, stream);
    return (xmlDoRead(ctxt, URL, encoding, options, 1));
}

/**
 * xmlCtxtReadFd:
 * @ctxt:  an XML parser context
 * @fd:  an open file descriptor
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML from a file descriptor and build a tree.
 * This reuses the existing @ctxt parser context
 * NOTE that the file descriptor will not be closed when the
 *      reader is closed or reset.
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlCtxtReadFd(xmlParserCtxtPtr ctxt, int fd,
              const char *URL, const char *encoding, int options)
{
    xmlParserInputBufferPtr input;
    xmlParserInputPtr stream;

    if (fd < 0)
        return (NULL);
    if (ctxt == NULL)
        return (NULL);
    xmlInitParser();

    xmlCtxtReset(ctxt);


    input = xmlParserInputBufferCreateFd(fd, XML_CHAR_ENCODING_NONE);
    if (input == NULL)
        return (NULL);
    input->closecallback = NULL;
    stream = xmlNewIOInputStream(ctxt, input, XML_CHAR_ENCODING_NONE);
    if (stream == NULL) {
        xmlFreeParserInputBuffer(input);
        return (NULL);
    }
    inputPush(ctxt, stream);
    return (xmlDoRead(ctxt, URL, encoding, options, 1));
}

/**
 * xmlCtxtReadIO:
 * @ctxt:  an XML parser context
 * @ioread:  an I/O read function
 * @ioclose:  an I/O close function
 * @ioctx:  an I/O handler
 * @URL:  the base URL to use for the document
 * @encoding:  the document encoding, or NULL
 * @options:  a combination of xmlParserOption
 *
 * parse an XML document from I/O functions and source and build a tree.
 * This reuses the existing @ctxt parser context
 *
 * Returns the resulting document tree
 */
xmlDocPtr
xmlCtxtReadIO(xmlParserCtxtPtr ctxt, xmlInputReadCallback ioread,
              xmlInputCloseCallback ioclose, void *ioctx,
              const char *URL,
              const char *encoding, int options)
{
    xmlParserInputBufferPtr input;
    xmlParserInputPtr stream;

    if (ioread == NULL)
        return (NULL);
    if (ctxt == NULL)
        return (NULL);
    xmlInitParser();

    xmlCtxtReset(ctxt);

    input = xmlParserInputBufferCreateIO(ioread, ioclose, ioctx,
                                         XML_CHAR_ENCODING_NONE);
    if (input == NULL) {
        if (ioclose != NULL)
            ioclose(ioctx);
        return (NULL);
    }
    stream = xmlNewIOInputStream(ctxt, input, XML_CHAR_ENCODING_NONE);
    if (stream == NULL) {
        xmlFreeParserInputBuffer(input);
        return (NULL);
    }
    inputPush(ctxt, stream);
    return (xmlDoRead(ctxt, URL, encoding, options, 1));
}