parser/expat/lib/moz_extensions.c

   1 /* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifdef IS_LITTLE_ENDIAN
   7
   8 #define PREFIX(ident) little2_ ## ident
   9 #define BYTE_TYPE(p) LITTLE2_BYTE_TYPE(XmlGetUtf16InternalEncodingNS(), p)
  10 #define IS_NAME_CHAR_MINBPC(p) LITTLE2_IS_NAME_CHAR_MINBPC(0, p)
  11 #define IS_NMSTRT_CHAR_MINBPC(p) LITTLE2_IS_NMSTRT_CHAR_MINBPC(0, p)
  12
  13 #else
  14
  15 #define PREFIX(ident) big2_ ## ident
  16 #define BYTE_TYPE(p) BIG2_BYTE_TYPE(XmlGetUtf16InternalEncodingNS(), p)
  17 #define IS_NAME_CHAR_MINBPC(p) BIG2_IS_NAME_CHAR_MINBPC(0, p)
  18 #define IS_NMSTRT_CHAR_MINBPC(p) BIG2_IS_NMSTRT_CHAR_MINBPC(0, p)
  19
  20 #endif
  21
  22 #define MOZ_EXPAT_VALID_QNAME       (0)
  23 #define MOZ_EXPAT_EMPTY_QNAME       (1 << 0)
  24 #define MOZ_EXPAT_INVALID_CHARACTER (1 << 1)
  25 #define MOZ_EXPAT_MALFORMED         (1 << 2)
  26
  27 int MOZ_XMLCheckQName(const char* ptr, const char* end, int ns_aware,
  28                       const char** colon)
  29 {
  30   int result = MOZ_EXPAT_VALID_QNAME;
  31   int nmstrt = 1;
  32   *colon = 0;
  33   if (ptr == end) {
  34     return MOZ_EXPAT_EMPTY_QNAME;
  35   }
  36   do {
  37     switch (BYTE_TYPE(ptr)) {
  38     case BT_COLON:
  39        /* We're namespace-aware and either first or last character is a colon
  40           or we've already seen a colon. */
  41       if (ns_aware && (nmstrt || *colon || ptr + 2 == end)) {
  42         return MOZ_EXPAT_MALFORMED;
  43       }
  44       *colon = ptr;
  45       nmstrt = ns_aware; /* e.g. "a:0" should be valid if !ns_aware */
  46       break;
  47     case BT_NONASCII:
  48       if (nmstrt && !IS_NMSTRT_CHAR_MINBPC(ptr)) {
  49         /* If this is a valid name character and we're namespace-aware, the
  50            QName is malformed.  Otherwise, this character's invalid at the
  51            start of a name (or, if we're namespace-aware, at the start of a
  52            localpart). */
  53         return (IS_NAME_CHAR_MINBPC(ptr) && ns_aware) ?
  54                MOZ_EXPAT_MALFORMED :
  55                MOZ_EXPAT_INVALID_CHARACTER;
  56       }
  57       if (!IS_NAME_CHAR_MINBPC(ptr)) {
  58         return MOZ_EXPAT_INVALID_CHARACTER;
  59       }
  60       nmstrt = 0;
  61       break;
  62     case BT_NMSTRT:
  63     case BT_HEX:
  64       nmstrt = 0;
  65       break;
  66     case BT_DIGIT:
  67     case BT_NAME:
  68     case BT_MINUS:
  69       if (nmstrt) {
  70         return MOZ_EXPAT_INVALID_CHARACTER;
  71       }
  72       break;
  73     default:
  74       return MOZ_EXPAT_INVALID_CHARACTER;
  75     }
  76     ptr += 2;
  77   } while (ptr != end);
  78   return result;
  79 }
  80
  81 int MOZ_XMLIsLetter(const char* ptr)
  82 {
  83   switch (BYTE_TYPE(ptr)) {
  84   case BT_NONASCII:
  85     if (!IS_NMSTRT_CHAR_MINBPC(ptr)) {
  86       return 0;
  87     }
  88     /* fall through */
  89   case BT_NMSTRT:
  90   case BT_HEX:
  91     return 1;
  92   default:
  93     return 0;
  94   }
  95 }
  96
  97 int MOZ_XMLIsNCNameChar(const char* ptr)
  98 {
  99   switch (BYTE_TYPE(ptr)) {
 100   case BT_NONASCII:
 101     if (!IS_NAME_CHAR_MINBPC(ptr)) {
 102       return 0;
 103     }
 104     /* fall through */
 105   case BT_NMSTRT:
 106   case BT_HEX:
 107   case BT_DIGIT:
 108   case BT_NAME:
 109   case BT_MINUS:
 110     return 1;
 111   default:
 112     return 0;
 113   }
 114 }
 115
 116 int MOZ_XMLTranslateEntity(const char* ptr, const char* end, const char** next,
 117                            XML_Char* result)
 118 {
 119   const ENCODING* enc = XmlGetUtf16InternalEncodingNS();
 120   int tok = PREFIX(scanRef)(enc, ptr, end, next);
 121   if (tok <= XML_TOK_INVALID) {
 122     return 0;
 123   }
 124
 125   if (tok == XML_TOK_CHAR_REF) {
 126     int n = XmlCharRefNumber(enc, ptr);
 127
 128     /* We could get away with just < 0, but better safe than sorry. */
 129     if (n <= 0) {
 130       return 0;
 131     }
 132
 133     return XmlUtf16Encode(n, (unsigned short*)result);
 134   }
 135
 136   if (tok == XML_TOK_ENTITY_REF) {
 137     /* *next points to after the semicolon, so the entity ends at
 138        *next - enc->minBytesPerChar. */
 139     XML_Char ch =
 140       (XML_Char)XmlPredefinedEntityName(enc, ptr, *next - enc->minBytesPerChar);
 141     if (!ch) {
 142       return 0;
 143     }
 144
 145     *result = ch;
 146     return 1;
 147   }
 148
 149   return 0;
 150 }
 151
 152 #undef PREFIX
 153 #undef BYTE_TYPE
 154 #undef IS_NAME_CHAR_MINBPC
 155 #undef IS_NMSTRT_CHAR_MINBPC