src/xslt_aux.h

   1 /*
   2   Copyright (c) 2008 Instituto Nokia de Tecnologia
   3   All rights reserved.
   4
   5   Redistribution and use in source and binary forms, with or without modification,
   6   are permitted provided that the following conditions are met:
   7
   8   * Redistributions of source code must retain the above copyright notice,
   9   this list of conditions and the following disclaimer.
  10   * Redistributions in binary form must reproduce the above copyright notice,
  11   this list of conditions and the following disclaimer in the documentation
  12   and/or other materials provided with the distribution.
  13   * Neither the name of the INdT nor the names of its contributors
  14   may be used to endorse or promote products derived from this software
  15   without specific prior written permission.
  16
  17   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  18   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  21   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27   POSSIBILITY OF SUCH DAMAGE.
  28 */
  29 /**
  30  * @file   xslt_aux.h
  31  * @author Adenilson Cavalcanti da Silva <adenilson.silva@indt.org.br>
  32  * @date   Mon Aug 25 15:50:20 2008
  33  *
  34  * @brief  A XSLT helper module, converts a XML doc to another format
  35  * using a xslt file.
  36  *
  37  * Depends on libxml and libxslt.
  38  *
  39  * \todo:
  40  * - doxygen comments about use
  41  * - move code to a '.c' file or make functions static
  42  * - make 'xslt_resources' an abstract type
  43  *
  44  */
  45
  46 #ifndef __XSLT_AUX__
  47 #define __XSLT_AUX__
  48
  49 #include <libxml/HTMLtree.h>
  50 #include <libxml/catalog.h>
  51 #include <libxml/debugXML.h>
  52 #include <libxml/xinclude.h>
  53 #include <libxml/xmlIO.h>
  54 #include <libxml/xmlmemory.h>
  55 #include <libxslt/transform.h>
  56 #include <libxslt/xslt.h>
  57 #include <libxslt/xsltInternals.h>
  58 #include <libxslt/xsltutils.h>
  59 #include <string.h>
  60
  61 struct xslt_resources {
  62         xmlDocPtr output;
  63         xmlDocPtr doc;
  64         xsltStylesheetPtr cur;
  65         xmlChar *xml_str;
  66         int length;
  67 };
  68
  69 struct xslt_resources *xslt_new(void)
  70 {
  71         struct xslt_resources *result;
  72         result = (struct xslt_resources *)malloc(sizeof(struct xslt_resources));
  73         if (result)
  74                 memset(result, 0, sizeof(struct xslt_resources));
  75
  76         return result;
  77 }
  78
  79 int xslt_initialize(struct xslt_resources *ctx, const char *stylesheet_path)
  80 {
  81         int result = -1;
  82         if (!stylesheet_path || !ctx)
  83                 goto exit;
  84
  85         xmlSubstituteEntitiesDefault(1);
  86         xmlLoadExtDtdDefaultValue = 1;
  87         ctx->cur = xsltParseStylesheetFile((const xmlChar *)stylesheet_path);
  88         if (!ctx->cur) {
  89                 fprintf(stderr, "Cannot create XSLT context!\n");
  90                 goto exit;
  91         }
  92
  93         result = 0;
  94 exit:
  95         return result;
  96 }
  97
  98 int xslt_transform(struct xslt_resources *ctx, const char *document)
  99 {
 100         int result = -1;
 101         if (!ctx || !document)
 102                 goto exit;
 103
 104         if (ctx->doc)
 105                 xmlFreeDoc(ctx->doc);
 106         if (ctx->output)
 107                 xmlFreeDoc(ctx->output);
 108         ctx->output = NULL;
 109
 110         ctx->doc = xmlReadMemory(document, strlen(document), "noname.xml",
 111                                  NULL, 0);
 112         if (!ctx->doc) {
 113                 fprintf(stderr, "Cannot create document with "
 114                         "entry!\n");
 115                 goto cleanup;
 116         }
 117
 118         ctx->output = xsltApplyStylesheet(ctx->cur, ctx->doc, NULL);
 119         if (!ctx->output) {
 120                 fprintf(stderr, "Cannot create document with "
 121                         "output!\n");
 122                 goto cleanup;
 123         }
 124
 125         if (ctx->xml_str) {
 126                 xmlFree(ctx->xml_str);
 127                 ctx->xml_str = NULL;
 128         }
 129         xmlDocDumpMemory(ctx->output, &(ctx->xml_str), &(ctx->length));
 130
 131         result = 0;
 132
 133 cleanup:
 134         if (ctx->doc)
 135                 xmlFreeDoc(ctx->doc);
 136         ctx->doc = NULL;
 137
 138         if (ctx->output)
 139                 xmlFreeDoc(ctx->output);
 140         ctx->output = NULL;
 141 exit:
 142
 143         return result;
 144 }
 145
 146 void xslt_delete(struct xslt_resources *ctx)
 147 {
 148         if (!ctx)
 149                 return;
 150
 151         if (ctx->doc)
 152                 xmlFreeDoc(ctx->doc);
 153         if (ctx->output)
 154                 xmlFreeDoc(ctx->output);
 155         if (ctx->xml_str)
 156                 xmlFree(ctx->xml_str);
 157
 158         xsltFreeStylesheet(ctx->cur);
 159         xsltCleanupGlobals();
 160         xmlCleanupParser();
 161
 162         free(ctx);
 163 }
 164
 165 #endif