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
  88         if (ctx->cur)
  89                 xsltFreeStylesheet(ctx->cur);
  90
  91         ctx->cur = xsltParseStylesheetFile((const xmlChar *)stylesheet_path);
  92         if (!ctx->cur) {
  93                 fprintf(stderr, "Cannot create XSLT context!\n");
  94                 goto exit;
  95         }
  96
  97         result = 0;
  98 exit:
  99         return result;
 100 }
 101
 102 int xslt_transform(struct xslt_resources *ctx, const char *document)
 103 {
 104         int result = -1;
 105         if (!ctx || !document)
 106                 goto exit;
 107
 108         if (ctx->doc)
 109                 xmlFreeDoc(ctx->doc);
 110         if (ctx->output)
 111                 xmlFreeDoc(ctx->output);
 112         ctx->output = NULL;
 113
 114         ctx->doc = xmlReadMemory(document, strlen(document), "noname.xml",
 115                                  NULL, 0);
 116         if (!ctx->doc) {
 117                 fprintf(stderr, "Cannot create document with "
 118                         "entry!\n");
 119                 goto cleanup;
 120         }
 121
 122         ctx->output = xsltApplyStylesheet(ctx->cur, ctx->doc, NULL);
 123         if (!ctx->output) {
 124                 fprintf(stderr, "Cannot create document with "
 125                         "output!\n");
 126                 goto cleanup;
 127         }
 128
 129         if (ctx->xml_str) {
 130                 xmlFree(ctx->xml_str);
 131                 ctx->xml_str = NULL;
 132         }
 133         xmlDocDumpMemory(ctx->output, &(ctx->xml_str), &(ctx->length));
 134
 135         result = 0;
 136
 137 cleanup:
 138         if (ctx->doc)
 139                 xmlFreeDoc(ctx->doc);
 140         ctx->doc = NULL;
 141
 142         if (ctx->output)
 143                 xmlFreeDoc(ctx->output);
 144         ctx->output = NULL;
 145 exit:
 146
 147         return result;
 148 }
 149
 150 void xslt_delete(struct xslt_resources *ctx)
 151 {
 152         if (!ctx)
 153                 return;
 154
 155         if (ctx->doc)
 156                 xmlFreeDoc(ctx->doc);
 157         if (ctx->output)
 158                 xmlFreeDoc(ctx->output);
 159         if (ctx->xml_str)
 160                 xmlFree(ctx->xml_str);
 161
 162         xsltFreeStylesheet(ctx->cur);
 163         xsltCleanupGlobals();
 164         xmlCleanupParser();
 165
 166         free(ctx);
 167 }
 168
 169 #endif