libxml.c 7.24 KB
Newer Older
Gildas Bazin's avatar
Gildas Bazin committed
1 2 3
/*****************************************************************************
 * libxml.c: XML parser using libxml2
 *****************************************************************************
4
 * Copyright (C) 2004 the VideoLAN team
Gildas Bazin's avatar
Gildas Bazin committed
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
 * $Id$
 *
 * Authors: Gildas Bazin <gbazin@videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <stdlib.h>
#include <vlc/vlc.h>

27 28
#include "vlc_block.h"
#include "vlc_stream.h"
Gildas Bazin's avatar
Gildas Bazin committed
29 30 31 32 33 34 35 36 37 38 39 40
#include "vlc_xml.h"

#include <libxml/xmlreader.h>
#include <libxml/catalog.h>

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

vlc_module_begin();
41 42
    set_category( CAT_ADVANCED );
    set_subcategory( SUBCAT_ADVANCED_XML );
Gildas Bazin's avatar
Gildas Bazin committed
43 44 45 46 47 48 49 50 51 52 53
    set_description( _("XML Parser (using libxml2)") );
    set_capability( "xml", 10 );
    set_callbacks( Open, Close );
vlc_module_end();

struct xml_reader_sys_t
{
    /* libxml2 reader context */
    xmlTextReaderPtr p_reader;
};

54
static xml_reader_t *ReaderCreate( xml_t *, stream_t * );
Gildas Bazin's avatar
Gildas Bazin committed
55 56 57 58 59 60 61
static void ReaderDelete( xml_reader_t * );
static int ReaderRead( xml_reader_t * );
static int ReaderNodeType( xml_reader_t * );
static char *ReaderName( xml_reader_t * );
static char *ReaderValue( xml_reader_t * );
static int ReaderNextAttr( xml_reader_t * );

62 63
static int ReaderUseDTD ( xml_reader_t *, vlc_bool_t );

Gildas Bazin's avatar
Gildas Bazin committed
64 65
static void CatalogLoad( xml_t *, const char * );
static void CatalogAdd( xml_t *, const char *, const char *, const char * );
66
static int StreamRead( void *p_context, char *p_buffer, int i_buffer );
Gildas Bazin's avatar
Gildas Bazin committed
67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118

/*****************************************************************************
 * Module initialization
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    xml_t *p_xml = (xml_t *)p_this;

    p_xml->pf_reader_create = ReaderCreate;
    p_xml->pf_reader_delete = ReaderDelete;

    p_xml->pf_catalog_load = CatalogLoad;
    p_xml->pf_catalog_add  = CatalogAdd;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Module deinitialization
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    return;
}

/*****************************************************************************
 * Catalogue functions
 *****************************************************************************/
static void CatalogLoad( xml_t *p_xml, const char *psz_filename )
{
    if( !psz_filename ) xmlInitializeCatalog();
    else xmlLoadCatalog( psz_filename );
}

static void CatalogAdd( xml_t *p_xml, const char *psz_arg1,
                          const char *psz_arg2, const char *psz_filename )
{
    xmlCatalogAdd( psz_arg1, psz_arg2, psz_filename );
}

/*****************************************************************************
 * Reader functions
 *****************************************************************************/
static void ReaderErrorHandler( void *p_arg, const char *p_msg,
                                xmlParserSeverities severity,
                                xmlTextReaderLocatorPtr locator)
{
    xml_reader_t *p_reader = (xml_reader_t *)p_arg;
    int line = xmlTextReaderLocatorLineNumber( locator );
    msg_Err( p_reader->p_xml, "XML parser error (line %d) : %s", line, p_msg );
}

119
static xml_reader_t *ReaderCreate( xml_t *p_xml, stream_t *p_stream )
Gildas Bazin's avatar
Gildas Bazin committed
120 121 122 123
{
    xml_reader_t *p_reader;
    xml_reader_sys_t *p_sys;
    xmlTextReaderPtr p_libxml_reader;
124
    xmlParserInputBufferPtr p_read_context;
Gildas Bazin's avatar
Gildas Bazin committed
125

126 127 128 129
    p_read_context = malloc( sizeof( xmlParserInputBuffer ) );

    p_libxml_reader = xmlReaderForIO( StreamRead, NULL, p_stream,
                                      NULL, NULL, 0 );
Gildas Bazin's avatar
Gildas Bazin committed
130 131
    if( !p_libxml_reader )
    {
132
        msg_Err( p_xml, "failed to create xml parser" );
Gildas Bazin's avatar
Gildas Bazin committed
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
        return 0;
    }

    p_reader = malloc( sizeof(xml_reader_t) );
    p_reader->p_sys = p_sys = malloc( sizeof(xml_reader_sys_t) );
    p_reader->p_sys->p_reader = p_libxml_reader;
    p_reader->p_xml = p_xml;

    /* Set the error handler */
    xmlTextReaderSetErrorHandler( p_libxml_reader,
                                  ReaderErrorHandler, p_reader );


    p_reader->pf_read = ReaderRead;
    p_reader->pf_node_type = ReaderNodeType;
    p_reader->pf_name = ReaderName;
    p_reader->pf_value = ReaderValue;
    p_reader->pf_next_attr = ReaderNextAttr;
151
    p_reader->pf_use_dtd = ReaderUseDTD;
Gildas Bazin's avatar
Gildas Bazin committed
152 153 154 155 156 157 158 159 160 161 162

    return p_reader;
}

static void ReaderDelete( xml_reader_t *p_reader )
{
    xmlFreeTextReader( p_reader->p_sys->p_reader );
    free( p_reader->p_sys );
    free( p_reader );
}

163 164 165 166 167 168 169 170 171 172 173
static int ReaderUseDTD ( xml_reader_t *p_reader, vlc_bool_t b_use )
{
    /* Activate DTD validation */
    xmlTextReaderSetParserProp( p_reader->p_sys->p_reader,
                                XML_PARSER_DEFAULTATTRS, b_use );
    xmlTextReaderSetParserProp( p_reader->p_sys->p_reader,
                                XML_PARSER_VALIDATE, b_use );

    return VLC_SUCCESS;
}

Gildas Bazin's avatar
Gildas Bazin committed
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
static int ReaderRead( xml_reader_t *p_reader )
{
    int i_ret = xmlTextReaderRead( p_reader->p_sys->p_reader );

#if 0
    switch( i_ret )
    {
    default:
    }
#endif

    return i_ret;
}

static int ReaderNodeType( xml_reader_t *p_reader )
{
    int i_ret = xmlTextReaderNodeType( p_reader->p_sys->p_reader );

    switch( i_ret )
    {
    case XML_READER_TYPE_ELEMENT:
        i_ret = XML_READER_STARTELEM;
        break;
    case XML_READER_TYPE_END_ELEMENT:
        i_ret = XML_READER_ENDELEM;
        break;
200 201 202
    case XML_READER_TYPE_TEXT:
        i_ret = XML_READER_TEXT;
        break;
Gildas Bazin's avatar
Gildas Bazin committed
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236
    case -1:
        i_ret = -1;
        break;
    default:
        i_ret = XML_READER_NONE;
        break;
    }

    return i_ret;
}

static char *ReaderName( xml_reader_t *p_reader )
{
    const xmlChar *psz_name =
        xmlTextReaderConstName( p_reader->p_sys->p_reader );

    if( psz_name ) return strdup( psz_name );
    else return 0;
}

static char *ReaderValue( xml_reader_t *p_reader )
{
    const xmlChar *psz_value =
        xmlTextReaderConstValue( p_reader->p_sys->p_reader );

    if( psz_value ) return strdup( psz_value );
    else return 0;
}

static int ReaderNextAttr( xml_reader_t *p_reader )
{
    return ( xmlTextReaderMoveToNextAttribute( p_reader->p_sys->p_reader )
             == 1 ) ? VLC_SUCCESS : VLC_EGENERIC;
}
237 238 239 240 241 242

static int StreamRead( void *p_context, char *p_buffer, int i_buffer )
{
    stream_t *s = (stream_t*)p_context;
    return stream_Read( s, p_buffer, i_buffer );    
}