/***************************************************************************** * libxml.c: XML parser using libxml2 ***************************************************************************** * Copyright (C) 2004 VLC authors and VideoLAN * $Id$ * * Authors: Gildas Bazin * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #include /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open ( vlc_object_t * ); static void Close( vlc_object_t * ); static int ReaderOpen( vlc_object_t * ); static void ReaderClose( vlc_object_t * ); vlc_module_begin () set_description( N_("XML Parser (using libxml2)") ) set_capability( "xml", 10 ) set_callbacks( Open, Close ) #ifdef _WIN32 cannot_unload_broken_library() #endif add_submodule() set_capability( "xml reader", 10 ) set_callbacks( ReaderOpen, ReaderClose ) vlc_module_end () static int ReaderNextNode( xml_reader_t *, const char ** ); static const char *ReaderNextAttr( xml_reader_t *, const char ** ); static int ReaderIsEmptyElement( xml_reader_t *); static int ReaderUseDTD ( xml_reader_t * ); static void CatalogLoad( xml_t *, const char * ); static void CatalogAdd( xml_t *, const char *, const char *, const char * ); static int StreamRead( void *p_context, char *p_buffer, int i_buffer ); static vlc_mutex_t lock = VLC_STATIC_MUTEX; /***************************************************************************** * Module initialization *****************************************************************************/ static int Open( vlc_object_t *p_this ) { xml_t *p_xml = (xml_t *)p_this; if( !xmlHasFeature( XML_WITH_THREAD ) ) return VLC_EGENERIC; vlc_mutex_lock( &lock ); xmlInitParser(); vlc_mutex_unlock( &lock ); 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 ) { #ifdef LIBXML_GETS_A_CLUE_ABOUT_REENTRANCY_AND_MEMORY_LEAKS vlc_mutex_lock( &lock ); xmlCleanupParser(); vlc_mutex_unlock( &lock ); #endif VLC_UNUSED(p_this); return; } /***************************************************************************** * Catalogue functions *****************************************************************************/ static void CatalogLoad( xml_t *p_xml, const char *psz_filename ) { VLC_UNUSED(p_xml); 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 ) { VLC_UNUSED(p_xml); xmlCatalogAdd( (unsigned char*)psz_arg1, (unsigned char*)psz_arg2, (unsigned char*)psz_filename ); } /***************************************************************************** * Reader functions *****************************************************************************/ static void ReaderErrorHandler( void *p_arg, const char *p_msg, xmlParserSeverities severity, xmlTextReaderLocatorPtr locator) { VLC_UNUSED(severity); xml_reader_t *p_reader = (xml_reader_t *)p_arg; int line = xmlTextReaderLocatorLineNumber( locator ); msg_Err( p_reader, "XML parser error (line %d) : %s", line, p_msg ); } struct xml_reader_sys_t { xmlTextReaderPtr xml; char *node; }; static int ReaderOpen( vlc_object_t *p_this ) { if( !xmlHasFeature( XML_WITH_THREAD ) ) return VLC_EGENERIC; xml_reader_t *p_reader = (xml_reader_t *)p_this; xml_reader_sys_t *p_sys = malloc( sizeof( *p_sys ) ); xmlTextReaderPtr p_libxml_reader; if( unlikely(!p_sys) ) return VLC_ENOMEM; vlc_mutex_lock( &lock ); xmlInitParser(); vlc_mutex_unlock( &lock ); p_libxml_reader = xmlReaderForIO( StreamRead, NULL, p_reader->p_stream, NULL, NULL, 0 ); if( !p_libxml_reader ) { free( p_sys ); return VLC_ENOMEM; } /* Set the error handler */ xmlTextReaderSetErrorHandler( p_libxml_reader, ReaderErrorHandler, p_reader ); p_sys->xml = p_libxml_reader; p_sys->node = NULL; p_reader->p_sys = p_sys; p_reader->pf_next_node = ReaderNextNode; p_reader->pf_next_attr = ReaderNextAttr; p_reader->pf_is_empty = ReaderIsEmptyElement; p_reader->pf_use_dtd = ReaderUseDTD; return VLC_SUCCESS; } static void ReaderClose( vlc_object_t *p_this ) { xml_reader_t *p_reader = (xml_reader_t *)p_this; xml_reader_sys_t *p_sys = p_reader->p_sys; xmlFreeTextReader( p_sys->xml ); #ifdef LIBXML_GETS_A_CLUE_ABOUT_REENTRANCY_AND_MEMORY_LEAKS vlc_mutex_lock( &lock ); xmlCleanupParser(); vlc_mutex_unlock( &lock ); #endif free( p_sys->node ); free( p_sys ); } static int ReaderUseDTD ( xml_reader_t *p_reader ) { /* Activate DTD validation */ xmlTextReaderSetParserProp( p_reader->p_sys->xml, XML_PARSER_DEFAULTATTRS, true ); xmlTextReaderSetParserProp( p_reader->p_sys->xml, XML_PARSER_VALIDATE, true ); return VLC_SUCCESS; } static int ReaderNextNode( xml_reader_t *p_reader, const char **pval ) { xml_reader_sys_t *p_sys = p_reader->p_sys; const xmlChar *node; int ret; free( p_sys->node ); p_sys->node = NULL; skip: switch( xmlTextReaderRead( p_sys->xml ) ) { case 0: /* EOF */ return XML_READER_NONE; case -1: /* error */ return XML_READER_ERROR; } switch( xmlTextReaderNodeType( p_sys->xml ) ) { case XML_READER_TYPE_ELEMENT: node = xmlTextReaderConstName( p_sys->xml ); ret = XML_READER_STARTELEM; break; case XML_READER_TYPE_END_ELEMENT: node = xmlTextReaderConstName( p_sys->xml ); ret = XML_READER_ENDELEM; break; case XML_READER_TYPE_CDATA: case XML_READER_TYPE_TEXT: node = xmlTextReaderConstValue( p_sys->xml ); ret = XML_READER_TEXT; break; case -1: return XML_READER_ERROR; default: goto skip; } if( unlikely(node == NULL) ) return XML_READER_ERROR; p_sys->node = strdup( (const char *)node ); if( pval != NULL ) *pval = p_sys->node; return likely(p_sys->node != NULL) ? ret : XML_READER_ERROR; } #if 0 static char *ReaderValue( xml_reader_t *p_reader ) { const xmlChar *psz_value = xmlTextReaderConstValue( p_reader->p_sys->xml ); return psz_value ? strdup( (const char *)psz_value ) : NULL; } #endif static const char *ReaderNextAttr( xml_reader_t *p_reader, const char **pval ) { xmlTextReaderPtr xml = p_reader->p_sys->xml; const xmlChar *name, *value; if( xmlTextReaderMoveToNextAttribute( xml ) != 1 || (name = xmlTextReaderConstName( xml )) == NULL || (value = xmlTextReaderConstValue( xml )) == NULL ) return NULL; *pval = (const char *)value; return (const char *)name; } static int StreamRead( void *p_context, char *p_buffer, int i_buffer ) { stream_t *s = (stream_t*)p_context; return vlc_stream_Read( s, p_buffer, i_buffer ); } static int ReaderIsEmptyElement( xml_reader_t *p_reader ) { return xmlTextReaderIsEmptyElement( p_reader->p_sys->xml ); }