/***************************************************************************** * libxml.c: XML parser using libxml2 ***************************************************************************** * Copyright (C) 2004 VideoLAN * $Id$ * * Authors: Gildas Bazin * * 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 #include #include "vlc_block.h" #include "vlc_stream.h" #include "vlc_xml.h" #include #include /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open ( vlc_object_t * ); static void Close( vlc_object_t * ); vlc_module_begin(); set_category( CAT_ADVANCED ); set_subcategory( SUBCAT_ADVANCED_XML ); 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; }; static xml_reader_t *ReaderCreate( xml_t *, stream_t * ); 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 * ); static int ReaderUseDTD ( xml_reader_t *, vlc_bool_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 ); /***************************************************************************** * 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 ); } static xml_reader_t *ReaderCreate( xml_t *p_xml, stream_t *p_stream ) { xml_reader_t *p_reader; xml_reader_sys_t *p_sys; xmlTextReaderPtr p_libxml_reader; xmlParserInputBufferPtr p_read_context; p_read_context = malloc( sizeof( xmlParserInputBuffer ) ); p_libxml_reader = xmlReaderForIO( StreamRead, NULL, p_stream, NULL, NULL, 0 ); if( !p_libxml_reader ) { msg_Err( p_xml, "failed to create xml parser" ); 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; p_reader->pf_use_dtd = ReaderUseDTD; 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 ); } 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; } 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; 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; } 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 ); }