425 lines
11 KiB
C
425 lines
11 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2006 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include "transmission.h"
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/* http://www.w3.org/TR/2004/REC-xml-20040204/ */
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#define WS( cc ) \
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( ' ' == (cc) || '\t' == (cc) || '\n' == (cc) || '\r' == (cc) )
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#define TAGBEGIN '<'
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#define TAGEND '>'
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#define TAGCLOSE '/'
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#define NAMESPACESEP ':'
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#define SQUOTEC '\''
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#define DQUOTEC '"'
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#define SQUOTES "'"
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#define DQUOTES "\""
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#define COMMENTBEGIN "<!--"
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#define COMMENTEND "-->"
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#define PROCINSTBEGIN "<?"
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#define PROCINSTEND "?>"
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#define CDATABEGIN "<![CDATA["
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#define CDATAEND "]]>"
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#define BANGBEGIN "<!"
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#define BANGEND ">"
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#define CHECKNULL( bb, ee, rr ) \
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{ if( NULL == (bb) || (ee) <= (bb) ) return (rr); }
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#define justskip( bb, ee, ap, ot, ct ) \
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( skipthingy( (bb), (ee), (ap), (ot), (ct), NULL, NULL ) )
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static char *
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catrange( char * str, const char * begin, const char * end );
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static int
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skipall( const char * begin, const char * end, const char ** afterpos );
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static int
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nexttag( const char * begin, const char * end, const char ** tagpos );
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static int
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overtag( const char * begin, const char * end, const char ** overpos );
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static int
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tagname( const char * begin, const char * end,
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const char ** tagstart, const char ** namestart, int * namelen );
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static int
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skipthingy( const char * begin, const char * end, const char ** afterpos,
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const char * openthingy, const char * closethingy,
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const char ** databegin, const char ** dataend );
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/* XXX check document charset, in http headers and/or <?xml> tag */
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const char *
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tr_xmlFindTag( const char * begin, const char * end, const char * tag )
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{
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const char * name;
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int len;
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CHECKNULL( begin, end, NULL );
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while( tagname( begin, end, &begin, &name, &len ) )
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{
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assert( NULL != begin && NULL != name && 0 < len );
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if( 0 == tr_strncasecmp( tag, name, len ) )
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{
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return begin;
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}
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begin = tr_xmlSkipTag( begin, end );
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}
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return NULL;
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}
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const char *
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tr_xmlTagName( const char * begin, const char * end, int * len )
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{
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CHECKNULL( begin, end, NULL );
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if( tagname( begin, end, NULL, &begin, len ) )
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{
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return begin;
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}
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return NULL;
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}
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const char *
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tr_xmlTagContents( const char * begin, const char * end )
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{
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CHECKNULL( begin, end, NULL );
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if( nexttag( begin, end, &begin ) && overtag( begin, end, &begin ) )
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{
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begin = NULL;
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}
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return begin;
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}
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int
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tr_xmlVerifyContents( const char * begin, const char * end, const char * data,
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int ignorecase )
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{
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int len;
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CHECKNULL( begin, end, 1 );
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len = strlen( data );
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while( end > begin && WS( *begin ) )
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{
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begin++;
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}
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if( end - begin > len )
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{
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if( ignorecase )
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{
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return ( 0 != tr_strncasecmp( begin, data, len ) );
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}
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else
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{
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return ( 0 != memcmp( begin, data, len ) );
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}
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}
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return 1;
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}
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const char *
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tr_xmlSkipTag( const char * begin, const char * end )
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{
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CHECKNULL( begin, end, NULL );
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if( nexttag( begin, end, &begin ) )
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{
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if( overtag( begin, end, &begin ) )
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{
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return begin;
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}
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while( NULL != begin )
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{
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if( nexttag( begin, end, &begin ) )
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{
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begin = tr_xmlSkipTag( begin, end );
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}
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else
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{
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overtag( begin, end, &begin );
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return begin;
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}
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}
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}
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return NULL;
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}
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char *
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tr_xmlDupContents( const char * begin, const char * end )
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{
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const char * ii, * cbegin, * cend;
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char * ret;
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int len;
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CHECKNULL( begin, end, NULL );
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ret = NULL;
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len = strlen( CDATABEGIN );
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while( end > begin )
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{
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ii = memchr( begin, TAGBEGIN, end - begin );
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if( NULL == ii )
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{
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free( ret );
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return NULL;
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}
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/* XXX expand entity references and such here */
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ret = catrange( ret, begin, ii );
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if( NULL == ret )
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{
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return NULL;
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}
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if( !skipthingy( ii, end, &begin, CDATABEGIN, CDATAEND,
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&cbegin, &cend ) )
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{
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ret = catrange( ret, cbegin, cend );
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if( NULL == ret )
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{
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return NULL;
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}
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}
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else if( skipall( ii, end, &begin ) )
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{
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if( end > ii + 1 && TAGCLOSE == ii[1] )
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{
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return ret;
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}
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begin = tr_xmlSkipTag( ii, end );
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}
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}
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free( ret );
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return NULL;
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}
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static char *
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catrange( char * str, const char * begin, const char * end )
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{
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int len;
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char * ret;
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if( NULL == str )
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{
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return tr_dupstr( begin, end - begin );
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}
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len = strlen( str );
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ret = realloc( str, len + end - begin + 1 );
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if( NULL == ret )
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{
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free( str );
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return NULL;
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}
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memcpy( ret + len, begin, end - begin );
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ret[len + end - begin] = '\0';
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return ret;
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}
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static int
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skipall( const char * begin, const char * end, const char ** afterpos )
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{
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return ( justskip( begin, end, afterpos, COMMENTBEGIN, COMMENTEND ) &&
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justskip( begin, end, afterpos, CDATABEGIN, CDATAEND ) &&
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justskip( begin, end, afterpos, PROCINSTBEGIN, PROCINSTEND ) &&
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justskip( begin, end, afterpos, BANGBEGIN, BANGEND ) );
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}
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/* returns true if a tag was found and it's a start or empty element tag */
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static int
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nexttag( const char * begin, const char * end, const char ** tagpos )
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{
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CHECKNULL( begin, end, 0 );
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while( end > begin )
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{
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begin = memchr( begin, TAGBEGIN, end - begin );
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CHECKNULL( begin, end, 0 );
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if( justskip( begin, end, &begin, COMMENTBEGIN, COMMENTEND ) &&
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justskip( begin, end, &begin, CDATABEGIN, CDATAEND ) &&
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justskip( begin, end, &begin, PROCINSTBEGIN, PROCINSTEND ) &&
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justskip( begin, end, &begin, BANGBEGIN, BANGEND ) )
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{
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*tagpos = begin;
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begin++;
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if( end > begin )
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{
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return ( TAGCLOSE != *begin );
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}
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break;
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}
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}
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*tagpos = NULL;
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return 0;
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}
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/* returns true if the tag is an empty element such as <foo/> */
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static int
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overtag( const char * begin, const char * end, const char ** overpos )
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{
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const char * ii;
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assert( NULL != begin && end > begin && TAGBEGIN == *begin );
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ii = begin + 1;
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while( end > ii )
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{
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switch( *ii )
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{
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case DQUOTEC:
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justskip( ii, end, &ii, DQUOTES, DQUOTES );
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break;
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case SQUOTEC:
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justskip( ii, end, &ii, SQUOTES, SQUOTES );
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break;
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case TAGEND:
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*overpos = ii + 1;
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for( ii--; begin < ii; ii-- )
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{
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if( TAGCLOSE == *ii )
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{
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return 1;
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}
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if( !WS( *ii ) )
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{
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break;
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}
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}
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return 0;
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default:
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ii++;
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break;
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}
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}
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*overpos = NULL;
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return 0;
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}
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static int
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tagname( const char * begin, const char * end,
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const char ** tagstart, const char ** namestart, int * namelen )
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{
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const char * name, * ii;
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CHECKNULL( begin, end, 0 );
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if( nexttag( begin, end, &begin ) )
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{
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assert( NULL != begin && TAGBEGIN == *begin );
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ii = begin + 1;
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while( end > ii && WS( *ii ) )
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{
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ii++;
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}
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name = ii;
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while( end > ii && TAGEND != *ii && !WS( *ii ) )
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{
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if( NAMESPACESEP == *ii )
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{
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name = ii + 1;
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}
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ii++;
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}
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if( end > ii && ii > name )
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{
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if( NULL != tagstart )
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{
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*tagstart = begin;
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}
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if( NULL != namestart )
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{
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*namestart = name;
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}
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if( NULL != namelen )
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{
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*namelen = ii - name;
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}
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return 1;
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}
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}
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return 0;
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}
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static int
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skipthingy( const char * begin, const char * end, const char ** afterpos,
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const char * openthingy, const char * closethingy,
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const char ** databegin, const char ** dataend )
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{
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int len;
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CHECKNULL( begin, end, 1 );
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len = strlen( openthingy );
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if( 0 != memcmp( begin, openthingy, MIN( end - begin, len ) ) )
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{
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return 1;
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}
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if( NULL != afterpos )
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{
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*afterpos = NULL;
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}
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if( NULL != databegin )
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{
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*databegin = NULL;
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}
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if( NULL != dataend )
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{
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*dataend = NULL;
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}
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if( end - begin <= len )
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{
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return 0;
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}
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begin += len;
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if( NULL != databegin )
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{
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*databegin = begin;
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}
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len = strlen( closethingy );
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begin = tr_memmem( begin, end - begin, closethingy, len );
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if( NULL != dataend )
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{
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*dataend = begin;
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}
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if( NULL != afterpos && NULL != begin )
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{
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*afterpos = ( begin + len >= end ? NULL : begin + len );
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}
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return 0;
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}
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