mirror of
https://github.com/transmission/transmission
synced 2024-12-25 17:17:31 +00:00
333 lines
8.2 KiB
C
333 lines
8.2 KiB
C
/******************************************************************************
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* Copyright (c) 2005 Eric Petit
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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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#define LIST_SIZE 20
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#define OUTBUF_SIZE 100
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static int tr_bencSprintf( char ** buf, size_t * used, size_t * max,
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char * format, ... )
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#ifdef __GNUC__
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__attribute__ ((format (printf, 4, 5)))
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#endif
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;
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int _tr_bencLoad( char * buf, size_t len, benc_val_t * val, char ** end )
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{
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char * p, * e, * foo;
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if( 1 >= len )
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{
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return 1;
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}
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if( !end )
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{
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/* So we only have to check once */
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end = &foo;
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}
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val->begin = buf;
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if( buf[0] == 'i' )
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{
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e = memchr( &buf[1], 'e', len - 1 );
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if( NULL == e )
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{
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return 1;
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}
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/* Integer: i1242e */
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val->type = TYPE_INT;
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*e = '\0';
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val->val.i = strtoll( &buf[1], &p, 10 );
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*e = 'e';
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if( p != e )
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{
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return 1;
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}
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val->end = p + 1;
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}
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else if( buf[0] == 'l' || buf[0] == 'd' )
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{
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/* List: l<item1><item2>e
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Dict: d<string1><item1><string2><item2>e
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A dictionary is just a special kind of list with an even
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count of items, and where even items are strings. */
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char * cur;
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char is_dict;
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char str_expected;
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is_dict = ( buf[0] == 'd' );
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val->type = is_dict ? TYPE_DICT : TYPE_LIST;
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val->val.l.alloc = LIST_SIZE;
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val->val.l.count = 0;
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val->val.l.vals = malloc( LIST_SIZE * sizeof( benc_val_t ) );
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cur = &buf[1];
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str_expected = 1;
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while( (size_t)(cur - buf) < len && cur[0] != 'e' )
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{
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if( val->val.l.count == val->val.l.alloc )
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{
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/* We need a bigger boat */
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val->val.l.alloc += LIST_SIZE;
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val->val.l.vals = realloc( val->val.l.vals,
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val->val.l.alloc * sizeof( benc_val_t ) );
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}
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if( tr_bencLoad( cur, len - (cur - buf),
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&val->val.l.vals[val->val.l.count], &p ) )
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{
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return 1;
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}
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if( is_dict && str_expected &&
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val->val.l.vals[val->val.l.count].type != TYPE_STR )
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{
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return 1;
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}
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str_expected = !str_expected;
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val->val.l.count++;
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cur = p;
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}
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if( is_dict && ( val->val.l.count & 1 ) )
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{
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return 1;
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}
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val->end = cur + 1;
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}
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else
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{
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e = memchr( buf, ':', len );
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if( NULL == e )
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{
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return 1;
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}
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/* String: 12:whateverword */
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val->type = TYPE_STR;
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e[0] = '\0';
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val->val.s.i = strtol( buf, &p, 10 );
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e[0] = ':';
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if( p != e || 0 > val->val.s.i ||
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(size_t)(val->val.s.i) > len - ((p + 1) - buf) )
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{
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return 1;
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}
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val->val.s.s = malloc( val->val.s.i + 1 );
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val->val.s.s[val->val.s.i] = 0;
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memcpy( val->val.s.s, p + 1, val->val.s.i );
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val->end = p + 1 + val->val.s.i;
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}
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*end = val->end;
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return 0;
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}
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static void __bencPrint( benc_val_t * val, int space )
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{
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int i;
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for( i = 0; i < space; i++ )
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{
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fprintf( stderr, " " );
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}
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switch( val->type )
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{
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case TYPE_INT:
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fprintf( stderr, "int: %"PRIu64"\n", val->val.i );
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break;
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case TYPE_STR:
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fprintf( stderr, "%s\n", val->val.s.s );
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break;
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case TYPE_LIST:
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fprintf( stderr, "list\n" );
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for( i = 0; i < val->val.l.count; i++ )
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__bencPrint( &val->val.l.vals[i], space + 1 );
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break;
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case TYPE_DICT:
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fprintf( stderr, "dict\n" );
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for( i = 0; i < val->val.l.count; i++ )
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__bencPrint( &val->val.l.vals[i], space + 1 );
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break;
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}
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}
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void tr_bencPrint( benc_val_t * val )
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{
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__bencPrint( val, 0 );
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}
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void tr_bencFree( benc_val_t * val )
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{
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int i;
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switch( val->type )
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{
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case TYPE_INT:
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break;
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case TYPE_STR:
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if( val->val.s.s )
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{
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free( val->val.s.s );
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}
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break;
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case TYPE_LIST:
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case TYPE_DICT:
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for( i = 0; i < val->val.l.count; i++ )
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{
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tr_bencFree( &val->val.l.vals[i] );
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}
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free( val->val.l.vals );
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break;
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}
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}
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benc_val_t * tr_bencDictFind( benc_val_t * val, char * key )
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{
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int i;
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if( val->type != TYPE_DICT )
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{
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return NULL;
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}
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for( i = 0; i < val->val.l.count; i += 2 )
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{
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if( !strcmp( val->val.l.vals[i].val.s.s, key ) )
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{
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return &val->val.l.vals[i+1];
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}
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}
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return NULL;
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}
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char * tr_bencSaveMalloc( benc_val_t * val, size_t * len )
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{
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char * buf = NULL;
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size_t alloc = 0;
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*len = 0;
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if( tr_bencSave( val, &buf, len, &alloc ) )
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{
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if( NULL != buf )
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{
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free(buf);
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}
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*len = 0;
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return NULL;
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}
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return buf;
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}
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int tr_bencSave( benc_val_t * val, char ** buf, size_t * used, size_t * max )
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{
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int ii;
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switch( val->type )
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{
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case TYPE_INT:
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if( tr_bencSprintf( buf, used, max, "i%"PRIu64"e", val->val.i ) )
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{
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return 1;
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}
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break;
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case TYPE_STR:
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if( (int)strlen(val->val.s.s) != val->val.s.i )
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{
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return 1;
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}
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if( tr_bencSprintf( buf, used, max, "%i:%s",
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val->val.s.i, val->val.s.s ) )
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{
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return 1;
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}
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break;
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case TYPE_LIST:
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case TYPE_DICT:
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if( tr_bencSprintf( buf, used, max,
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(TYPE_LIST == val->type ? "l" : "d") ) )
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{
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return 1;
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}
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for( ii = 0; val->val.l.count > ii; ii++ )
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{
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if( tr_bencSave( val->val.l.vals + ii, buf, used, max ) )
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{
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return 1;
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}
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}
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if( tr_bencSprintf( buf, used, max, "e" ) )
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{
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return 1;
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}
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break;
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}
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return 0;
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}
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static int tr_bencSprintf( char ** buf, size_t * used, size_t * max,
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char * format, ... )
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{
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va_list ap;
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int want;
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char * newbuf;
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va_start( ap, format );
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want = vsnprintf( NULL, 0, format, ap );
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va_end(ap);
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while( *used + want + 1 > *max )
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{
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*max += OUTBUF_SIZE;
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newbuf = realloc( *buf, *max );
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if( NULL == newbuf )
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{
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return 1;
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}
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*buf = newbuf;
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}
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va_start( ap, format );
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*used += vsnprintf( *buf + *used, *max - *used, format, ap );
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va_end( ap );
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return 0;
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}
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