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transmission/libtransmission/bencode.c

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/*
* This file Copyright (C) 2008-2009 Charles Kerr <charles@transmissionbt.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <ctype.h> /* isdigit, isprint, isspace */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <event.h> /* evbuffer */
#include "ConvertUTF.h"
#include "transmission.h"
#include "bencode.h"
#include "json.h"
#include "list.h"
#include "ptrarray.h"
#include "utils.h" /* tr_new(), tr_free() */
#ifndef ENODATA
#define ENODATA EIO
#endif
/**
***
**/
static tr_bool
isContainer( const tr_benc * val )
{
return tr_bencIsList( val ) || tr_bencIsDict( val );
}
static tr_bool
isSomething( const tr_benc * val )
{
return isContainer( val ) || tr_bencIsInt( val ) || tr_bencIsString( val );
}
static void
tr_bencInit( tr_benc * val,
int type )
{
memset( val, 0, sizeof( *val ) );
val->type = type;
}
/***
**** tr_bencParse()
**** tr_bencLoad()
***/
/**
* The initial i and trailing e are beginning and ending delimiters.
* You can have negative numbers such as i-3e. You cannot prefix the
* number with a zero such as i04e. However, i0e is valid.
* Example: i3e represents the integer "3"
* NOTE: The maximum number of bit of this integer is unspecified,
* but to handle it as a signed 64bit integer is mandatory to handle
* "large files" aka .torrent for more that 4Gbyte
*/
int
tr_bencParseInt( const uint8_t * buf,
const uint8_t * bufend,
const uint8_t ** setme_end,
int64_t * setme_val )
{
int err = 0;
char * endptr;
const void * begin;
const void * end;
int64_t val;
if( buf >= bufend )
return EILSEQ;
if( *buf != 'i' )
return EILSEQ;
begin = buf + 1;
end = memchr( begin, 'e', ( bufend - buf ) - 1 );
if( end == NULL )
return EILSEQ;
errno = 0;
val = evutil_strtoll( begin, &endptr, 10 );
if( errno || ( endptr != end ) ) /* incomplete parse */
err = EILSEQ;
else if( val && *(const char*)begin == '0' ) /* no leading zeroes! */
err = EILSEQ;
else
{
*setme_end = (const uint8_t*)end + 1;
*setme_val = val;
}
return err;
}
/**
* Byte strings are encoded as follows:
* <string length encoded in base ten ASCII>:<string data>
* Note that there is no constant beginning delimiter, and no ending delimiter.
* Example: 4:spam represents the string "spam"
*/
int
tr_bencParseStr( const uint8_t * buf,
const uint8_t * bufend,
const uint8_t ** setme_end,
const uint8_t ** setme_str,
size_t * setme_strlen )
{
size_t len;
const void * end;
char * endptr;
if( buf >= bufend )
return EILSEQ;
if( !isdigit( *buf ) )
return EILSEQ;
end = memchr( buf, ':', bufend - buf );
if( end == NULL )
return EILSEQ;
errno = 0;
len = strtoul( (const char*)buf, &endptr, 10 );
if( errno || endptr != end )
return EILSEQ;
if( (const uint8_t*)end + 1 + len > bufend )
return EILSEQ;
*setme_end = (const uint8_t*)end + 1 + len;
*setme_str = (const uint8_t*)end + 1;
*setme_strlen = len;
return 0;
}
/* set to 1 to help expose bugs with tr_bencListAdd and tr_bencDictAdd */
#define LIST_SIZE 8 /* number of items to increment list/dict buffer by */
static int
makeroom( tr_benc * val,
size_t count )
{
assert( TYPE_LIST == val->type || TYPE_DICT == val->type );
if( val->val.l.count + count > val->val.l.alloc )
{
/* We need a bigger boat */
const int len = val->val.l.alloc + count +
( count % LIST_SIZE ? LIST_SIZE -
( count % LIST_SIZE ) : 0 );
void * tmp = realloc( val->val.l.vals, len * sizeof( tr_benc ) );
if( !tmp )
return 1;
val->val.l.alloc = len;
val->val.l.vals = tmp;
}
return 0;
}
static tr_benc*
getNode( tr_benc * top,
tr_ptrArray * parentStack,
int type )
{
tr_benc * parent;
assert( top );
assert( parentStack );
if( tr_ptrArrayEmpty( parentStack ) )
return top;
parent = tr_ptrArrayBack( parentStack );
assert( parent );
/* dictionary keys must be strings */
if( ( parent->type == TYPE_DICT )
&& ( type != TYPE_STR )
&& ( !( parent->val.l.count % 2 ) ) )
return NULL;
makeroom( parent, 1 );
return parent->val.l.vals + parent->val.l.count++;
}
/**
* This function's previous recursive implementation was
* easier to read, but was vulnerable to a smash-stacking
* attack via maliciously-crafted bencoded data. (#667)
*/
static int
tr_bencParseImpl( const void * buf_in,
const void * bufend_in,
tr_benc * top,
tr_ptrArray * parentStack,
const uint8_t ** setme_end )
{
int err;
const uint8_t * buf = buf_in;
const uint8_t * bufend = bufend_in;
tr_bencInit( top, 0 );
while( buf != bufend )
{
if( buf > bufend ) /* no more text to parse... */
return 1;
if( *buf == 'i' ) /* int */
{
int64_t val;
const uint8_t * end;
tr_benc * node;
if( ( err = tr_bencParseInt( buf, bufend, &end, &val ) ) )
return err;
node = getNode( top, parentStack, TYPE_INT );
if( !node )
return EILSEQ;
tr_bencInitInt( node, val );
buf = end;
if( tr_ptrArrayEmpty( parentStack ) )
break;
}
else if( *buf == 'l' ) /* list */
{
tr_benc * node = getNode( top, parentStack, TYPE_LIST );
if( !node )
return EILSEQ;
tr_bencInit( node, TYPE_LIST );
tr_ptrArrayAppend( parentStack, node );
++buf;
}
else if( *buf == 'd' ) /* dict */
{
tr_benc * node = getNode( top, parentStack, TYPE_DICT );
if( !node )
return EILSEQ;
tr_bencInit( node, TYPE_DICT );
tr_ptrArrayAppend( parentStack, node );
++buf;
}
else if( *buf == 'e' ) /* end of list or dict */
{
tr_benc * node;
++buf;
if( tr_ptrArrayEmpty( parentStack ) )
return EILSEQ;
node = tr_ptrArrayBack( parentStack );
if( tr_bencIsDict( node ) && ( node->val.l.count % 2 ) )
{
/* odd # of children in dict */
tr_bencFree( &node->val.l.vals[--node->val.l.count] );
return EILSEQ;
}
tr_ptrArrayPop( parentStack );
if( tr_ptrArrayEmpty( parentStack ) )
break;
}
else if( isdigit( *buf ) ) /* string? */
{
const uint8_t * end;
const uint8_t * str;
size_t str_len;
tr_benc * node;
if( ( err = tr_bencParseStr( buf, bufend, &end, &str, &str_len ) ) )
return err;
node = getNode( top, parentStack, TYPE_STR );
if( !node )
return EILSEQ;
tr_bencInitStr( node, str, str_len );
buf = end;
if( tr_ptrArrayEmpty( parentStack ) )
break;
}
else /* invalid bencoded text... march past it */
{
++buf;
}
}
err = !isSomething( top ) || !tr_ptrArrayEmpty( parentStack );
if( !err && setme_end )
*setme_end = buf;
return err;
}
int
tr_bencParse( const void * buf,
const void * end,
tr_benc * top,
const uint8_t ** setme_end )
{
int err;
tr_ptrArray parentStack = TR_PTR_ARRAY_INIT;
top->type = 0; /* set to `uninitialized' */
err = tr_bencParseImpl( buf, end, top, &parentStack, setme_end );
if( err )
tr_bencFree( top );
tr_ptrArrayDestruct( &parentStack, NULL );
return err;
}
int
tr_bencLoad( const void * buf_in,
size_t buflen,
tr_benc * setme_benc,
char ** setme_end )
{
const uint8_t * buf = buf_in;
const uint8_t * end;
const int ret = tr_bencParse( buf, buf + buflen, setme_benc, &end );
if( !ret && setme_end )
*setme_end = (char*) end;
return ret;
}
/***
****
***/
static int
dictIndexOf( const tr_benc * val,
const char * key )
{
if( tr_bencIsDict( val ) )
{
size_t i;
const size_t len = strlen( key );
for( i = 0; ( i + 1 ) < val->val.l.count; i += 2 )
{
const tr_benc * child = val->val.l.vals + i;
if( ( child->type == TYPE_STR )
&& ( child->val.s.i == len )
&& !memcmp( child->val.s.s, key, len ) )
return i;
}
}
return -1;
}
tr_benc *
tr_bencDictFind( tr_benc * val, const char * key )
{
const int i = dictIndexOf( val, key );
return i < 0 ? NULL : &val->val.l.vals[i + 1];
}
static tr_benc*
tr_bencDictFindType( tr_benc * val,
const char * key,
int type )
{
tr_benc * ret = tr_bencDictFind( val, key );
return ( ret && ( ret->type == type ) ) ? ret : NULL;
}
size_t
tr_bencListSize( const tr_benc * list )
{
return tr_bencIsList( list ) ? list->val.l.count : 0;
}
tr_benc*
tr_bencListChild( tr_benc * val,
size_t i )
{
tr_benc * ret = NULL;
if( tr_bencIsList( val ) && ( i < val->val.l.count ) )
ret = val->val.l.vals + i;
return ret;
}
tr_bool
tr_bencGetInt( const tr_benc * val,
int64_t * setme )
{
const int success = tr_bencIsInt( val );
if( success && setme )
*setme = val->val.i;
return success;
}
tr_bool
tr_bencGetStr( const tr_benc * val,
const char ** setme )
{
const int success = tr_bencIsString( val );
if( success )
*setme = val->val.s.s;
return success;
}
tr_bool
tr_bencDictFindInt( tr_benc * dict, const char * key, int64_t * setme )
{
tr_bool found = FALSE;
tr_benc * child = tr_bencDictFindType( dict, key, TYPE_INT );
if( child )
found = tr_bencGetInt( child, setme );
return found;
}
tr_bool
tr_bencDictFindDouble( tr_benc * dict, const char * key, double * setme )
{
const char * str;
const tr_bool success = tr_bencDictFindStr( dict, key, &str );
if( success && setme )
*setme = strtod( str, NULL );
return success;
}
tr_bool
tr_bencDictFindList( tr_benc * dict, const char * key, tr_benc ** setme )
{
tr_bool found = FALSE;
tr_benc * child = tr_bencDictFindType( dict, key, TYPE_LIST );
if( child )
{
if( setme != NULL )
*setme = child;
found = TRUE;
}
return found;
}
tr_bool
tr_bencDictFindDict( tr_benc * dict, const char * key, tr_benc ** setme )
{
tr_bool found = FALSE;
tr_benc * child = tr_bencDictFindType( dict, key, TYPE_DICT );
if( child )
{
if( setme != NULL )
*setme = child;
found = TRUE;
}
return found;
}
tr_bool
tr_bencDictFindStr( tr_benc * dict, const char * key, const char ** setme )
{
tr_bool found = FALSE;
tr_benc * child = tr_bencDictFindType( dict, key, TYPE_STR );
if( child )
{
if( setme )
*setme = child->val.s.s;
found = TRUE;
}
return found;
}
tr_bool
tr_bencDictFindRaw( tr_benc * dict,
const char * key,
const uint8_t ** setme_raw,
size_t * setme_len )
{
tr_bool found = FALSE;
tr_benc * child = tr_bencDictFindType( dict, key, TYPE_STR );
if( child )
{
*setme_raw = (uint8_t*) child->val.s.s;
*setme_len = child->val.s.i;
found = TRUE;
}
return found;
}
/***
****
***/
void
tr_bencInitRaw( tr_benc * val,
const void * src,
size_t byteCount )
{
tr_bencInit( val, TYPE_STR );
val->val.s.i = byteCount;
val->val.s.s = tr_memdup( src, byteCount );
}
void
tr_bencInitStr( tr_benc * val,
const void * str,
int len )
{
tr_bencInit( val, TYPE_STR );
val->val.s.s = tr_strndup( str, len );
if( val->val.s.s == NULL )
val->val.s.i = 0;
else if( len < 0 )
val->val.s.i = strlen( val->val.s.s );
else
val->val.s.i = len;
}
void
tr_bencInitInt( tr_benc * val,
int64_t num )
{
tr_bencInit( val, TYPE_INT );
val->val.i = num;
}
int
tr_bencInitList( tr_benc * val,
size_t reserveCount )
{
tr_bencInit( val, TYPE_LIST );
return tr_bencListReserve( val, reserveCount );
}
int
tr_bencListReserve( tr_benc * val,
size_t count )
{
assert( tr_bencIsList( val ) );
return makeroom( val, count );
}
int
tr_bencInitDict( tr_benc * val,
size_t reserveCount )
{
tr_bencInit( val, TYPE_DICT );
return tr_bencDictReserve( val, reserveCount );
}
int
tr_bencDictReserve( tr_benc * val,
size_t reserveCount )
{
assert( tr_bencIsDict( val ) );
return makeroom( val, reserveCount * 2 );
}
tr_benc *
tr_bencListAdd( tr_benc * list )
{
tr_benc * item;
assert( tr_bencIsList( list ) );
if( list->val.l.count == list->val.l.alloc )
tr_bencListReserve( list, LIST_SIZE );
assert( list->val.l.count < list->val.l.alloc );
item = &list->val.l.vals[list->val.l.count];
list->val.l.count++;
tr_bencInit( item, TYPE_INT );
return item;
}
tr_benc *
tr_bencListAddInt( tr_benc * list,
int64_t val )
{
tr_benc * node = tr_bencListAdd( list );
tr_bencInitInt( node, val );
return node;
}
tr_benc *
tr_bencListAddStr( tr_benc * list,
const char * val )
{
tr_benc * node = tr_bencListAdd( list );
tr_bencInitStr( node, val, -1 );
return node;
}
tr_benc*
tr_bencListAddList( tr_benc * list,
size_t reserveCount )
{
tr_benc * child = tr_bencListAdd( list );
tr_bencInitList( child, reserveCount );
return child;
}
tr_benc*
tr_bencListAddDict( tr_benc * list,
size_t reserveCount )
{
tr_benc * child = tr_bencListAdd( list );
tr_bencInitDict( child, reserveCount );
return child;
}
tr_benc *
tr_bencDictAdd( tr_benc * dict,
const char * key )
{
tr_benc * keyval, * itemval;
assert( tr_bencIsDict( dict ) );
if( dict->val.l.count + 2 > dict->val.l.alloc )
makeroom( dict, 2 );
assert( dict->val.l.count + 2 <= dict->val.l.alloc );
keyval = dict->val.l.vals + dict->val.l.count++;
tr_bencInitStr( keyval, key, -1 );
itemval = dict->val.l.vals + dict->val.l.count++;
tr_bencInit( itemval, TYPE_INT );
return itemval;
}
tr_benc*
tr_bencDictAddInt( tr_benc * dict,
const char * key,
int64_t val )
{
tr_benc * child;
/* see if it already exists, and if so, try to reuse it */
if(( child = tr_bencDictFind( dict, key ))) {
if( !tr_bencIsInt( child ) ) {
tr_bencDictRemove( dict, key );
child = NULL;
}
}
/* if it doesn't exist, create it */
if( child == NULL )
child = tr_bencDictAdd( dict, key );
/* set it */
tr_bencInitInt( child, val );
return child;
}
tr_benc*
tr_bencDictAddStr( tr_benc * dict, const char * key, const char * val )
{
tr_benc * child;
/* see if it already exists, and if so, try to reuse it */
if(( child = tr_bencDictFind( dict, key ))) {
if( tr_bencIsString( child ) )
tr_free( child->val.s.s );
else {
tr_bencDictRemove( dict, key );
child = NULL;
}
}
/* if it doesn't exist, create it */
if( child == NULL )
child = tr_bencDictAdd( dict, key );
/* set it */
tr_bencInitStr( child, val, -1 );
return child;
}
tr_benc*
tr_bencDictAddDouble( tr_benc * dict,
const char * key,
double d )
{
char buf[128];
char * locale;
/* the json spec requires a '.' decimal point regardless of locale */
locale = tr_strdup( setlocale ( LC_NUMERIC, NULL ) );
setlocale( LC_NUMERIC, "POSIX" );
tr_snprintf( buf, sizeof( buf ), "%f", d );
setlocale( LC_NUMERIC, locale );
tr_free( locale );
return tr_bencDictAddStr( dict, key, buf );
}
tr_benc*
tr_bencDictAddList( tr_benc * dict,
const char * key,
size_t reserveCount )
{
tr_benc * child = tr_bencDictAdd( dict, key );
tr_bencInitList( child, reserveCount );
return child;
}
tr_benc*
tr_bencDictAddDict( tr_benc * dict,
const char * key,
size_t reserveCount )
{
tr_benc * child = tr_bencDictAdd( dict, key );
tr_bencInitDict( child, reserveCount );
return child;
}
tr_benc*
tr_bencDictAddRaw( tr_benc * dict,
const char * key,
const void * src,
size_t len )
{
tr_benc * child = tr_bencDictAdd( dict, key );
tr_bencInitRaw( child, src, len );
return child;
}
int
tr_bencDictRemove( tr_benc * dict,
const char * key )
{
int i = dictIndexOf( dict, key );
if( i >= 0 )
{
const int n = dict->val.l.count;
tr_bencFree( &dict->val.l.vals[i] );
tr_bencFree( &dict->val.l.vals[i + 1] );
if( i + 2 < n )
{
dict->val.l.vals[i] = dict->val.l.vals[n - 2];
dict->val.l.vals[i + 1] = dict->val.l.vals[n - 1];
}
dict->val.l.count -= 2;
}
return i >= 0; /* return true if found */
}
/***
**** BENC WALKING
***/
struct KeyIndex
{
const char * key;
int index;
};
static int
compareKeyIndex( const void * va,
const void * vb )
{
const struct KeyIndex * a = va;
const struct KeyIndex * b = vb;
return strcmp( a->key, b->key );
}
struct SaveNode
{
const tr_benc * val;
int valIsVisited;
int childCount;
int childIndex;
int * children;
};
static struct SaveNode*
nodeNewDict( const tr_benc * val )
{
int i, j;
int nKeys;
struct SaveNode * node;
struct KeyIndex * indices;
assert( tr_bencIsDict( val ) );
nKeys = val->val.l.count / 2;
node = tr_new0( struct SaveNode, 1 );
node->val = val;
node->children = tr_new0( int, nKeys * 2 );
/* ugh, a dictionary's children have to be sorted by key... */
indices = tr_new( struct KeyIndex, nKeys );
for( i = j = 0; i < ( nKeys * 2 ); i += 2, ++j )
{
indices[j].key = val->val.l.vals[i].val.s.s;
indices[j].index = i;
}
qsort( indices, j, sizeof( struct KeyIndex ), compareKeyIndex );
for( i = 0; i < j; ++i )
{
const int index = indices[i].index;
node->children[node->childCount++] = index;
node->children[node->childCount++] = index + 1;
}
assert( node->childCount == nKeys * 2 );
tr_free( indices );
return node;
}
static struct SaveNode*
nodeNewList( const tr_benc * val )
{
int i, n;
struct SaveNode * node;
assert( tr_bencIsList( val ) );
n = val->val.l.count;
node = tr_new0( struct SaveNode, 1 );
node->val = val;
node->childCount = n;
node->children = tr_new0( int, n );
for( i = 0; i < n; ++i ) /* a list's children don't need to be reordered */
node->children[i] = i;
return node;
}
static struct SaveNode*
nodeNewLeaf( const tr_benc * val )
{
struct SaveNode * node;
assert( !isContainer( val ) );
node = tr_new0( struct SaveNode, 1 );
node->val = val;
return node;
}
static struct SaveNode*
nodeNew( const tr_benc * val )
{
struct SaveNode * node;
if( tr_bencIsList( val ) )
node = nodeNewList( val );
else if( tr_bencIsDict( val ) )
node = nodeNewDict( val );
else
node = nodeNewLeaf( val );
return node;
}
typedef void ( *BencWalkFunc )( const tr_benc * val, void * user_data );
struct WalkFuncs
{
BencWalkFunc intFunc;
BencWalkFunc stringFunc;
BencWalkFunc dictBeginFunc;
BencWalkFunc listBeginFunc;
BencWalkFunc containerEndFunc;
};
/**
* This function's previous recursive implementation was
* easier to read, but was vulnerable to a smash-stacking
* attack via maliciously-crafted bencoded data. (#667)
*/
static void
bencWalk( const tr_benc * top,
struct WalkFuncs * walkFuncs,
void * user_data )
{
tr_ptrArray stack = TR_PTR_ARRAY_INIT;
tr_ptrArrayAppend( &stack, nodeNew( top ) );
while( !tr_ptrArrayEmpty( &stack ) )
{
struct SaveNode * node = tr_ptrArrayBack( &stack );
const tr_benc * val;
if( !node->valIsVisited )
{
val = node->val;
node->valIsVisited = TRUE;
}
else if( node->childIndex < node->childCount )
{
const int index = node->children[node->childIndex++];
val = node->val->val.l.vals + index;
}
else /* done with this node */
{
if( isContainer( node->val ) )
walkFuncs->containerEndFunc( node->val, user_data );
tr_ptrArrayPop( &stack );
tr_free( node->children );
tr_free( node );
continue;
}
if( val ) switch( val->type )
{
case TYPE_INT:
walkFuncs->intFunc( val, user_data );
break;
case TYPE_STR:
walkFuncs->stringFunc( val, user_data );
break;
case TYPE_LIST:
if( val != node->val )
tr_ptrArrayAppend( &stack, nodeNew( val ) );
else
walkFuncs->listBeginFunc( val, user_data );
break;
case TYPE_DICT:
if( val != node->val )
tr_ptrArrayAppend( &stack, nodeNew( val ) );
else
walkFuncs->dictBeginFunc( val, user_data );
break;
default:
/* did caller give us an uninitialized val? */
tr_err( _( "Invalid metadata" ) );
break;
}
}
tr_ptrArrayDestruct( &stack, NULL );
}
/****
*****
****/
static void
saveIntFunc( const tr_benc * val,
void * evbuf )
{
evbuffer_add_printf( evbuf, "i%" PRId64 "e", val->val.i );
}
static void
saveStringFunc( const tr_benc * val,
void * vevbuf )
{
struct evbuffer * evbuf = vevbuf;
evbuffer_add_printf( evbuf, "%lu:", (unsigned long)val->val.s.i );
evbuffer_add( evbuf, val->val.s.s, val->val.s.i );
}
static void
saveDictBeginFunc( const tr_benc * val UNUSED,
void * evbuf )
{
evbuffer_add_printf( evbuf, "d" );
}
static void
saveListBeginFunc( const tr_benc * val UNUSED,
void * evbuf )
{
evbuffer_add_printf( evbuf, "l" );
}
static void
saveContainerEndFunc( const tr_benc * val UNUSED,
void * evbuf )
{
evbuffer_add_printf( evbuf, "e" );
}
char*
tr_bencSave( const tr_benc * top,
int * len )
{
char * ret;
struct WalkFuncs walkFuncs;
struct evbuffer * out = tr_getBuffer( );
walkFuncs.intFunc = saveIntFunc;
walkFuncs.stringFunc = saveStringFunc;
walkFuncs.dictBeginFunc = saveDictBeginFunc;
walkFuncs.listBeginFunc = saveListBeginFunc;
walkFuncs.containerEndFunc = saveContainerEndFunc;
bencWalk( top, &walkFuncs, out );
if( len )
*len = EVBUFFER_LENGTH( out );
ret = tr_strndup( EVBUFFER_DATA( out ), EVBUFFER_LENGTH( out ) );
tr_releaseBuffer( out );
return ret;
}
/***
****
***/
static void
freeDummyFunc( const tr_benc * val UNUSED,
void * buf UNUSED )
{}
static void
freeStringFunc( const tr_benc * val,
void * freeme )
{
tr_ptrArrayAppend( freeme, val->val.s.s );
}
static void
freeContainerBeginFunc( const tr_benc * val,
void * freeme )
{
tr_ptrArrayAppend( freeme, val->val.l.vals );
}
void
tr_bencFree( tr_benc * val )
{
if( val && val->type )
{
tr_ptrArray a = TR_PTR_ARRAY_INIT;
struct WalkFuncs walkFuncs;
walkFuncs.intFunc = freeDummyFunc;
walkFuncs.stringFunc = freeStringFunc;
walkFuncs.dictBeginFunc = freeContainerBeginFunc;
walkFuncs.listBeginFunc = freeContainerBeginFunc;
walkFuncs.containerEndFunc = freeDummyFunc;
bencWalk( val, &walkFuncs, &a );
tr_ptrArrayDestruct( &a, tr_free );
}
}
/***
****
***/
struct ParentState
{
int bencType;
int childIndex;
int childCount;
};
struct jsonWalk
{
tr_list * parents;
struct evbuffer * out;
};
static void
jsonIndent( struct jsonWalk * data )
{
const int width = tr_list_size( data->parents ) * 4;
evbuffer_add_printf( data->out, "\n%*.*s", width, width, " " );
}
static void
jsonChildFunc( struct jsonWalk * data )
{
if( data->parents )
{
struct ParentState * parentState = data->parents->data;
switch( parentState->bencType )
{
case TYPE_DICT:
{
const int i = parentState->childIndex++;
if( !( i % 2 ) )
evbuffer_add_printf( data->out, ": " );
else
{
evbuffer_add_printf( data->out, ", " );
jsonIndent( data );
}
break;
}
case TYPE_LIST:
{
++parentState->childIndex;
evbuffer_add_printf( data->out, ", " );
jsonIndent( data );
break;
}
default:
break;
}
}
}
static void
jsonPushParent( struct jsonWalk * data,
const tr_benc * benc )
{
struct ParentState * parentState = tr_new( struct ParentState, 1 );
parentState->bencType = benc->type;
parentState->childIndex = 0;
parentState->childCount = benc->val.l.count;
tr_list_prepend( &data->parents, parentState );
}
static void
jsonPopParent( struct jsonWalk * data )
{
tr_free( tr_list_pop_front( &data->parents ) );
}
static void
jsonIntFunc( const tr_benc * val,
void * vdata )
{
struct jsonWalk * data = vdata;
evbuffer_add_printf( data->out, "%" PRId64, val->val.i );
jsonChildFunc( data );
}
static void
jsonStringFunc( const tr_benc * val,
void * vdata )
{
struct jsonWalk * data = vdata;
const unsigned char *it, *end;
evbuffer_add_printf( data->out, "\"" );
for( it = (const unsigned char*)val->val.s.s, end = it + val->val.s.i;
it != end; ++it )
{
switch( *it )
{
case '/':
evbuffer_add_printf( data->out, "\\/" ); break;
case '\b':
evbuffer_add_printf( data->out, "\\b" ); break;
case '\f':
evbuffer_add_printf( data->out, "\\f" ); break;
case '\n':
evbuffer_add_printf( data->out, "\\n" ); break;
case '\r':
evbuffer_add_printf( data->out, "\\r" ); break;
case '\t':
evbuffer_add_printf( data->out, "\\t" ); break;
case '"':
evbuffer_add_printf( data->out, "\\\"" ); break;
case '\\':
evbuffer_add_printf( data->out, "\\\\" ); break;
default:
if( isascii( *it ) )
{
/*fprintf( stderr, "[%c]\n", *it );*/
evbuffer_add_printf( data->out, "%c", *it );
}
else
{
const UTF8 * tmp = it;
UTF32 buf = 0;
UTF32 * u32 = &buf;
ConversionResult result = ConvertUTF8toUTF32( &tmp, end, &u32, &buf + 1, 0 );
if( ( result != conversionOK ) && ( tmp == it ) )
++it; /* it's beyond help; skip it */
else {
evbuffer_add_printf( data->out, "\\u%04x", (unsigned int)buf );
it = tmp - 1;
}
/*fprintf( stderr, "[\\u%04x]\n", buf );*/
}
}
}
evbuffer_add_printf( data->out, "\"" );
jsonChildFunc( data );
}
static void
jsonDictBeginFunc( const tr_benc * val,
void * vdata )
{
struct jsonWalk * data = vdata;
jsonPushParent( data, val );
evbuffer_add_printf( data->out, "{" );
if( val->val.l.count )
jsonIndent( data );
}
static void
jsonListBeginFunc( const tr_benc * val,
void * vdata )
{
const size_t nChildren = tr_bencListSize( val );
struct jsonWalk * data = vdata;
jsonPushParent( data, val );
evbuffer_add_printf( data->out, "[" );
if( nChildren )
jsonIndent( data );
}
static void
jsonContainerEndFunc( const tr_benc * val,
void * vdata )
{
size_t i;
struct jsonWalk * data = vdata;
char * str;
int emptyContainer = FALSE;
/* trim out the trailing comma, if any */
str = (char*) EVBUFFER_DATA( data->out );
for( i = EVBUFFER_LENGTH( data->out ) - 1; i > 0; --i )
{
if( isspace( str[i] ) ) continue;
if( str[i] == ',' )
EVBUFFER_LENGTH( data->out ) = i;
if( str[i] == '{' || str[i] == '[' )
emptyContainer = TRUE;
break;
}
jsonPopParent( data );
if( !emptyContainer )
jsonIndent( data );
if( tr_bencIsDict( val ) )
evbuffer_add_printf( data->out, "}" );
else /* list */
evbuffer_add_printf( data->out, "]" );
jsonChildFunc( data );
}
char*
tr_bencSaveAsJSON( const tr_benc * top, struct evbuffer * out )
{
struct WalkFuncs walkFuncs;
struct jsonWalk data;
evbuffer_drain( out, EVBUFFER_LENGTH( out ) );
data.out = out;
data.parents = NULL;
walkFuncs.intFunc = jsonIntFunc;
walkFuncs.stringFunc = jsonStringFunc;
walkFuncs.dictBeginFunc = jsonDictBeginFunc;
walkFuncs.listBeginFunc = jsonListBeginFunc;
walkFuncs.containerEndFunc = jsonContainerEndFunc;
bencWalk( top, &walkFuncs, &data );
if( EVBUFFER_LENGTH( out ) )
evbuffer_add_printf( out, "\n" );
return (char*) EVBUFFER_DATA( out );
}
char*
tr_bencToJSON( const tr_benc * top )
{
char * ret;
struct evbuffer * buf = evbuffer_new( );
tr_bencSaveAsJSON( top, buf );
ret = tr_strndup( EVBUFFER_DATA( buf ), EVBUFFER_LENGTH( buf ) );
evbuffer_free( buf );
return ret;
}
/***
****
***/
static size_t
tr_bencDictSize( const tr_benc * dict )
{
size_t count = 0;
if( tr_bencIsDict( dict ) )
count = dict->val.l.count / 2;
return count;
}
static tr_bool
tr_bencDictChild( const tr_benc * dict, size_t n, const char ** key, const tr_benc ** val )
{
tr_bool success = 0;
assert( tr_bencIsDict( dict ) );
if( tr_bencIsDict( dict ) && (n*2)+1 <= dict->val.l.count )
{
tr_benc * k = dict->val.l.vals + (n*2);
tr_benc * v = dict->val.l.vals + (n*2) + 1;
if(( success = tr_bencGetStr( k, key ) && isSomething( v )))
*val = v;
}
return success;
}
void
tr_bencMergeDicts( tr_benc * target, const tr_benc * source )
{
size_t i;
const size_t sourceCount = tr_bencDictSize( source );
assert( tr_bencIsDict( target ) );
assert( tr_bencIsDict( source ) );
for( i=0; i<sourceCount; ++i )
{
const char * key;
const tr_benc * val;
if( tr_bencDictChild( source, i, &key, &val ) )
{
int64_t i64;
const char * str;
tr_benc * t;
if( tr_bencGetInt( val, &i64 ) )
{
tr_bencDictRemove( target, key );
tr_bencDictAddInt( target, key, i64 );
}
else if( tr_bencGetStr( val, &str ) )
{
tr_bencDictRemove( target, key );
tr_bencDictAddStr( target, key, str );
}
else if( tr_bencIsDict( val ) && tr_bencDictFindDict( target, key, &t ) )
{
tr_bencMergeDicts( t, val );
}
else
{
tr_dbg( "tr_bencMergeDicts skipping \"%s\"", key );
}
}
}
}
/***
****
***/
static int
saveFile( const char * filename,
const char * content,
size_t len )
{
int err = 0;
FILE * out = NULL;
out = fopen( filename, "wb+" );
if( !out )
{
err = errno;
tr_err( _( "Couldn't open \"%1$s\": %2$s" ),
filename, tr_strerror( errno ) );
}
else if( fwrite( content, sizeof( char ), len, out ) != (size_t)len )
{
err = errno;
tr_err( _( "Couldn't save file \"%1$s\": %2$s" ),
filename, tr_strerror( errno ) );
}
if( !err )
tr_dbg( "tr_bencSaveFile saved \"%s\"", filename );
if( out )
fclose( out );
return err;
}
int
tr_bencSaveFile( const char * filename,
const tr_benc * b )
{
int len;
char * content = tr_bencSave( b, &len );
const int err = saveFile( filename, content, len );
tr_free( content );
return err;
}
int
tr_bencSaveJSONFile( const char * filename,
const tr_benc * b )
{
struct evbuffer * buf = tr_getBuffer( );
const char * json = tr_bencSaveAsJSON( b, buf );
const int err = saveFile( filename, json, EVBUFFER_LENGTH( buf ) );
tr_releaseBuffer( buf );
return err;
}
/***
****
***/
int
tr_bencLoadFile( const char * filename, tr_benc * b )
{
int err;
size_t contentLen;
uint8_t * content;
content = tr_loadFile( filename, &contentLen );
if( !content && errno )
err = errno;
else if( !content )
err = ENODATA;
else
err = tr_bencLoad( content, contentLen, b, NULL );
tr_free( content );
return err;
}
int
tr_bencLoadJSONFile( const char * filename, tr_benc * b )
{
int err;
size_t contentLen;
uint8_t * content;
content = tr_loadFile( filename, &contentLen );
if( !content && errno )
err = errno;
else if( !content )
err = ENODATA;
else
err = tr_jsonParse( content, contentLen, b, NULL );
tr_free( content );
return err;
}
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