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Commit c69d0735 authored by Laurent Aimar's avatar Laurent Aimar
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* libavi.c: improved parsing of some corrupted files.

parent 75cd9924
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Showing with 51 additions and 39 deletions
modules/demux/avi/libavi.c
View file @ c69d0735
/*****************************************************************************
* libavi.c :
* libavi.c :
*****************************************************************************
* Copyright (C) 2001 VideoLAN
* $Id: libavi.c,v 1.9 2002/12/06 16:34:06 sam Exp $
* $Id: libavi.c,v 1.10 2002/12/16 13:04:36 fenrir Exp $
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
*
* 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
......@@ -41,7 +41,7 @@
if( p ) {free( p ); p = NULL; }
#define __EVEN( x ) ( (x)&0x01 ? (x)+1 : (x) )
/* Some functions to manipulate memory */
static uint16_t GetWLE( uint8_t *p_buff )
{
......@@ -61,7 +61,7 @@ static vlc_fourcc_t GetFOURCC( byte_t *p_buff )
* Some basic functions to manipulate stream more easily in vlc
*
* AVI_TellAbsolute get file position
*
*
* AVI_SeekAbsolute seek in the file
*
* AVI_ReadData read data from the file in a buffer
......@@ -72,9 +72,9 @@ static vlc_fourcc_t GetFOURCC( byte_t *p_buff )
off_t AVI_TellAbsolute( input_thread_t *p_input )
{
off_t i_pos;
vlc_mutex_lock( &p_input->stream.stream_lock );
i_pos= p_input->stream.p_selected_area->i_tell;
// - ( p_input->p_last_data - p_input->p_current_data );
......@@ -82,7 +82,7 @@ off_t AVI_TellAbsolute( input_thread_t *p_input )
return i_pos;
}
int AVI_SeekAbsolute( input_thread_t *p_input,
off_t i_pos)
{
......@@ -92,7 +92,7 @@ int AVI_SeekAbsolute( input_thread_t *p_input,
{
return VLC_EGENERIC;
}
i_filepos = AVI_TellAbsolute( p_input );
if( i_filepos == i_pos )
......@@ -111,7 +111,7 @@ int AVI_SeekAbsolute( input_thread_t *p_input,
{
data_packet_t *p_data;
int i_skip = i_pos - i_filepos;
msg_Warn( p_input, "will skip %d bytes, slow", i_skip );
if( i_skip < 0 )
{
......@@ -120,7 +120,7 @@ int AVI_SeekAbsolute( input_thread_t *p_input,
while (i_skip > 0 )
{
int i_read;
i_read = input_SplitBuffer( p_input, &p_data,
__MIN( 4096, i_skip ) );
if( i_read < 0 )
......@@ -128,7 +128,7 @@ int AVI_SeekAbsolute( input_thread_t *p_input,
return VLC_EGENERIC;
}
i_skip -= i_read;
input_DeletePacket( p_input->p_method_data, p_data );
if( i_read == 0 && i_skip > 0 )
{
......@@ -162,7 +162,7 @@ int AVI_ReadData( input_thread_t *p_input, uint8_t *p_buff, int i_size )
int i_count;
int i_read = 0;
if( !i_size )
{
return 0;
......@@ -177,13 +177,13 @@ int AVI_ReadData( input_thread_t *p_input, uint8_t *p_buff, int i_size )
}
memcpy( p_buff, p_data->p_payload_start, i_count );
input_DeletePacket( p_input->p_method_data, p_data );
p_buff += i_count;
i_size -= i_count;
i_read += i_count;
} while( i_size );
return i_read;
}
......@@ -195,11 +195,11 @@ int AVI_SkipBytes( input_thread_t *p_input, int i_count )
vlc_mutex_lock( &p_input->stream.stream_lock );
i_buff_size = p_input->p_last_data - p_input->p_current_data;
vlc_mutex_unlock( &p_input->stream.stream_lock );
if( i_count > 0 && i_count + 1 < i_buff_size )
{
uint8_t *p_peek;
input_Peek( p_input, &p_peek, i_count + 1 );
vlc_mutex_lock( &p_input->stream.stream_lock );
......@@ -210,7 +210,7 @@ int AVI_SkipBytes( input_thread_t *p_input, int i_count )
else
#endif
{
return AVI_SeekAbsolute( p_input,
return AVI_SeekAbsolute( p_input,
AVI_TellAbsolute( p_input ) + i_count );
}
}
......@@ -218,14 +218,14 @@ int AVI_SkipBytes( input_thread_t *p_input, int i_count )
/*****************************************************************************
*
* AVI_TestFile: look at first bytes to see if it's a valid avi file
*
*
* unseekable: ok
*
*****************************************************************************/
int AVI_TestFile( input_thread_t *p_input )
{
uint8_t *p_peek;
if( input_Peek( p_input, &p_peek, 8 ) < 8 )
{
msg_Err( p_input, "cannot peek()" );
......@@ -259,7 +259,7 @@ static int AVI_ChunkReadCommon( input_thread_t *p_input,
{
return VLC_EGENERIC;
}
p_chk->common.i_chunk_fourcc = GetFOURCC( p_peek );
p_chk->common.i_chunk_size = GetDWLE( p_peek + 4 );
p_chk->common.i_chunk_pos = AVI_TellAbsolute( p_input );
......@@ -270,7 +270,8 @@ static int AVI_ChunkReadCommon( input_thread_t *p_input,
p_chk->common.p_next = NULL;
#ifdef AVI_DEBUG
msg_Dbg( p_input,
"Found Chunk fourcc:%c%c%c%c size:"I64Fd" pos:"I64Fd,
"Found Chunk fourcc:%8.8x (%c%c%c%c) size:"I64Fd" pos:"I64Fd,
p_chk->common.i_chunk_fourcc,
AVIFOURCC_PRINT( p_chk->common.i_chunk_fourcc ),
p_chk->common.i_chunk_size,
p_chk->common.i_chunk_pos );
......@@ -282,7 +283,7 @@ static int AVI_NextChunk( input_thread_t *p_input,
avi_chunk_t *p_chk )
{
avi_chunk_t chk;
if( !p_chk )
{
if( AVI_ChunkReadCommon( p_input, &chk ) )
......@@ -328,7 +329,7 @@ static int AVI_ChunkRead_list( input_thread_t *p_input,
{
avi_chunk_t *p_chk;
uint8_t *p_peek;
if( p_container->common.i_chunk_size < 8 )
{
/* empty box */
......@@ -356,12 +357,17 @@ static int AVI_ChunkRead_list( input_thread_t *p_input,
}
}
AVI_SkipBytes( p_input, 12 );
if( AVI_SkipBytes( p_input, 12 ) )
{
msg_Err( p_input, "cannot enter chunk" );
return VLC_EGENERIC;
}
#ifdef AVI_DEBUG
msg_Dbg( p_input,
"found LIST chunk: \'%c%c%c%c\'",
AVIFOURCC_PRINT( p_container->list.i_type ) );
#endif
msg_Dbg( p_input, "<list \'%c%c%c%c\'>", AVIFOURCC_PRINT( p_container->list.i_type ) );
for( ; ; )
{
p_chk = malloc( sizeof( avi_chunk_t ) );
......@@ -390,8 +396,9 @@ static int AVI_ChunkRead_list( input_thread_t *p_input,
break;
}
}
}
msg_Dbg( p_input, "</list \'%c%c%c%c\'>", AVIFOURCC_PRINT( p_container->list.i_type ) );
return VLC_SUCCESS;
}
......@@ -405,7 +412,7 @@ static int AVI_ChunkRead_list( input_thread_t *p_input,
i_read = AVI_ReadData( p_input, p_read, i_read ); \
p_read += 8; \
i_read -= 8
#define AVI_READCHUNK_EXIT( code ) \
free( p_buff ); \
if( i_read < 0 ) \
......@@ -422,7 +429,7 @@ static int AVI_ChunkRead_list( input_thread_t *p_input,
i_dword = GetDWLE( p_read ); \
p_read += 4; \
i_read -= 4
#define AVI_READFOURCC( i_dword ) \
i_dword = GetFOURCC( p_read ); \
p_read += 4; \
......@@ -488,7 +495,7 @@ static int AVI_ChunkRead_strh( input_thread_t *p_input,
( p_chk->strh.i_scale ?
(float)p_chk->strh.i_rate / (float)p_chk->strh.i_scale : -1) );
#endif
AVI_READCHUNK_EXIT( VLC_SUCCESS );
}
......@@ -509,7 +516,7 @@ static int AVI_ChunkRead_strf( input_thread_t *p_input,
msg_Err( p_input, "malformed avi file" );
AVI_READCHUNK_EXIT( VLC_EGENERIC );
}
switch( p_strh->strh.i_type )
{
case( AVIFOURCC_auds ):
......@@ -694,7 +701,7 @@ static int AVI_ChunkRead_strz( input_thread_t *p_input,
memcpy( p_strz->p_str, p_read, i_read );
}
p_strz->p_str[i_read] = 0;
#ifdef AVI_DEBUG
msg_Dbg( p_input, "%c%c%c%c: %s : %s",
AVIFOURCC_PRINT( p_strz->i_chunk_fourcc), p_strz->p_type, p_strz->p_str);
......@@ -799,6 +806,11 @@ int _AVI_ChunkRead( input_thread_t *p_input,
msg_Warn( p_input, "cannot read one chunk" );
return VLC_EGENERIC;
}
if( p_chk->common.i_chunk_fourcc == VLC_FOURCC( 0, 0, 0, 0 ) )
{
msg_Warn( p_input, "found null fourcc chunk (corrupted file?)" );
return VLC_EGENERIC;
}
p_chk->common.p_father = p_father;
i_index = AVI_ChunkFunctionFind( p_chk->common.i_chunk_fourcc );
......@@ -822,7 +834,7 @@ void _AVI_ChunkFree( input_thread_t *p_input,
{
return;
}
/* Free all child chunk */
p_child = p_chk->common.p_first;
while( p_child )
......@@ -848,7 +860,7 @@ void _AVI_ChunkFree( input_thread_t *p_input,
}
p_chk->common.p_first = NULL;
p_chk->common.p_last = NULL;
return;
}
......@@ -858,7 +870,7 @@ int AVI_ChunkReadRoot( input_thread_t *p_input,
{
avi_chunk_list_t *p_list = (avi_chunk_list_t*)p_root;
avi_chunk_t *p_chk;
p_list->i_chunk_pos = 0;
p_list->i_chunk_size = p_input->stream.p_selected_area->i_size;
p_list->i_chunk_fourcc = AVIFOURCC_LIST;
......@@ -868,7 +880,7 @@ int AVI_ChunkReadRoot( input_thread_t *p_input,
p_list->p_last = NULL;
p_list->i_type = VLC_FOURCC( 'r', 'o', 'o', 't' );
for( ; ; )
{
p_chk = malloc( sizeof( avi_chunk_t ) );
......@@ -897,7 +909,7 @@ int AVI_ChunkReadRoot( input_thread_t *p_input,
break;
}
}
return VLC_SUCCESS;
}
......
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