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/*
File: file_asf.c
Copyright (C) 1998-2010 Christophe GRENIER <grenier@cgsecurity.org>
This software 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 the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
#include "log.h"
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_asf)
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_asf(file_stat_t *file_stat);
const file_hint_t file_hint_asf= {
.extension="asf",
.description="ASF, WMA, WMV: Advanced Streaming Format used for Audio/Video",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_asf
};
struct asf_header_obj_s {
unsigned char object_id[16];
uint64_t object_size;
uint32_t nbr_header_obj;
char reserved1; /* 1 */
char reserved2; /* 2 */
} __attribute__ ((gcc_struct, __packed__));
struct asf_file_prop_s {
unsigned char object_id[16];
uint64_t object_size;
unsigned char file_id[16];
uint64_t file_size;
int64_t file_date;
} __attribute__ ((gcc_struct, __packed__));
struct asf_stream_prop_s {
unsigned char object_id[16];
uint64_t object_size;
unsigned char stream_type[16];
} __attribute__ ((gcc_struct, __packed__));
static const char *extension_wma="wma";
static const char *extension_wmv="wmv";
/*@
@ requires buffer_size > sizeof(struct asf_header_obj_s);
@ requires separation: \separated(&file_hint_asf, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_asf(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
const struct asf_header_obj_s *hdr=(const struct asf_header_obj_s*)buffer;
const char *extension=file_hint_asf.extension;
const unsigned int nbr_header_obj=le32(hdr->nbr_header_obj);
uint64_t size=0;
time_t time=0;
unsigned int i;
uint64_t offset_prop=sizeof(struct asf_header_obj_s);
/* Header + File Properties + Stream Properties + Header Extension */
if(le64(hdr->object_size)<30 ||
le64(hdr->object_size) >= PHOTOREC_MAX_FILE_SIZE ||
nbr_header_obj<4)
return 0;
/*@
@ loop assigns extension, i, size, time, offset_prop;
@ loop variant nbr_header_obj - i;
@*/
for(i=0;
i < nbr_header_obj && offset_prop + 0x28 < buffer_size;
i++)
{
const struct asf_file_prop_s *prop=(const struct asf_file_prop_s*)&buffer[offset_prop];
const uint64_t object_size=le64(prop->object_size);
// ASF_File_Properties_Object // 8CABDCA1-A947-11CF-8EE4-00C00C205365
// ASF_Stream_Properties_Object // B7DC0791-A9B7-11CF-8EE6-00C00C205365
static const unsigned char asf_file_prop_id[16]= {
0xa1, 0xdc, 0xab, 0x8c, 0x47, 0xa9, 0xcf, 0x11,
0x8e, 0xe4, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65
};
static const unsigned char asf_stream_prop_s[16]= {
0x91, 0x07, 0xdc, 0xb7, 0xb7, 0xa9, 0xcf, 0x11,
0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65
};
if(object_size < 0x18)
{
#ifndef DISABLED_FOR_FRAMAC
log_info("header_check_asf object_size too small %llu\n", (long long unsigned)object_size);
#endif
return 0;
}
if(object_size > 0x8000000000000000)
return 0;
if(memcmp(prop->object_id, asf_file_prop_id, sizeof(asf_file_prop_id))==0)
{
if(object_size < 0x28)
return 0;
size=le64(prop->file_size);
if(size < sizeof(struct asf_header_obj_s) + sizeof(struct asf_file_prop_s))
return 0;
time=td_ntfs2utc(le64(prop->file_date));
}
else if(memcmp(prop->object_id, asf_stream_prop_s, sizeof(asf_stream_prop_s))==0)
{
const struct asf_stream_prop_s *stream=(const struct asf_stream_prop_s *)prop;
const unsigned char wma[16]={
0x40, 0x9e, 0x69, 0xf8, 0x4d, 0x5b, 0xcf, 0x11, 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b
};
const unsigned char wmv[16]={
0xc0, 0xef, 0x19, 0xbc, 0x4d, 0x5b, 0xcf, 0x11, 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b
};
if(object_size < 0x28)
return 0;
if(memcmp(stream->stream_type, wma, sizeof(wma))==0)
extension=extension_wma;
else if(memcmp(stream->stream_type, wmv, sizeof(wmv))==0)
extension=extension_wmv;
}
offset_prop+=object_size;
}
if(size > 0 && size < offset_prop)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=extension;
file_recovery_new->min_filesize=offset_prop;
file_recovery_new->time=time;
if(size > 0)
{
file_recovery_new->calculated_file_size=size;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
}
return 1;
}
static void register_header_check_asf(file_stat_t *file_stat)
{
static const unsigned char asf_header[16]= {
0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66, 0xcf, 0x11,
0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
};
register_header_check(0, asf_header,sizeof(asf_header), &header_check_asf, file_stat);
}
#endif
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