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/*
File: file_mxf.c
Copyright (C) 2009 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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_mxf)
#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"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_mxf(file_stat_t *file_stat);
const file_hint_t file_hint_mxf= {
.extension="mxf",
.description="Material Exchange Format",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_mxf
};
/* http://tools.ietf.org/html/rfc4539
* Media Type Registration for the
* Society of Motion Picture and Television Engineers (SMPTE)
* Material Exchange Format (MXF)
* */
struct partition_pack_next
{
uint16_t major_version;
uint16_t minor_version;
uint32_t kagsize;
uint64_t this_partition;
uint64_t previous_partition;
uint64_t footer_partition;
uint64_t header_byte_count;
uint64_t index_byte_count;
uint32_t index_SID;
uint64_t body_offset;
uint32_t body_SID;
char op_pattern[16];
#ifndef DISABLED_FOR_FRAMAC
char essence_container[0];
#endif
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires \valid_read(buffer + (0 .. buffer_size-1));
@ requires 0 <= i < buffer_size - 0x14;
@ terminates \true;
@ ensures \result > 0;
@ assigns \nothing;
@*/
static uint64_t get_mxf_size(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int i)
{
switch(buffer[i+0x10])
{
case 0x81:
return (uint64_t)0x14+buffer[i+0x11];
case 0x82:
return (uint64_t)0x14+(buffer[i+0x11]<<8)+buffer[i+0x12];
case 0x83:
return (uint64_t)0x14+(buffer[i+0x11]<<16)+(buffer[i+0x12]<<8)+buffer[i+0x13];
case 0x84:
{
const uint32_t *p32=(const uint32_t*)&buffer[i+0x11];
return (uint64_t)0x14 + le32(*p32);
}
default:
return (uint64_t)0x14+buffer[i+0x10];
}
}
/*@
@ requires file_recovery->data_check==&data_check_mxf;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_mxf(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
static const unsigned char mxf_header[4]= { 0x06, 0x0e, 0x2b, 0x34 };
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size/2 - (file_recovery->calculated_file_size + 0x14);
@*/
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 0x14 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 0x14; */
if(memcmp(&buffer[i], mxf_header, sizeof(mxf_header))!=0)
return DC_STOP;
#ifdef DEBUG_MXF
log_info("data_check_mxf: header found 0x%02x\n", buffer[i+0x10]);
log_info("fs=0x%llx\n", file_recovery->calculated_file_size);
#endif
file_recovery->calculated_file_size+=get_mxf_size(buffer, buffer_size, i);
}
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= 0x26;
@ requires separation: \separated(&file_hint_mxf, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_mxf(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 partition_pack_next *hdr;
if(buffer[0x0d]!=0x02 || buffer[0x0e]!=0x04)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_mxf.extension;
switch(buffer[0x10])
{
case 0x81:
hdr=(const struct partition_pack_next *)&buffer[0x12];
break;
case 0x82:
hdr=(const struct partition_pack_next *)&buffer[0x13];
break;
case 0x83:
hdr=(const struct partition_pack_next *)&buffer[0x14];
break;
case 0x84:
hdr=(const struct partition_pack_next *)&buffer[0x15];
break;
default:
hdr=(const struct partition_pack_next *)&buffer[0x11];
break;
}
file_recovery_new->calculated_file_size=be64(hdr->footer_partition);
file_recovery_new->data_check=&data_check_mxf;
file_recovery_new->file_check=&file_check_size;
return 1;
}
static void register_header_check_mxf(file_stat_t *file_stat)
{
static const unsigned char mxf_header[11]= {
0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01,
0x0d, 0x01, 0x02
};
register_header_check(0, mxf_header,sizeof(mxf_header), &header_check_mxf, file_stat);
}
#endif
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