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/*
File: file_r3d.c
Copyright (C) 2009,2014 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_r3d)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include <ctype.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_r3d(file_stat_t *file_stat);
const file_hint_t file_hint_r3d = {
.extension = "r3d",
.description = "RED r3d camera",
.max_filesize = PHOTOREC_MAX_FILE_SIZE,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_r3d
};
struct atom_struct
{
uint32_t size;
uint32_t type;
} __attribute__((gcc_struct, __packed__));
/*@
@ requires file_recovery->data_check==&data_check_r3d;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ terminates \true;
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size, file_recovery->data_check;
@*/
static data_check_t data_check_r3d(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; */
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size / 2 - (file_recovery->calculated_file_size + 8);
@*/
while(file_recovery->calculated_file_size + buffer_size / 2 >= file_recovery->file_size && file_recovery->calculated_file_size + 8 <= 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-8; */
const struct atom_struct *atom = (const struct atom_struct *)&buffer[i];
uint64_t atom_size = be32(atom->size);
if(atom_size < 8)
return DC_STOP;
#ifdef DEBUG_R3D
log_trace("file_r3d.c: %s atom %c%c%c%c (0x%02x%02x%02x%02x) size %llu, calculated_file_size %llu\n",
file_recovery->filename,
buffer[i + 4], buffer[i + 5], buffer[i + 6], buffer[i + 7],
buffer[i + 4], buffer[i + 5], buffer[i + 6], buffer[i + 7],
(long long unsigned)atom_size,
(long long unsigned)file_recovery->calculated_file_size);
#endif
if(buffer[i + 4] == 'R' && buffer[i + 5] == 'E' && buffer[i + 6] == 'O')
{
/* End of file */
file_recovery->calculated_file_size += atom_size;
file_recovery->data_check = NULL;
return DC_CONTINUE;
}
if(buffer[i + 4] != 'R')
{
return DC_STOP;
}
/* REDV1 REDV RPAD RDVO RDVS RDAO RDAS REOB */
file_recovery->calculated_file_size += atom_size;
}
#ifdef DEBUG_R3D
log_trace("file_r3d.c: new calculated_file_size %llu\n",
(long long unsigned)file_recovery->calculated_file_size);
#endif
return DC_CONTINUE;
}
/*@
@ requires file_recovery->file_rename==&file_rename_r3d;
@ requires valid_file_rename_param(file_recovery);
@ ensures valid_file_rename_result(file_recovery);
@*/
static void file_rename_r3d(file_recovery_t *file_recovery)
{
unsigned char buffer[512];
FILE *file;
size_t buffer_size;
unsigned int i;
if((file = fopen(file_recovery->filename, "rb")) == NULL)
return;
buffer_size = fread(buffer, 1, sizeof(buffer), file);
fclose(file);
if(buffer_size < 0x44)
return;
/*@
@ loop assigns i;
@ loop variant buffer_size - i;
@*/
for(i = 0x43; i < buffer_size && buffer[i] != 0 && buffer[i] != '.'; i++)
{
if(!isalnum(buffer[i]) && buffer[i] != '_')
return;
}
file_rename(file_recovery, buffer, i, 0x43, NULL, 1);
}
/*@
@ requires buffer_size >= sizeof(struct atom_struct);
@ requires separation: \separated(&file_hint_r3d, 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_r3d(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 atom_struct *atom = (const struct atom_struct *)buffer;
if(be32(atom->size) < 8)
return 0;
if(buffer[0xa] == 'R' && buffer[0xb] == '1')
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_r3d.extension;
file_recovery_new->file_rename = &file_rename_r3d;
if(file_recovery_new->blocksize < 8)
return 1;
file_recovery_new->data_check = &data_check_r3d;
file_recovery_new->file_check = &file_check_size;
return 1;
}
return 0;
}
/*@
@ requires buffer_size >= 0xc;
@ requires separation: \separated(&file_hint_r3d, 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_r3d_v2(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)
{
if(buffer[0xa] == 'R' && buffer[0xb] == '2')
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_r3d.extension;
return 1;
}
return 0;
}
static void register_header_check_r3d(file_stat_t *file_stat)
{
static const unsigned char r3d_header1[4] = { 'R', 'E', 'D', '1' };
static const unsigned char r3d_header2[4] = { 'R', 'E', 'D', '2' };
register_header_check(4, r3d_header1, sizeof(r3d_header1), &header_check_r3d, file_stat);
register_header_check(4, r3d_header2, sizeof(r3d_header2), &header_check_r3d_v2, file_stat);
}
#endif
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