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/*
File: file_oci.c
Copyright (C) 2011 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_oci)
#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"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_oci(file_stat_t *file_stat);
const file_hint_t file_hint_oci= {
.extension="oci",
.description="OpenCanvas Image",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_oci
};
struct oci_header
{
unsigned char type[4];
uint32_t size;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->data_check==&data_check_oci;
@ 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_oci(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ loop assigns file_recovery->calculated_file_size; */
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 oci_header *hdr=(const struct oci_header *)&buffer[i];
const unsigned int atom_size=le32(hdr->size);
#ifdef DEBUG_MOV
log_trace("file_oci.c: %s atom %c%c%c%c (0x%02x%02x%02x%02x) size %llu, calculated_file_size %llu\n",
file_recovery->filename,
buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
(long long unsigned)atom_size,
(long long unsigned)file_recovery->calculated_file_size);
#endif
if(buffer[i+0]=='O' &&
(buffer[i+1]>='A' && buffer[i+1]<='Z') &&
(buffer[i+2]>='A' && buffer[i+2]<='Z') &&
(buffer[i+3]>='A' && buffer[i+3]<='Z'))
{
file_recovery->calculated_file_size+=(uint64_t)8+atom_size;
}
else
{
return DC_STOP;
}
}
#ifdef DEBUG_MOV
log_trace("file_oci.c: new calculated_file_size %llu\n",
(long long unsigned)file_recovery->calculated_file_size);
#endif
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= sizeof(struct oci_header);
@ requires separation: \separated(&file_hint_oci, 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_oci(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 oci_header *hdr=(const struct oci_header *)buffer;
const unsigned int size=le32(hdr->size);
if(size >= 0x0fffffff0)
return 0;
if(8+size+8 <= buffer_size)
{
const struct oci_header *hdr2=(const struct oci_header *)&buffer[8+size];
if(!(hdr2->type[0]=='O' &&
(hdr2->type[1]>='A' && hdr2->type[1]<='Z') &&
(hdr2->type[2]>='A' && hdr2->type[2]<='Z') &&
(hdr2->type[3]>='A' && hdr2->type[3]<='Z')))
return 0;
}
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_oci.extension;
if(file_recovery_new->blocksize < 8)
return 1;
file_recovery_new->data_check=&data_check_oci;
file_recovery_new->file_check=&file_check_size;
return 1;
}
static void register_header_check_oci(file_stat_t *file_stat)
{
static const unsigned char oci_header[8]= {
'O' , 'P' , 'I' , 'M' , '0' , 0x00, 0x00, 0x00
};
register_header_check(0, oci_header, sizeof(oci_header), &header_check_oci, file_stat);
}
#endif
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