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/*
File: file_iso.c
Copyright (C) 2008 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_iso)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
#include "iso9660.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_iso(file_stat_t *file_stat);
const file_hint_t file_hint_iso= {
.extension="iso",
.description="ISO",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_iso
};
/*@
@ requires separation: \separated(&file_hint_iso, 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_iso(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_size<0x8000+512) /* +2048 for the full mapping */
return 0;
{
const struct iso_primary_descriptor *iso1=(const struct iso_primary_descriptor*)&buffer[0x8000];
const unsigned int volume_space_size_le=le32(iso1->volume_space_size_le);
const unsigned int volume_space_size_be=be32(iso1->volume_space_size_be);
const unsigned int logical_block_size_le=le16(iso1->logical_block_size_le);
const unsigned int logical_block_size_be=be16(iso1->logical_block_size_be);
if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
{ /* ISO 9660 */
const uint64_t size=(uint64_t)volume_space_size_le * logical_block_size_le;
if(size < 0x8000+512)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_iso.extension;
file_recovery_new->calculated_file_size=size;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
file_recovery_new->min_filesize=0x8000+512;
return 1;
}
}
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_iso.extension;
file_recovery_new->min_filesize=0x8000+512;
return 1;
}
static void register_header_check_iso(file_stat_t *file_stat)
{
static const unsigned char iso_header[6]= { 0x01, 'C', 'D', '0', '0', '1'};
register_header_check(0x8000, iso_header,sizeof(iso_header), &header_check_iso, file_stat);
}
#endif
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