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/*
File: iso.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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "types.h"
#include "common.h"
#include "iso9660.h"
#include "iso.h"
#include "fnctdsk.h"
#include "log.h"
#include "guid_cpy.h"
/*@
@ requires \valid_read(iso);
@ requires \valid(partition);
@ requires valid_partition(partition);
@ requires \separated(iso, partition);
@*/
static void set_ISO_info(const struct iso_primary_descriptor *iso, partition_t *partition);
/*@
@ requires \valid_read(iso);
@ assigns \nothing;
@*/
static int test_ISO(const struct iso_primary_descriptor *iso)
{
static const unsigned char iso_header[6]= { 0x01, 'C', 'D', '0', '0', '1'};
if(memcmp(iso, iso_header, sizeof(iso_header))!=0)
return 1;
return 0;
}
int check_ISO(disk_t *disk_car, partition_t *partition)
{
unsigned char *buffer=(unsigned char*)MALLOC(ISO_PD_SIZE);
/*@ assert \valid(buffer + (0 .. ISO_PD_SIZE-1)); */
if(disk_car->pread(disk_car, buffer, ISO_PD_SIZE, partition->part_offset + 64 * 512) != ISO_PD_SIZE)
{
free(buffer);
return 1;
}
if(test_ISO((struct iso_primary_descriptor*)buffer)!=0)
{
free(buffer);
return 1;
}
set_ISO_info((struct iso_primary_descriptor*)buffer, partition);
free(buffer);
return 0;
}
static void set_ISO_info(const struct iso_primary_descriptor *iso, partition_t *partition)
{
const unsigned int volume_space_size_le=le32(iso->volume_space_size_le);
const unsigned int volume_space_size_be=be32(iso->volume_space_size_be);
const unsigned int logical_block_size_le=le16(iso->logical_block_size_le);
const unsigned int logical_block_size_be=be16(iso->logical_block_size_be);
partition->upart_type=UP_ISO;
set_part_name_chomp(partition, (const char*)iso->volume_id, 32);
if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
{
partition->blocksize=logical_block_size_le;
snprintf(partition->info, sizeof(partition->info),
"ISO9660 blocksize=%u", partition->blocksize);
}
else
snprintf(partition->info, sizeof(partition->info), "ISO");
}
int recover_ISO(const struct iso_primary_descriptor *iso, partition_t *partition)
{
if(test_ISO(iso)!=0)
return 1;
set_ISO_info(iso, partition);
/*@ assert \valid_read(iso); */
/*@ assert \valid(partition); */
{
const unsigned int volume_space_size_le=le32(iso->volume_space_size_le);
const unsigned int volume_space_size_be=be32(iso->volume_space_size_be);
const unsigned int logical_block_size_le=le16(iso->logical_block_size_le);
const unsigned int logical_block_size_be=be16(iso->logical_block_size_be);
if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
{ /* ISO 9660 */
partition->part_size=(uint64_t)volume_space_size_le * logical_block_size_le;
}
}
return 0;
}
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