112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/*
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File: iso.c
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Copyright (C) 2009 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "types.h"
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#include "common.h"
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#include "iso9660.h"
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#include "iso.h"
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#include "fnctdsk.h"
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#include "log.h"
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#include "guid_cpy.h"
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/*@
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@ requires \valid_read(iso);
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@ requires \valid(partition);
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@ requires valid_partition(partition);
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@ requires \separated(iso, partition);
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@*/
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static void set_ISO_info(const struct iso_primary_descriptor *iso, partition_t *partition);
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/*@
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@ requires \valid_read(iso);
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@ assigns \nothing;
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@*/
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static int test_ISO(const struct iso_primary_descriptor *iso)
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{
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static const unsigned char iso_header[6]= { 0x01, 'C', 'D', '0', '0', '1'};
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if(memcmp(iso, iso_header, sizeof(iso_header))!=0)
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return 1;
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return 0;
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}
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int check_ISO(disk_t *disk_car, partition_t *partition)
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{
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unsigned char *buffer=(unsigned char*)MALLOC(ISO_PD_SIZE);
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if(disk_car->pread(disk_car, buffer, ISO_PD_SIZE, partition->part_offset + 64 * 512) != ISO_PD_SIZE)
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{
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free(buffer);
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return 1;
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}
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if(test_ISO((struct iso_primary_descriptor*)buffer)!=0)
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{
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free(buffer);
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return 1;
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}
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set_ISO_info((struct iso_primary_descriptor*)buffer, partition);
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free(buffer);
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return 0;
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}
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static void set_ISO_info(const struct iso_primary_descriptor *iso, partition_t *partition)
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{
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const unsigned int volume_space_size_le=le32(iso->volume_space_size_le);
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const unsigned int volume_space_size_be=be32(iso->volume_space_size_be);
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const unsigned int logical_block_size_le=le16(iso->logical_block_size_le);
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const unsigned int logical_block_size_be=be16(iso->logical_block_size_be);
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partition->upart_type=UP_ISO;
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set_part_name_chomp(partition, (const char*)iso->volume_id, 32);
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if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
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{
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partition->blocksize=logical_block_size_le;
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snprintf(partition->info, sizeof(partition->info),
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"ISO9660 blocksize=%u", partition->blocksize);
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}
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else
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snprintf(partition->info, sizeof(partition->info), "ISO");
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}
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int recover_ISO(const struct iso_primary_descriptor *iso, partition_t *partition)
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{
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if(test_ISO(iso)!=0)
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return 1;
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set_ISO_info(iso, partition);
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{
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const unsigned int volume_space_size_le=le32(iso->volume_space_size_le);
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const unsigned int volume_space_size_be=be32(iso->volume_space_size_be);
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const unsigned int logical_block_size_le=le16(iso->logical_block_size_le);
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const unsigned int logical_block_size_be=be16(iso->logical_block_size_be);
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if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
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{ /* ISO 9660 */
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partition->part_size=(uint64_t)volume_space_size_le * logical_block_size_le;
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}
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}
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return 0;
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}
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