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/*
File: exfat.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
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "exfat.h"
#include "log.h"
extern const arch_fnct_t arch_none;
uint64_t exfat_cluster_to_offset(const struct exfat_super_block *exfat_header, const unsigned int cluster)
{
return ((uint64_t)(((cluster-2) << exfat_header->block_per_clus_bits) + le32(exfat_header->clus_blocknr))) << exfat_header->blocksize_bits;
}
int exfat_read_cluster(disk_t *disk, const partition_t *partition, const struct exfat_super_block*exfat_header, void *buffer, const unsigned int cluster)
{
return disk->pread(disk,
buffer,
1 << (exfat_header->block_per_clus_bits + exfat_header->blocksize_bits),
partition->part_offset + exfat_cluster_to_offset(exfat_header, cluster));
}
/*@
@ requires \valid(partition);
@ requires \valid_read(exfat_header);
@ requires \separated(partition, exfat_header);
@*/
static void set_exFAT_info(partition_t *partition, const struct exfat_super_block*exfat_header)
{
partition->upart_type=UP_EXFAT;
partition->blocksize=1<<(exfat_header->block_per_clus_bits + exfat_header->blocksize_bits);
partition->fsname[0]='\0';
if(partition->sb_offset==0)
snprintf(partition->info, sizeof(partition->info), "exFAT, blocksize=%u", partition->blocksize);
else
snprintf(partition->info, sizeof(partition->info), "exFAT found using backup sector, blocksize=%u", partition->blocksize);
}
int check_exFAT(disk_t *disk, partition_t *partition)
{
unsigned char *buffer=(unsigned char*)MALLOC(EXFAT_BS_SIZE);
if(disk->pread(disk, buffer, EXFAT_BS_SIZE, partition->part_offset) != EXFAT_BS_SIZE)
{
free(buffer);
return 1;
}
if(test_exFAT((struct exfat_super_block*)buffer)!=0)
{
free(buffer);
return 1;
}
set_exFAT_info(partition, (struct exfat_super_block*)buffer);
free(buffer);
return 0;
}
int test_exFAT(const struct exfat_super_block *exfat_header)
{
if(le16(exfat_header->signature)!=0xAA55)
return 1;
if(memcmp(exfat_header->oem_id, "EXFAT ", sizeof(exfat_header->oem_id))!=0)
return 1;
return 0;
}
int recover_exFAT(const disk_t *disk, const struct exfat_super_block *exfat_header, partition_t *partition)
{
if(test_exFAT(exfat_header)!=0)
return 1;
partition->sborg_offset=0;
partition->sb_size=12 << exfat_header->blocksize_bits;
partition->part_type_i386=P_EXFAT;
partition->part_type_gpt=GPT_ENT_TYPE_MS_BASIC_DATA;
partition->part_size=(uint64_t)le64(exfat_header->nr_sectors) * disk->sector_size;
#ifdef DEBUG_exFAT
log_info("recover_exFAT:\n");
log_info("start_sector=%llu\n", (long long unsigned)le64(exfat_header->start_sector));
log_info("blocksize=%u\n", (12<<exfat_header->blocksize_bits));
log_info("part_offset=%llu\n", partition->part_offset);
#endif
if((le64(exfat_header->start_sector) * disk ->sector_size +
(12 << exfat_header->blocksize_bits) == partition->part_offset) ||
(disk->arch==&arch_none && ((uint64_t)12 << exfat_header->blocksize_bits) == partition->part_offset))
{
partition->sb_offset=12 << exfat_header->blocksize_bits;
partition->part_offset-=partition->sb_offset;
}
set_exFAT_info(partition, exfat_header);
return 0;
}
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