mirror of
https://github.com/AuxXxilium/eudev.git
synced 2025-01-25 16:40:31 +07:00
43f7e87f54
* fix typo (hs vs. hbb) * set id->{version,usage,type} when all tests pass * be paranoid and don't use hs->version when "hs" source buffer was possibly modified by next volume_id_get_buffer() call. Signed-off-by: Karel Zak <kzak@redhat.com>
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/*
|
|
* volume_id - reads filesystem label and uuid
|
|
*
|
|
* Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
|
|
*
|
|
* This program 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE 1
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <ctype.h>
|
|
|
|
#include "libvolume_id.h"
|
|
#include "libvolume_id-private.h"
|
|
|
|
struct hpfs_boot_block
|
|
{
|
|
uint8_t jmp[3];
|
|
uint8_t oem_id[8];
|
|
uint8_t bytes_per_sector[2];
|
|
uint8_t sectors_per_cluster;
|
|
uint8_t n_reserved_sectors[2];
|
|
uint8_t n_fats;
|
|
uint8_t n_rootdir_entries[2];
|
|
uint8_t n_sectors_s[2];
|
|
uint8_t media_byte;
|
|
uint16_t sectors_per_fat;
|
|
uint16_t sectors_per_track;
|
|
uint16_t heads_per_cyl;
|
|
uint32_t n_hidden_sectors;
|
|
uint32_t n_sectors_l;
|
|
uint8_t drive_number;
|
|
uint8_t mbz;
|
|
uint8_t sig_28h;
|
|
uint8_t vol_serno[4];
|
|
uint8_t vol_label[11];
|
|
uint8_t sig_hpfs[8];
|
|
uint8_t pad[448];
|
|
uint8_t magic[2];
|
|
} PACKED;
|
|
|
|
struct hpfs_super
|
|
{
|
|
uint8_t magic[4];
|
|
uint8_t magic1[4];
|
|
uint8_t version;
|
|
} PACKED;
|
|
|
|
|
|
struct hpfs_spare_super
|
|
{
|
|
uint8_t magic[4];
|
|
uint8_t magic1[4];
|
|
} PACKED;
|
|
|
|
#define HPFS_SUPERBLOCK_OFFSET 0x2000
|
|
#define HPFS_SUPERBLOCK_SPARE_OFFSET 0x2200
|
|
|
|
int volume_id_probe_hpfs(struct volume_id *id, uint64_t off, uint64_t size)
|
|
{
|
|
struct hpfs_super *hs;
|
|
struct hpfs_spare_super *hss;
|
|
struct hpfs_boot_block *hbb;
|
|
uint8_t version;
|
|
|
|
info("probing at offset 0x%" PRIx64 "\n", off);
|
|
|
|
hs = (struct hpfs_super *) volume_id_get_buffer(id, off + HPFS_SUPERBLOCK_OFFSET, 0x400);
|
|
if (hs == NULL)
|
|
return -1;
|
|
if (memcmp(hs->magic, "\x49\xe8\x95\xf9", 4) != 0)
|
|
return -1;
|
|
|
|
hss = (struct hpfs_spare_super *) volume_id_get_buffer(id, off + HPFS_SUPERBLOCK_SPARE_OFFSET, 0x200);
|
|
if (hss == NULL)
|
|
return -1;
|
|
if (memcmp(hss->magic, "\x49\x18\x91\xf9", 4) != 0)
|
|
return -1;
|
|
|
|
version = hs->version;
|
|
|
|
/* if boot block looks valid, read label and uuid from there */
|
|
hbb = (struct hpfs_boot_block *) volume_id_get_buffer(id, off, 0x200);
|
|
if (hbb == NULL)
|
|
return -1;
|
|
if (memcmp(hbb->magic, "\x55\xaa", 2) == 0 &&
|
|
memcmp(hbb->sig_hpfs, "HPFS", 4) == 0 &&
|
|
hbb->sig_28h == 0x28) {
|
|
volume_id_set_label_raw(id, hbb->vol_label, 11);
|
|
volume_id_set_label_string(id, hbb->vol_label, 11);
|
|
volume_id_set_uuid(id, hbb->vol_serno, 0, UUID_DOS);
|
|
}
|
|
sprintf(id->type_version, "%u", version);
|
|
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
|
|
id->type = "hpfs";
|
|
|
|
return 0;
|
|
}
|