1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2006 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 version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "libvolume_id.h"
#include "util.h"
#define SQUASHFS_MAGIC 0x73717368
#define SQUASHFS_MAGIC_LZMA 0x71736873
struct squashfs_super {
uint32_t s_magic;
uint32_t inodes;
uint32_t bytes_used_2;
uint32_t uid_start_2;
uint32_t guid_start_2;
uint32_t inode_table_start_2;
uint32_t directory_table_start_2;
uint16_t s_major;
uint16_t s_minor;
} PACKED;
int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t size)
{
struct squashfs_super *sqs;
info("probing at offset 0x%llx\n", (unsigned long long) off);
sqs = (struct squashfs_super *) volume_id_get_buffer(id, off, 0x200);
if (sqs == NULL)
return -1;
if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == SQUASHFS_MAGIC_LZMA) {
snprintf(id->type_version, sizeof(id->type_version), "%u.%u",
sqs->s_major, sqs->s_minor);
goto found;
}
if (sqs->s_magic == bswap_32(SQUASHFS_MAGIC) || sqs->s_magic == bswap_32(SQUASHFS_MAGIC_LZMA)) {
snprintf(id->type_version, sizeof(id->type_version), "%u.%u",
bswap_16(sqs->s_major), bswap_16(sqs->s_minor));
goto found;
}
return -1;
found:
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
id->type = "squashfs";
return 0;
}
|
