1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2006 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 *	This program is free software; you can redistribute it and/or modify it
7 *	under the terms of the GNU General Public License as published by the
8 *	Free Software Foundation version 2 of the License.
9 */
10
11#ifndef _GNU_SOURCE
12#define _GNU_SOURCE 1
13#endif
14
15#ifdef HAVE_CONFIG_H
16#  include <config.h>
17#endif
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <unistd.h>
22#include <string.h>
23#include <errno.h>
24#include <ctype.h>
25
26#include "libvolume_id.h"
27#include "util.h"
28
29#define SQUASHFS_MAGIC		0x73717368
30
31struct squashfs_super {
32	uint32_t		s_magic;
33} PACKED;
34
35int volume_id_probe_squashfs(struct volume_id *id, uint64_t off, uint64_t size)
36{
37	struct squashfs_super *sqs;
38
39	info("probing at offset 0x%llx", (unsigned long long) off);
40
41	sqs = (struct squashfs_super *) volume_id_get_buffer(id, off + 0x200, 0x200);
42	if (sqs == NULL)
43		return -1;
44
45	if (sqs->s_magic == SQUASHFS_MAGIC || sqs->s_magic == bswap_32(SQUASHFS_MAGIC)) {
46		volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
47		id->type = "squashfs";
48		return 0;
49	}
50
51	return -1;
52}
53