summaryrefslogtreecommitdiffstats
path: root/fs/squashfs/decompressor.c
blob: 50b22d330cecde8988db0d485ddb836cc036de06 (plain)
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
72
73
74
75
76
77
78
79
80
/*
 * Squashfs - a compressed read only filesystem for Linux
 *
 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
 * Phillip Lougher <phillip@lougher.demon.co.uk>
 *
 * 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,
 * 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 to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * decompressor.c
 */

#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/buffer_head.h>

#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "decompressor.h"
#include "squashfs.h"

/*
 * This file (and decompressor.h) implements a decompressor framework for
 * Squashfs, allowing multiple decompressors to be easily supported
 */

static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
	NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
};

#ifndef CONFIG_SQUASHFS_LZO
static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
	NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
};
#endif

#ifndef CONFIG_SQUASHFS_XZ
static const struct squashfs_decompressor squashfs_xz_comp_ops = {
	NULL, NULL, NULL, XZ_COMPRESSION, "xz", 0
};
#endif

static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
	NULL, NULL, NULL, 0, "unknown", 0
};

static const struct squashfs_decompressor *decompressor[] = {
	&squashfs_zlib_comp_ops,
	&squashfs_lzma_unsupported_comp_ops,
#ifdef CONFIG_SQUASHFS_LZO
	&squashfs_lzo_comp_ops,
#else
	&squashfs_lzo_unsupported_comp_ops,
#endif
	&squashfs_xz_comp_ops,
	&squashfs_unknown_comp_ops
};


const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
{
	int i;

	for (i = 0; decompressor[i]->id; i++)
		if (id == decompressor[i]->id)
			break;

	return decompressor[i];
}
OpenPOWER on IntegriCloud