Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Squashfs - a compressed read only filesystem for Linux
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
5 * Phillip Lougher <phillip@lougher.demon.co.uk>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2,
10 * or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 *
21 * decompressor.c
22 */
23
24#include <linux/types.h>
25#include <linux/mutex.h>
26#include <linux/buffer_head.h>
27
28#include "squashfs_fs.h"
29#include "squashfs_fs_sb.h"
30#include "decompressor.h"
31#include "squashfs.h"
32
33/*
34 * This file (and decompressor.h) implements a decompressor framework for
35 * Squashfs, allowing multiple decompressors to be easily supported
36 */
37
38static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
39 NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
40};
41
42#ifndef CONFIG_SQUASHFS_LZO
43static const struct squashfs_decompressor squashfs_lzo_comp_ops = {
44 NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
45};
46#endif
47
48#ifndef CONFIG_SQUASHFS_XZ
49static const struct squashfs_decompressor squashfs_xz_comp_ops = {
50 NULL, NULL, NULL, XZ_COMPRESSION, "xz", 0
51};
52#endif
53
54static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
55 NULL, NULL, NULL, 0, "unknown", 0
56};
57
58static const struct squashfs_decompressor *decompressor[] = {
59 &squashfs_zlib_comp_ops,
60 &squashfs_lzo_comp_ops,
61 &squashfs_xz_comp_ops,
62 &squashfs_lzma_unsupported_comp_ops,
63 &squashfs_unknown_comp_ops
64};
65
66
67const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
68{
69 int i;
70
71 for (i = 0; decompressor[i]->id; i++)
72 if (id == decompressor[i]->id)
73 break;
74
75 return decompressor[i];
76}