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4c0f0bb2 PL |
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" | |
4c0f0bb2 PL |
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 | ||
dc325678 PL |
38 | static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = { |
39 | NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0 | |
40 | }; | |
41 | ||
79cb8ced | 42 | #ifndef CONFIG_SQUASHFS_LZO |
01a678c5 | 43 | static const struct squashfs_decompressor squashfs_lzo_comp_ops = { |
dc325678 PL |
44 | NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0 |
45 | }; | |
79cb8ced | 46 | #endif |
dc325678 | 47 | |
7a43ae52 PL |
48 | #ifndef CONFIG_SQUASHFS_XZ |
49 | static const struct squashfs_decompressor squashfs_xz_comp_ops = { | |
50 | NULL, NULL, NULL, XZ_COMPRESSION, "xz", 0 | |
51 | }; | |
52 | #endif | |
53 | ||
4c0f0bb2 PL |
54 | static const struct squashfs_decompressor squashfs_unknown_comp_ops = { |
55 | NULL, NULL, NULL, 0, "unknown", 0 | |
56 | }; | |
57 | ||
58 | static const struct squashfs_decompressor *decompressor[] = { | |
59 | &squashfs_zlib_comp_ops, | |
79cb8ced | 60 | &squashfs_lzo_comp_ops, |
7a43ae52 | 61 | &squashfs_xz_comp_ops, |
01a678c5 | 62 | &squashfs_lzma_unsupported_comp_ops, |
4c0f0bb2 PL |
63 | &squashfs_unknown_comp_ops |
64 | }; | |
65 | ||
66 | ||
67 | const 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 | } |