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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" | |
30 | #include "squashfs_fs_i.h" | |
31 | #include "decompressor.h" | |
32 | #include "squashfs.h" | |
33 | ||
34 | /* | |
35 | * This file (and decompressor.h) implements a decompressor framework for | |
36 | * Squashfs, allowing multiple decompressors to be easily supported | |
37 | */ | |
38 | ||
dc325678 PL |
39 | static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = { |
40 | NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0 | |
41 | }; | |
42 | ||
43 | static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = { | |
44 | NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0 | |
45 | }; | |
46 | ||
4c0f0bb2 PL |
47 | static const struct squashfs_decompressor squashfs_unknown_comp_ops = { |
48 | NULL, NULL, NULL, 0, "unknown", 0 | |
49 | }; | |
50 | ||
51 | static const struct squashfs_decompressor *decompressor[] = { | |
52 | &squashfs_zlib_comp_ops, | |
dc325678 PL |
53 | &squashfs_lzma_unsupported_comp_ops, |
54 | &squashfs_lzo_unsupported_comp_ops, | |
4c0f0bb2 PL |
55 | &squashfs_unknown_comp_ops |
56 | }; | |
57 | ||
58 | ||
59 | const struct squashfs_decompressor *squashfs_lookup_decompressor(int id) | |
60 | { | |
61 | int i; | |
62 | ||
63 | for (i = 0; decompressor[i]->id; i++) | |
64 | if (id == decompressor[i]->id) | |
65 | break; | |
66 | ||
67 | return decompressor[i]; | |
68 | } |