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79cb8ced CJ |
1 | /* |
2 | * Squashfs - a compressed read only filesystem for Linux | |
3 | * | |
4 | * Copyright (c) 2010 LG Electronics | |
5 | * Chan Jeong <chan.jeong@lge.com> | |
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 | * lzo_wrapper.c | |
22 | */ | |
23 | ||
24 | #include <linux/mutex.h> | |
25 | #include <linux/buffer_head.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/lzo.h> | |
29 | ||
30 | #include "squashfs_fs.h" | |
31 | #include "squashfs_fs_sb.h" | |
79cb8ced CJ |
32 | #include "squashfs.h" |
33 | #include "decompressor.h" | |
34 | ||
35 | struct squashfs_lzo { | |
36 | void *input; | |
37 | void *output; | |
38 | }; | |
39 | ||
9508c6b9 | 40 | static void *lzo_init(struct squashfs_sb_info *msblk, void *buff) |
79cb8ced | 41 | { |
f3065f60 PL |
42 | int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); |
43 | ||
79cb8ced CJ |
44 | struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL); |
45 | if (stream == NULL) | |
46 | goto failed; | |
f3065f60 | 47 | stream->input = vmalloc(block_size); |
79cb8ced CJ |
48 | if (stream->input == NULL) |
49 | goto failed; | |
f3065f60 | 50 | stream->output = vmalloc(block_size); |
79cb8ced CJ |
51 | if (stream->output == NULL) |
52 | goto failed2; | |
53 | ||
54 | return stream; | |
55 | ||
56 | failed2: | |
57 | vfree(stream->input); | |
58 | failed: | |
59 | ERROR("Failed to allocate lzo workspace\n"); | |
60 | kfree(stream); | |
b7fc0ff0 | 61 | return ERR_PTR(-ENOMEM); |
79cb8ced CJ |
62 | } |
63 | ||
64 | ||
65 | static void lzo_free(void *strm) | |
66 | { | |
67 | struct squashfs_lzo *stream = strm; | |
68 | ||
69 | if (stream) { | |
70 | vfree(stream->input); | |
71 | vfree(stream->output); | |
72 | } | |
73 | kfree(stream); | |
74 | } | |
75 | ||
76 | ||
9508c6b9 PL |
77 | static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm, |
78 | void **buffer, struct buffer_head **bh, int b, int offset, int length, | |
79 | int srclength, int pages) | |
79cb8ced | 80 | { |
9508c6b9 | 81 | struct squashfs_lzo *stream = strm; |
79cb8ced CJ |
82 | void *buff = stream->input; |
83 | int avail, i, bytes = length, res; | |
f3065f60 | 84 | size_t out_len = srclength; |
79cb8ced | 85 | |
79cb8ced | 86 | for (i = 0; i < b; i++) { |
79cb8ced CJ |
87 | avail = min(bytes, msblk->devblksize - offset); |
88 | memcpy(buff, bh[i]->b_data + offset, avail); | |
89 | buff += avail; | |
90 | bytes -= avail; | |
91 | offset = 0; | |
92 | put_bh(bh[i]); | |
93 | } | |
94 | ||
95 | res = lzo1x_decompress_safe(stream->input, (size_t)length, | |
96 | stream->output, &out_len); | |
97 | if (res != LZO_E_OK) | |
98 | goto failed; | |
99 | ||
100 | res = bytes = (int)out_len; | |
101 | for (i = 0, buff = stream->output; bytes && i < pages; i++) { | |
102 | avail = min_t(int, bytes, PAGE_CACHE_SIZE); | |
103 | memcpy(buffer[i], buff, avail); | |
104 | buff += avail; | |
105 | bytes -= avail; | |
106 | } | |
107 | ||
79cb8ced CJ |
108 | return res; |
109 | ||
79cb8ced | 110 | failed: |
79cb8ced CJ |
111 | return -EIO; |
112 | } | |
113 | ||
114 | const struct squashfs_decompressor squashfs_lzo_comp_ops = { | |
115 | .init = lzo_init, | |
116 | .free = lzo_free, | |
117 | .decompress = lzo_uncompress, | |
118 | .id = LZO_COMPRESSION, | |
119 | .name = "lzo", | |
120 | .supported = 1 | |
121 | }; |