Commit | Line | Data |
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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" | |
846b730e | 34 | #include "page_actor.h" |
79cb8ced CJ |
35 | |
36 | struct squashfs_lzo { | |
37 | void *input; | |
38 | void *output; | |
39 | }; | |
40 | ||
9508c6b9 | 41 | static void *lzo_init(struct squashfs_sb_info *msblk, void *buff) |
79cb8ced | 42 | { |
f3065f60 PL |
43 | int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); |
44 | ||
79cb8ced CJ |
45 | struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL); |
46 | if (stream == NULL) | |
47 | goto failed; | |
f3065f60 | 48 | stream->input = vmalloc(block_size); |
79cb8ced CJ |
49 | if (stream->input == NULL) |
50 | goto failed; | |
f3065f60 | 51 | stream->output = vmalloc(block_size); |
79cb8ced CJ |
52 | if (stream->output == NULL) |
53 | goto failed2; | |
54 | ||
55 | return stream; | |
56 | ||
57 | failed2: | |
58 | vfree(stream->input); | |
59 | failed: | |
60 | ERROR("Failed to allocate lzo workspace\n"); | |
61 | kfree(stream); | |
b7fc0ff0 | 62 | return ERR_PTR(-ENOMEM); |
79cb8ced CJ |
63 | } |
64 | ||
65 | ||
66 | static void lzo_free(void *strm) | |
67 | { | |
68 | struct squashfs_lzo *stream = strm; | |
69 | ||
70 | if (stream) { | |
71 | vfree(stream->input); | |
72 | vfree(stream->output); | |
73 | } | |
74 | kfree(stream); | |
75 | } | |
76 | ||
77 | ||
9508c6b9 | 78 | static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm, |
846b730e PL |
79 | struct buffer_head **bh, int b, int offset, int length, |
80 | struct squashfs_page_actor *output) | |
79cb8ced | 81 | { |
9508c6b9 | 82 | struct squashfs_lzo *stream = strm; |
846b730e | 83 | void *buff = stream->input, *data; |
79cb8ced | 84 | int avail, i, bytes = length, res; |
846b730e | 85 | size_t out_len = output->length; |
79cb8ced | 86 | |
79cb8ced | 87 | for (i = 0; i < b; i++) { |
79cb8ced CJ |
88 | avail = min(bytes, msblk->devblksize - offset); |
89 | memcpy(buff, bh[i]->b_data + offset, avail); | |
90 | buff += avail; | |
91 | bytes -= avail; | |
92 | offset = 0; | |
93 | put_bh(bh[i]); | |
94 | } | |
95 | ||
96 | res = lzo1x_decompress_safe(stream->input, (size_t)length, | |
97 | stream->output, &out_len); | |
98 | if (res != LZO_E_OK) | |
99 | goto failed; | |
100 | ||
101 | res = bytes = (int)out_len; | |
846b730e PL |
102 | data = squashfs_first_page(output); |
103 | buff = stream->output; | |
104 | while (data) { | |
09cbfeaf | 105 | if (bytes <= PAGE_SIZE) { |
846b730e PL |
106 | memcpy(data, buff, bytes); |
107 | break; | |
108 | } else { | |
09cbfeaf KS |
109 | memcpy(data, buff, PAGE_SIZE); |
110 | buff += PAGE_SIZE; | |
111 | bytes -= PAGE_SIZE; | |
846b730e PL |
112 | data = squashfs_next_page(output); |
113 | } | |
79cb8ced | 114 | } |
846b730e | 115 | squashfs_finish_page(output); |
79cb8ced | 116 | |
79cb8ced CJ |
117 | return res; |
118 | ||
79cb8ced | 119 | failed: |
79cb8ced CJ |
120 | return -EIO; |
121 | } | |
122 | ||
123 | const struct squashfs_decompressor squashfs_lzo_comp_ops = { | |
124 | .init = lzo_init, | |
125 | .free = lzo_free, | |
126 | .decompress = lzo_uncompress, | |
127 | .id = LZO_COMPRESSION, | |
128 | .name = "lzo", | |
129 | .supported = 1 | |
130 | }; |