blob: 934c17e965908eccff7e23729f8b9f27a0425628 [file] [log] [blame]
Chan Jeong79cb8ce2010-08-05 02:29:59 +01001/*
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"
Chan Jeong79cb8ce2010-08-05 02:29:59 +010032#include "squashfs.h"
33#include "decompressor.h"
Phillip Lougher846b7302013-11-18 02:59:12 +000034#include "page_actor.h"
Chan Jeong79cb8ce2010-08-05 02:29:59 +010035
36struct squashfs_lzo {
37 void *input;
38 void *output;
39};
40
Phillip Lougher9508c6b2013-11-13 02:56:26 +000041static void *lzo_init(struct squashfs_sb_info *msblk, void *buff)
Chan Jeong79cb8ce2010-08-05 02:29:59 +010042{
Phillip Lougherf3065f62010-08-05 04:51:50 +010043 int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
44
Chan Jeong79cb8ce2010-08-05 02:29:59 +010045 struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
46 if (stream == NULL)
47 goto failed;
Phillip Lougherf3065f62010-08-05 04:51:50 +010048 stream->input = vmalloc(block_size);
Chan Jeong79cb8ce2010-08-05 02:29:59 +010049 if (stream->input == NULL)
50 goto failed;
Phillip Lougherf3065f62010-08-05 04:51:50 +010051 stream->output = vmalloc(block_size);
Chan Jeong79cb8ce2010-08-05 02:29:59 +010052 if (stream->output == NULL)
53 goto failed2;
54
55 return stream;
56
57failed2:
58 vfree(stream->input);
59failed:
60 ERROR("Failed to allocate lzo workspace\n");
61 kfree(stream);
Phillip Lougherb7fc0ff2011-02-28 01:45:42 +000062 return ERR_PTR(-ENOMEM);
Chan Jeong79cb8ce2010-08-05 02:29:59 +010063}
64
65
66static 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
Phillip Lougher9508c6b2013-11-13 02:56:26 +000078static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm,
Phillip Lougher846b7302013-11-18 02:59:12 +000079 struct buffer_head **bh, int b, int offset, int length,
80 struct squashfs_page_actor *output)
Chan Jeong79cb8ce2010-08-05 02:29:59 +010081{
Phillip Lougher9508c6b2013-11-13 02:56:26 +000082 struct squashfs_lzo *stream = strm;
Phillip Lougher846b7302013-11-18 02:59:12 +000083 void *buff = stream->input, *data;
Chan Jeong79cb8ce2010-08-05 02:29:59 +010084 int avail, i, bytes = length, res;
Phillip Lougher846b7302013-11-18 02:59:12 +000085 size_t out_len = output->length;
Chan Jeong79cb8ce2010-08-05 02:29:59 +010086
Chan Jeong79cb8ce2010-08-05 02:29:59 +010087 for (i = 0; i < b; i++) {
Chan Jeong79cb8ce2010-08-05 02:29:59 +010088 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;
Phillip Lougher846b7302013-11-18 02:59:12 +0000102 data = squashfs_first_page(output);
103 buff = stream->output;
104 while (data) {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300105 if (bytes <= PAGE_SIZE) {
Phillip Lougher846b7302013-11-18 02:59:12 +0000106 memcpy(data, buff, bytes);
107 break;
108 } else {
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300109 memcpy(data, buff, PAGE_SIZE);
110 buff += PAGE_SIZE;
111 bytes -= PAGE_SIZE;
Phillip Lougher846b7302013-11-18 02:59:12 +0000112 data = squashfs_next_page(output);
113 }
Chan Jeong79cb8ce2010-08-05 02:29:59 +0100114 }
Phillip Lougher846b7302013-11-18 02:59:12 +0000115 squashfs_finish_page(output);
Chan Jeong79cb8ce2010-08-05 02:29:59 +0100116
Chan Jeong79cb8ce2010-08-05 02:29:59 +0100117 return res;
118
Chan Jeong79cb8ce2010-08-05 02:29:59 +0100119failed:
Chan Jeong79cb8ce2010-08-05 02:29:59 +0100120 return -EIO;
121}
122
123const 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};