Blame view
fs/squashfs/zlib_wrapper.c
3.47 KB
e6a6d3795 Squashfs: move zl... |
1 2 3 4 |
/* * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
d7f2ff671 Squashfs: update ... |
5 |
* Phillip Lougher <phillip@squashfs.org.uk> |
e6a6d3795 Squashfs: move zl... |
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2, * or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * zlib_wrapper.c */ #include <linux/mutex.h> #include <linux/buffer_head.h> |
5a0e3ad6a include cleanup: ... |
27 |
#include <linux/slab.h> |
e6a6d3795 Squashfs: move zl... |
28 |
#include <linux/zlib.h> |
117a91e0f Squashfs: Use vma... |
29 |
#include <linux/vmalloc.h> |
e6a6d3795 Squashfs: move zl... |
30 31 32 |
#include "squashfs_fs.h" #include "squashfs_fs_sb.h" |
e6a6d3795 Squashfs: move zl... |
33 |
#include "squashfs.h" |
4c0f0bb23 Squashfs: add a d... |
34 |
#include "decompressor.h" |
e6a6d3795 Squashfs: move zl... |
35 |
|
b7fc0ff09 Squashfs: extend ... |
36 |
static void *zlib_init(struct squashfs_sb_info *dummy, void *buff, int len) |
f1a40359f Squashfs: factor ... |
37 38 39 40 |
{ z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL); if (stream == NULL) goto failed; |
117a91e0f Squashfs: Use vma... |
41 |
stream->workspace = vmalloc(zlib_inflate_workspacesize()); |
f1a40359f Squashfs: factor ... |
42 43 44 45 46 47 48 49 50 |
if (stream->workspace == NULL) goto failed; return stream; failed: ERROR("Failed to allocate zlib workspace "); kfree(stream); |
b7fc0ff09 Squashfs: extend ... |
51 |
return ERR_PTR(-ENOMEM); |
f1a40359f Squashfs: factor ... |
52 |
} |
4c0f0bb23 Squashfs: add a d... |
53 |
static void zlib_free(void *strm) |
f1a40359f Squashfs: factor ... |
54 55 56 57 |
{ z_stream *stream = strm; if (stream) |
117a91e0f Squashfs: Use vma... |
58 |
vfree(stream->workspace); |
f1a40359f Squashfs: factor ... |
59 60 |
kfree(stream); } |
4c0f0bb23 Squashfs: add a d... |
61 |
static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer, |
e6a6d3795 Squashfs: move zl... |
62 63 64 |
struct buffer_head **bh, int b, int offset, int length, int srclength, int pages) { |
170cf0216 Squashfs: remove ... |
65 66 |
int zlib_err, zlib_init = 0; int k = 0, page = 0; |
f1a40359f Squashfs: factor ... |
67 |
z_stream *stream = msblk->stream; |
e6a6d3795 Squashfs: move zl... |
68 69 |
mutex_lock(&msblk->read_data_mutex); |
f1a40359f Squashfs: factor ... |
70 71 |
stream->avail_out = 0; stream->avail_in = 0; |
e6a6d3795 Squashfs: move zl... |
72 |
|
e6a6d3795 Squashfs: move zl... |
73 |
do { |
f1a40359f Squashfs: factor ... |
74 |
if (stream->avail_in == 0 && k < b) { |
170cf0216 Squashfs: remove ... |
75 76 |
int avail = min(length, msblk->devblksize - offset); length -= avail; |
e6a6d3795 Squashfs: move zl... |
77 78 79 |
wait_on_buffer(bh[k]); if (!buffer_uptodate(bh[k])) goto release_mutex; |
f1a40359f Squashfs: factor ... |
80 81 |
stream->next_in = bh[k]->b_data + offset; stream->avail_in = avail; |
e6a6d3795 Squashfs: move zl... |
82 83 |
offset = 0; } |
f1a40359f Squashfs: factor ... |
84 85 86 |
if (stream->avail_out == 0 && page < pages) { stream->next_out = buffer[page++]; stream->avail_out = PAGE_CACHE_SIZE; |
e6a6d3795 Squashfs: move zl... |
87 88 89 |
} if (!zlib_init) { |
f1a40359f Squashfs: factor ... |
90 |
zlib_err = zlib_inflateInit(stream); |
e6a6d3795 Squashfs: move zl... |
91 92 93 94 95 96 97 98 99 |
if (zlib_err != Z_OK) { ERROR("zlib_inflateInit returned unexpected " "result 0x%x, srclength %d ", zlib_err, srclength); goto release_mutex; } zlib_init = 1; } |
f1a40359f Squashfs: factor ... |
100 |
zlib_err = zlib_inflate(stream, Z_SYNC_FLUSH); |
e6a6d3795 Squashfs: move zl... |
101 |
|
f1a40359f Squashfs: factor ... |
102 |
if (stream->avail_in == 0 && k < b) |
e6a6d3795 Squashfs: move zl... |
103 104 105 106 107 108 109 110 |
put_bh(bh[k++]); } while (zlib_err == Z_OK); if (zlib_err != Z_STREAM_END) { ERROR("zlib_inflate error, data probably corrupt "); goto release_mutex; } |
f1a40359f Squashfs: factor ... |
111 |
zlib_err = zlib_inflateEnd(stream); |
e6a6d3795 Squashfs: move zl... |
112 113 114 115 116 |
if (zlib_err != Z_OK) { ERROR("zlib_inflate error, data probably corrupt "); goto release_mutex; } |
e7ee11f0e Squashfs: add mis... |
117 118 119 120 121 |
if (k < b) { ERROR("zlib_uncompress error, data remaining "); goto release_mutex; } |
792590c72 squashfs: fix loc... |
122 |
length = stream->total_out; |
e6a6d3795 Squashfs: move zl... |
123 |
mutex_unlock(&msblk->read_data_mutex); |
792590c72 squashfs: fix loc... |
124 |
return length; |
e6a6d3795 Squashfs: move zl... |
125 126 127 128 129 130 131 132 133 |
release_mutex: mutex_unlock(&msblk->read_data_mutex); for (; k < b; k++) put_bh(bh[k]); return -EIO; } |
4c0f0bb23 Squashfs: add a d... |
134 135 136 137 138 139 140 141 142 |
const struct squashfs_decompressor squashfs_zlib_comp_ops = { .init = zlib_init, .free = zlib_free, .decompress = zlib_uncompress, .id = ZLIB_COMPRESSION, .name = "zlib", .supported = 1 }; |