Blame view
fs/squashfs/xz_wrapper.c
4.26 KB
81bb8debd Squashfs: add XZ ... |
1 2 3 4 |
/* * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
d7f2ff671 Squashfs: update ... |
5 |
* Phillip Lougher <phillip@squashfs.org.uk> |
81bb8debd Squashfs: add XZ ... |
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
* * 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. * * xz_wrapper.c */ #include <linux/mutex.h> #include <linux/buffer_head.h> #include <linux/slab.h> #include <linux/xz.h> |
ff750311d Squashfs: add com... |
29 |
#include <linux/bitops.h> |
81bb8debd Squashfs: add XZ ... |
30 31 32 |
#include "squashfs_fs.h" #include "squashfs_fs_sb.h" |
81bb8debd Squashfs: add XZ ... |
33 34 |
#include "squashfs.h" #include "decompressor.h" |
846b730e9 Squashfs: General... |
35 |
#include "page_actor.h" |
81bb8debd Squashfs: add XZ ... |
36 37 38 39 40 |
struct squashfs_xz { struct xz_dec *state; struct xz_buf buf; }; |
9508c6b90 Squashfs: Refacto... |
41 |
struct disk_comp_opts { |
ff750311d Squashfs: add com... |
42 43 44 |
__le32 dictionary_size; __le32 flags; }; |
9508c6b90 Squashfs: Refacto... |
45 46 47 48 49 50 |
struct comp_opts { int dict_size; }; static void *squashfs_xz_comp_opts(struct squashfs_sb_info *msblk, void *buff, int len) |
81bb8debd Squashfs: add XZ ... |
51 |
{ |
9508c6b90 Squashfs: Refacto... |
52 53 54 55 56 57 58 59 60 |
struct disk_comp_opts *comp_opts = buff; struct comp_opts *opts; int err = 0, n; opts = kmalloc(sizeof(*opts), GFP_KERNEL); if (opts == NULL) { err = -ENOMEM; goto out2; } |
ff750311d Squashfs: add com... |
61 62 63 64 65 |
if (comp_opts) { /* check compressor options are the expected length */ if (len < sizeof(*comp_opts)) { err = -EIO; |
9508c6b90 Squashfs: Refacto... |
66 |
goto out; |
ff750311d Squashfs: add com... |
67 |
} |
9508c6b90 Squashfs: Refacto... |
68 |
opts->dict_size = le32_to_cpu(comp_opts->dictionary_size); |
ff750311d Squashfs: add com... |
69 70 |
/* the dictionary size should be 2^n or 2^n+2^(n+1) */ |
9508c6b90 Squashfs: Refacto... |
71 72 |
n = ffs(opts->dict_size) - 1; if (opts->dict_size != (1 << n) && opts->dict_size != (1 << n) + |
ff750311d Squashfs: add com... |
73 74 |
(1 << (n + 1))) { err = -EIO; |
9508c6b90 Squashfs: Refacto... |
75 |
goto out; |
ff750311d Squashfs: add com... |
76 |
} |
9508c6b90 Squashfs: Refacto... |
77 78 79 80 |
} else /* use defaults */ opts->dict_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); |
ff750311d Squashfs: add com... |
81 |
|
9508c6b90 Squashfs: Refacto... |
82 83 84 85 86 87 88 89 90 91 92 93 94 95 |
return opts; out: kfree(opts); out2: return ERR_PTR(err); } static void *squashfs_xz_init(struct squashfs_sb_info *msblk, void *buff) { struct comp_opts *comp_opts = buff; struct squashfs_xz *stream; int err; |
81bb8debd Squashfs: add XZ ... |
96 |
|
ff750311d Squashfs: add com... |
97 98 99 |
stream = kmalloc(sizeof(*stream), GFP_KERNEL); if (stream == NULL) { err = -ENOMEM; |
81bb8debd Squashfs: add XZ ... |
100 |
goto failed; |
ff750311d Squashfs: add com... |
101 |
} |
81bb8debd Squashfs: add XZ ... |
102 |
|
9508c6b90 Squashfs: Refacto... |
103 |
stream->state = xz_dec_init(XZ_PREALLOC, comp_opts->dict_size); |
ff750311d Squashfs: add com... |
104 105 106 |
if (stream->state == NULL) { kfree(stream); err = -ENOMEM; |
81bb8debd Squashfs: add XZ ... |
107 |
goto failed; |
ff750311d Squashfs: add com... |
108 |
} |
81bb8debd Squashfs: add XZ ... |
109 110 111 112 |
return stream; failed: |
ff750311d Squashfs: add com... |
113 114 115 |
ERROR("Failed to initialise xz decompressor "); return ERR_PTR(err); |
81bb8debd Squashfs: add XZ ... |
116 117 118 119 120 121 122 123 124 125 126 127 |
} static void squashfs_xz_free(void *strm) { struct squashfs_xz *stream = strm; if (stream) { xz_dec_end(stream->state); kfree(stream); } } |
9508c6b90 Squashfs: Refacto... |
128 |
static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm, |
846b730e9 Squashfs: General... |
129 130 |
struct buffer_head **bh, int b, int offset, int length, struct squashfs_page_actor *output) |
81bb8debd Squashfs: add XZ ... |
131 132 |
{ enum xz_ret xz_err; |
846b730e9 Squashfs: General... |
133 |
int avail, total = 0, k = 0; |
9508c6b90 Squashfs: Refacto... |
134 |
struct squashfs_xz *stream = strm; |
81bb8debd Squashfs: add XZ ... |
135 136 137 138 139 |
xz_dec_reset(stream->state); stream->buf.in_pos = 0; stream->buf.in_size = 0; stream->buf.out_pos = 0; |
09cbfeaf1 mm, fs: get rid o... |
140 |
stream->buf.out_size = PAGE_SIZE; |
846b730e9 Squashfs: General... |
141 |
stream->buf.out = squashfs_first_page(output); |
81bb8debd Squashfs: add XZ ... |
142 143 144 145 146 |
do { if (stream->buf.in_pos == stream->buf.in_size && k < b) { avail = min(length, msblk->devblksize - offset); length -= avail; |
81bb8debd Squashfs: add XZ ... |
147 148 149 150 151 |
stream->buf.in = bh[k]->b_data + offset; stream->buf.in_size = avail; stream->buf.in_pos = 0; offset = 0; } |
846b730e9 Squashfs: General... |
152 153 154 155 |
if (stream->buf.out_pos == stream->buf.out_size) { stream->buf.out = squashfs_next_page(output); if (stream->buf.out != NULL) { stream->buf.out_pos = 0; |
09cbfeaf1 mm, fs: get rid o... |
156 |
total += PAGE_SIZE; |
846b730e9 Squashfs: General... |
157 |
} |
81bb8debd Squashfs: add XZ ... |
158 159 160 161 162 163 164 |
} xz_err = xz_dec_run(stream->state, &stream->buf); if (stream->buf.in_pos == stream->buf.in_size && k < b) put_bh(bh[k++]); } while (xz_err == XZ_OK); |
846b730e9 Squashfs: General... |
165 |
squashfs_finish_page(output); |
9508c6b90 Squashfs: Refacto... |
166 167 |
if (xz_err != XZ_STREAM_END || k < b) goto out; |
81bb8debd Squashfs: add XZ ... |
168 |
|
9508c6b90 Squashfs: Refacto... |
169 |
return total + stream->buf.out_pos; |
81bb8debd Squashfs: add XZ ... |
170 |
|
9508c6b90 Squashfs: Refacto... |
171 |
out: |
81bb8debd Squashfs: add XZ ... |
172 173 174 175 176 177 178 179 |
for (; k < b; k++) put_bh(bh[k]); return -EIO; } const struct squashfs_decompressor squashfs_xz_comp_ops = { .init = squashfs_xz_init, |
9508c6b90 Squashfs: Refacto... |
180 |
.comp_opts = squashfs_xz_comp_opts, |
81bb8debd Squashfs: add XZ ... |
181 182 183 184 185 186 |
.free = squashfs_xz_free, .decompress = squashfs_xz_uncompress, .id = XZ_COMPRESSION, .name = "xz", .supported = 1 }; |