source: src/linux/universal/linux-4.9/fs/squashfs/decompressor_single.c @ 31630

Last change on this file since 31630 was 31630, checked in by brainslayer, 2 weeks ago

new fs is compatible with standard squashfs, just smaller

File size: 1.8 KB
Line 
1/*
2 * Copyright (c) 2013
3 * Phillip Lougher <phillip@squashfs.org.uk>
4 *
5 * This work is licensed under the terms of the GNU GPL, version 2. See
6 * the COPYING file in the top-level directory.
7 */
8
9#include <linux/types.h>
10#include <linux/mutex.h>
11#include <linux/slab.h>
12#include <linux/buffer_head.h>
13
14#include "squashfs_fs.h"
15#include "squashfs_fs_sb.h"
16#include "decompressor.h"
17#include "squashfs.h"
18
19/*
20 * This file implements single-threaded decompression in the
21 * decompressor framework
22 */
23
24struct squashfs_stream {
25        void            *stream;
26        struct mutex    mutex;
27};
28
29void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
30                                                void *comp_opts)
31{
32        struct squashfs_stream *stream;
33        int err = -ENOMEM;
34
35        stream = kmalloc(sizeof(*stream), GFP_KERNEL);
36        if (stream == NULL)
37                goto out;
38
39        stream->stream = msblk->decompressor->init(msblk, comp_opts);
40        if (IS_ERR(stream->stream)) {
41                err = PTR_ERR(stream->stream);
42                goto out;
43        }
44
45        kfree(comp_opts);
46        mutex_init(&stream->mutex);
47        return stream;
48
49out:
50        kfree(stream);
51        return ERR_PTR(err);
52}
53
54void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
55{
56        struct squashfs_stream *stream = msblk->stream;
57
58        if (stream) {
59                msblk->decompressor->free(stream->stream);
60                kfree(stream);
61        }
62}
63
64int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh,
65        int b, int offset, int length, struct squashfs_page_actor *output)
66{
67        int res;
68        struct squashfs_stream *stream = msblk->stream;
69
70        mutex_lock(&stream->mutex);
71        res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
72                offset, length, output);
73        mutex_unlock(&stream->mutex);
74
75        if (res < 0)
76                ERROR("%s decompression failed, data probably corrupt\n",
77                        msblk->decompressor->name);
78
79        return res;
80}
81
82int squashfs_max_decompressors(void)
83{
84        return 1;
85}
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