86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2013
|
||
|
|
* Phillip Lougher <phillip@squashfs.org.uk>
|
||
|
|
*
|
||
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
||
|
|
* the COPYING file in the top-level directory.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/buffer_head.h>
|
||
|
|
|
||
|
|
#include "squashfs_fs.h"
|
||
|
|
#include "squashfs_fs_sb.h"
|
||
|
|
#include "decompressor.h"
|
||
|
|
#include "squashfs.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This file implements single-threaded decompression in the
|
||
|
|
* decompressor framework
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct squashfs_stream {
|
||
|
|
void *stream;
|
||
|
|
struct mutex mutex;
|
||
|
|
};
|
||
|
|
|
||
|
|
void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
|
||
|
|
void *comp_opts)
|
||
|
|
{
|
||
|
|
struct squashfs_stream *stream;
|
||
|
|
int err = -ENOMEM;
|
||
|
|
|
||
|
|
stream = kmalloc(sizeof(*stream), GFP_KERNEL);
|
||
|
|
if (stream == NULL)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
stream->stream = msblk->decompressor->init(msblk, comp_opts);
|
||
|
|
if (IS_ERR(stream->stream)) {
|
||
|
|
err = PTR_ERR(stream->stream);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
kfree(comp_opts);
|
||
|
|
mutex_init(&stream->mutex);
|
||
|
|
return stream;
|
||
|
|
|
||
|
|
out:
|
||
|
|
kfree(stream);
|
||
|
|
return ERR_PTR(err);
|
||
|
|
}
|
||
|
|
|
||
|
|
void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
|
||
|
|
{
|
||
|
|
struct squashfs_stream *stream = msblk->stream;
|
||
|
|
|
||
|
|
if (stream) {
|
||
|
|
msblk->decompressor->free(stream->stream);
|
||
|
|
kfree(stream);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh,
|
||
|
|
int b, int offset, int length, struct squashfs_page_actor *output)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
struct squashfs_stream *stream = msblk->stream;
|
||
|
|
|
||
|
|
mutex_lock(&stream->mutex);
|
||
|
|
res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
|
||
|
|
offset, length, output);
|
||
|
|
mutex_unlock(&stream->mutex);
|
||
|
|
|
||
|
|
if (res < 0)
|
||
|
|
ERROR("%s decompression failed, data probably corrupt\n",
|
||
|
|
msblk->decompressor->name);
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
int squashfs_max_decompressors(void)
|
||
|
|
{
|
||
|
|
return 1;
|
||
|
|
}
|