[go: nahoru, domu]
1/*
2 * Copyright (C) 2014 Sergey Senozhatsky.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/slab.h>
12#include <linux/lz4.h>
13
14#include "zcomp_lz4.h"
15
16static void *zcomp_lz4_create(void)
17{
18	return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
19}
20
21static void zcomp_lz4_destroy(void *private)
22{
23	kfree(private);
24}
25
26static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst,
27		size_t *dst_len, void *private)
28{
29	/* return  : Success if return 0 */
30	return lz4_compress(src, PAGE_SIZE, dst, dst_len, private);
31}
32
33static int zcomp_lz4_decompress(const unsigned char *src, size_t src_len,
34		unsigned char *dst)
35{
36	size_t dst_len = PAGE_SIZE;
37	/* return  : Success if return 0 */
38	return lz4_decompress_unknownoutputsize(src, src_len, dst, &dst_len);
39}
40
41struct zcomp_backend zcomp_lz4 = {
42	.compress = zcomp_lz4_compress,
43	.decompress = zcomp_lz4_decompress,
44	.create = zcomp_lz4_create,
45	.destroy = zcomp_lz4_destroy,
46	.name = "lz4",
47};
48