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6e76668e SS |
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 | ||
16 | static void *zcomp_lz4_create(void) | |
17 | { | |
18 | return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL); | |
19 | } | |
20 | ||
21 | static void zcomp_lz4_destroy(void *private) | |
22 | { | |
23 | kfree(private); | |
24 | } | |
25 | ||
26 | static 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 | ||
33 | static 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 | ||
41 | struct 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 | }; |