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1 | #ifndef __LZ4_H__ |
2 | #define __LZ4_H__ | |
3 | /* | |
4 | * LZ4 Kernel Interface | |
5 | * | |
6 | * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | /* | |
14 | * lz4_compressbound() | |
15 | * Provides the maximum size that LZ4 may output in a "worst case" scenario | |
16 | * (input data not compressible) | |
17 | */ | |
18 | static inline size_t lz4_compressbound(size_t isize) | |
19 | { | |
20 | return isize + (isize / 255) + 16; | |
21 | } | |
22 | ||
23 | /* | |
24 | * lz4_decompress() | |
25 | * src : source address of the compressed data | |
26 | * src_len : is the input size, whcih is returned after decompress done | |
27 | * dest : output buffer address of the decompressed data | |
28 | * actual_dest_len: is the size of uncompressed data, supposing it's known | |
29 | * return : Success if return 0 | |
30 | * Error if return (< 0) | |
31 | * note : Destination buffer must be already allocated. | |
32 | * slightly faster than lz4_decompress_unknownoutputsize() | |
33 | */ | |
34 | int lz4_decompress(const char *src, size_t *src_len, char *dest, | |
35 | size_t actual_dest_len); | |
36 | ||
37 | /* | |
38 | * lz4_decompress_unknownoutputsize() | |
39 | * src : source address of the compressed data | |
40 | * src_len : is the input size, therefore the compressed size | |
41 | * dest : output buffer address of the decompressed data | |
42 | * dest_len: is the max size of the destination buffer, which is | |
43 | * returned with actual size of decompressed data after | |
44 | * decompress done | |
45 | * return : Success if return 0 | |
46 | * Error if return (< 0) | |
47 | * note : Destination buffer must be already allocated. | |
48 | */ | |
49 | int lz4_decompress_unknownoutputsize(const char *src, size_t src_len, | |
50 | char *dest, size_t *dest_len); | |
51 | #endif |