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cffb78b0 KL |
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 | */ | |
06af1c52 BK |
12 | #define LZ4_MEM_COMPRESS (16384) |
13 | #define LZ4HC_MEM_COMPRESS (262144 + (2 * sizeof(unsigned char *))) | |
cffb78b0 KL |
14 | |
15 | /* | |
16 | * lz4_compressbound() | |
17 | * Provides the maximum size that LZ4 may output in a "worst case" scenario | |
18 | * (input data not compressible) | |
19 | */ | |
20 | static inline size_t lz4_compressbound(size_t isize) | |
21 | { | |
22 | return isize + (isize / 255) + 16; | |
23 | } | |
24 | ||
c72ac7a1 CM |
25 | /* |
26 | * lz4_compress() | |
27 | * src : source address of the original data | |
28 | * src_len : size of the original data | |
29 | * dst : output buffer address of the compressed data | |
30 | * This requires 'dst' of size LZ4_COMPRESSBOUND. | |
31 | * dst_len : is the output size, which is returned after compress done | |
32 | * workmem : address of the working memory. | |
33 | * This requires 'workmem' of size LZ4_MEM_COMPRESS. | |
34 | * return : Success if return 0 | |
35 | * Error if return (< 0) | |
36 | * note : Destination buffer and workmem must be already allocated with | |
37 | * the defined size. | |
38 | */ | |
39 | int lz4_compress(const unsigned char *src, size_t src_len, | |
40 | unsigned char *dst, size_t *dst_len, void *wrkmem); | |
41 | ||
42 | /* | |
43 | * lz4hc_compress() | |
44 | * src : source address of the original data | |
45 | * src_len : size of the original data | |
46 | * dst : output buffer address of the compressed data | |
47 | * This requires 'dst' of size LZ4_COMPRESSBOUND. | |
48 | * dst_len : is the output size, which is returned after compress done | |
49 | * workmem : address of the working memory. | |
50 | * This requires 'workmem' of size LZ4HC_MEM_COMPRESS. | |
51 | * return : Success if return 0 | |
52 | * Error if return (< 0) | |
53 | * note : Destination buffer and workmem must be already allocated with | |
54 | * the defined size. | |
55 | */ | |
56 | int lz4hc_compress(const unsigned char *src, size_t src_len, | |
57 | unsigned char *dst, size_t *dst_len, void *wrkmem); | |
58 | ||
cffb78b0 KL |
59 | /* |
60 | * lz4_decompress() | |
61 | * src : source address of the compressed data | |
62 | * src_len : is the input size, whcih is returned after decompress done | |
63 | * dest : output buffer address of the decompressed data | |
64 | * actual_dest_len: is the size of uncompressed data, supposing it's known | |
65 | * return : Success if return 0 | |
66 | * Error if return (< 0) | |
67 | * note : Destination buffer must be already allocated. | |
68 | * slightly faster than lz4_decompress_unknownoutputsize() | |
69 | */ | |
b34081f1 SS |
70 | int lz4_decompress(const unsigned char *src, size_t *src_len, |
71 | unsigned char *dest, size_t actual_dest_len); | |
cffb78b0 KL |
72 | |
73 | /* | |
74 | * lz4_decompress_unknownoutputsize() | |
75 | * src : source address of the compressed data | |
76 | * src_len : is the input size, therefore the compressed size | |
77 | * dest : output buffer address of the decompressed data | |
78 | * dest_len: is the max size of the destination buffer, which is | |
79 | * returned with actual size of decompressed data after | |
80 | * decompress done | |
81 | * return : Success if return 0 | |
82 | * Error if return (< 0) | |
83 | * note : Destination buffer must be already allocated. | |
84 | */ | |
b34081f1 SS |
85 | int lz4_decompress_unknownoutputsize(const unsigned char *src, size_t src_len, |
86 | unsigned char *dest, size_t *dest_len); | |
cffb78b0 | 87 | #endif |