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Issue 658573004: Updating to new OTS repo from https://github.com/khaledhosny/ots.git (Closed) Base URL: https://chromium.googlesource.com/external/ots@master
Patch Set: Adding Colored Emoji changes from external/git repo Created 6 years, 2 months ago
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1 /* LzmaLib.h -- LZMA library interface
2 2009-04-07 : Igor Pavlov : Public domain
3 in the public domain */
4
5 #ifndef __LZMA_LIB_H
6 #define __LZMA_LIB_H
7
8 #include "Types.h"
9
10 #ifdef __cplusplus
11 extern "C" {
12 #endif
13
14 #define MY_STDAPI int MY_STD_CALL
15
16 #define LZMA_PROPS_SIZE 5
17
18 /*
19 RAM requirements for LZMA:
20 for compression: (dictSize * 11.5 + 6 MB) + state_size
21 for decompression: dictSize + state_size
22 state_size = (4 + (1.5 << (lc + lp))) KB
23 by default (lc=3, lp=0), state_size = 16 KB.
24
25 LZMA properties (5 bytes) format
26 Offset Size Description
27 0 1 lc, lp and pb in encoded form.
28 1 4 dictSize (little endian).
29 */
30
31 /*
32 LzmaCompress
33 ------------
34
35 outPropsSize -
36 In: the pointer to the size of outProps buffer; *outPropsSize = LZMA_PROPS _SIZE = 5.
37 Out: the pointer to the size of written properties in outProps buffer; *out PropsSize = LZMA_PROPS_SIZE = 5.
38
39 LZMA Encoder will use defult values for any parameter, if it is
40 -1 for any from: level, loc, lp, pb, fb, numThreads
41 0 for dictSize
42
43 level - compression level: 0 <= level <= 9;
44
45 level dictSize algo fb
46 0: 16 KB 0 32
47 1: 64 KB 0 32
48 2: 256 KB 0 32
49 3: 1 MB 0 32
50 4: 4 MB 0 32
51 5: 16 MB 1 32
52 6: 32 MB 1 32
53 7+: 64 MB 1 64
54
55 The default value for "level" is 5.
56
57 algo = 0 means fast method
58 algo = 1 means normal method
59
60 dictSize - The dictionary size in bytes. The maximum value is
61 128 MB = (1 << 27) bytes for 32-bit version
62 1 GB = (1 << 30) bytes for 64-bit version
63 The default value is 16 MB = (1 << 24) bytes.
64 It's recommended to use the dictionary that is larger than 4 KB and
65 that can be calculated as (1 << N) or (3 << N) sizes.
66
67 lc - The number of literal context bits (high bits of previous literal).
68 It can be in the range from 0 to 8. The default value is 3.
69 Sometimes lc=4 gives the gain for big files.
70
71 lp - The number of literal pos bits (low bits of current position for literals).
72 It can be in the range from 0 to 4. The default value is 0.
73 The lp switch is intended for periodical data when the period is equal to 2 ^lp.
74 For example, for 32-bit (4 bytes) periodical data you can use lp=2. Often i t's
75 better to set lc=0, if you change lp switch.
76
77 pb - The number of pos bits (low bits of current position).
78 It can be in the range from 0 to 4. The default value is 2.
79 The pb switch is intended for periodical data when the period is equal 2^pb .
80
81 fb - Word size (the number of fast bytes).
82 It can be in the range from 5 to 273. The default value is 32.
83 Usually, a big number gives a little bit better compression ratio and
84 slower compression process.
85
86 numThreads - The number of thereads. 1 or 2. The default value is 2.
87 Fast mode (algo = 0) can use only 1 thread.
88
89 Out:
90 destLen - processed output size
91 Returns:
92 SZ_OK - OK
93 SZ_ERROR_MEM - Memory allocation error
94 SZ_ERROR_PARAM - Incorrect paramater
95 SZ_ERROR_OUTPUT_EOF - output buffer overflow
96 SZ_ERROR_THREAD - errors in multithreading functions (only for Mt version)
97 */
98
99 MY_STDAPI LzmaCompress(unsigned char *dest, size_t *destLen, const unsigned char *src, size_t srcLen,
100 unsigned char *outProps, size_t *outPropsSize, /* *outPropsSize must be = 5 */
101 int level, /* 0 <= level <= 9, default = 5 */
102 unsigned dictSize, /* default = (1 << 24) */
103 int lc, /* 0 <= lc <= 8, default = 3 */
104 int lp, /* 0 <= lp <= 4, default = 0 */
105 int pb, /* 0 <= pb <= 4, default = 2 */
106 int fb, /* 5 <= fb <= 273, default = 32 */
107 int numThreads /* 1 or 2, default = 2 */
108 );
109
110 /*
111 LzmaUncompress
112 --------------
113 In:
114 dest - output data
115 destLen - output data size
116 src - input data
117 srcLen - input data size
118 Out:
119 destLen - processed output size
120 srcLen - processed input size
121 Returns:
122 SZ_OK - OK
123 SZ_ERROR_DATA - Data error
124 SZ_ERROR_MEM - Memory allocation arror
125 SZ_ERROR_UNSUPPORTED - Unsupported properties
126 SZ_ERROR_INPUT_EOF - it needs more bytes in input buffer (src)
127 */
128
129 MY_STDAPI LzmaUncompress(unsigned char *dest, size_t *destLen, const unsigned ch ar *src, SizeT *srcLen,
130 const unsigned char *props, size_t propsSize);
131
132 #ifdef __cplusplus
133 }
134 #endif
135
136 #endif
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