132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
|
/* LzmaLib.h -- LZMA library interface
|
||
|
|
2013-01-18 : Igor Pavlov : Public domain */
|
||
|
|
|
||
|
|
#ifndef __LZMA_LIB_H
|
||
|
|
#define __LZMA_LIB_H
|
||
|
|
|
||
|
|
#include "7zTypes.h"
|
||
|
|
|
||
|
|
EXTERN_C_BEGIN
|
||
|
|
|
||
|
|
#define MY_STDAPI int MY_STD_CALL
|
||
|
|
|
||
|
|
#define LZMA_PROPS_SIZE 5
|
||
|
|
|
||
|
|
/*
|
||
|
|
RAM requirements for LZMA:
|
||
|
|
for compression: (dictSize * 11.5 + 6 MB) + state_size
|
||
|
|
for decompression: dictSize + state_size
|
||
|
|
state_size = (4 + (1.5 << (lc + lp))) KB
|
||
|
|
by default (lc=3, lp=0), state_size = 16 KB.
|
||
|
|
|
||
|
|
LZMA properties (5 bytes) format
|
||
|
|
Offset Size Description
|
||
|
|
0 1 lc, lp and pb in encoded form.
|
||
|
|
1 4 dictSize (little endian).
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
LzmaCompress
|
||
|
|
------------
|
||
|
|
|
||
|
|
outPropsSize -
|
||
|
|
In: the pointer to the size of outProps buffer; *outPropsSize = LZMA_PROPS_SIZE = 5.
|
||
|
|
Out: the pointer to the size of written properties in outProps buffer; *outPropsSize = LZMA_PROPS_SIZE = 5.
|
||
|
|
|
||
|
|
LZMA Encoder will use defult values for any parameter, if it is
|
||
|
|
-1 for any from: level, loc, lp, pb, fb, numThreads
|
||
|
|
0 for dictSize
|
||
|
|
|
||
|
|
level - compression level: 0 <= level <= 9;
|
||
|
|
|
||
|
|
level dictSize algo fb
|
||
|
|
0: 16 KB 0 32
|
||
|
|
1: 64 KB 0 32
|
||
|
|
2: 256 KB 0 32
|
||
|
|
3: 1 MB 0 32
|
||
|
|
4: 4 MB 0 32
|
||
|
|
5: 16 MB 1 32
|
||
|
|
6: 32 MB 1 32
|
||
|
|
7+: 64 MB 1 64
|
||
|
|
|
||
|
|
The default value for "level" is 5.
|
||
|
|
|
||
|
|
algo = 0 means fast method
|
||
|
|
algo = 1 means normal method
|
||
|
|
|
||
|
|
dictSize - The dictionary size in bytes. The maximum value is
|
||
|
|
128 MB = (1 << 27) bytes for 32-bit version
|
||
|
|
1 GB = (1 << 30) bytes for 64-bit version
|
||
|
|
The default value is 16 MB = (1 << 24) bytes.
|
||
|
|
It's recommended to use the dictionary that is larger than 4 KB and
|
||
|
|
that can be calculated as (1 << N) or (3 << N) sizes.
|
||
|
|
|
||
|
|
lc - The number of literal context bits (high bits of previous literal).
|
||
|
|
It can be in the range from 0 to 8. The default value is 3.
|
||
|
|
Sometimes lc=4 gives the gain for big files.
|
||
|
|
|
||
|
|
lp - The number of literal pos bits (low bits of current position for literals).
|
||
|
|
It can be in the range from 0 to 4. The default value is 0.
|
||
|
|
The lp switch is intended for periodical data when the period is equal to 2^lp.
|
||
|
|
For example, for 32-bit (4 bytes) periodical data you can use lp=2. Often it's
|
||
|
|
better to set lc=0, if you change lp switch.
|
||
|
|
|
||
|
|
pb - The number of pos bits (low bits of current position).
|
||
|
|
It can be in the range from 0 to 4. The default value is 2.
|
||
|
|
The pb switch is intended for periodical data when the period is equal 2^pb.
|
||
|
|
|
||
|
|
fb - Word size (the number of fast bytes).
|
||
|
|
It can be in the range from 5 to 273. The default value is 32.
|
||
|
|
Usually, a big number gives a little bit better compression ratio and
|
||
|
|
slower compression process.
|
||
|
|
|
||
|
|
numThreads - The number of thereads. 1 or 2. The default value is 2.
|
||
|
|
Fast mode (algo = 0) can use only 1 thread.
|
||
|
|
|
||
|
|
Out:
|
||
|
|
destLen - processed output size
|
||
|
|
Returns:
|
||
|
|
SZ_OK - OK
|
||
|
|
SZ_ERROR_MEM - Memory allocation error
|
||
|
|
SZ_ERROR_PARAM - Incorrect paramater
|
||
|
|
SZ_ERROR_OUTPUT_EOF - output buffer overflow
|
||
|
|
SZ_ERROR_THREAD - errors in multithreading functions (only for Mt version)
|
||
|
|
*/
|
||
|
|
|
||
|
|
MY_STDAPI LzmaCompress(unsigned char *dest, size_t *destLen, const unsigned char *src, size_t srcLen,
|
||
|
|
unsigned char *outProps, size_t *outPropsSize, /* *outPropsSize must be = 5 */
|
||
|
|
int level, /* 0 <= level <= 9, default = 5 */
|
||
|
|
unsigned dictSize, /* default = (1 << 24) */
|
||
|
|
int lc, /* 0 <= lc <= 8, default = 3 */
|
||
|
|
int lp, /* 0 <= lp <= 4, default = 0 */
|
||
|
|
int pb, /* 0 <= pb <= 4, default = 2 */
|
||
|
|
int fb, /* 5 <= fb <= 273, default = 32 */
|
||
|
|
int numThreads /* 1 or 2, default = 2 */
|
||
|
|
);
|
||
|
|
|
||
|
|
/*
|
||
|
|
LzmaUncompress
|
||
|
|
--------------
|
||
|
|
In:
|
||
|
|
dest - output data
|
||
|
|
destLen - output data size
|
||
|
|
src - input data
|
||
|
|
srcLen - input data size
|
||
|
|
Out:
|
||
|
|
destLen - processed output size
|
||
|
|
srcLen - processed input size
|
||
|
|
Returns:
|
||
|
|
SZ_OK - OK
|
||
|
|
SZ_ERROR_DATA - Data error
|
||
|
|
SZ_ERROR_MEM - Memory allocation arror
|
||
|
|
SZ_ERROR_UNSUPPORTED - Unsupported properties
|
||
|
|
SZ_ERROR_INPUT_EOF - it needs more bytes in input buffer (src)
|
||
|
|
*/
|
||
|
|
|
||
|
|
MY_STDAPI LzmaUncompress(unsigned char *dest, size_t *destLen, const unsigned char *src, SizeT *srcLen,
|
||
|
|
const unsigned char *props, size_t propsSize);
|
||
|
|
|
||
|
|
EXTERN_C_END
|
||
|
|
|
||
|
|
#endif
|