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