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111 lines
3.1 KiB
111 lines
3.1 KiB
/* Lzma86.h -- LZMA + x86 (BCJ) Filter |
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2013-01-18 : Igor Pavlov : Public domain */ |
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#ifndef __LZMA86_H |
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#define __LZMA86_H |
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#include "7zTypes.h" |
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EXTERN_C_BEGIN |
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#define LZMA86_SIZE_OFFSET (1 + 5) |
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#define LZMA86_HEADER_SIZE (LZMA86_SIZE_OFFSET + 8) |
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/* |
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It's an example for LZMA + x86 Filter use. |
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You can use .lzma86 extension, if you write that stream to file. |
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.lzma86 header adds one additional byte to standard .lzma header. |
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.lzma86 header (14 bytes): |
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Offset Size Description |
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0 1 = 0 - no filter, pure LZMA |
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= 1 - x86 filter + LZMA |
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1 1 lc, lp and pb in encoded form |
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2 4 dictSize (little endian) |
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6 8 uncompressed size (little endian) |
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Lzma86_Encode |
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------------- |
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level - compression level: 0 <= level <= 9, the default value for "level" is 5. |
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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, for level = 5. |
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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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For better compression ratio dictSize must be >= inSize. |
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filterMode: |
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SZ_FILTER_NO - no Filter |
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SZ_FILTER_YES - x86 Filter |
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SZ_FILTER_AUTO - it tries both alternatives to select best. |
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Encoder will use 2 or 3 passes: |
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2 passes when FILTER_NO provides better compression. |
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3 passes when FILTER_YES provides better compression. |
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Lzma86Encode allocates Data with MyAlloc functions. |
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RAM Requirements for compressing: |
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RamSize = dictionarySize * 11.5 + 6MB + FilterBlockSize |
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filterMode FilterBlockSize |
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SZ_FILTER_NO 0 |
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SZ_FILTER_YES inSize |
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SZ_FILTER_AUTO inSize |
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Return code: |
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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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enum ESzFilterMode |
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{ |
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SZ_FILTER_NO, |
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SZ_FILTER_YES, |
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SZ_FILTER_AUTO |
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}; |
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SRes Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen, |
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int level, UInt32 dictSize, int filterMode); |
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/* |
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Lzma86_GetUnpackSize: |
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In: |
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src - input data |
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srcLen - input data size |
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Out: |
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unpackSize - size of uncompressed stream |
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Return code: |
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SZ_OK - OK |
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SZ_ERROR_INPUT_EOF - Error in headers |
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*/ |
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SRes Lzma86_GetUnpackSize(const Byte *src, SizeT srcLen, UInt64 *unpackSize); |
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/* |
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Lzma86_Decode: |
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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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Return code: |
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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 error |
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SZ_ERROR_UNSUPPORTED - unsupported file |
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SZ_ERROR_INPUT_EOF - it needs more bytes in input buffer |
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*/ |
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SRes Lzma86_Decode(Byte *dest, SizeT *destLen, const Byte *src, SizeT *srcLen); |
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EXTERN_C_END |
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#endif
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