public void Lzma2EncProps_Init() { mLzmaProps = CLzmaEncProps.LzmaEncProps_Init(); mNumTotalThreads = -1; mNumBlockThreads = -1; mBlockSize = 0; }
/* * 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) */ public static SRes LzmaCompress( P <byte> dest, ref long destLen, P <byte> src, long srcLen, P <byte> outProps, ref long outPropsSize, /* *outPropsSize must be = 5 */ int level, /* 0 <= level <= 9, default = 5 */ uint 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 */ { var props = CLzmaEncProps.LzmaEncProps_Init(); props.mLevel = level; props.mDictSize = dictSize; props.mLC = lc; props.mLP = lp; props.mPB = pb; props.mFB = fb; props.mNumThreads = numThreads; return(LzmaEncode(dest, ref destLen, src, srcLen, props, outProps, ref outPropsSize, false, null, ISzAlloc.SmallAlloc, ISzAlloc.BigAlloc)); }