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));
}