void Create()
{
if (_matchFinder == null)
{
LZBinTree bt = new LZBinTree();
int numHashBytes = 4;
if (_matchFinderType == EMatchFinderType.BT2)
numHashBytes = 2;
bt.SetType(numHashBytes);
_matchFinder = bt;
}
_literalEncoder.Create(_numLiteralPosStateBits, _numLiteralContextBits);
if (_dictionarySize == _dictionarySizePrev && _numFastBytesPrev == _numFastBytes)
return;
_matchFinder.Create(_dictionarySize, kNumOpts, _numFastBytes, LZMABase.kMatchMaxLen + 1);
_dictionarySizePrev = _dictionarySize;
_numFastBytesPrev = _numFastBytes;
}
public void SetCoderProperties(CoderPropID[] propIDs, object[] properties)
{
for (UInt32 i = 0; i < properties.Length; i++)
{
object prop = properties[i];
switch (propIDs[i])
{
case CoderPropID.NumFastBytes:
{
if (!(prop is Int32))
throw new Exception();
Int32 numFastBytes = (Int32)prop;
if (numFastBytes < 5 || numFastBytes > LZMABase.kMatchMaxLen)
throw new Exception();
_numFastBytes = (UInt32)numFastBytes;
break;
}
case CoderPropID.Algorithm:
{
break;
}
case CoderPropID.MatchFinder:
{
if (!(prop is String))
throw new Exception();
EMatchFinderType matchFinderIndexPrev = _matchFinderType;
int m = FindMatchFinder(((string)prop).ToUpper());
if (m < 0)
throw new Exception();
_matchFinderType = (EMatchFinderType)m;
if (_matchFinder != null && matchFinderIndexPrev != _matchFinderType)
{
_dictionarySizePrev = 0xFFFFFFFF;
_matchFinder = null;
}
break;
}
case CoderPropID.DictionarySize:
{
const int kDicLogSizeMaxCompress = 30;
if (!(prop is Int32))
throw new Exception(); ;
Int32 dictionarySize = (Int32)prop;
if (dictionarySize < (UInt32)(1 << LZMABase.kDicLogSizeMin) ||
dictionarySize > (UInt32)(1 << kDicLogSizeMaxCompress))
throw new Exception();
_dictionarySize = (UInt32)dictionarySize;
int dicLogSize;
for (dicLogSize = 0; dicLogSize < (UInt32)kDicLogSizeMaxCompress; dicLogSize++)
if (dictionarySize <= ((UInt32)(1) << dicLogSize))
break;
_distTableSize = (UInt32)dicLogSize * 2;
break;
}
case CoderPropID.PosStateBits:
{
if (!(prop is Int32))
throw new Exception();
Int32 v = (Int32)prop;
if (v < 0 || v > (UInt32)LZMABase.kNumPosStatesBitsEncodingMax)
throw new Exception();
_posStateBits = (int)v;
_posStateMask = (((UInt32)1) << (int)_posStateBits) - 1;
break;
}
case CoderPropID.LitPosBits:
{
if (!(prop is Int32))
throw new Exception();
Int32 v = (Int32)prop;
if (v < 0 || v > (UInt32)LZMABase.kNumLitPosStatesBitsEncodingMax)
throw new Exception();
_numLiteralPosStateBits = (int)v;
break;
}
case CoderPropID.LitContextBits:
{
if (!(prop is Int32))
throw new Exception();
Int32 v = (Int32)prop;
if (v < 0 || v > (UInt32)LZMABase.kNumLitContextBitsMax)
throw new Exception(); ;
_numLiteralContextBits = (int)v;
break;
}
case CoderPropID.EndMarker:
{
if (!(prop is Boolean))
throw new Exception();
SetWriteEndMarkerMode((Boolean)prop);
break;
}
default:
throw new Exception();
}
}
}
