misc/libphysfs/lzma/CS/7zip/Compress/LZMA/LzmaEncoder.cs
changeset 12218 bb5522e88ab2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CS/7zip/Compress/LZMA/LzmaEncoder.cs	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,1480 @@
+// LzmaEncoder.cs
+
+using System;
+
+namespace SevenZip.Compression.LZMA
+{
+	using RangeCoder;
+
+	public class Encoder : ICoder, ISetCoderProperties, IWriteCoderProperties
+	{
+		enum EMatchFinderType
+		{
+			BT2,
+			BT4,
+		};
+
+		const UInt32 kIfinityPrice = 0xFFFFFFF;
+
+		static Byte[] g_FastPos = new Byte[1 << 11];
+
+		static Encoder()
+		{
+			const Byte kFastSlots = 22;
+			int c = 2;
+			g_FastPos[0] = 0;
+			g_FastPos[1] = 1;
+			for (Byte slotFast = 2; slotFast < kFastSlots; slotFast++)
+			{
+				UInt32 k = ((UInt32)1 << ((slotFast >> 1) - 1));
+				for (UInt32 j = 0; j < k; j++, c++)
+					g_FastPos[c] = slotFast;
+			}
+		}
+
+		static UInt32 GetPosSlot(UInt32 pos)
+		{
+			if (pos < (1 << 11))
+				return g_FastPos[pos];
+			if (pos < (1 << 21))
+				return (UInt32)(g_FastPos[pos >> 10] + 20);
+			return (UInt32)(g_FastPos[pos >> 20] + 40);
+		}
+
+		static UInt32 GetPosSlot2(UInt32 pos)
+		{
+			if (pos < (1 << 17))
+				return (UInt32)(g_FastPos[pos >> 6] + 12);
+			if (pos < (1 << 27))
+				return (UInt32)(g_FastPos[pos >> 16] + 32);
+			return (UInt32)(g_FastPos[pos >> 26] + 52);
+		}
+
+		Base.State _state = new Base.State();
+		Byte _previousByte;
+		UInt32[] _repDistances = new UInt32[Base.kNumRepDistances];
+
+		void BaseInit()
+		{
+			_state.Init();
+			_previousByte = 0;
+			for (UInt32 i = 0; i < Base.kNumRepDistances; i++)
+				_repDistances[i] = 0;
+		}
+
+		const int kDefaultDictionaryLogSize = 22;
+		const UInt32 kNumFastBytesDefault = 0x20;
+
+		class LiteralEncoder
+		{
+			public struct Encoder2
+			{
+				BitEncoder[] m_Encoders;
+
+				public void Create() { m_Encoders = new BitEncoder[0x300]; }
+
+				public void Init() { for (int i = 0; i < 0x300; i++) m_Encoders[i].Init(); }
+
+				public void Encode(RangeCoder.Encoder rangeEncoder, byte symbol)
+				{
+					uint context = 1;
+					for (int i = 7; i >= 0; i--)
+					{
+						uint bit = (uint)((symbol >> i) & 1);
+						m_Encoders[context].Encode(rangeEncoder, bit);
+						context = (context << 1) | bit;
+					}
+				}
+
+				public void EncodeMatched(RangeCoder.Encoder rangeEncoder, byte matchByte, byte symbol)
+				{
+					uint context = 1;
+					bool same = true;
+					for (int i = 7; i >= 0; i--)
+					{
+						uint bit = (uint)((symbol >> i) & 1);
+						uint state = context;
+						if (same)
+						{
+							uint matchBit = (uint)((matchByte >> i) & 1);
+							state += ((1 + matchBit) << 8);
+							same = (matchBit == bit);
+						}
+						m_Encoders[state].Encode(rangeEncoder, bit);
+						context = (context << 1) | bit;
+					}
+				}
+
+				public uint GetPrice(bool matchMode, byte matchByte, byte symbol)
+				{
+					uint price = 0;
+					uint context = 1;
+					int i = 7;
+					if (matchMode)
+					{
+						for (; i >= 0; i--)
+						{
+							uint matchBit = (uint)(matchByte >> i) & 1;
+							uint bit = (uint)(symbol >> i) & 1;
+							price += m_Encoders[((1 + matchBit) << 8) + context].GetPrice(bit);
+							context = (context << 1) | bit;
+							if (matchBit != bit)
+							{
+								i--;
+								break;
+							}
+						}
+					}
+					for (; i >= 0; i--)
+					{
+						uint bit = (uint)(symbol >> i) & 1;
+						price += m_Encoders[context].GetPrice(bit);
+						context = (context << 1) | bit;
+					}
+					return price;
+				}
+			}
+
+			Encoder2[] m_Coders;
+			int m_NumPrevBits;
+			int m_NumPosBits;
+			uint m_PosMask;
+
+			public void Create(int numPosBits, int numPrevBits)
+			{
+				if (m_Coders != null && m_NumPrevBits == numPrevBits && m_NumPosBits == numPosBits)
+					return;
+				m_NumPosBits = numPosBits;
+				m_PosMask = ((uint)1 << numPosBits) - 1;
+				m_NumPrevBits = numPrevBits;
+				uint numStates = (uint)1 << (m_NumPrevBits + m_NumPosBits);
+				m_Coders = new Encoder2[numStates];
+				for (uint i = 0; i < numStates; i++)
+					m_Coders[i].Create();
+			}
+
+			public void Init()
+			{
+				uint numStates = (uint)1 << (m_NumPrevBits + m_NumPosBits);
+				for (uint i = 0; i < numStates; i++)
+					m_Coders[i].Init();
+			}
+
+			public Encoder2 GetSubCoder(UInt32 pos, Byte prevByte)
+			{ return m_Coders[((pos & m_PosMask) << m_NumPrevBits) + (uint)(prevByte >> (8 - m_NumPrevBits))]; }
+		}
+
+		class LenEncoder
+		{
+			RangeCoder.BitEncoder _choice = new RangeCoder.BitEncoder();
+			RangeCoder.BitEncoder _choice2 = new RangeCoder.BitEncoder();
+			RangeCoder.BitTreeEncoder[] _lowCoder = new RangeCoder.BitTreeEncoder[Base.kNumPosStatesEncodingMax];
+			RangeCoder.BitTreeEncoder[] _midCoder = new RangeCoder.BitTreeEncoder[Base.kNumPosStatesEncodingMax];
+			RangeCoder.BitTreeEncoder _highCoder = new RangeCoder.BitTreeEncoder(Base.kNumHighLenBits);
+
+			public LenEncoder()
+			{
+				for (UInt32 posState = 0; posState < Base.kNumPosStatesEncodingMax; posState++)
+				{
+					_lowCoder[posState] = new RangeCoder.BitTreeEncoder(Base.kNumLowLenBits);
+					_midCoder[posState] = new RangeCoder.BitTreeEncoder(Base.kNumMidLenBits);
+				}
+			}
+
+			public void Init(UInt32 numPosStates)
+			{
+				_choice.Init();
+				_choice2.Init();
+				for (UInt32 posState = 0; posState < numPosStates; posState++)
+				{
+					_lowCoder[posState].Init();
+					_midCoder[posState].Init();
+				}
+				_highCoder.Init();
+			}
+
+			public void Encode(RangeCoder.Encoder rangeEncoder, UInt32 symbol, UInt32 posState)
+			{
+				if (symbol < Base.kNumLowLenSymbols)
+				{
+					_choice.Encode(rangeEncoder, 0);
+					_lowCoder[posState].Encode(rangeEncoder, symbol);
+				}
+				else
+				{
+					symbol -= Base.kNumLowLenSymbols;
+					_choice.Encode(rangeEncoder, 1);
+					if (symbol < Base.kNumMidLenSymbols)
+					{
+						_choice2.Encode(rangeEncoder, 0);
+						_midCoder[posState].Encode(rangeEncoder, symbol);
+					}
+					else
+					{
+						_choice2.Encode(rangeEncoder, 1);
+						_highCoder.Encode(rangeEncoder, symbol - Base.kNumMidLenSymbols);
+					}
+				}
+			}
+
+			public void SetPrices(UInt32 posState, UInt32 numSymbols, UInt32[] prices, UInt32 st)
+			{
+				UInt32 a0 = _choice.GetPrice0();
+				UInt32 a1 = _choice.GetPrice1();
+				UInt32 b0 = a1 + _choice2.GetPrice0();
+				UInt32 b1 = a1 + _choice2.GetPrice1();
+				UInt32 i = 0;
+				for (i = 0; i < Base.kNumLowLenSymbols; i++)
+				{
+					if (i >= numSymbols)
+						return;
+					prices[st + i] = a0 + _lowCoder[posState].GetPrice(i);
+				}
+				for (; i < Base.kNumLowLenSymbols + Base.kNumMidLenSymbols; i++)
+				{
+					if (i >= numSymbols)
+						return;
+					prices[st + i] = b0 + _midCoder[posState].GetPrice(i - Base.kNumLowLenSymbols);
+				}
+				for (; i < numSymbols; i++)
+					prices[st + i] = b1 + _highCoder.GetPrice(i - Base.kNumLowLenSymbols - Base.kNumMidLenSymbols);
+			}
+		};
+
+		const UInt32 kNumLenSpecSymbols = Base.kNumLowLenSymbols + Base.kNumMidLenSymbols;
+
+		class LenPriceTableEncoder : LenEncoder
+		{
+			UInt32[] _prices = new UInt32[Base.kNumLenSymbols << Base.kNumPosStatesBitsEncodingMax];
+			UInt32 _tableSize;
+			UInt32[] _counters = new UInt32[Base.kNumPosStatesEncodingMax];
+
+			public void SetTableSize(UInt32 tableSize) { _tableSize = tableSize; }
+
+			public UInt32 GetPrice(UInt32 symbol, UInt32 posState)
+			{
+				return _prices[posState * Base.kNumLenSymbols + symbol];
+			}
+
+			void UpdateTable(UInt32 posState)
+			{
+				SetPrices(posState, _tableSize, _prices, posState * Base.kNumLenSymbols);
+				_counters[posState] = _tableSize;
+			}
+
+			public void UpdateTables(UInt32 numPosStates)
+			{
+				for (UInt32 posState = 0; posState < numPosStates; posState++)
+					UpdateTable(posState);
+			}
+
+			public new void Encode(RangeCoder.Encoder rangeEncoder, UInt32 symbol, UInt32 posState)
+			{
+				base.Encode(rangeEncoder, symbol, posState);
+				if (--_counters[posState] == 0)
+					UpdateTable(posState);
+			}
+		}
+
+		const UInt32 kNumOpts = 1 << 12;
+		class Optimal
+		{
+			public Base.State State;
+
+			public bool Prev1IsChar;
+			public bool Prev2;
+
+			public UInt32 PosPrev2;
+			public UInt32 BackPrev2;
+
+			public UInt32 Price;
+			public UInt32 PosPrev;
+			public UInt32 BackPrev;
+
+			public UInt32 Backs0;
+			public UInt32 Backs1;
+			public UInt32 Backs2;
+			public UInt32 Backs3;
+
+			public void MakeAsChar() { BackPrev = 0xFFFFFFFF; Prev1IsChar = false; }
+			public void MakeAsShortRep() { BackPrev = 0; ; Prev1IsChar = false; }
+			public bool IsShortRep() { return (BackPrev == 0); }
+		};
+		Optimal[] _optimum = new Optimal[kNumOpts];
+		LZ.IMatchFinder _matchFinder = null;
+		RangeCoder.Encoder _rangeEncoder = new RangeCoder.Encoder();
+
+		RangeCoder.BitEncoder[] _isMatch = new RangeCoder.BitEncoder[Base.kNumStates << Base.kNumPosStatesBitsMax];
+		RangeCoder.BitEncoder[] _isRep = new RangeCoder.BitEncoder[Base.kNumStates];
+		RangeCoder.BitEncoder[] _isRepG0 = new RangeCoder.BitEncoder[Base.kNumStates];
+		RangeCoder.BitEncoder[] _isRepG1 = new RangeCoder.BitEncoder[Base.kNumStates];
+		RangeCoder.BitEncoder[] _isRepG2 = new RangeCoder.BitEncoder[Base.kNumStates];
+		RangeCoder.BitEncoder[] _isRep0Long = new RangeCoder.BitEncoder[Base.kNumStates << Base.kNumPosStatesBitsMax];
+
+		RangeCoder.BitTreeEncoder[] _posSlotEncoder = new RangeCoder.BitTreeEncoder[Base.kNumLenToPosStates];
+		
+		RangeCoder.BitEncoder[] _posEncoders = new RangeCoder.BitEncoder[Base.kNumFullDistances - Base.kEndPosModelIndex];
+		RangeCoder.BitTreeEncoder _posAlignEncoder = new RangeCoder.BitTreeEncoder(Base.kNumAlignBits);
+
+		LenPriceTableEncoder _lenEncoder = new LenPriceTableEncoder();
+		LenPriceTableEncoder _repMatchLenEncoder = new LenPriceTableEncoder();
+
+		LiteralEncoder _literalEncoder = new LiteralEncoder();
+
+		UInt32[] _matchDistances = new UInt32[Base.kMatchMaxLen * 2 + 2];
+		
+		UInt32 _numFastBytes = kNumFastBytesDefault;
+		UInt32 _longestMatchLength;
+		UInt32 _numDistancePairs;
+
+		UInt32 _additionalOffset;
+
+		UInt32 _optimumEndIndex;
+		UInt32 _optimumCurrentIndex;
+
+		bool _longestMatchWasFound;
+
+		UInt32[] _posSlotPrices = new UInt32[1 << (Base.kNumPosSlotBits + Base.kNumLenToPosStatesBits)];
+		UInt32[] _distancesPrices = new UInt32[Base.kNumFullDistances << Base.kNumLenToPosStatesBits];
+		UInt32[] _alignPrices = new UInt32[Base.kAlignTableSize];
+		UInt32 _alignPriceCount;
+
+		UInt32 _distTableSize = (kDefaultDictionaryLogSize * 2);
+
+		int _posStateBits = 2;
+		UInt32 _posStateMask = (4 - 1);
+		int _numLiteralPosStateBits = 0;
+		int _numLiteralContextBits = 3;
+
+		UInt32 _dictionarySize = (1 << kDefaultDictionaryLogSize);
+		UInt32 _dictionarySizePrev = 0xFFFFFFFF;
+		UInt32 _numFastBytesPrev = 0xFFFFFFFF;
+
+		Int64 nowPos64;
+		bool _finished;
+		System.IO.Stream _inStream;
+
+		EMatchFinderType _matchFinderType = EMatchFinderType.BT4;
+		bool _writeEndMark = false;
+		
+		bool _needReleaseMFStream;
+
+		void Create()
+		{
+			if (_matchFinder == null)
+			{
+				LZ.BinTree bt = new LZ.BinTree();
+				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, Base.kMatchMaxLen + 1);
+			_dictionarySizePrev = _dictionarySize;
+			_numFastBytesPrev = _numFastBytes;
+		}
+
+		public Encoder()
+		{
+			for (int i = 0; i < kNumOpts; i++)
+				_optimum[i] = new Optimal();
+			for (int i = 0; i < Base.kNumLenToPosStates; i++)
+				_posSlotEncoder[i] = new RangeCoder.BitTreeEncoder(Base.kNumPosSlotBits);
+		}
+
+		void SetWriteEndMarkerMode(bool writeEndMarker)
+		{
+			_writeEndMark = writeEndMarker;
+		}
+
+		void Init()
+		{
+			BaseInit();
+			_rangeEncoder.Init();
+
+			uint i;
+			for (i = 0; i < Base.kNumStates; i++)
+			{
+				for (uint j = 0; j <= _posStateMask; j++)
+				{
+					uint complexState = (i << Base.kNumPosStatesBitsMax) + j;
+					_isMatch[complexState].Init();
+					_isRep0Long[complexState].Init();
+				}
+				_isRep[i].Init();
+				_isRepG0[i].Init();
+				_isRepG1[i].Init();
+				_isRepG2[i].Init();
+			}
+			_literalEncoder.Init();
+			for (i = 0; i < Base.kNumLenToPosStates; i++)
+				_posSlotEncoder[i].Init();
+			for (i = 0; i < Base.kNumFullDistances - Base.kEndPosModelIndex; i++)
+				_posEncoders[i].Init();
+
+			_lenEncoder.Init((UInt32)1 << _posStateBits);
+			_repMatchLenEncoder.Init((UInt32)1 << _posStateBits);
+
+			_posAlignEncoder.Init();
+
+			_longestMatchWasFound = false;
+			_optimumEndIndex = 0;
+			_optimumCurrentIndex = 0;
+			_additionalOffset = 0;
+		}
+
+		void ReadMatchDistances(out UInt32 lenRes, out UInt32 numDistancePairs)
+		{
+			lenRes = 0;
+			numDistancePairs = _matchFinder.GetMatches(_matchDistances);
+			if (numDistancePairs > 0)
+			{
+				lenRes = _matchDistances[numDistancePairs - 2];
+				if (lenRes == _numFastBytes)
+					lenRes += _matchFinder.GetMatchLen((int)lenRes - 1, _matchDistances[numDistancePairs - 1],
+						Base.kMatchMaxLen - lenRes);
+			}
+			_additionalOffset++;
+		}
+
+
+		void MovePos(UInt32 num)
+		{
+			if (num > 0)
+			{
+				_matchFinder.Skip(num);
+				_additionalOffset += num;
+			}
+		}
+
+		UInt32 GetRepLen1Price(Base.State state, UInt32 posState)
+		{
+			return _isRepG0[state.Index].GetPrice0() +
+					_isRep0Long[(state.Index << Base.kNumPosStatesBitsMax) + posState].GetPrice0();
+		}
+
+		UInt32 GetPureRepPrice(UInt32 repIndex, Base.State state, UInt32 posState)
+		{
+			UInt32 price;
+			if (repIndex == 0)
+			{
+				price = _isRepG0[state.Index].GetPrice0();
+				price += _isRep0Long[(state.Index << Base.kNumPosStatesBitsMax) + posState].GetPrice1();
+			}
+			else
+			{
+				price = _isRepG0[state.Index].GetPrice1();
+				if (repIndex == 1)
+					price += _isRepG1[state.Index].GetPrice0();
+				else
+				{
+					price += _isRepG1[state.Index].GetPrice1();
+					price += _isRepG2[state.Index].GetPrice(repIndex - 2);
+				}
+			}
+			return price;
+		}
+
+		UInt32 GetRepPrice(UInt32 repIndex, UInt32 len, Base.State state, UInt32 posState)
+		{
+			UInt32 price = _repMatchLenEncoder.GetPrice(len - Base.kMatchMinLen, posState);
+			return price + GetPureRepPrice(repIndex, state, posState);
+		}
+	
+		UInt32 GetPosLenPrice(UInt32 pos, UInt32 len, UInt32 posState)
+		{
+			UInt32 price;
+			UInt32 lenToPosState = Base.GetLenToPosState(len);
+			if (pos < Base.kNumFullDistances)
+				price = _distancesPrices[(lenToPosState * Base.kNumFullDistances) + pos];
+			else
+				price = _posSlotPrices[(lenToPosState << Base.kNumPosSlotBits) + GetPosSlot2(pos)] +
+					_alignPrices[pos & Base.kAlignMask];
+			return price + _lenEncoder.GetPrice(len - Base.kMatchMinLen, posState);
+		}
+
+		UInt32 Backward(out UInt32 backRes, UInt32 cur)
+		{
+			_optimumEndIndex = cur;
+			UInt32 posMem = _optimum[cur].PosPrev;
+			UInt32 backMem = _optimum[cur].BackPrev;
+			do
+			{
+				if (_optimum[cur].Prev1IsChar)
+				{
+					_optimum[posMem].MakeAsChar();
+					_optimum[posMem].PosPrev = posMem - 1;
+					if (_optimum[cur].Prev2)
+					{
+						_optimum[posMem - 1].Prev1IsChar = false;
+						_optimum[posMem - 1].PosPrev = _optimum[cur].PosPrev2;
+						_optimum[posMem - 1].BackPrev = _optimum[cur].BackPrev2;
+					}
+				}
+				UInt32 posPrev = posMem;
+				UInt32 backCur = backMem;
+
+				backMem = _optimum[posPrev].BackPrev;
+				posMem = _optimum[posPrev].PosPrev;
+
+				_optimum[posPrev].BackPrev = backCur;
+				_optimum[posPrev].PosPrev = cur;
+				cur = posPrev;
+			}
+			while (cur > 0);
+			backRes = _optimum[0].BackPrev;
+			_optimumCurrentIndex = _optimum[0].PosPrev;
+			return _optimumCurrentIndex;
+		}
+
+		UInt32[] reps = new UInt32[Base.kNumRepDistances];
+		UInt32[] repLens = new UInt32[Base.kNumRepDistances];
+
+
+		UInt32 GetOptimum(UInt32 position, out UInt32 backRes)
+		{
+			if (_optimumEndIndex != _optimumCurrentIndex)
+			{
+				UInt32 lenRes = _optimum[_optimumCurrentIndex].PosPrev - _optimumCurrentIndex;
+				backRes = _optimum[_optimumCurrentIndex].BackPrev;
+				_optimumCurrentIndex = _optimum[_optimumCurrentIndex].PosPrev;
+				return lenRes;
+			}
+			_optimumCurrentIndex = _optimumEndIndex = 0;
+
+			UInt32 lenMain, numDistancePairs;
+			if (!_longestMatchWasFound)
+			{
+				ReadMatchDistances(out lenMain, out numDistancePairs);
+			}
+			else
+			{
+				lenMain = _longestMatchLength;
+				numDistancePairs = _numDistancePairs;
+				_longestMatchWasFound = false;
+			}
+
+			UInt32 numAvailableBytes = _matchFinder.GetNumAvailableBytes() + 1;
+			if (numAvailableBytes < 2)
+			{
+				backRes = 0xFFFFFFFF;
+				return 1;
+			}
+			if (numAvailableBytes > Base.kMatchMaxLen)
+				numAvailableBytes = Base.kMatchMaxLen;
+
+			UInt32 repMaxIndex = 0;
+			UInt32 i;			
+			for (i = 0; i < Base.kNumRepDistances; i++)
+			{
+				reps[i] = _repDistances[i];
+				repLens[i] = _matchFinder.GetMatchLen(0 - 1, reps[i], Base.kMatchMaxLen);
+				if (repLens[i] > repLens[repMaxIndex])
+					repMaxIndex = i;
+			}
+			if (repLens[repMaxIndex] >= _numFastBytes)
+			{
+				backRes = repMaxIndex;
+				UInt32 lenRes = repLens[repMaxIndex];
+				MovePos(lenRes - 1);
+				return lenRes;
+			}
+
+			if (lenMain >= _numFastBytes)
+			{
+				backRes = _matchDistances[numDistancePairs - 1] + Base.kNumRepDistances;
+				MovePos(lenMain - 1);
+				return lenMain;
+			}
+			
+			Byte currentByte = _matchFinder.GetIndexByte(0 - 1);
+			Byte matchByte = _matchFinder.GetIndexByte((Int32)(0 - _repDistances[0] - 1 - 1));
+
+			if (lenMain < 2 && currentByte != matchByte && repLens[repMaxIndex] < 2)
+			{
+				backRes = (UInt32)0xFFFFFFFF;
+				return 1;
+			}
+
+			_optimum[0].State = _state;
+
+			UInt32 posState = (position & _posStateMask);
+
+			_optimum[1].Price = _isMatch[(_state.Index << Base.kNumPosStatesBitsMax) + posState].GetPrice0() +
+					_literalEncoder.GetSubCoder(position, _previousByte).GetPrice(!_state.IsCharState(), matchByte, currentByte);
+			_optimum[1].MakeAsChar();
+
+			UInt32 matchPrice = _isMatch[(_state.Index << Base.kNumPosStatesBitsMax) + posState].GetPrice1();
+			UInt32 repMatchPrice = matchPrice + _isRep[_state.Index].GetPrice1();
+
+			if (matchByte == currentByte)
+			{
+				UInt32 shortRepPrice = repMatchPrice + GetRepLen1Price(_state, posState);
+				if (shortRepPrice < _optimum[1].Price)
+				{
+					_optimum[1].Price = shortRepPrice;
+					_optimum[1].MakeAsShortRep();
+				}
+			}
+
+			UInt32 lenEnd = ((lenMain >= repLens[repMaxIndex]) ? lenMain : repLens[repMaxIndex]);
+
+			if(lenEnd < 2)
+			{
+				backRes = _optimum[1].BackPrev;
+				return 1;
+			}
+			
+			_optimum[1].PosPrev = 0;
+
+			_optimum[0].Backs0 = reps[0];
+			_optimum[0].Backs1 = reps[1];
+			_optimum[0].Backs2 = reps[2];
+			_optimum[0].Backs3 = reps[3];
+
+			UInt32 len = lenEnd;
+			do
+				_optimum[len--].Price = kIfinityPrice;
+			while (len >= 2);
+
+			for (i = 0; i < Base.kNumRepDistances; i++)
+			{
+				UInt32 repLen = repLens[i];
+				if (repLen < 2)
+					continue;
+				UInt32 price = repMatchPrice + GetPureRepPrice(i, _state, posState);
+				do
+				{
+					UInt32 curAndLenPrice = price + _repMatchLenEncoder.GetPrice(repLen - 2, posState);
+					Optimal optimum = _optimum[repLen];
+					if (curAndLenPrice < optimum.Price)
+					{
+						optimum.Price = curAndLenPrice;
+						optimum.PosPrev = 0;
+						optimum.BackPrev = i;
+						optimum.Prev1IsChar = false;
+					}
+				}
+				while (--repLen >= 2);
+			}
+
+			UInt32 normalMatchPrice = matchPrice + _isRep[_state.Index].GetPrice0();
+			
+			len = ((repLens[0] >= 2) ? repLens[0] + 1 : 2);
+			if (len <= lenMain)
+			{
+				UInt32 offs = 0;
+				while (len > _matchDistances[offs])
+					offs += 2;
+				for (; ; len++)
+				{
+					UInt32 distance = _matchDistances[offs + 1];
+					UInt32 curAndLenPrice = normalMatchPrice + GetPosLenPrice(distance, len, posState);
+					Optimal optimum = _optimum[len];
+					if (curAndLenPrice < optimum.Price)
+					{
+						optimum.Price = curAndLenPrice;
+						optimum.PosPrev = 0;
+						optimum.BackPrev = distance + Base.kNumRepDistances;
+						optimum.Prev1IsChar = false;
+					}
+					if (len == _matchDistances[offs])
+					{
+						offs += 2;
+						if (offs == numDistancePairs)
+							break;
+					}
+				}
+			}
+
+			UInt32 cur = 0;
+
+			while (true)
+			{
+				cur++;
+				if (cur == lenEnd)
+					return Backward(out backRes, cur);
+				UInt32 newLen;
+				ReadMatchDistances(out newLen, out numDistancePairs);
+				if (newLen >= _numFastBytes)
+				{
+					_numDistancePairs = numDistancePairs;
+					_longestMatchLength = newLen;
+					_longestMatchWasFound = true;
+					return Backward(out backRes, cur);
+				}
+				position++;
+				UInt32 posPrev = _optimum[cur].PosPrev;
+				Base.State state;
+				if (_optimum[cur].Prev1IsChar)
+				{
+					posPrev--;
+					if (_optimum[cur].Prev2)
+					{
+						state = _optimum[_optimum[cur].PosPrev2].State;
+						if (_optimum[cur].BackPrev2 < Base.kNumRepDistances)
+							state.UpdateRep();
+						else
+							state.UpdateMatch();
+					}
+					else
+						state = _optimum[posPrev].State;
+					state.UpdateChar();
+				}
+				else
+					state = _optimum[posPrev].State;
+				if (posPrev == cur - 1)
+				{
+					if (_optimum[cur].IsShortRep())
+						state.UpdateShortRep();
+					else
+						state.UpdateChar();
+				}
+				else
+				{
+					UInt32 pos;
+					if (_optimum[cur].Prev1IsChar && _optimum[cur].Prev2)
+					{
+						posPrev = _optimum[cur].PosPrev2;
+						pos = _optimum[cur].BackPrev2;
+						state.UpdateRep();
+					}
+					else
+					{
+						pos = _optimum[cur].BackPrev;
+						if (pos < Base.kNumRepDistances)
+							state.UpdateRep();
+						else
+							state.UpdateMatch();
+					}
+					Optimal opt = _optimum[posPrev];
+					if (pos < Base.kNumRepDistances)
+					{
+						if (pos == 0)
+						{
+							reps[0] = opt.Backs0;
+							reps[1] = opt.Backs1;
+							reps[2] = opt.Backs2;
+							reps[3] = opt.Backs3;
+						}
+						else if (pos == 1)
+						{
+							reps[0] = opt.Backs1;
+							reps[1] = opt.Backs0;
+							reps[2] = opt.Backs2;
+							reps[3] = opt.Backs3;
+						}
+						else if (pos == 2)
+						{
+							reps[0] = opt.Backs2;
+							reps[1] = opt.Backs0;
+							reps[2] = opt.Backs1;
+							reps[3] = opt.Backs3;
+						}
+						else
+						{
+							reps[0] = opt.Backs3;
+							reps[1] = opt.Backs0;
+							reps[2] = opt.Backs1;
+							reps[3] = opt.Backs2;
+						}
+					}
+					else
+					{
+						reps[0] = (pos - Base.kNumRepDistances);
+						reps[1] = opt.Backs0;
+						reps[2] = opt.Backs1;
+						reps[3] = opt.Backs2;
+					}
+				}
+				_optimum[cur].State = state;
+				_optimum[cur].Backs0 = reps[0];
+				_optimum[cur].Backs1 = reps[1];
+				_optimum[cur].Backs2 = reps[2];
+				_optimum[cur].Backs3 = reps[3];
+				UInt32 curPrice = _optimum[cur].Price;
+
+				currentByte = _matchFinder.GetIndexByte(0 - 1);
+				matchByte = _matchFinder.GetIndexByte((Int32)(0 - reps[0] - 1 - 1));
+
+				posState = (position & _posStateMask);
+
+				UInt32 curAnd1Price = curPrice +
+					_isMatch[(state.Index << Base.kNumPosStatesBitsMax) + posState].GetPrice0() +
+					_literalEncoder.GetSubCoder(position, _matchFinder.GetIndexByte(0 - 2)).
+					GetPrice(!state.IsCharState(), matchByte, currentByte);
+
+				Optimal nextOptimum = _optimum[cur + 1];
+
+				bool nextIsChar = false;
+				if (curAnd1Price < nextOptimum.Price)
+				{
+					nextOptimum.Price = curAnd1Price;
+					nextOptimum.PosPrev = cur;
+					nextOptimum.MakeAsChar();
+					nextIsChar = true;
+				}
+
+				matchPrice = curPrice + _isMatch[(state.Index << Base.kNumPosStatesBitsMax) + posState].GetPrice1();
+				repMatchPrice = matchPrice + _isRep[state.Index].GetPrice1();
+
+				if (matchByte == currentByte &&
+					!(nextOptimum.PosPrev < cur && nextOptimum.BackPrev == 0))
+				{
+					UInt32 shortRepPrice = repMatchPrice + GetRepLen1Price(state, posState);
+					if (shortRepPrice <= nextOptimum.Price)
+					{
+						nextOptimum.Price = shortRepPrice;
+						nextOptimum.PosPrev = cur;
+						nextOptimum.MakeAsShortRep();
+						nextIsChar = true;
+					}
+				}
+
+				UInt32 numAvailableBytesFull = _matchFinder.GetNumAvailableBytes() + 1;
+				numAvailableBytesFull = Math.Min(kNumOpts - 1 - cur, numAvailableBytesFull);
+				numAvailableBytes = numAvailableBytesFull;
+
+				if (numAvailableBytes < 2)
+					continue;
+				if (numAvailableBytes > _numFastBytes)
+					numAvailableBytes = _numFastBytes;
+				if (!nextIsChar && matchByte != currentByte)
+				{
+					// try Literal + rep0
+					UInt32 t = Math.Min(numAvailableBytesFull - 1, _numFastBytes);
+					UInt32 lenTest2 = _matchFinder.GetMatchLen(0, reps[0], t);
+					if (lenTest2 >= 2)
+					{
+						Base.State state2 = state;
+						state2.UpdateChar();
+						UInt32 posStateNext = (position + 1) & _posStateMask;
+						UInt32 nextRepMatchPrice = curAnd1Price +
+							_isMatch[(state2.Index << Base.kNumPosStatesBitsMax) + posStateNext].GetPrice1() +
+							_isRep[state2.Index].GetPrice1();
+						{
+							UInt32 offset = cur + 1 + lenTest2;
+							while (lenEnd < offset)
+								_optimum[++lenEnd].Price = kIfinityPrice;
+							UInt32 curAndLenPrice = nextRepMatchPrice + GetRepPrice(
+								0, lenTest2, state2, posStateNext);
+							Optimal optimum = _optimum[offset];
+							if (curAndLenPrice < optimum.Price)
+							{
+								optimum.Price = curAndLenPrice;
+								optimum.PosPrev = cur + 1;
+								optimum.BackPrev = 0;
+								optimum.Prev1IsChar = true;
+								optimum.Prev2 = false;
+							}
+						}
+					}
+				}
+
+				UInt32 startLen = 2; // speed optimization 
+
+				for (UInt32 repIndex = 0; repIndex < Base.kNumRepDistances; repIndex++)
+				{
+					UInt32 lenTest = _matchFinder.GetMatchLen(0 - 1, reps[repIndex], numAvailableBytes);
+					if (lenTest < 2)
+						continue;
+					UInt32 lenTestTemp = lenTest;
+					do
+					{
+						while (lenEnd < cur + lenTest)
+							_optimum[++lenEnd].Price = kIfinityPrice;
+						UInt32 curAndLenPrice = repMatchPrice + GetRepPrice(repIndex, lenTest, state, posState);
+						Optimal optimum = _optimum[cur + lenTest];
+						if (curAndLenPrice < optimum.Price)
+						{
+							optimum.Price = curAndLenPrice;
+							optimum.PosPrev = cur;
+							optimum.BackPrev = repIndex;
+							optimum.Prev1IsChar = false;
+						}
+					}
+					while(--lenTest >= 2);
+					lenTest = lenTestTemp;
+
+					if (repIndex == 0)
+						startLen = lenTest + 1;
+
+					// if (_maxMode)
+					if (lenTest < numAvailableBytesFull)
+					{
+						UInt32 t = Math.Min(numAvailableBytesFull - 1 - lenTest, _numFastBytes);
+						UInt32 lenTest2 = _matchFinder.GetMatchLen((Int32)lenTest, reps[repIndex], t);
+						if (lenTest2 >= 2)
+						{
+							Base.State state2 = state;
+							state2.UpdateRep();
+							UInt32 posStateNext = (position + lenTest) & _posStateMask;
+							UInt32 curAndLenCharPrice = 
+									repMatchPrice + GetRepPrice(repIndex, lenTest, state, posState) + 
+									_isMatch[(state2.Index << Base.kNumPosStatesBitsMax) + posStateNext].GetPrice0() +
+									_literalEncoder.GetSubCoder(position + lenTest, 
+									_matchFinder.GetIndexByte((Int32)lenTest - 1 - 1)).GetPrice(true,
+									_matchFinder.GetIndexByte((Int32)((Int32)lenTest - 1 - (Int32)(reps[repIndex] + 1))), 
+									_matchFinder.GetIndexByte((Int32)lenTest - 1));
+							state2.UpdateChar();
+							posStateNext = (position + lenTest + 1) & _posStateMask;
+							UInt32 nextMatchPrice = curAndLenCharPrice + _isMatch[(state2.Index << Base.kNumPosStatesBitsMax) + posStateNext].GetPrice1();
+							UInt32 nextRepMatchPrice = nextMatchPrice + _isRep[state2.Index].GetPrice1();
+							
+							// for(; lenTest2 >= 2; lenTest2--)
+							{
+								UInt32 offset = lenTest + 1 + lenTest2;
+								while(lenEnd < cur + offset)
+									_optimum[++lenEnd].Price = kIfinityPrice;
+								UInt32 curAndLenPrice = nextRepMatchPrice + GetRepPrice(0, lenTest2, state2, posStateNext);
+								Optimal optimum = _optimum[cur + offset];
+								if (curAndLenPrice < optimum.Price) 
+								{
+									optimum.Price = curAndLenPrice;
+									optimum.PosPrev = cur + lenTest + 1;
+									optimum.BackPrev = 0;
+									optimum.Prev1IsChar = true;
+									optimum.Prev2 = true;
+									optimum.PosPrev2 = cur;
+									optimum.BackPrev2 = repIndex;
+								}
+							}
+						}
+					}
+				}
+
+				if (newLen > numAvailableBytes)
+				{
+					newLen = numAvailableBytes;
+					for (numDistancePairs = 0; newLen > _matchDistances[numDistancePairs]; numDistancePairs += 2) ;
+					_matchDistances[numDistancePairs] = newLen;
+					numDistancePairs += 2;
+				}
+				if (newLen >= startLen)
+				{
+					normalMatchPrice = matchPrice + _isRep[state.Index].GetPrice0();
+					while (lenEnd < cur + newLen)
+						_optimum[++lenEnd].Price = kIfinityPrice;
+
+					UInt32 offs = 0;
+					while (startLen > _matchDistances[offs])
+						offs += 2;
+
+					for (UInt32 lenTest = startLen; ; lenTest++)
+					{
+						UInt32 curBack = _matchDistances[offs + 1];
+						UInt32 curAndLenPrice = normalMatchPrice + GetPosLenPrice(curBack, lenTest, posState);
+						Optimal optimum = _optimum[cur + lenTest];
+						if (curAndLenPrice < optimum.Price)
+						{
+							optimum.Price = curAndLenPrice;
+							optimum.PosPrev = cur;
+							optimum.BackPrev = curBack + Base.kNumRepDistances;
+							optimum.Prev1IsChar = false;
+						}
+
+						if (lenTest == _matchDistances[offs])
+						{
+							if (lenTest < numAvailableBytesFull)
+							{
+								UInt32 t = Math.Min(numAvailableBytesFull - 1 - lenTest, _numFastBytes);
+								UInt32 lenTest2 = _matchFinder.GetMatchLen((Int32)lenTest, curBack, t);
+								if (lenTest2 >= 2)
+								{
+									Base.State state2 = state;
+									state2.UpdateMatch();
+									UInt32 posStateNext = (position + lenTest) & _posStateMask;
+									UInt32 curAndLenCharPrice = curAndLenPrice +
+										_isMatch[(state2.Index << Base.kNumPosStatesBitsMax) + posStateNext].GetPrice0() +
+										_literalEncoder.GetSubCoder(position + lenTest,
+										_matchFinder.GetIndexByte((Int32)lenTest - 1 - 1)).
+										GetPrice(true,
+										_matchFinder.GetIndexByte((Int32)lenTest - (Int32)(curBack + 1) - 1),
+										_matchFinder.GetIndexByte((Int32)lenTest - 1));
+									state2.UpdateChar();
+									posStateNext = (position + lenTest + 1) & _posStateMask;
+									UInt32 nextMatchPrice = curAndLenCharPrice + _isMatch[(state2.Index << Base.kNumPosStatesBitsMax) + posStateNext].GetPrice1();
+									UInt32 nextRepMatchPrice = nextMatchPrice + _isRep[state2.Index].GetPrice1();
+
+									UInt32 offset = lenTest + 1 + lenTest2;
+									while (lenEnd < cur + offset)
+										_optimum[++lenEnd].Price = kIfinityPrice;
+									curAndLenPrice = nextRepMatchPrice + GetRepPrice(0, lenTest2, state2, posStateNext);
+									optimum = _optimum[cur + offset];
+									if (curAndLenPrice < optimum.Price)
+									{
+										optimum.Price = curAndLenPrice;
+										optimum.PosPrev = cur + lenTest + 1;
+										optimum.BackPrev = 0;
+										optimum.Prev1IsChar = true;
+										optimum.Prev2 = true;
+										optimum.PosPrev2 = cur;
+										optimum.BackPrev2 = curBack + Base.kNumRepDistances;
+									}
+								}
+							}
+							offs += 2;
+							if (offs == numDistancePairs)
+								break;
+						}
+					}
+				}
+			}
+		}
+
+		bool ChangePair(UInt32 smallDist, UInt32 bigDist)
+		{
+			const int kDif = 7;
+			return (smallDist < ((UInt32)(1) << (32 - kDif)) && bigDist >= (smallDist << kDif));
+		}
+
+		void WriteEndMarker(UInt32 posState)
+		{
+			if (!_writeEndMark)
+				return;
+
+			_isMatch[(_state.Index << Base.kNumPosStatesBitsMax) + posState].Encode(_rangeEncoder, 1);
+			_isRep[_state.Index].Encode(_rangeEncoder, 0);
+			_state.UpdateMatch();
+			UInt32 len = Base.kMatchMinLen;
+			_lenEncoder.Encode(_rangeEncoder, len - Base.kMatchMinLen, posState);
+			UInt32 posSlot = (1 << Base.kNumPosSlotBits) - 1;
+			UInt32 lenToPosState = Base.GetLenToPosState(len);
+			_posSlotEncoder[lenToPosState].Encode(_rangeEncoder, posSlot);
+			int footerBits = 30;
+			UInt32 posReduced = (((UInt32)1) << footerBits) - 1;
+			_rangeEncoder.EncodeDirectBits(posReduced >> Base.kNumAlignBits, footerBits - Base.kNumAlignBits);
+			_posAlignEncoder.ReverseEncode(_rangeEncoder, posReduced & Base.kAlignMask);
+		}
+
+		void Flush(UInt32 nowPos)
+		{
+			ReleaseMFStream();
+			WriteEndMarker(nowPos & _posStateMask);
+			_rangeEncoder.FlushData();
+			_rangeEncoder.FlushStream();
+		}
+
+		public void CodeOneBlock(out Int64 inSize, out Int64 outSize, out bool finished)
+		{
+			inSize = 0;
+			outSize = 0;
+			finished = true;
+
+			if (_inStream != null)
+			{
+				_matchFinder.SetStream(_inStream);
+				_matchFinder.Init();
+				_needReleaseMFStream = true;
+				_inStream = null;
+				if (_trainSize > 0)
+					_matchFinder.Skip(_trainSize);
+			}
+
+			if (_finished)
+				return;
+			_finished = true;
+
+
+			Int64 progressPosValuePrev = nowPos64;
+			if (nowPos64 == 0)
+			{
+				if (_matchFinder.GetNumAvailableBytes() == 0)
+				{
+					Flush((UInt32)nowPos64);
+					return;
+				}
+				UInt32 len, numDistancePairs; // it's not used
+				ReadMatchDistances(out len, out numDistancePairs);
+				UInt32 posState = (UInt32)(nowPos64) & _posStateMask;
+				_isMatch[(_state.Index << Base.kNumPosStatesBitsMax) + posState].Encode(_rangeEncoder, 0);
+				_state.UpdateChar();
+				Byte curByte = _matchFinder.GetIndexByte((Int32)(0 - _additionalOffset));
+				_literalEncoder.GetSubCoder((UInt32)(nowPos64), _previousByte).Encode(_rangeEncoder, curByte);
+				_previousByte = curByte;
+				_additionalOffset--;
+				nowPos64++;
+			}
+			if (_matchFinder.GetNumAvailableBytes() == 0)
+			{
+				Flush((UInt32)nowPos64);
+				return;
+			}
+			while (true)
+			{
+				UInt32 pos;
+				UInt32 len = GetOptimum((UInt32)nowPos64, out pos);
+				
+				UInt32 posState = ((UInt32)nowPos64) & _posStateMask;
+				UInt32 complexState = (_state.Index << Base.kNumPosStatesBitsMax) + posState;
+				if (len == 1 && pos == 0xFFFFFFFF)
+				{
+					_isMatch[complexState].Encode(_rangeEncoder, 0);
+					Byte curByte = _matchFinder.GetIndexByte((Int32)(0 - _additionalOffset));
+					LiteralEncoder.Encoder2 subCoder = _literalEncoder.GetSubCoder((UInt32)nowPos64, _previousByte);
+					if (!_state.IsCharState())
+					{
+						Byte matchByte = _matchFinder.GetIndexByte((Int32)(0 - _repDistances[0] - 1 - _additionalOffset));
+						subCoder.EncodeMatched(_rangeEncoder, matchByte, curByte);
+					}
+					else
+						subCoder.Encode(_rangeEncoder, curByte);
+					_previousByte = curByte;
+					_state.UpdateChar();
+				}
+				else
+				{
+					_isMatch[complexState].Encode(_rangeEncoder, 1);
+					if (pos < Base.kNumRepDistances)
+					{
+						_isRep[_state.Index].Encode(_rangeEncoder, 1);
+						if (pos == 0)
+						{
+							_isRepG0[_state.Index].Encode(_rangeEncoder, 0);
+							if (len == 1)
+								_isRep0Long[complexState].Encode(_rangeEncoder, 0);
+							else
+								_isRep0Long[complexState].Encode(_rangeEncoder, 1);
+						}
+						else
+						{
+							_isRepG0[_state.Index].Encode(_rangeEncoder, 1);
+							if (pos == 1)
+								_isRepG1[_state.Index].Encode(_rangeEncoder, 0);
+							else
+							{
+								_isRepG1[_state.Index].Encode(_rangeEncoder, 1);
+								_isRepG2[_state.Index].Encode(_rangeEncoder, pos - 2);
+							}
+						}
+						if (len == 1)
+							_state.UpdateShortRep();
+						else
+						{
+							_repMatchLenEncoder.Encode(_rangeEncoder, len - Base.kMatchMinLen, posState);
+							_state.UpdateRep();
+						}
+						UInt32 distance = _repDistances[pos];
+						if (pos != 0)
+						{
+							for (UInt32 i = pos; i >= 1; i--)
+								_repDistances[i] = _repDistances[i - 1];
+							_repDistances[0] = distance;
+						}
+					}
+					else
+					{
+						_isRep[_state.Index].Encode(_rangeEncoder, 0);
+						_state.UpdateMatch();
+						_lenEncoder.Encode(_rangeEncoder, len - Base.kMatchMinLen, posState);
+						pos -= Base.kNumRepDistances;
+						UInt32 posSlot = GetPosSlot(pos);
+						UInt32 lenToPosState = Base.GetLenToPosState(len);
+						_posSlotEncoder[lenToPosState].Encode(_rangeEncoder, posSlot);
+
+						if (posSlot >= Base.kStartPosModelIndex)
+						{
+							int footerBits = (int)((posSlot >> 1) - 1);
+							UInt32 baseVal = ((2 | (posSlot & 1)) << footerBits);
+							UInt32 posReduced = pos - baseVal;
+
+							if (posSlot < Base.kEndPosModelIndex)
+								RangeCoder.BitTreeEncoder.ReverseEncode(_posEncoders,
+										baseVal - posSlot - 1, _rangeEncoder, footerBits, posReduced);
+							else
+							{
+								_rangeEncoder.EncodeDirectBits(posReduced >> Base.kNumAlignBits, footerBits - Base.kNumAlignBits);
+								_posAlignEncoder.ReverseEncode(_rangeEncoder, posReduced & Base.kAlignMask);
+								_alignPriceCount++;
+							}
+						}
+						UInt32 distance = pos;
+						for (UInt32 i = Base.kNumRepDistances - 1; i >= 1; i--)
+							_repDistances[i] = _repDistances[i - 1];
+						_repDistances[0] = distance;
+						_matchPriceCount++;
+					}
+					_previousByte = _matchFinder.GetIndexByte((Int32)(len - 1 - _additionalOffset));
+				}
+				_additionalOffset -= len;
+				nowPos64 += len;
+				if (_additionalOffset == 0)
+				{
+					// if (!_fastMode)
+					if (_matchPriceCount >= (1 << 7))
+						FillDistancesPrices();
+					if (_alignPriceCount >= Base.kAlignTableSize)
+						FillAlignPrices();
+					inSize = nowPos64;
+					outSize = _rangeEncoder.GetProcessedSizeAdd();
+					if (_matchFinder.GetNumAvailableBytes() == 0)
+					{
+						Flush((UInt32)nowPos64);
+						return;
+					}
+
+					if (nowPos64 - progressPosValuePrev >= (1 << 12))
+					{
+						_finished = false;
+						finished = false;
+						return;
+					}
+				}
+			}
+		}
+
+		void ReleaseMFStream()
+		{
+			if (_matchFinder != null && _needReleaseMFStream)
+			{
+				_matchFinder.ReleaseStream();
+				_needReleaseMFStream = false;
+			}
+		}
+
+		void SetOutStream(System.IO.Stream outStream) { _rangeEncoder.SetStream(outStream); }
+		void ReleaseOutStream() { _rangeEncoder.ReleaseStream(); }
+
+		void ReleaseStreams()
+		{
+			ReleaseMFStream();
+			ReleaseOutStream();
+		}
+
+		void SetStreams(System.IO.Stream inStream, System.IO.Stream outStream,
+				Int64 inSize, Int64 outSize)
+		{
+			_inStream = inStream;
+			_finished = false;
+			Create();
+			SetOutStream(outStream);
+			Init();
+
+			// if (!_fastMode)
+			{
+				FillDistancesPrices();
+				FillAlignPrices();
+			}
+
+			_lenEncoder.SetTableSize(_numFastBytes + 1 - Base.kMatchMinLen);
+			_lenEncoder.UpdateTables((UInt32)1 << _posStateBits);
+			_repMatchLenEncoder.SetTableSize(_numFastBytes + 1 - Base.kMatchMinLen);
+			_repMatchLenEncoder.UpdateTables((UInt32)1 << _posStateBits);
+
+			nowPos64 = 0;
+		}
+
+
+		public void Code(System.IO.Stream inStream, System.IO.Stream outStream,
+			Int64 inSize, Int64 outSize, ICodeProgress progress)
+		{
+			_needReleaseMFStream = false;
+			try
+			{
+				SetStreams(inStream, outStream, inSize, outSize);
+				while (true)
+				{
+					Int64 processedInSize;
+					Int64 processedOutSize;
+					bool finished;
+					CodeOneBlock(out processedInSize, out processedOutSize, out finished);
+					if (finished)
+						return;
+					if (progress != null)
+					{
+						progress.SetProgress(processedInSize, processedOutSize);
+					}
+				}
+			}
+			finally
+			{
+				ReleaseStreams();
+			}
+		}
+
+		const int kPropSize = 5;
+		Byte[] properties = new Byte[kPropSize];
+
+		public void WriteCoderProperties(System.IO.Stream outStream)
+		{
+			properties[0] = (Byte)((_posStateBits * 5 + _numLiteralPosStateBits) * 9 + _numLiteralContextBits);
+			for (int i = 0; i < 4; i++)
+				properties[1 + i] = (Byte)(_dictionarySize >> (8 * i));
+			outStream.Write(properties, 0, kPropSize);
+		}
+		
+		UInt32[] tempPrices = new UInt32[Base.kNumFullDistances];
+		UInt32 _matchPriceCount;
+
+		void FillDistancesPrices()
+		{
+			for (UInt32 i = Base.kStartPosModelIndex; i < Base.kNumFullDistances; i++)
+			{ 
+				UInt32 posSlot = GetPosSlot(i);
+				int footerBits = (int)((posSlot >> 1) - 1);
+				UInt32 baseVal = ((2 | (posSlot & 1)) << footerBits);
+				tempPrices[i] = BitTreeEncoder.ReverseGetPrice(_posEncoders, 
+					baseVal - posSlot - 1, footerBits, i - baseVal);
+			}
+
+			for (UInt32 lenToPosState = 0; lenToPosState < Base.kNumLenToPosStates; lenToPosState++)
+			{
+				UInt32 posSlot;
+				RangeCoder.BitTreeEncoder encoder = _posSlotEncoder[lenToPosState];
+			
+				UInt32 st = (lenToPosState << Base.kNumPosSlotBits);
+				for (posSlot = 0; posSlot < _distTableSize; posSlot++)
+					_posSlotPrices[st + posSlot] = encoder.GetPrice(posSlot);
+				for (posSlot = Base.kEndPosModelIndex; posSlot < _distTableSize; posSlot++)
+					_posSlotPrices[st + posSlot] += ((((posSlot >> 1) - 1) - Base.kNumAlignBits) << RangeCoder.BitEncoder.kNumBitPriceShiftBits);
+
+				UInt32 st2 = lenToPosState * Base.kNumFullDistances;
+				UInt32 i;
+				for (i = 0; i < Base.kStartPosModelIndex; i++)
+					_distancesPrices[st2 + i] = _posSlotPrices[st + i];
+				for (; i < Base.kNumFullDistances; i++)
+					_distancesPrices[st2 + i] = _posSlotPrices[st + GetPosSlot(i)] + tempPrices[i];
+			}
+			_matchPriceCount = 0;
+		}
+
+		void FillAlignPrices()
+		{
+			for (UInt32 i = 0; i < Base.kAlignTableSize; i++)
+				_alignPrices[i] = _posAlignEncoder.ReverseGetPrice(i);
+			_alignPriceCount = 0;
+		}
+
+
+		static string[] kMatchFinderIDs = 
+		{
+			"BT2",
+			"BT4",
+		};
+
+		static int FindMatchFinder(string s)
+		{
+			for (int m = 0; m < kMatchFinderIDs.Length; m++)
+				if (s == kMatchFinderIDs[m])
+					return m;
+			return -1;
+		}
+	
+		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 InvalidParamException();
+						Int32 numFastBytes = (Int32)prop;
+						if (numFastBytes < 5 || numFastBytes > Base.kMatchMaxLen)
+							throw new InvalidParamException();
+						_numFastBytes = (UInt32)numFastBytes;
+						break;
+					}
+					case CoderPropID.Algorithm:
+					{
+						/*
+						if (!(prop is Int32))
+							throw new InvalidParamException();
+						Int32 maximize = (Int32)prop;
+						_fastMode = (maximize == 0);
+						_maxMode = (maximize >= 2);
+						*/
+						break;
+					}
+					case CoderPropID.MatchFinder:
+					{
+						if (!(prop is String))
+							throw new InvalidParamException();
+						EMatchFinderType matchFinderIndexPrev = _matchFinderType;
+						int m = FindMatchFinder(((string)prop).ToUpper());
+						if (m < 0)
+							throw new InvalidParamException();
+						_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 InvalidParamException(); ;
+						Int32 dictionarySize = (Int32)prop;
+						if (dictionarySize < (UInt32)(1 << Base.kDicLogSizeMin) ||
+							dictionarySize > (UInt32)(1 << kDicLogSizeMaxCompress))
+							throw new InvalidParamException();
+						_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 InvalidParamException();
+						Int32 v = (Int32)prop;
+						if (v < 0 || v > (UInt32)Base.kNumPosStatesBitsEncodingMax)
+							throw new InvalidParamException();
+						_posStateBits = (int)v;
+						_posStateMask = (((UInt32)1) << (int)_posStateBits) - 1;
+						break;
+					}
+					case CoderPropID.LitPosBits:
+					{
+						if (!(prop is Int32))
+							throw new InvalidParamException();
+						Int32 v = (Int32)prop;
+						if (v < 0 || v > (UInt32)Base.kNumLitPosStatesBitsEncodingMax)
+							throw new InvalidParamException();
+						_numLiteralPosStateBits = (int)v;
+						break;
+					}
+					case CoderPropID.LitContextBits:
+					{
+						if (!(prop is Int32))
+							throw new InvalidParamException();
+						Int32 v = (Int32)prop;
+						if (v < 0 || v > (UInt32)Base.kNumLitContextBitsMax)
+							throw new InvalidParamException(); ;
+						_numLiteralContextBits = (int)v;
+						break;
+					}
+					case CoderPropID.EndMarker:
+					{
+						if (!(prop is Boolean))
+							throw new InvalidParamException();
+						SetWriteEndMarkerMode((Boolean)prop);
+						break;
+					}
+					default:
+						throw new InvalidParamException();
+				}
+			}
+		}
+
+		uint _trainSize = 0;
+		public void SetTrainSize(uint trainSize)
+		{
+			_trainSize = trainSize;
+		}
+		
+	}
+}