public LzmaDecoder()
{
m_DictionarySize = 0xFFFFFFFF;
for (int i = 0; i < LzmaBase.kNumLenToPosStates; i++)
{
m_PosSlotDecoder[i] = new RangeBitTreeDecoder(LzmaBase.kNumPosSlotBits);
}
}
public void Create(uint numPosStates)
{
for (uint posState = m_NumPosStates; posState < numPosStates; posState++)
{
m_LowCoder[posState] = new RangeBitTreeDecoder(LzmaBase.kNumLowLenBits);
m_MidCoder[posState] = new RangeBitTreeDecoder(LzmaBase.kNumMidLenBits);
}
m_NumPosStates = numPosStates;
}
internal void Create(uint PositionStatesCount)
{
for (uint PositionState = this.PositionStatesCount; PositionState < PositionStatesCount; PositionState++)
{
LowDecoder[PositionState] = new RangeBitTreeDecoder(3);
MidDecoder[PositionState] = new RangeBitTreeDecoder(3);
}
this.PositionStatesCount = PositionStatesCount;
}
public override void Code(System.IO.Stream inStream, System.IO.Stream outStream,
Int64 inSize, Int64 outSize, ICodingProgress progress)
{
if (outSize < 0)
{
throw new ArgumentOutOfRangeException(nameof(outSize), "outSize must be grater than 0. outSize is the uncompressed size of inStream.");
}
Init(inStream, outStream);
LzmaBase.State state = new LzmaBase.State();
state.Init();
uint rep0 = 0, rep1 = 0, rep2 = 0, rep3 = 0;
UInt64 nowPos64 = 0;
UInt64 outSize64 = (UInt64)outSize;
if (nowPos64 < outSize64)
{
if (m_IsMatchDecoders[state.Index << LzmaBase.kNumPosStatesBitsMax].Decode(m_RangeDecoder) != 0)
{
throw new DataErrorException();
}
state.UpdateChar();
byte b = m_LiteralDecoder.DecodeNormal(m_RangeDecoder, 0, 0);
m_OutWindow.PutByte(b);
nowPos64++;
}
while (nowPos64 < outSize64)
{
// UInt64 next = Math.Min(nowPos64 + (1 << 18), outSize64);
// while(nowPos64 < next)
{
uint posState = (uint)nowPos64 & m_PosStateMask;
if (m_IsMatchDecoders[(state.Index << LzmaBase.kNumPosStatesBitsMax) + posState].Decode(m_RangeDecoder) == 0)
{
byte b;
byte prevByte = m_OutWindow.GetByte(0);
if (!state.IsCharState())
{
b = m_LiteralDecoder.DecodeWithMatchByte(m_RangeDecoder,
(uint)nowPos64, prevByte, m_OutWindow.GetByte(rep0));
}
else
{
b = m_LiteralDecoder.DecodeNormal(m_RangeDecoder, (uint)nowPos64, prevByte);
}
m_OutWindow.PutByte(b);
state.UpdateChar();
nowPos64++;
}
else
{
uint len;
if (m_IsRepDecoders[state.Index].Decode(m_RangeDecoder) == 1)
{
if (m_IsRepG0Decoders[state.Index].Decode(m_RangeDecoder) == 0)
{
if (m_IsRep0LongDecoders[(state.Index << LzmaBase.kNumPosStatesBitsMax) + posState].Decode(m_RangeDecoder) == 0)
{
state.UpdateShortRep();
m_OutWindow.PutByte(m_OutWindow.GetByte(rep0));
nowPos64++;
continue;
}
}
else
{
UInt32 distance;
if (m_IsRepG1Decoders[state.Index].Decode(m_RangeDecoder) == 0)
{
distance = rep1;
}
else
{
if (m_IsRepG2Decoders[state.Index].Decode(m_RangeDecoder) == 0)
{
distance = rep2;
}
else
{
distance = rep3;
rep3 = rep2;
}
rep2 = rep1;
}
rep1 = rep0;
rep0 = distance;
}
len = m_RepLenDecoder.Decode(m_RangeDecoder, posState) + LzmaBase.kMatchMinLen;
state.UpdateRep();
}
else
{
rep3 = rep2;
rep2 = rep1;
rep1 = rep0;
len = LzmaBase.kMatchMinLen + m_LenDecoder.Decode(m_RangeDecoder, posState);
state.UpdateMatch();
uint posSlot = m_PosSlotDecoder[LzmaBase.GetLenToPosState(len)].Decode(m_RangeDecoder);
if (posSlot >= LzmaBase.kStartPosModelIndex)
{
int numDirectBits = (int)((posSlot >> 1) - 1);
rep0 = ((2 | (posSlot & 1)) << numDirectBits);
if (posSlot < LzmaBase.kEndPosModelIndex)
{
rep0 += RangeBitTreeDecoder.ReverseDecode(m_PosDecoders,
rep0 - posSlot - 1, m_RangeDecoder, numDirectBits);
}
else
{
rep0 += (m_RangeDecoder.DecodeDirectBits(
numDirectBits - LzmaBase.kNumAlignBits) << LzmaBase.kNumAlignBits);
rep0 += m_PosAlignDecoder.ReverseDecode(m_RangeDecoder);
}
}
else
{
rep0 = posSlot;
}
}
if (rep0 >= m_OutWindow.TrainSize + nowPos64 || rep0 >= m_DictionarySizeCheck)
{
if (rep0 == 0xFFFFFFFF)
{
break;
}
throw new DataErrorException();
}
m_OutWindow.CopyBlock(rep0, len);
nowPos64 += len;
}
}
}
m_OutWindow.Flush();
m_OutWindow.ReleaseStream();
m_RangeDecoder.ReleaseStream();
}
