339 lines
8.4 KiB
C++
339 lines
8.4 KiB
C++
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// LZMADecoder.cpp
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#include "StdAfx.h"
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#include "LZMADecoder.h"
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#include "../../../Common/Defs.h"
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namespace NCompress {
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namespace NLZMA {
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const int kLenIdFinished = -1;
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const int kLenIdNeedInit = -2;
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void CDecoder::Init()
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{
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{
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for(int i = 0; i < kNumStates; i++)
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{
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for (UInt32 j = 0; j <= _posStateMask; j++)
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{
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_isMatch[i][j].Init();
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_isRep0Long[i][j].Init();
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}
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_isRep[i].Init();
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_isRepG0[i].Init();
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_isRepG1[i].Init();
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_isRepG2[i].Init();
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}
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}
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{
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for (UInt32 i = 0; i < kNumLenToPosStates; i++)
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_posSlotDecoder[i].Init();
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}
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{
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for(UInt32 i = 0; i < kNumFullDistances - kEndPosModelIndex; i++)
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_posDecoders[i].Init();
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}
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_posAlignDecoder.Init();
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_lenDecoder.Init(_posStateMask + 1);
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_repMatchLenDecoder.Init(_posStateMask + 1);
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_literalDecoder.Init();
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_state.Init();
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_reps[0] = _reps[1] = _reps[2] = _reps[3] = 0;
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}
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HRESULT CDecoder::CodeSpec(UInt32 curSize)
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{
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if (_outSizeDefined)
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{
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const UInt64 rem = _outSize - _outWindowStream.GetProcessedSize();
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if (curSize > rem)
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curSize = (UInt32)rem;
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}
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if (_remainLen == kLenIdFinished)
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return S_OK;
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if (_remainLen == kLenIdNeedInit)
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{
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_rangeDecoder.Init();
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Init();
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_remainLen = 0;
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}
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if (curSize == 0)
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return S_OK;
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UInt32 rep0 = _reps[0];
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UInt32 rep1 = _reps[1];
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UInt32 rep2 = _reps[2];
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UInt32 rep3 = _reps[3];
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CState state = _state;
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Byte previousByte;
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while(_remainLen > 0 && curSize > 0)
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{
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previousByte = _outWindowStream.GetByte(rep0);
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_outWindowStream.PutByte(previousByte);
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_remainLen--;
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curSize--;
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}
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UInt64 nowPos64 = _outWindowStream.GetProcessedSize();
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if (nowPos64 == 0)
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previousByte = 0;
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else
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previousByte = _outWindowStream.GetByte(0);
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while(curSize > 0)
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{
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{
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#ifdef _NO_EXCEPTIONS
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if (_rangeDecoder.Stream.ErrorCode != S_OK)
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return _rangeDecoder.Stream.ErrorCode;
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#endif
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if (_rangeDecoder.Stream.WasFinished())
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return S_FALSE;
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UInt32 posState = UInt32(nowPos64) & _posStateMask;
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if (_isMatch[state.Index][posState].Decode(&_rangeDecoder) == 0)
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{
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if(!state.IsCharState())
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previousByte = _literalDecoder.DecodeWithMatchByte(&_rangeDecoder,
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(UInt32)nowPos64, previousByte, _outWindowStream.GetByte(rep0));
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else
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previousByte = _literalDecoder.DecodeNormal(&_rangeDecoder,
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(UInt32)nowPos64, previousByte);
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_outWindowStream.PutByte(previousByte);
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state.UpdateChar();
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curSize--;
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nowPos64++;
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}
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else
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{
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UInt32 len;
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if(_isRep[state.Index].Decode(&_rangeDecoder) == 1)
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{
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len = 0;
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if(_isRepG0[state.Index].Decode(&_rangeDecoder) == 0)
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{
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if(_isRep0Long[state.Index][posState].Decode(&_rangeDecoder) == 0)
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{
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state.UpdateShortRep();
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len = 1;
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}
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}
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else
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{
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UInt32 distance;
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if(_isRepG1[state.Index].Decode(&_rangeDecoder) == 0)
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distance = rep1;
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else
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{
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if (_isRepG2[state.Index].Decode(&_rangeDecoder) == 0)
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distance = rep2;
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else
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{
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distance = rep3;
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rep3 = rep2;
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}
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rep2 = rep1;
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}
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rep1 = rep0;
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rep0 = distance;
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}
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if (len == 0)
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{
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len = _repMatchLenDecoder.Decode(&_rangeDecoder, posState) + kMatchMinLen;
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state.UpdateRep();
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}
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}
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else
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{
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rep3 = rep2;
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rep2 = rep1;
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rep1 = rep0;
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len = kMatchMinLen + _lenDecoder.Decode(&_rangeDecoder, posState);
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state.UpdateMatch();
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UInt32 posSlot = _posSlotDecoder[GetLenToPosState(len)].Decode(&_rangeDecoder);
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if (posSlot >= kStartPosModelIndex)
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{
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UInt32 numDirectBits = (posSlot >> 1) - 1;
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rep0 = ((2 | (posSlot & 1)) << numDirectBits);
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if (posSlot < kEndPosModelIndex)
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rep0 += NRangeCoder::ReverseBitTreeDecode(_posDecoders +
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rep0 - posSlot - 1, &_rangeDecoder, numDirectBits);
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else
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{
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rep0 += (_rangeDecoder.DecodeDirectBits(
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numDirectBits - kNumAlignBits) << kNumAlignBits);
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rep0 += _posAlignDecoder.ReverseDecode(&_rangeDecoder);
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if (rep0 == 0xFFFFFFFF)
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{
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_remainLen = kLenIdFinished;
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return S_OK;
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}
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}
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}
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else
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rep0 = posSlot;
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}
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UInt32 locLen = len;
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if (len > curSize)
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locLen = (UInt32)curSize;
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if (!_outWindowStream.CopyBlock(rep0, locLen))
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return S_FALSE;
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previousByte = _outWindowStream.GetByte(0);
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curSize -= locLen;
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nowPos64 += locLen;
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len -= locLen;
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if (len != 0)
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{
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_remainLen = (Int32)len;
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break;
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}
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#ifdef _NO_EXCEPTIONS
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if (_outWindowStream.ErrorCode != S_OK)
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return _outWindowStream.ErrorCode;
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#endif
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}
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}
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}
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if (_rangeDecoder.Stream.WasFinished())
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return S_FALSE;
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_reps[0] = rep0;
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_reps[1] = rep1;
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_reps[2] = rep2;
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_reps[3] = rep3;
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_state = state;
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return S_OK;
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}
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STDMETHODIMP CDecoder::CodeReal(ISequentialInStream *inStream,
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ISequentialOutStream *outStream,
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const UInt64 *, const UInt64 *outSize,
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ICompressProgressInfo *progress)
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{
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SetInStream(inStream);
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_outWindowStream.SetStream(outStream);
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SetOutStreamSize(outSize);
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CDecoderFlusher flusher(this);
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for (;;)
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{
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UInt32 curSize = 1 << 18;
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RINOK(CodeSpec(curSize));
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if (_remainLen == kLenIdFinished)
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break;
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if (progress != NULL)
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{
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UInt64 inSize = _rangeDecoder.GetProcessedSize();
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UInt64 nowPos64 = _outWindowStream.GetProcessedSize();
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RINOK(progress->SetRatioInfo(&inSize, &nowPos64));
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}
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if (_outSizeDefined)
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if (_outWindowStream.GetProcessedSize() >= _outSize)
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break;
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}
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flusher.NeedFlush = false;
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return Flush();
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}
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#ifdef _NO_EXCEPTIONS
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#define LZMA_TRY_BEGIN
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#define LZMA_TRY_END
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#else
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#define LZMA_TRY_BEGIN try {
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#define LZMA_TRY_END } \
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catch(const CInBufferException &e) { return e.ErrorCode; } \
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catch(const CLZOutWindowException &e) { return e.ErrorCode; } \
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catch(...) { return S_FALSE; }
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#endif
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STDMETHODIMP CDecoder::Code(ISequentialInStream *inStream,
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ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
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ICompressProgressInfo *progress)
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{
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LZMA_TRY_BEGIN
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return CodeReal(inStream, outStream, inSize, outSize, progress);
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LZMA_TRY_END
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}
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STDMETHODIMP CDecoder::SetDecoderProperties2(const Byte *properties, UInt32 size)
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{
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if (size < 5)
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return E_INVALIDARG;
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int lc = properties[0] % 9;
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Byte remainder = (Byte)(properties[0] / 9);
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int lp = remainder % 5;
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int pb = remainder / 5;
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if (pb > NLength::kNumPosStatesBitsMax)
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return E_INVALIDARG;
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_posStateMask = (1 << pb) - 1;
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UInt32 dictionarySize = 0;
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for (int i = 0; i < 4; i++)
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dictionarySize += ((UInt32)(properties[1 + i])) << (i * 8);
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if (!_outWindowStream.Create(dictionarySize))
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return E_OUTOFMEMORY;
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if (!_literalDecoder.Create(lp, lc))
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return E_OUTOFMEMORY;
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if (!_rangeDecoder.Create(1 << 20))
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return E_OUTOFMEMORY;
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return S_OK;
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}
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STDMETHODIMP CDecoder::GetInStreamProcessedSize(UInt64 *value)
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{
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*value = _rangeDecoder.GetProcessedSize();
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return S_OK;
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}
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STDMETHODIMP CDecoder::SetInStream(ISequentialInStream *inStream)
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{
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_rangeDecoder.SetStream(inStream);
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return S_OK;
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}
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STDMETHODIMP CDecoder::ReleaseInStream()
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{
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_rangeDecoder.ReleaseStream();
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return S_OK;
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}
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STDMETHODIMP CDecoder::SetOutStreamSize(const UInt64 *outSize)
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{
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_outSizeDefined = (outSize != NULL);
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if (_outSizeDefined)
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_outSize = *outSize;
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_remainLen = kLenIdNeedInit;
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_outWindowStream.Init();
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return S_OK;
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}
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#ifndef NO_READ_FROM_CODER
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STDMETHODIMP CDecoder::Read(void *data, UInt32 size, UInt32 *processedSize)
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{
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LZMA_TRY_BEGIN
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if (processedSize)
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*processedSize = 0;
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const UInt64 startPos = _outWindowStream.GetProcessedSize();
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_outWindowStream.SetMemStream((Byte *)data);
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RINOK(CodeSpec(size));
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if (processedSize)
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*processedSize = (UInt32)(_outWindowStream.GetProcessedSize() - startPos);
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return Flush();
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LZMA_TRY_END
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}
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#endif
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}}
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