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