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// QuantumDecoder.cpp
#include "StdAfx.h"
#include "../../Common/Defs.h"
#include "QuantumDecoder.h"
namespace NCompress {
namespace NQuantum {
static const int kLenIdNeedInit = -2;
static const unsigned kNumLenSymbols = 27;
static const unsigned kMatchMinLen = 3;
static const unsigned kNumSimplePosSlots = 4;
static const unsigned kNumSimpleLenSlots = 6;
void CDecoder::Init()
{
m_Selector.Init(kNumSelectors);
unsigned i;
for (i = 0; i < kNumLitSelectors; i++)
m_Literals[i].Init(kNumLitSymbols);
unsigned numItems = (_numDictBits == 0 ? 1 : (_numDictBits << 1));
const unsigned kNumPosSymbolsMax[kNumMatchSelectors] = { 24, 36, 42 };
for (i = 0; i < kNumMatchSelectors; i++)
m_PosSlot[i].Init(MyMin(numItems, kNumPosSymbolsMax[i]));
m_LenSlot.Init(kNumLenSymbols);
}
HRESULT CDecoder::CodeSpec(UInt32 curSize)
{
if (_remainLen == kLenIdNeedInit)
{
if (!_keepHistory)
{
if (!_outWindowStream.Create((UInt32)1 << _numDictBits))
return E_OUTOFMEMORY;
Init();
}
if (!_rangeDecoder.Create(1 << 20))
return E_OUTOFMEMORY;
_rangeDecoder.Init();
_remainLen = 0;
}
if (curSize == 0)
return S_OK;
while (_remainLen > 0 && curSize > 0)
{
_remainLen--;
Byte b = _outWindowStream.GetByte(_rep0);
_outWindowStream.PutByte(b);
curSize--;
}
while (curSize > 0)
{
if (_rangeDecoder.Stream.WasFinished())
return S_FALSE;
unsigned selector = m_Selector.Decode(&_rangeDecoder);
if (selector < kNumLitSelectors)
{
Byte b = (Byte)((selector << (8 - kNumLitSelectorBits)) + m_Literals[selector].Decode(&_rangeDecoder));
_outWindowStream.PutByte(b);
curSize--;
}
else
{
selector -= kNumLitSelectors;
unsigned len = selector + kMatchMinLen;
if (selector == 2)
{
unsigned lenSlot = m_LenSlot.Decode(&_rangeDecoder);
if (lenSlot >= kNumSimpleLenSlots)
{
lenSlot -= 2;
int numDirectBits = (int)(lenSlot >> 2);
len += ((4 | (lenSlot & 3)) << numDirectBits) - 2;
if (numDirectBits < 6)
len += _rangeDecoder.Stream.ReadBits(numDirectBits);
}
else
len += lenSlot;
}
UInt32 rep0 = m_PosSlot[selector].Decode(&_rangeDecoder);
if (rep0 >= kNumSimplePosSlots)
{
int numDirectBits = (int)((rep0 >> 1) - 1);
rep0 = ((2 | (rep0 & 1)) << numDirectBits) + _rangeDecoder.Stream.ReadBits(numDirectBits);
}
unsigned locLen = len;
if (len > curSize)
locLen = (unsigned)curSize;
if (!_outWindowStream.CopyBlock(rep0, locLen))
return S_FALSE;
curSize -= locLen;
len -= locLen;
if (len != 0)
{
_remainLen = (int)len;
_rep0 = rep0;
break;
}
}
}
return _rangeDecoder.Stream.WasFinished() ? S_FALSE : S_OK;
}
HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 *, const UInt64 *outSize, ICompressProgressInfo *progress)
{
if (outSize == NULL)
return E_INVALIDARG;
UInt64 size = *outSize;
SetInStream(inStream);
_outWindowStream.SetStream(outStream);
SetOutStreamSize(outSize);
CDecoderFlusher flusher(this);
const UInt64 start = _outWindowStream.GetProcessedSize();
for (;;)
{
UInt32 curSize = 1 << 18;
UInt64 rem = size - (_outWindowStream.GetProcessedSize() - start);
if (curSize > rem)
curSize = (UInt32)rem;
if (curSize == 0)
break;
RINOK(CodeSpec(curSize));
if (progress != NULL)
{
UInt64 inSize = _rangeDecoder.GetProcessedSize();
UInt64 nowPos64 = _outWindowStream.GetProcessedSize() - start;
RINOK(progress->SetRatioInfo(&inSize, &nowPos64));
}
}
flusher.NeedFlush = false;
return Flush();
}
STDMETHODIMP CDecoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress)
{
try { return CodeReal(inStream, outStream, inSize, outSize, progress); }
catch(const CInBufferException &e) { return e.ErrorCode; }
catch(const CLzOutWindowException &e) { return e.ErrorCode; }
catch(...) { return S_FALSE; }
}
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)
{
if (outSize == NULL)
return E_FAIL;
_remainLen = kLenIdNeedInit;
_outWindowStream.Init(_keepHistory);
return S_OK;
}
}}
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