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// LzhDecoder.cpp
#include "StdAfx.h"
#include "LzhDecoder.h"
#include "Windows/Defs.h"
namespace NCompress{
namespace NLzh {
namespace NDecoder {
static const UInt32 kHistorySize = (1 << 16);
static const int kBlockSizeBits = 16;
static const int kNumCBits = 9;
static const int kNumLevelBits = 5; // smallest integer such that (1 << kNumLevelBits) > kNumLevelSymbols/
UInt32 CCoder::ReadBits(int numBits) { return m_InBitStream.ReadBits(numBits); }
HRESULT CCoder::ReadLevelTable()
{
int n = ReadBits(kNumLevelBits);
if (n == 0)
{
m_LevelHuffman.Symbol = ReadBits(kNumLevelBits);
if (m_LevelHuffman.Symbol >= kNumLevelSymbols)
return S_FALSE;
}
else
{
if (n > kNumLevelSymbols)
return S_FALSE;
m_LevelHuffman.Symbol = -1;
Byte lens[kNumLevelSymbols];
int i = 0;
while (i < n)
{
int c = m_InBitStream.ReadBits(3);
if (c == 7)
while (ReadBits(1))
if (c++ > kMaxHuffmanLen)
return S_FALSE;
lens[i++] = (Byte)c;
if (i == kNumSpecLevelSymbols)
{
c = ReadBits(2);
while (--c >= 0)
lens[i++] = 0;
}
}
while (i < kNumLevelSymbols)
lens[i++] = 0;
m_LevelHuffman.SetCodeLengths(lens);
}
return S_OK;
}
HRESULT CCoder::ReadPTable(int numBits)
{
int n = ReadBits(numBits);
if (n == 0)
{
m_PHuffmanDecoder.Symbol = ReadBits(numBits);
if (m_PHuffmanDecoder.Symbol >= kNumDistanceSymbols)
return S_FALSE;
}
else
{
if (n > kNumDistanceSymbols)
return S_FALSE;
m_PHuffmanDecoder.Symbol = -1;
Byte lens[kNumDistanceSymbols];
int i = 0;
while (i < n)
{
int c = m_InBitStream.ReadBits(3);
if (c == 7)
while (ReadBits(1))
{
if (c > kMaxHuffmanLen)
return S_FALSE;
c++;
}
lens[i++] = (Byte)c;
}
while (i < kNumDistanceSymbols)
lens[i++] = 0;
m_PHuffmanDecoder.SetCodeLengths(lens);
}
return S_OK;
}
HRESULT CCoder::ReadCTable()
{
int n = ReadBits(kNumCBits);
if (n == 0)
{
m_CHuffmanDecoder.Symbol = ReadBits(kNumCBits);
if (m_CHuffmanDecoder.Symbol >= kNumCSymbols)
return S_FALSE;
}
else
{
if (n > kNumCSymbols)
return S_FALSE;
m_CHuffmanDecoder.Symbol = -1;
Byte lens[kNumCSymbols];
int i = 0;
while (i < n)
{
int c = m_LevelHuffman.Decode(&m_InBitStream);
if (c < kNumSpecLevelSymbols)
{
if (c == 0)
c = 1;
else if (c == 1)
c = ReadBits(4) + 3;
else
c = ReadBits(kNumCBits) + 20;
while (--c >= 0)
{
if (i > kNumCSymbols)
return S_FALSE;
lens[i++] = 0;
}
}
else
lens[i++] = (Byte)(c - 2);
}
while (i < kNumCSymbols)
lens[i++] = 0;
m_CHuffmanDecoder.SetCodeLengths(lens);
}
return S_OK;
}
STDMETHODIMP CCoder::CodeReal(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 * /* inSize */, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
if (outSize == NULL)
return E_INVALIDARG;
if (!m_OutWindowStream.Create(kHistorySize))
return E_OUTOFMEMORY;
if (!m_InBitStream.Create(1 << 20))
return E_OUTOFMEMORY;
UInt64 pos = 0;
m_OutWindowStream.SetStream(outStream);
m_OutWindowStream.Init(false);
m_InBitStream.SetStream(inStream);
m_InBitStream.Init();
CCoderReleaser coderReleaser(this);
int pbit;
if (m_NumDictBits <= 13)
pbit = 4;
else
pbit = 5;
UInt32 blockSize = 0;
while(pos < *outSize)
{
// for (i = 0; i < dictSize; i++) dtext[i] = 0x20;
if (blockSize == 0)
{
if (progress != NULL)
{
UInt64 packSize = m_InBitStream.GetProcessedSize();
RINOK(progress->SetRatioInfo(&packSize, &pos));
}
blockSize = ReadBits(kBlockSizeBits);
ReadLevelTable();
ReadCTable();
RINOK(ReadPTable(pbit));
}
blockSize--;
UInt32 c = m_CHuffmanDecoder.Decode(&m_InBitStream);
if (c < 256)
{
m_OutWindowStream.PutByte((Byte)c);
pos++;
}
else if (c >= kNumCSymbols)
return S_FALSE;
else
{
// offset = (interface->method == LARC_METHOD_NUM) ? 0x100 - 2 : 0x100 - 3;
UInt32 len = c - 256 + kMinMatch;
UInt32 distance = m_PHuffmanDecoder.Decode(&m_InBitStream);
if (distance != 0)
distance = (1 << (distance - 1)) + ReadBits(distance - 1);
if (distance >= pos)
return S_FALSE;
if (pos + len > *outSize)
len = (UInt32)(*outSize - pos);
pos += len;
m_OutWindowStream.CopyBlock(distance, len);
}
}
coderReleaser.NeedFlush = false;
return m_OutWindowStream.Flush();
}
STDMETHODIMP CCoder::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; }
}
}}}
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