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// LzhDecoder.h
#ifndef __COMPRESS_LZH_DECODER_H
#define __COMPRESS_LZH_DECODER_H
#include "../../Common/MyCom.h"
#include "../ICoder.h"
#include "../Common/InBuffer.h"
#include "BitmDecoder.h"
#include "HuffmanDecoder.h"
#include "LzOutWindow.h"
namespace NCompress {
namespace NLzh {
namespace NDecoder {
const int kMaxHuffmanLen = 16; // Check it
const int kNumSpecLevelSymbols = 3;
const int kNumLevelSymbols = kNumSpecLevelSymbols + kMaxHuffmanLen;
const int kDictBitsMax = 16;
const int kNumDistanceSymbols = kDictBitsMax + 1;
const int kMaxMatch = 256;
const int kMinMatch = 3;
const int kNumCSymbols = 256 + kMaxMatch + 2 - kMinMatch;
template <UInt32 m_NumSymbols>
class CHuffmanDecoder:public NCompress::NHuffman::CDecoder<kMaxHuffmanLen, m_NumSymbols>
{
public:
int Symbol;
template <class TBitDecoder>
UInt32 Decode(TBitDecoder *bitStream)
{
if (Symbol >= 0)
return (UInt32)Symbol;
return DecodeSymbol(bitStream);
}
};
class CCoder :
public ICompressCoder,
public CMyUnknownImp
{
CLzOutWindow m_OutWindowStream;
NBitm::CDecoder<CInBuffer> m_InBitStream;
int m_NumDictBits;
CHuffmanDecoder<kNumLevelSymbols> m_LevelHuffman;
CHuffmanDecoder<kNumDistanceSymbols> m_PHuffmanDecoder;
CHuffmanDecoder<kNumCSymbols> m_CHuffmanDecoder;
void ReleaseStreams()
{
m_OutWindowStream.ReleaseStream();
m_InBitStream.ReleaseStream();
}
class CCoderReleaser
{
CCoder *m_Coder;
public:
bool NeedFlush;
CCoderReleaser(CCoder *coder): m_Coder(coder), NeedFlush(true) {}
~CCoderReleaser()
{
if (NeedFlush)
m_Coder->m_OutWindowStream.Flush();
m_Coder->ReleaseStreams();
}
};
friend class CCoderReleaser;
void MakeTable(int nchar, Byte *bitlen, int tablebits,
UInt32 *table, int tablesize);
UInt32 ReadBits(int numBits);
HRESULT ReadLevelTable();
HRESULT ReadPTable(int numBits);
HRESULT ReadCTable();
public:
MY_UNKNOWN_IMP
STDMETHOD(CodeReal)(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress);
STDMETHOD(Code)(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress);
void SetDictionary(int numDictBits) { m_NumDictBits = numDictBits; }
CCoder(): m_NumDictBits(0) {}
};
}}}
#endif
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