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#ifndef __LITERALCODER_H
#define __LITERALCODER_H
#include "AriBitCoder.h"
#include "RCDefs.h"
namespace NLiteral {
const int kNumMoveBits = 5;
class CEncoder2
{
CMyBitEncoder<kNumMoveBits> m_Encoders[3][1 << 8];
public:
void Init();
void Encode(CMyRangeEncoder *aRangeEncoder, bool aMatchMode, BYTE aMatchByte, BYTE aSymbol);
UINT32 GetPrice(bool aMatchMode, BYTE aMatchByte, BYTE aSymbol) const;
};
class CDecoder2
{
CMyBitDecoder<kNumMoveBits> m_Decoders[3][1 << 8];
public:
void Init()
{
for (int i = 0; i < 3; i++)
for (int j = 1; j < (1 << 8); j++)
m_Decoders[i][j].Init();
}
BYTE DecodeNormal(CMyRangeDecoder *aRangeDecoder)
{
UINT32 aSymbol = 1;
RC_INIT_VAR
do
{
RC_GETBIT(kNumMoveBits, m_Decoders[0][aSymbol].m_Probability, aSymbol)
}
while (aSymbol < 0x100);
RC_FLUSH_VAR
return aSymbol;
}
BYTE DecodeWithMatchByte(CMyRangeDecoder *aRangeDecoder, BYTE aMatchByte)
{
UINT32 aSymbol = 1;
RC_INIT_VAR
do
{
UINT32 aMatchBit = (aMatchByte >> 7) & 1;
aMatchByte <<= 1;
UINT32 aBit;
RC_GETBIT2(kNumMoveBits, m_Decoders[1 + aMatchBit][aSymbol].m_Probability, aSymbol,
aBit = 0, aBit = 1)
if (aMatchBit != aBit)
{
while (aSymbol < 0x100)
{
RC_GETBIT(kNumMoveBits, m_Decoders[0][aSymbol].m_Probability, aSymbol)
}
break;
}
}
while (aSymbol < 0x100);
RC_FLUSH_VAR
return aSymbol;
}
};
class CEncoder
{
CEncoder2 *m_Coders;
UINT32 m_NumPrevBits;
UINT32 m_NumPosBits;
UINT32 m_PosMask;
public:
CEncoder(): m_Coders(0) {}
~CEncoder() { Free(); }
void Free()
{
delete []m_Coders;
m_Coders = 0;
}
void Create(UINT32 aNumPosBits, UINT32 aNumPrevBits)
{
Free();
m_NumPosBits = aNumPosBits;
m_PosMask = (1 << aNumPosBits) - 1;
m_NumPrevBits = aNumPrevBits;
UINT32 aNumStates = 1 << (m_NumPrevBits + m_NumPosBits);
m_Coders = new CEncoder2[aNumStates];
}
void Init()
{
UINT32 aNumStates = 1 << (m_NumPrevBits + m_NumPosBits);
for (UINT32 i = 0; i < aNumStates; i++)
m_Coders[i].Init();
}
UINT32 GetState(UINT32 aPos, BYTE aPrevByte) const
{ return ((aPos & m_PosMask) << m_NumPrevBits) + (aPrevByte >> (8 - m_NumPrevBits)); }
void Encode(CMyRangeEncoder *aRangeEncoder, UINT32 aPos, BYTE aPrevByte,
bool aMatchMode, BYTE aMatchByte, BYTE aSymbol)
{ m_Coders[GetState(aPos, aPrevByte)].Encode(aRangeEncoder, aMatchMode,
aMatchByte, aSymbol); }
UINT32 GetPrice(UINT32 aPos, BYTE aPrevByte, bool aMatchMode, BYTE aMatchByte, BYTE aSymbol) const
{ return m_Coders[GetState(aPos, aPrevByte)].GetPrice(aMatchMode, aMatchByte, aSymbol); }
};
class CDecoder
{
CDecoder2 *m_Coders;
UINT32 m_NumPrevBits;
UINT32 m_NumPosBits;
UINT32 m_PosMask;
public:
CDecoder(): m_Coders(0) {}
~CDecoder() { Free(); }
void Free()
{
delete []m_Coders;
m_Coders = 0;
}
void Create(UINT32 aNumPosBits, UINT32 aNumPrevBits)
{
Free();
m_NumPosBits = aNumPosBits;
m_PosMask = (1 << aNumPosBits) - 1;
m_NumPrevBits = aNumPrevBits;
UINT32 aNumStates = 1 << (m_NumPrevBits + m_NumPosBits);
m_Coders = new CDecoder2[aNumStates];
}
void Init()
{
UINT32 aNumStates = 1 << (m_NumPrevBits + m_NumPosBits);
for (UINT32 i = 0; i < aNumStates; i++)
m_Coders[i].Init();
}
UINT32 GetState(UINT32 aPos, BYTE aPrevByte) const
{ return ((aPos & m_PosMask) << m_NumPrevBits) + (aPrevByte >> (8 - m_NumPrevBits)); }
BYTE DecodeNormal(CMyRangeDecoder *aRangeDecoder, UINT32 aPos, BYTE aPrevByte)
{ return m_Coders[GetState(aPos, aPrevByte)].DecodeNormal(aRangeDecoder); }
BYTE DecodeWithMatchByte(CMyRangeDecoder *aRangeDecoder, UINT32 aPos, BYTE aPrevByte, BYTE aMatchByte)
{ return m_Coders[GetState(aPos, aPrevByte)].DecodeWithMatchByte(aRangeDecoder, aMatchByte); }
};
}
#endif
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