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#include "LiteralCoder.h"
using namespace NCompression;
using namespace NArithmetic;
namespace NLiteral {
void CEncoder2::Init()
{
for (int i = 0; i < 3; i++)
for (int j = 1; j < (1 << 8); j++)
m_Encoders[i][j].Init();
}
void CEncoder2::Encode(CMyRangeEncoder *aRangeEncoder,
bool aMatchMode, BYTE aMatchByte, BYTE aSymbol)
{
UINT32 aContext = 1;
bool aSame = true;
for (int i = 7; i >= 0; i--)
{
UINT32 aBit = (aSymbol >> i) & 1;
unsigned aState;
if (aMatchMode && aSame)
{
UINT32 aMatchBit = (aMatchByte >> i) & 1;
aState = 1 + aMatchBit;
aSame = (aMatchBit == aBit);
}
else
aState = 0;
m_Encoders[aState][aContext].Encode(aRangeEncoder, aBit);
aContext = (aContext << 1) | aBit;
}
}
UINT32 CEncoder2::GetPrice(bool aMatchMode, BYTE aMatchByte, BYTE aSymbol) const
{
UINT32 aPrice = 0;
UINT32 aContext = 1;
int i = 7;
if (aMatchMode)
{
for (; i >= 0; i--)
{
UINT32 aMatchBit = (aMatchByte >> i) & 1;
UINT32 aBit = (aSymbol >> i) & 1;
aPrice += m_Encoders[1 + aMatchBit][aContext].GetPrice(aBit);
aContext = (aContext << 1) | aBit;
if (aMatchBit != aBit)
{
i--;
break;
}
}
}
for (; i >= 0; i--)
{
UINT32 aBit = (aSymbol >> i) & 1;
aPrice += m_Encoders[0][aContext].GetPrice(aBit);
aContext = (aContext << 1) | aBit;
}
return aPrice;
}
}
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