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47 lines
824 B
C++
Executable File
47 lines
824 B
C++
Executable File
// LSBFEncoder.cpp
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#include "StdAfx.h"
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#include "LSBFEncoder.h"
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#include "Common/Defs.h"
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namespace NStream {
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namespace NLSBF {
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void CEncoder::WriteBits(UInt32 value, UInt32 numBits)
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{
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while(numBits > 0)
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{
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UInt32 numNewBits = MyMin(numBits, m_BitPos);
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numBits -= numNewBits;
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UInt32 mask = (1 << numNewBits) - 1;
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m_CurByte |= (value & mask) << (8 - m_BitPos);
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value >>= numNewBits;
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m_BitPos -= numNewBits;
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if (m_BitPos == 0)
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{
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m_Stream.WriteByte(m_CurByte);
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m_BitPos = 8;
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m_CurByte = 0;
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}
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}
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}
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void CReverseEncoder::WriteBits(UInt32 value, UInt32 numBits)
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{
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UInt32 reverseValue = 0;
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for(UInt32 i = 0; i < numBits; i++)
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{
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reverseValue <<= 1;
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reverseValue |= value & 1;
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value >>= 1;
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}
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m_Encoder->WriteBits(reverseValue, numBits);
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}
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}}
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