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// Stream/MSBFEncoder.h
// the Most Significant Bit of byte is First
#pragma once
#ifndef __STREAM_MSBFENCODER_H
#define __STREAM_MSBFENCODER_H
#include "Common/Defs.h"
#include "Interface/IInOutStreams.h"
namespace NStream {
namespace NMSBF {
template<class TOutByte>
class CEncoder
{
TOutByte m_Stream;
UINT32 m_BitPos;
BYTE m_CurByte;
public:
void Init(ISequentialOutStream *aStream)
{
m_Stream.Init(aStream);
m_BitPos = 8;
m_CurByte = 0;
}
HRESULT Flush()
{
if(m_BitPos < 8)
WriteBits(0, m_BitPos);
return m_Stream.Flush();
}
void ReleaseStream()
{
m_Stream.ReleaseStream();
}
void WriteBits(UINT32 aValue, UINT32 aNumBits)
{
while(aNumBits > 0)
{
UINT32 aNumNewBits = MyMin(aNumBits, m_BitPos);
aNumBits -= aNumNewBits;
m_CurByte <<= aNumNewBits;
UINT32 aNewBits = aValue >> aNumBits;
m_CurByte |= BYTE(aNewBits);
aValue -= (aNewBits << aNumBits);
m_BitPos -= aNumNewBits;
if (m_BitPos == 0)
{
m_Stream.WriteByte(m_CurByte);
m_BitPos = 8;
}
}
}
UINT64 GetProcessedSize() const {
return m_Stream.GetProcessedSize() + (8 - m_BitPos + 7) /8; }
};
}}
#endif
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