other-licenses/7zstub/src/7zip/Common/LSBFEncoder.cpp

   1 // LSBFEncoder.cpp
   2
   3 #include "StdAfx.h"
   4
   5 #include "LSBFEncoder.h"
   6 #include "Common/Defs.h"
   7
   8 namespace NStream {
   9 namespace NLSBF {
  10
  11 void CEncoder::WriteBits(UInt32 value, int numBits)
  12 {
  13   while(numBits > 0)
  14   {
  15     if (numBits < m_BitPos)
  16     {
  17       m_CurByte |= (value & ((1 << numBits) - 1)) << (8 - m_BitPos);
  18       m_BitPos -= numBits;
  19       return;
  20     }
  21     numBits -= m_BitPos;
  22     m_Stream.WriteByte((Byte)(m_CurByte | (value << (8 - m_BitPos))));
  23     value >>= m_BitPos;
  24     m_BitPos = 8;
  25     m_CurByte = 0;
  26   }
  27 }
  28
  29 }}