/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/CxxUtils/CxxUtils/BitUnpacker.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
// $Id$
#ifndef CXXUTILS_BITUNPACKER_H
#define CXXUTILS_BITUNPACKER_H


#include <stdint.h>
#include <cassert>


namespace CxxUtils {


template <class STREAM>
class BitUnpacker
{
public:
  BitUnpacker (uint8_t nbits, STREAM& stream);


  uint32_t unpack();


private:
  uint32_t m_buf;

  uint8_t m_nbuf;

  uint8_t m_nbits;

  STREAM& m_stream;

  uint32_t m_mask;
};


template <class STREAM>
class BitUnpacker8
{
public:
  BitUnpacker8 (STREAM& stream);


  BitUnpacker8 (uint8_t nbits, STREAM& stream);


  uint32_t unpack();


private:
  uint32_t m_buf;

  uint8_t m_nbuf;

  STREAM& m_stream;
};


template <class STREAM>
class BitUnpacker16
{
public:
  BitUnpacker16 (STREAM& stream);


  BitUnpacker16 (uint8_t nbits, STREAM& stream);


  uint32_t unpack();


private:
  uint32_t m_buf;

  uint8_t m_nbuf;

  STREAM& m_stream;
};


} // namespace CxxUtils


#include "CxxUtils/BitUnpacker.icc"


#endif // not CXXUTILS_BITUNPACKER_H

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