entropy_range_coder.h

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/*
 * Software License Agreement (BSD License)
 *
 *  Copyright (c) 2011, Willow Garage, Inc.
 *  All rights reserved.
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 *     notice, this list of conditions and the following disclaimer.
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 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 *
 * Range Coder based on Dmitry Subbotin's carry-less implementation (http://www.compression.ru/ds/)
 * Added optimized symbol lookup and added implementation for static range coding (uses fixed precomputed frequency table)
 *
 * Author: Julius Kammerl (julius@kammerl.de)
 */

#ifndef __PCL_IO_RANGECODING__
#define __PCL_IO_RANGECODING__

#include <map>
#include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <stdio.h>
#include <boost/cstdint.hpp>

namespace pcl
{

  using boost::uint8_t;
  using boost::uint32_t;
  using boost::uint64_t;


  class AdaptiveRangeCoder
  {

  public:

    AdaptiveRangeCoder () : outputCharVector_ ()
    {
    }

    virtual
    ~AdaptiveRangeCoder ()
    {
    }

    unsigned long
    encodeCharVectorToStream (const std::vector<char>& inputByteVector_arg, std::ostream& outputByteStream_arg);

    unsigned long
    decodeStreamToCharVector (std::istream& inputByteStream_arg, std::vector<char>& outputByteVector_arg);

  protected:
    typedef boost::uint32_t DWord; // 4 bytes

  private:
    std::vector<char> outputCharVector_;

  };


  class StaticRangeCoder
  {
    public:
      StaticRangeCoder () :
        cFreqTable_ (65537), outputCharVector_ ()
      {
      }

      virtual
      ~StaticRangeCoder ()
      {
      }

      unsigned long
      encodeIntVectorToStream (std::vector<unsigned int>& inputIntVector_arg, std::ostream& outputByterStream_arg);

      unsigned long
      decodeStreamToIntVector (std::istream& inputByteStream_arg, std::vector<unsigned int>& outputIntVector_arg);

      unsigned long
      encodeCharVectorToStream (const std::vector<char>& inputByteVector_arg, std::ostream& outputByteStream_arg);

      unsigned long
      decodeStreamToCharVector (std::istream& inputByteStream_arg, std::vector<char>& outputByteVector_arg);

    protected:
      typedef boost::uint32_t DWord; // 4 bytes

      inline double
      Log2 (double n_arg)
      {
        return log (n_arg) / log (2.0);
      }

    private:
      std::vector<uint64_t> cFreqTable_;

      std::vector<char> outputCharVector_;

  };
}


//#include "impl/entropy_range_coder.hpp"

#endif