ECLCompress.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
 
#include <framework/utilities/Utils.h>
 
namespace Belle2 {
  namespace ECL {
 
    class BitStream;
 
    unsigned int ilog2(unsigned int v);
 
    struct width_t {
      unsigned char w0, 
               w1, 
               w2, 
               w3; 
    };
 
    class ECLCompress {
    public:
      virtual ~ECLCompress() {};
 
      virtual void compress(BitStream& out, const int* adc) = 0;
 
      virtual void uncompress(BitStream& in, int* adc) = 0;
    };
 
    class ECLBaseCompress: public ECLCompress {
    public:
      void compress(BitStream& out, const int* adc) override;
      void uncompress(BitStream& out, int* adc) override;
    };
 
    class ECLDeltaCompress: public ECLCompress {
    public:
      void compress(BitStream& out, const int* adc) override;
      void uncompress(BitStream& out, int* adc) override;
    };
 
    class ECLDCTCompress: public ECLCompress {
    public:
      ECLDCTCompress(double scale, double c0, width_t* w);
      void compress(BitStream& out, const int* adc) override;
      void uncompress(BitStream& in, int* adc) override;
    protected:
      const double m_scale; 
      const double m_c0; 
      const width_t* m_widths; 
    };
 
    ECLCompress* selectAlgo(int compAlgo);
  }
}