Checksum.hpp

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// ======================================================================
// \title  CFDP/Checksum/Checksum.hpp
// \author bocchino
// \brief  hpp file for CFDP checksum class
//
// \copyright
// Copyright 2009-2016, by the California Institute of Technology.
// ALL RIGHTS RESERVED.  United States Government Sponsorship
// acknowledged.
//
// ======================================================================
 
#ifndef CFDP_Checksum_HPP
#define CFDP_Checksum_HPP
 
#include <FpConfig.hpp>
 
namespace CFDP {
 
  class Checksum {
 
    public:
 
      // ----------------------------------------------------------------------
      // Types
      // ----------------------------------------------------------------------
 
    public:
 
      // ----------------------------------------------------------------------
      // Construction and destruction
      // ----------------------------------------------------------------------
 
      Checksum();
 
      Checksum(const U32 value);
 
      Checksum(const Checksum &original);
 
      ~Checksum();
 
    public:
 
      // ----------------------------------------------------------------------
      // Public instance methods
      // ----------------------------------------------------------------------
 
      Checksum& operator=(const Checksum& checksum);
 
      bool operator==(const Checksum& checksum) const;
 
      bool operator!=(const Checksum& checksum) const;
 
      void update(const U8* const data,  
                  const U32 offset,      
                  const U32 length       
      );
 
      U32 getValue() const;
 
    PRIVATE:
 
      // ----------------------------------------------------------------------
      // Private instance methods
      // ----------------------------------------------------------------------
 
      void addWordAligned(
          const U8 *const word 
      );
 
      void addWordUnaligned(
          const U8 *const word, 
          const U8 position, 
          const U8 length 
      );
 
      void addByteAtOffset(
          const U8 byte, 
          const U8 offset 
      );
 
    PRIVATE:
 
      // ----------------------------------------------------------------------
      // Private member variables
      // ----------------------------------------------------------------------
 
      U32 m_value;
 
    };
 
}
 
#endif