Adler32.hpp

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#pragma ident "$Id: Adler32.hpp 2535 2011-03-25 15:58:06Z ccutlip $"


//============================================================================
//
//  This file is part of GPSTk, the GPS Toolkit.
//
//  The GPSTk is free software; you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published
//  by the Free Software Foundation; either version 2.1 of the License, or
//  any later version.
//
//  The GPSTk is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with GPSTk; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//  
//  Copyright 2004, The University of Texas at Austin
//
//============================================================================


#ifndef VDRAW_ALDER32_H
#define VDRAW_ALDER32_H

#include <string>
#include <memory>

//http://en.wikipedia.org/wiki/Adler-32

namespace vdraw
{

  class Adler32
  {
    protected:
      static const unsigned int mod = 65521;

      unsigned int a;

      unsigned int b;

    public:
      Adler32()
      {
        reset();
      }


      inline void reset()
      {
        a=1; b=0;
      }

      inline unsigned int getValue() const
      {
        return (b << 16) | a;
      }

      void update(const std::string &str)
      {
        update(str.c_str(),str.length());
      }

      void update(const std::auto_ptr<std::string> &str)
      {
        update(str->c_str(),str->length());
      }

      void update(const char* buf, unsigned int len);

  }; // class Adler32


} // namespace vdraw

#endif //VDRAW_ALDER32_H

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