CRC32.hpp

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#pragma ident "$Id: CRC32.hpp 1644 2009-01-27 19:26:14Z ckiesch $"


//============================================================================
//
//  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_CRC32_H
#define VDRAW_CRC32_H

#include <string>

// Based on
// http://burtleburtle.net/bob/c/crc.c
// and
// http://www.csbruce.com/~csbruce/software/crc32.c

namespace vdraw
{

  class CRC32
  {
    protected:
      static const unsigned int crc_table[256];

      unsigned int crc32;

    public:
      CRC32()
      {
        reset();
      }

      inline void reset()
      {
        crc32 = 0xffffffff;
      }

      inline unsigned int getValue() const
      {
        return crc32 ^ 0xffffffff;
      }

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

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

  }; // class CRC32


} // namespace vdraw

#endif //VDRAW_CRC32_H

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