CodeBuffer.hpp

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#pragma ident "$Id: CodeBuffer.hpp 500 2007-04-27 12:02:53Z ocibu $"


//  CodeBuffer.hpp  

#ifndef CODEBUFFER_HPP
#define CODEBUFFER_HPP

//============================================================================
//
//  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
//
//============================================================================

//============================================================================
//
//This software developed by Applied Research Laboratories at the University of
//Texas at Austin, under contract to an agency or agencies within the U.S. 
//Department of Defense. The U.S. Government retains all rights to use,
//duplicate, distribute, disclose, or release this software. 
//
//Pursuant to DoD Directive 523024 
//
// DISTRIBUTION STATEMENT A: This software has been approved for public 
//                           release, distribution is unlimited.
//
//=============================================================================






   // Library headers
#include "DayTime.hpp"

   // Project headers
#include "PCodeConst.hpp"

namespace gpstk
{
   class CodeBuffer
   {
      public:
         //enum codeType { P_CODE, Y_CODE, BOTH }; 
      
         CodeBuffer( const int SVPRNID );
         ~CodeBuffer( );
         CodeBuffer& operator=( const CodeBuffer& c );
         
         void updateBufferStatus( const gpstk::DayTime& dt, 
                                  const codeType PYFlag );

         void updateBufferStatus( const codeType PYFlag ) { POrYCode = PYFlag; }
         
         const gpstk::DayTime& getCurrentTime( ) { return(currentTime); }
         
         codeType getPYFlag( ) { return(POrYCode); } 
         
         int getPRNID( ) { return(PRNID); }
            
         unsigned long& operator[]( int i );
         const unsigned long& operator[]( const int i ) const;
         
         unsigned long getBit( const long i ) const;
         
         CodeBuffer& operator^=( const CodeBuffer& cb );
     
      protected:  
         CodeBuffer( const CodeBuffer& c );
         unsigned long * buffer;
         int PRNID;
         gpstk::DayTime currentTime;
         codeType POrYCode;
   };

   inline  CodeBuffer::~CodeBuffer( ) { delete [] buffer; }
   inline CodeBuffer& CodeBuffer::operator^=( const CodeBuffer& cb )
   { 
      for (long i=0;i<NUM_6SEC_WORDS;++i) buffer[i] ^= cb.buffer[i];
      return( *this );
   }

   inline unsigned long& CodeBuffer::operator[]( int i )
   {
      return(buffer[i]);
   }

   inline const unsigned long& CodeBuffer::operator[]( int i ) const
   {
      return(buffer[i]);
   }

   inline unsigned long CodeBuffer::getBit( const long i ) const
   {
      unsigned long iret;
      long bNdx = i / MAX_BIT;
      long bitNum = i - (bNdx * MAX_BIT);
      iret = buffer[bNdx];
   
      // Shift LEFT to clear off msbs
      iret <<= bitNum;
      // Then shift RIGHT to clear off lsbs
      iret >>= (MAX_BIT-1);
   
      return iret;
   }
}     // end of namespace
#endif // CODEBUFFER_HPP

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