CodeBuffer.hpp

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//==============================================================================
//
//  This file is part of GNSSTk, the ARL:UT GNSS Toolkit.
//
//  The GNSSTk 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 3.0 of the License, or
//  any later version.
//
//  The GNSSTk 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 GNSSTk; if not, write to the Free Software Foundation,
//  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
//
//  This software was developed by Applied Research Laboratories at the
//  University of Texas at Austin.
//  Copyright 2004-2022, The Board of Regents of The University of Texas System
//
//==============================================================================
 
//==============================================================================
//
//  This software was 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.
//
//==============================================================================
 
#ifndef CODEBUFFER_HPP
#define CODEBUFFER_HPP
 
   // Library headers
#include "CommonTime.hpp"
 
   // Project headers
#include "PCodeConst.hpp"
 
namespace gnsstk
{
 
 
   class CodeBuffer
   {
      public:
         //enum codeType { P_CODE, Y_CODE, BOTH };
 
         CodeBuffer( const int SVPRNID );
         ~CodeBuffer( );
         CodeBuffer& operator=( const CodeBuffer& c );
 
         void updateBufferStatus( const gnsstk::CommonTime& dt,
                                  const codeType PYFlag );
 
         void updateBufferStatus( const codeType PYFlag ) { POrYCode = PYFlag; }
 
         const gnsstk::CommonTime& 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;
         gnsstk::CommonTime 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