mergePCodeWords.h

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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,
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//  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.
//
//==============================================================================
 
/*
*   mergePCodeWords - Helper function used in X2Sequence and GenXSequence
         Given two bit-packed integers, merge the lower portion of the
         first and the higher portion of the second into a new bit-packed
         integer.  The first_bit argument defines the most significant
         bit of the merged word.  The bits are numbered from 0 - MAX_BIT-1.
*/
 
#include "gnsstkplatform.h"
 
#ifndef MERGEPCODEWORDS_H
#define MERGEPCODEWORDS_H
 
   inline uint32_t merge( uint32_t w1,
                        uint32_t w2,
                        int first_bit )
   {
      uint32_t outword = w1;
      if (first_bit==0) return(outword);
 
      outword <<= first_bit;
      outword |= w2 >> (gnsstk::MAX_BIT - first_bit);
 
      return(outword);
   }
 
#endif   // end of MERGEPCODEWORDS_H