atsc_interleaver_fifo.h

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/* -*- c++ -*- */
/*
 * Copyright 2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_DTV_ATSC_INTERLEAVER_FIFO_H
#define INCLUDED_DTV_ATSC_INTERLEAVER_FIFO_H

#include <string.h>

namespace gr {
  namespace dtv {

    template<class symbol_type>
    class interleaver_fifo {
    public:

      interleaver_fifo(unsigned int size);
      ~interleaver_fifo();

      //! reset interleaver (flushes contents and resets commutator)
      void reset ();

      //! stuff a symbol into the fifo and return the oldest
      symbol_type stuff(symbol_type input) {
        if (m_size == 0)
          return input;

        symbol_type retval = m_fifo[m_position];
        m_fifo[m_position] = input;
        m_position++;
        if (m_position >= m_size)
          m_position = 0;

        return retval;
      }

    protected:
      unsigned int      m_size;
      unsigned int      m_position;
      symbol_type       *m_fifo;
    };

    template<class symbol_type>
    interleaver_fifo<symbol_type>::interleaver_fifo(unsigned int size)
    {
      m_size = size;
      m_position = 0;
      m_fifo = new symbol_type[size];
      memset (m_fifo, 0, m_size * sizeof(symbol_type));
    }

    template<class symbol_type>
    interleaver_fifo<symbol_type>::~interleaver_fifo()
    {
      delete [] m_fifo;
    }

    template<class symbol_type> void
    interleaver_fifo<symbol_type>::reset()
    {
      m_position = 0;
      memset (m_fifo, 0, m_size * sizeof (symbol_type));
    }

  } /* namespace dtv */
} /* namespace gr */

#endif /* INCLUDED_DTV_ATSC_INTERLEAVER_FIFO_H */