/* -*- c++ -*- */

/*

 * Copyright 2007 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_GR_GLFSR_SOURCE_B_H

#define INCLUDED_GR_GLFSR_SOURCE_B_H

#include <gr_sync_block.h>

class gri_glfsr;

class gr_glfsr_source_b;

typedef boost::shared_ptr<gr_glfsr_source_b> gr_glfsr_source_b_sptr;

gr_glfsr_source_b_sptr gr_make_glfsr_source_b(int degree, bool repeat=true, int mask=0, int seed=1);

/*!

 * \brief Galois LFSR pseudo-random source

 * \ingroup source_blk

 */

class gr_glfsr_source_b : public gr_sync_block 

{

 private:

  friend gr_glfsr_source_b_sptr

  gr_make_glfsr_source_b(int degree, bool repeat, int mask, int seed);

  gri_glfsr *d_glfsr;

  bool d_repeat;

  unsigned int d_index;

  unsigned int d_length;

  gr_glfsr_source_b(int degree, bool repeat, int mask, int seed);

 public:

  ~gr_glfsr_source_b();

  int work(int noutput_items,

           gr_vector_const_void_star &input_items,

           gr_vector_void_star &output_items);

  unsigned int period() const { return d_length; }

  int mask() const;

};

#endif /* INCLUDED_GR_GLFSR_SOURCE_B_H */