/* -*- c++ -*- */
/*
 * Copyright 2008,2010,2012 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "scrambler_bb_impl.h"
#include <gr_io_signature.h>

namespace gr {
  namespace digital {

    scrambler_bb::sptr
    scrambler_bb::make(int mask, int seed, int len)
    {
      return gnuradio::get_initial_sptr
	(new scrambler_bb_impl(mask, seed, len));
    }

    scrambler_bb_impl::scrambler_bb_impl(int mask, int seed, int len)
      : gr_sync_block("scrambler_bb",
		      gr_make_io_signature(1, 1, sizeof(unsigned char)),
		      gr_make_io_signature(1, 1, sizeof(unsigned char))),
	d_lfsr(mask, seed, len)
    {
    }

    scrambler_bb_impl::~scrambler_bb_impl()
    {
    }

    int
    scrambler_bb_impl::work(int noutput_items,
			    gr_vector_const_void_star &input_items,
			    gr_vector_void_star &output_items)
    {
      const unsigned char *in = (const unsigned char*)input_items[0];
      unsigned char *out = (unsigned char*)output_items[0];

      for(int i = 0; i < noutput_items; i++) {
	out[i] = d_lfsr.next_bit_scramble(in[i]);
      }

      return noutput_items;
    }

  } /* namespace digital */
} /* namespace gr */