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

/*

 * Copyright 2008,2010 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 <gr_scrambler_bb.h>

#include <gr_io_signature.h>

gr_scrambler_bb_sptr

gr_make_scrambler_bb(int mask, int seed, int len)

{

  return gnuradio::get_initial_sptr(new gr_scrambler_bb(mask, seed, len));

}

gr_scrambler_bb::gr_scrambler_bb(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)

{

}

int

gr_scrambler_bb::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;

}