3 * Copyright 2008,2010 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
27 #include <gr_additive_scrambler_bb.h>
28 #include <gr_io_signature.h>
30 gr_additive_scrambler_bb_sptr
31 gr_make_additive_scrambler_bb(int mask, int seed, int len, int count)
33 return gnuradio::get_initial_sptr(new gr_additive_scrambler_bb(mask, seed, len, count));
36 gr_additive_scrambler_bb::gr_additive_scrambler_bb(int mask, int seed, int len, int count)
37 : gr_sync_block("additive_scrambler_bb",
38 gr_make_io_signature (1, 1, sizeof (unsigned char)),
39 gr_make_io_signature (1, 1, sizeof (unsigned char))),
40 d_lfsr(mask, seed, len),
47 gr_additive_scrambler_bb::work(int noutput_items,
48 gr_vector_const_void_star &input_items,
49 gr_vector_void_star &output_items)
51 const unsigned char *in = (const unsigned char *) input_items[0];
52 unsigned char *out = (unsigned char *) output_items[0];
54 for (int i = 0; i < noutput_items; i++) {
55 out[i] = in[i]^d_lfsr.next_bit();
57 if (++d_bits == d_count) {