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/* -*- c++ -*- */
/*
* Copyright 2013 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 "random_pdu_impl.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/blocks/pdu.h>
namespace gr {
namespace blocks {
random_pdu::sptr
random_pdu::make(int min_items, int max_items, char byte_mask, int length_modulo)
{
return gnuradio::get_initial_sptr(new random_pdu_impl(min_items, max_items, byte_mask, length_modulo));
}
random_pdu_impl::random_pdu_impl(int min_items, int max_items, char byte_mask, int length_modulo)
: block("random_pdu",
io_signature::make (0, 0, 0),
io_signature::make (0, 0, 0)),
d_urange(min_items, max_items),
d_brange(0, 255),
d_rvar(d_rng, d_urange),
d_bvar(d_rng, d_brange),
d_mask(byte_mask),
d_length_modulo(length_modulo)
{
message_port_register_out(PDU_PORT_ID);
message_port_register_in(pmt::mp("generate"));
set_msg_handler(pmt::mp("generate"), boost::bind(&random_pdu_impl::generate_pdu, this, _1));
if(length_modulo < 1)
throw std::runtime_error("length_module must be >= 1");
if(max_items < length_modulo)
throw std::runtime_error("max_items must be >= to length_modulo");
}
bool
random_pdu_impl::start()
{
output_random();
return true;
}
void
random_pdu_impl::output_random()
{
// pick a random vector length
int len = d_rvar();
len = std::max(d_length_modulo, len - len%d_length_modulo);
// fill it with random bytes
std::vector<unsigned char> vec(len);
for (int i=0; i<len; i++)
vec[i] = ((unsigned char) d_bvar()) & d_mask;
// send the vector
pmt::pmt_t vecpmt(pmt::make_blob(&vec[0], len));
pmt::pmt_t pdu(pmt::cons(pmt::PMT_NIL, vecpmt));
message_port_pub(PDU_PORT_ID, pdu);
}
} /* namespace blocks */
}/* namespace gr */
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