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/* -*- c++ -*- */
/*
* Copyright 2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "random_pdu_impl.h"
#include <gnuradio/blocks/pdu.h>
#include <gnuradio/io_signature.h>
namespace gr {
namespace blocks {
random_pdu::sptr
random_pdu::make(int min_items, int max_items, unsigned 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,
unsigned 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_mask(byte_mask),
d_length_modulo(length_modulo)
{
message_port_register_out(pdu::pdu_port_id());
message_port_register_in(pmt::mp("generate"));
set_msg_handler(pmt::mp("generate"),
[this](pmt::pmt_t msg) { this->generate_pdu(msg); });
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_urange(d_rng);
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_brange(d_rng)) & 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::pdu_port_id(), pdu);
}
} /* namespace blocks */
} /* namespace gr */
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