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/* -*- c++ -*- */
/*
* Copyright 2014 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 <gnuradio/io_signature.h>
#include <volk/volk.h>
#include "crc32_async_bb_impl.h"
namespace gr {
namespace digital {
crc32_async_bb::sptr
crc32_async_bb::make(bool check)
{
return gnuradio::get_initial_sptr
(new crc32_async_bb_impl(check));
}
crc32_async_bb_impl::crc32_async_bb_impl(bool check)
: block("crc32_async_bb",
io_signature::make(0, 0, 0),
io_signature::make(0, 0, 0)),
d_check(check), d_npass(0), d_nfail(0)
{
d_in_port = pmt::mp("in");
d_out_port = pmt::mp("out");
message_port_register_in(d_in_port);
message_port_register_out(d_out_port);
if(check)
set_msg_handler(d_in_port, boost::bind(&crc32_async_bb_impl::check, this ,_1) );
else
set_msg_handler(d_in_port, boost::bind(&crc32_async_bb_impl::calc, this ,_1) );
}
crc32_async_bb_impl::~crc32_async_bb_impl()
{
}
void
crc32_async_bb_impl::calc(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bytes(pmt::cdr(msg));
unsigned int crc;
size_t pkt_len(0);
const uint8_t* bytes_in = pmt::u8vector_elements(bytes, pkt_len);
uint8_t* bytes_out = (uint8_t*)volk_malloc(4 + pkt_len*sizeof(uint8_t),
volk_get_alignment());
d_crc_impl.reset();
d_crc_impl.process_bytes(bytes_in, pkt_len);
crc = d_crc_impl();
memcpy((void*)bytes_out, (const void*)bytes_in, pkt_len);
memcpy((void*)(bytes_out + pkt_len), &crc, 4); // FIXME big-endian/little-endian, this might be wrong
pmt::pmt_t output = pmt::init_u8vector(pkt_len+4, bytes_out); // this copies the values from bytes_out into the u8vector
pmt::pmt_t msg_pair = pmt::cons(meta, output);
message_port_pub(d_out_port, msg_pair);
volk_free(bytes_out);
}
void
crc32_async_bb_impl::check(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bytes(pmt::cdr(msg));
unsigned int crc;
size_t pkt_len(0);
const uint8_t* bytes_in = pmt::u8vector_elements(bytes, pkt_len);
d_crc_impl.reset();
d_crc_impl.process_bytes(bytes_in, pkt_len-4);
crc = d_crc_impl();
if(crc != *(unsigned int*)(bytes_in+pkt_len-4)) { // Drop package
d_nfail++;
return;
}
d_npass++;
pmt::pmt_t output = pmt::init_u8vector(pkt_len-4, bytes_in);
pmt::pmt_t msg_pair = pmt::cons(meta, output);
message_port_pub(d_out_port, msg_pair);
}
int
crc32_async_bb_impl::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
return noutput_items;
}
} /* namespace digital */
} /* namespace gr */
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