/* -*- c++ -*- */
/*
 * Copyright 2015-2016 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 "protocol_formatter_async_impl.h"
#include <gnuradio/io_signature.h>
#include <stdio.h>
#include <volk/volk.h>

namespace gr {
namespace digital {

protocol_formatter_async::sptr
protocol_formatter_async::make(const header_format_base::sptr& format)
{
    return gnuradio::get_initial_sptr(new protocol_formatter_async_impl(format));
}

protocol_formatter_async_impl::protocol_formatter_async_impl(
    const header_format_base::sptr& format)
    : block("protocol_formatter_async",
            io_signature::make(0, 0, 0),
            io_signature::make(0, 0, 0))
{
    d_format = format;

    d_in_port = pmt::mp("in");
    d_hdr_port = pmt::mp("header");
    d_pld_port = pmt::mp("payload");

    message_port_register_in(d_in_port);
    message_port_register_out(d_hdr_port);
    message_port_register_out(d_pld_port);

    set_msg_handler(d_in_port,
                    boost::bind(&protocol_formatter_async_impl::append, this, _1));
}

protocol_formatter_async_impl::~protocol_formatter_async_impl() {}

void protocol_formatter_async_impl::append(pmt::pmt_t msg)
{
    // extract input pdu
    pmt::pmt_t meta(pmt::car(msg));
    pmt::pmt_t input(pmt::cdr(msg));
    pmt::pmt_t header, output;

    size_t pkt_len = 0;
    const uint8_t* bytes_in = pmt::u8vector_elements(input, pkt_len);

    // Pad the payload with 0's
    uint8_t* payload =
        (uint8_t*)volk_malloc(pkt_len * sizeof(uint8_t), volk_get_alignment());
    memcpy(payload, bytes_in, pkt_len * sizeof(uint8_t));
    output = pmt::init_u8vector(pkt_len, payload);
    volk_free(payload);

    // Build the header from the input, metadata, and format
    d_format->format(pkt_len, bytes_in, header, meta);

    // Package and publish
    pmt::pmt_t hdr_pdu = pmt::cons(meta, header);
    pmt::pmt_t pld_pdu = pmt::cons(meta, output);
    message_port_pub(d_hdr_port, hdr_pdu);
    message_port_pub(d_pld_port, pld_pdu);
}

} /* namespace digital */
} /* namespace gr */
