/* -*- c++ -*- */
/* Copyright 2012 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 <gr_io_signature.h>
#include "packet_headergenerator_bb_impl.h"

namespace gr {
  namespace digital {

    packet_headergenerator_bb::sptr
    packet_headergenerator_bb::make(const packet_header_default::sptr &header_formatter)
    {
      return gnuradio::get_initial_sptr (new packet_headergenerator_bb_impl(header_formatter));
    }


    packet_headergenerator_bb::sptr
    packet_headergenerator_bb::make(
      long header_len,
      const std::string &len_tag_key
    )
    {
      const packet_header_default::sptr header_formatter(
	  new packet_header_default(header_len, len_tag_key)
      );
      return gnuradio::get_initial_sptr (new packet_headergenerator_bb_impl(header_formatter));
    }


    packet_headergenerator_bb_impl::packet_headergenerator_bb_impl(
		    const gr::digital::packet_header_default::sptr &header_formatter
		    )
      : gr_tagged_stream_block("packet_headergenerator_bb_impl",
		       gr_make_io_signature(1, 1, sizeof (char)),
		       gr_make_io_signature(1, 1, sizeof (char)),
		       pmt::symbol_to_string(header_formatter->len_tag_key())),
	    d_formatter(header_formatter),
	    d_input_size(1),
	    d_header_len(header_formatter->header_len()),
	    d_len_tag_value(pmt::from_long(d_header_len))
    {
      set_output_multiple(d_header_len);
      // This is the worst case rate, because we don't know the true value, of course
      set_relative_rate(d_header_len);
      set_tag_propagation_policy(TPP_DONT);
    }

    packet_headergenerator_bb_impl::~packet_headergenerator_bb_impl()
    {
    }

    int
    packet_headergenerator_bb_impl::work (int noutput_items,
                       gr_vector_int &ninput_items,
                       gr_vector_const_void_star &input_items,
                       gr_vector_void_star &output_items)
    {
      unsigned char *out = (unsigned char *) output_items[0];
      if (!d_formatter->header_formatter(ninput_items[0], out)) {
	throw std::runtime_error("header formatter returned false.");
      }

      return d_header_len;
    }

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