/* -*- c++ -*- */
/*
 * Copyright 2004,2010,2012 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.
 */

/*
 * config.h is generated by configure.  It contains the results
 * of probing for features, options etc.  It should be the first
 * file included in your .cc file.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "square2_ff_impl.h"
#include <gr_io_signature.h>

namespace gr {
  namespace howto {
    
    /*
     * Create a new instance of howto_square2_ff and return a boost
     * shared_ptr. This is effectively the public constructor.
     */
    square2_ff::sptr
    square2_ff::make()
    {
      return gnuradio::get_initial_sptr
	(new square2_ff_impl());
    }

    /*
     * Specify constraints on number of input and output streams.
     * This info is used to construct the input and output signatures
     * (2nd & 3rd args to gr_block's constructor). The input and
     * output signatures are used by the runtime system to check that
     * a valid number and type of inputs and outputs are connected to
     * this block. In this case, we accept only 1 input and 1 output.
     */
    static const int MIN_IN = 1;	// mininum number of input streams
    static const int MAX_IN = 1;	// maximum number of input streams
    static const int MIN_OUT = 1;	// minimum number of output streams
    static const int MAX_OUT = 1;	// maximum number of output streams

    /*
     * The private constructor
     */
    square2_ff_impl::square2_ff_impl()
      : gr_sync_block("square2_ff",
		      gr_make_io_signature(MIN_IN, MAX_IN, sizeof(float)),
		      gr_make_io_signature(MIN_OUT, MAX_OUT, sizeof(float)))
    {
      // nothing else required in this example
    }

    /*
     * Our virtual destructor.
     */
    square2_ff_impl::~square2_ff_impl()
    {
      // nothing else required in this example
    }

    int
    square2_ff_impl::work(int noutput_items,
			  gr_vector_const_void_star &input_items,
			  gr_vector_void_star &output_items)
    {
      const float *in = (const float*)input_items[0];
      float *out = (float*)output_items[0];

      for(int i = 0; i < noutput_items; i++) {
	out[i] = in[i] * in[i];
      }

      // Tell runtime system how many output items we produced.
      return noutput_items;
    }

  } /* namespace howto */
} /* namespace gr */