/* -*- c++ -*- */

/*

 * Copyright 2004,2010 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_bytes_to_syms.h>

#include <gr_io_signature.h>

#include <assert.h>

static const int BITS_PER_BYTE = 8;

gr_bytes_to_syms_sptr 

gr_make_bytes_to_syms ()

{

  return gnuradio::get_initial_sptr(new gr_bytes_to_syms ());

}

gr_bytes_to_syms::gr_bytes_to_syms ()

  : gr_sync_interpolator ("bytes_to_syms",

                          gr_make_io_signature (1, 1, sizeof (unsigned char)),

                          gr_make_io_signature (1, 1, sizeof (float)),

                          BITS_PER_BYTE)

{

}

int

gr_bytes_to_syms::work (int noutput_items,

                        gr_vector_const_void_star &input_items,

                        gr_vector_void_star &output_items)

{

  const unsigned char *in = (unsigned char *) input_items[0];

  float *out = (float *) output_items[0];

  assert (noutput_items % BITS_PER_BYTE == 0);

  for (int i = 0; i < noutput_items / BITS_PER_BYTE; i++){

    int x = in[i];

    *out++ = (((x >> 7) & 0x1) << 1) - 1;

    *out++ = (((x >> 6) & 0x1) << 1) - 1;

    *out++ = (((x >> 5) & 0x1) << 1) - 1;

    *out++ = (((x >> 4) & 0x1) << 1) - 1;

    *out++ = (((x >> 3) & 0x1) << 1) - 1;

    *out++ = (((x >> 2) & 0x1) << 1) - 1;

    *out++ = (((x >> 1) & 0x1) << 1) - 1;

    *out++ = (((x >> 0) & 0x1) << 1) - 1;

  }

  return noutput_items;

}