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/* -*- 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "simple_framer_impl.h"
#include <gnuradio/digital/simple_framer_sync.h>
#include <gnuradio/io_signature.h>
#include <assert.h>
#include <string>
namespace gr {
namespace digital {
simple_framer::sptr
simple_framer::make(int payload_bytesize)
{
return gnuradio::get_initial_sptr
(new simple_framer_impl(payload_bytesize));
}
simple_framer_impl::simple_framer_impl(int payload_bytesize)
: block("simple_framer",
io_signature::make(1, 1, sizeof(unsigned char)),
io_signature::make(1, 1, sizeof(unsigned char))),
d_seqno (0),
d_input_block_size (payload_bytesize),
d_output_block_size (payload_bytesize + GRSF_OVERHEAD)
{
set_output_multiple(d_output_block_size);
}
simple_framer_impl::~simple_framer_impl()
{
}
void
simple_framer_impl::forecast(int noutput_items, gr_vector_int &ninput_items_required)
{
assert(noutput_items % d_output_block_size == 0);
int nblocks = noutput_items / d_output_block_size;
int input_required = nblocks * d_input_block_size;
unsigned ninputs = ninput_items_required.size();
for(unsigned int i = 0; i < ninputs; i++)
ninput_items_required[i] = input_required;
}
int
simple_framer_impl::general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const unsigned char *in = (const unsigned char*)input_items[0];
unsigned char *out = (unsigned char*)output_items[0];
int n = 0;
int nblocks = 0;
memset(out, 0x55, noutput_items);
while(n < noutput_items) {
out[0] = (GRSF_SYNC >> 56) & 0xff;
out[1] = (GRSF_SYNC >> 48) & 0xff;
out[2] = (GRSF_SYNC >> 40) & 0xff;
out[3] = (GRSF_SYNC >> 32) & 0xff;
out[4] = (GRSF_SYNC >> 24) & 0xff;
out[5] = (GRSF_SYNC >> 16) & 0xff;
out[6] = (GRSF_SYNC >> 8) & 0xff;
out[7] = (GRSF_SYNC >> 0) & 0xff;
out[8] = d_seqno++;
memcpy(&out[9], in, d_input_block_size);
in += d_input_block_size;
out += d_output_block_size;
n += d_output_block_size;
nblocks++;
}
assert(n == noutput_items);
consume_each(nblocks * d_input_block_size);
return n;
}
} /* namespace digital */
} /* namespace gr */
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