/* -*- c++ -*- */
/*
 * Copyright 2013,2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio.
 *
 * This 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.
 *
 * This software 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 this software; 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 "sub_source_impl.h"
#include "tag_headers.h"
#include <gnuradio/io_signature.h>

namespace gr {
namespace zeromq {

sub_source::sptr sub_source::make(
    size_t itemsize, size_t vlen, char* address, int timeout, bool pass_tags, int hwm)
{
    return gnuradio::get_initial_sptr(
        new sub_source_impl(itemsize, vlen, address, timeout, pass_tags, hwm));
}

sub_source_impl::sub_source_impl(
    size_t itemsize, size_t vlen, char* address, int timeout, bool pass_tags, int hwm)
    : gr::sync_block("sub_source",
                     gr::io_signature::make(0, 0, 0),
                     gr::io_signature::make(1, 1, itemsize * vlen)),
      base_source_impl(ZMQ_SUB, itemsize, vlen, address, timeout, pass_tags, hwm)
{
    /* Subscribe */
    d_socket->setsockopt(ZMQ_SUBSCRIBE, "", 0);
}

int sub_source_impl::work(int noutput_items,
                          gr_vector_const_void_star& input_items,
                          gr_vector_void_star& output_items)
{
    uint8_t* out = (uint8_t*)output_items[0];
    bool first = true;
    int done = 0;

    /* Process as much as we can */
    while (1) {
        if (has_pending()) {
            /* Flush anything pending */
            done += flush_pending(
                out + (done * d_vsize), noutput_items - done, nitems_written(0) + done);

            /* No more space ? */
            if (done == noutput_items)
                break;
        } else {
            /* Try to get the next message */
            if (!load_message(first))
                break; /* No message, we're done for now */

            /* Not the first anymore */
            first = false;
        }
    }

    return done;
}

} /* namespace zeromq */
} /* namespace gr */

// vim: ts=2 sw=2 expandtab