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/* -*- c++ -*- */
/*
* Copyright 2005,2010 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_message_source.h>
#include <gr_io_signature.h>
#include <cstdio>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdexcept>
#include <string.h>
// public constructor that returns a shared_ptr
gr_message_source_sptr
gr_make_message_source(size_t itemsize, int msgq_limit)
{
return gnuradio::get_initial_sptr(new gr_message_source(itemsize, msgq_limit));
}
// public constructor that takes existing message queue
gr_message_source_sptr
gr_make_message_source(size_t itemsize, gr_msg_queue_sptr msgq)
{
return gnuradio::get_initial_sptr(new gr_message_source(itemsize, msgq));
}
gr_message_source::gr_message_source (size_t itemsize, int msgq_limit)
: gr_sync_block("message_source",
gr_make_io_signature(0, 0, 0),
gr_make_io_signature(1, 1, itemsize)),
d_itemsize(itemsize), d_msgq(gr_make_msg_queue(msgq_limit)), d_msg_offset(0), d_eof(false)
{
}
gr_message_source::gr_message_source (size_t itemsize, gr_msg_queue_sptr msgq)
: gr_sync_block("message_source",
gr_make_io_signature(0, 0, 0),
gr_make_io_signature(1, 1, itemsize)),
d_itemsize(itemsize), d_msgq(msgq), d_msg_offset(0), d_eof(false)
{
}
gr_message_source::~gr_message_source()
{
}
int
gr_message_source::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
char *out = (char *) output_items[0];
int nn = 0;
while (nn < noutput_items){
if (d_msg){
//
// Consume whatever we can from the current message
//
int mm = std::min(noutput_items - nn, (int)((d_msg->length() - d_msg_offset) / d_itemsize));
memcpy (out, &(d_msg->msg()[d_msg_offset]), mm * d_itemsize);
nn += mm;
out += mm * d_itemsize;
d_msg_offset += mm * d_itemsize;
assert(d_msg_offset <= d_msg->length());
if (d_msg_offset == d_msg->length()){
if (d_msg->type() == 1) // type == 1 sets EOF
d_eof = true;
d_msg.reset();
}
}
else {
//
// No current message
//
if (d_msgq->empty_p() && nn > 0){ // no more messages in the queue, return what we've got
break;
}
if (d_eof)
return -1;
d_msg = d_msgq->delete_head(); // block, waiting for a message
d_msg_offset = 0;
if ((d_msg->length() % d_itemsize) != 0)
throw std::runtime_error("msg length is not a multiple of d_itemsize");
}
}
return nn;
}
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