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/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zmq_encoder.hpp"
#include "i_inout.hpp"
#include "wire.hpp"
zmq::zmq_encoder_t::zmq_encoder_t (size_t bufsize_) :
encoder_t <zmq_encoder_t> (bufsize_),
source (NULL)
{
zmq_msg_init (&in_progress);
// Write 0 bytes to the batch and go to message_ready state.
next_step (NULL, 0, &zmq_encoder_t::message_ready, true);
}
zmq::zmq_encoder_t::~zmq_encoder_t ()
{
zmq_msg_close (&in_progress);
}
void zmq::zmq_encoder_t::set_inout (i_inout *source_)
{
source = source_;
}
bool zmq::zmq_encoder_t::size_ready ()
{
// Write message body into the buffer.
next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
&zmq_encoder_t::message_ready, false);
return true;
}
bool zmq::zmq_encoder_t::message_ready ()
{
// Destroy content of the old message.
zmq_msg_close(&in_progress);
// Read new message. If there is none, return false.
// Note that new state is set only if write is successful. That way
// unsuccessful write will cause retry on the next state machine
// invocation.
if (!source || !source->read (&in_progress)) {
zmq_msg_init (&in_progress);
return false;
}
// Get the message size.
size_t size = zmq_msg_size (&in_progress);
// Account for the 'flags' byte.
size++;
// For messages less than 255 bytes long, write one byte of message size.
// For longer messages write 0xff escape character followed by 8-byte
// message size. In both cases 'flags' field follows.
if (size < 255) {
tmpbuf [0] = (unsigned char) size;
tmpbuf [1] = (in_progress.flags & ~ZMQ_MSG_SHARED);
next_step (tmpbuf, 2, &zmq_encoder_t::size_ready,
!(in_progress.flags & ZMQ_MSG_MORE));
}
else {
tmpbuf [0] = 0xff;
put_uint64 (tmpbuf + 1, size);
tmpbuf [9] = (in_progress.flags & ~ZMQ_MSG_SHARED);
next_step (tmpbuf, 10, &zmq_encoder_t::size_ready,
!(in_progress.flags & ZMQ_MSG_MORE));
}
return true;
}
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