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/*
Copyright (c) 2009-2011 250bpm s.r.o.
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2011 VMware, Inc.
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "encoder.hpp"
#include "session_base.hpp"
#include "likely.hpp"
#include "wire.hpp"
zmq::encoder_t::encoder_t (size_t bufsize_) :
encoder_base_t <encoder_t> (bufsize_),
session (NULL)
{
int rc = in_progress.init ();
errno_assert (rc == 0);
// Write 0 bytes to the batch and go to message_ready state.
next_step (NULL, 0, &encoder_t::message_ready, true);
}
zmq::encoder_t::~encoder_t ()
{
int rc = in_progress.close ();
errno_assert (rc == 0);
}
void zmq::encoder_t::set_session (session_base_t *session_)
{
session = session_;
}
bool zmq::encoder_t::size_ready ()
{
// Write message body into the buffer.
next_step (in_progress.data (), in_progress.size (),
&encoder_t::message_ready, false);
return true;
}
bool zmq::encoder_t::message_ready ()
{
// Destroy content of the old message.
int rc = in_progress.close ();
errno_assert (rc == 0);
// 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 (unlikely (!session)) {
rc = in_progress.init ();
errno_assert (rc == 0);
return false;
}
rc = session->read (&in_progress);
if (unlikely (rc != 0)) {
errno_assert (errno == EAGAIN);
rc = in_progress.init ();
errno_assert (rc == 0);
return false;
}
// Get the message size.
size_t size = in_progress.size ();
// 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 () & ~msg_t::shared);
next_step (tmpbuf, 2, &encoder_t::size_ready,
!(in_progress.flags () & msg_t::more));
}
else {
tmpbuf [0] = 0xff;
put_uint64 (tmpbuf + 1, size);
tmpbuf [9] = (in_progress.flags () & ~msg_t::shared);
next_step (tmpbuf, 10, &encoder_t::size_ready,
!(in_progress.flags () & msg_t::more));
}
return true;
}
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