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/*
Copyright (c) 2007-2013 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 <stdlib.h>
#include <string.h>
#include "platform.hpp"
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include "v2_protocol.hpp"
#include "v2_decoder.hpp"
#include "likely.hpp"
#include "wire.hpp"
#include "err.hpp"
zmq::v2_decoder_t::v2_decoder_t (size_t bufsize_, int64_t maxmsgsize_) :
decoder_base_t <v2_decoder_t> (bufsize_),
msg_flags (0),
maxmsgsize (maxmsgsize_)
{
int rc = in_progress.init ();
errno_assert (rc == 0);
// At the beginning, read one byte and go to flags_ready state.
next_step (tmpbuf, 1, &v2_decoder_t::flags_ready);
}
zmq::v2_decoder_t::~v2_decoder_t ()
{
int rc = in_progress.close ();
errno_assert (rc == 0);
}
int zmq::v2_decoder_t::flags_ready ()
{
msg_flags = 0;
if (tmpbuf [0] & v2_protocol_t::more_flag)
msg_flags |= msg_t::more;
if (tmpbuf [0] & v2_protocol_t::command_flag)
msg_flags |= msg_t::command;
// The payload length is either one or eight bytes,
// depending on whether the 'large' bit is set.
if (tmpbuf [0] & v2_protocol_t::large_flag)
next_step (tmpbuf, 8, &v2_decoder_t::eight_byte_size_ready);
else
next_step (tmpbuf, 1, &v2_decoder_t::one_byte_size_ready);
return 0;
}
int zmq::v2_decoder_t::one_byte_size_ready ()
{
// Message size must not exceed the maximum allowed size.
if (maxmsgsize >= 0)
if (unlikely (tmpbuf [0] > static_cast <uint64_t> (maxmsgsize))) {
errno = EMSGSIZE;
return -1;
}
// in_progress is initialised at this point so in theory we should
// close it before calling zmq_msg_init_size, however, it's a 0-byte
// message and thus we can treat it as uninitialised...
int rc = in_progress.init_size (tmpbuf [0]);
if (unlikely (rc)) {
errno_assert (errno == ENOMEM);
rc = in_progress.init ();
errno_assert (rc == 0);
errno = ENOMEM;
return -1;
}
in_progress.set_flags (msg_flags);
next_step (in_progress.data (), in_progress.size (),
&v2_decoder_t::message_ready);
return 0;
}
int zmq::v2_decoder_t::eight_byte_size_ready ()
{
// The payload size is encoded as 64-bit unsigned integer.
// The most significant byte comes first.
const uint64_t msg_size = get_uint64 (tmpbuf);
// Message size must not exceed the maximum allowed size.
if (maxmsgsize >= 0)
if (unlikely (msg_size > static_cast <uint64_t> (maxmsgsize))) {
errno = EMSGSIZE;
return -1;
}
// Message size must fit into size_t data type.
if (unlikely (msg_size != static_cast <size_t> (msg_size))) {
errno = EMSGSIZE;
return -1;
}
// in_progress is initialised at this point so in theory we should
// close it before calling init_size, however, it's a 0-byte
// message and thus we can treat it as uninitialised.
int rc = in_progress.init_size (static_cast <size_t> (msg_size));
if (unlikely (rc)) {
errno_assert (errno == ENOMEM);
rc = in_progress.init ();
errno_assert (rc == 0);
errno = ENOMEM;
return -1;
}
in_progress.set_flags (msg_flags);
next_step (in_progress.data (), in_progress.size (),
&v2_decoder_t::message_ready);
return 0;
}
int zmq::v2_decoder_t::message_ready ()
{
// Message is completely read. Signal this to the caller
// and prepare to decode next message.
next_step (tmpbuf, 1, &v2_decoder_t::flags_ready);
return 1;
}
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