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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 <limits>
#include "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include "decoder.hpp"
#include "v1_decoder.hpp"
#include "likely.hpp"
#include "wire.hpp"
#include "err.hpp"
zmq::v1_decoder_t::v1_decoder_t (size_t bufsize_, int64_t maxmsgsize_) :
decoder_base_t <v1_decoder_t> (bufsize_),
maxmsgsize (maxmsgsize_)
{
int rc = in_progress.init ();
errno_assert (rc == 0);
// At the beginning, read one byte and go to one_byte_size_ready state.
next_step (tmpbuf, 1, &v1_decoder_t::one_byte_size_ready);
}
zmq::v1_decoder_t::~v1_decoder_t ()
{
int rc = in_progress.close ();
errno_assert (rc == 0);
}
int zmq::v1_decoder_t::one_byte_size_ready ()
{
// First byte of size is read. If it is 0xff read 8-byte size.
// Otherwise allocate the buffer for message data and read the
// message data into it.
if (*tmpbuf == 0xff)
next_step (tmpbuf, 8, &v1_decoder_t::eight_byte_size_ready);
else {
// There has to be at least one byte (the flags) in the message).
if (!*tmpbuf) {
errno = EPROTO;
return -1;
}
if (maxmsgsize >= 0 && (int64_t) (*tmpbuf - 1) > 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 - 1);
if (rc != 0) {
errno_assert (errno == ENOMEM);
rc = in_progress.init ();
errno_assert (rc == 0);
errno = ENOMEM;
return -1;
}
next_step (tmpbuf, 1, &v1_decoder_t::flags_ready);
}
return 0;
}
int zmq::v1_decoder_t::eight_byte_size_ready ()
{
// 8-byte payload length is read. Allocate the buffer
// for message body and read the message data into it.
const uint64_t payload_length = get_uint64 (tmpbuf);
// There has to be at least one byte (the flags) in the message).
if (payload_length == 0) {
errno = EPROTO;
return -1;
}
// Message size must not exceed the maximum allowed size.
if (maxmsgsize >= 0 && payload_length - 1 > (uint64_t) maxmsgsize) {
errno = EMSGSIZE;
return -1;
}
// Message size must fit within range of size_t data type.
if (payload_length - 1 > std::numeric_limits <size_t>::max ()) {
errno = EMSGSIZE;
return -1;
}
const size_t msg_size = static_cast <size_t> (payload_length - 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 (msg_size);
if (rc != 0) {
errno_assert (errno == ENOMEM);
rc = in_progress.init ();
errno_assert (rc == 0);
errno = ENOMEM;
return -1;
}
next_step (tmpbuf, 1, &v1_decoder_t::flags_ready);
return 0;
}
int zmq::v1_decoder_t::flags_ready ()
{
// Store the flags from the wire into the message structure.
in_progress.set_flags (tmpbuf [0] & msg_t::more);
next_step (in_progress.data (), in_progress.size (),
&v1_decoder_t::message_ready);
return 0;
}
int zmq::v1_decoder_t::message_ready ()
{
// Message is completely read. Push it further and start reading
// new message. (in_progress is a 0-byte message after this point.)
next_step (tmpbuf, 1, &v1_decoder_t::one_byte_size_ready);
return 1;
}
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