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/*
Copyright (c) 2007-2011 iMatix Corporation
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 <stdlib.h>
#include <string.h>
#include "decoder.hpp"
#include "i_inout.hpp"
#include "wire.hpp"
#include "err.hpp"
zmq::decoder_t::decoder_t (size_t bufsize_, int64_t maxmsgsize_) :
decoder_base_t <decoder_t> (bufsize_),
destination (NULL),
maxmsgsize (maxmsgsize_)
{
zmq_msg_init (&in_progress);
// At the beginning, read one byte and go to one_byte_size_ready state.
next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
}
zmq::decoder_t::~decoder_t ()
{
zmq_msg_close (&in_progress);
}
void zmq::decoder_t::set_inout (i_inout *destination_)
{
destination = destination_;
}
bool zmq::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, &decoder_t::eight_byte_size_ready);
else {
// There has to be at least one byte (the flags) in the message).
if (!*tmpbuf) {
decoding_error ();
return false;
}
// 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;
if (maxmsgsize >= 0 && (int64_t) (*tmpbuf - 1) > maxmsgsize) {
rc = -1;
errno = ENOMEM;
}
else
rc = zmq_msg_init_size (&in_progress, *tmpbuf - 1);
if (rc != 0 && errno == ENOMEM) {
rc = zmq_msg_init (&in_progress);
errno_assert (rc == 0);
decoding_error ();
return false;
}
errno_assert (rc == 0);
next_step (tmpbuf, 1, &decoder_t::flags_ready);
}
return true;
}
bool zmq::decoder_t::eight_byte_size_ready ()
{
// 8-byte size is read. Allocate the buffer for message body and
// read the message data into it.
size_t size = (size_t) get_uint64 (tmpbuf);
// There has to be at least one byte (the flags) in the message).
if (!size) {
decoding_error ();
return false;
}
// 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;
if (maxmsgsize >= 0 && (int64_t) (size - 1) > maxmsgsize) {
rc = -1;
errno = ENOMEM;
}
else
rc = zmq_msg_init_size (&in_progress, size - 1);
if (rc != 0 && errno == ENOMEM) {
rc = zmq_msg_init (&in_progress);
errno_assert (rc == 0);
decoding_error ();
return false;
}
errno_assert (rc == 0);
next_step (tmpbuf, 1, &decoder_t::flags_ready);
return true;
}
bool zmq::decoder_t::flags_ready ()
{
// Store the flags from the wire into the message structure.
in_progress.flags = tmpbuf [0];
next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
&decoder_t::message_ready);
return true;
}
bool zmq::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.)
if (!destination || !destination->write (&in_progress))
return false;
next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
return true;
}
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