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88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/*
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Copyright (c) 2007-2009 FastMQ Inc.
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "zmq_decoder.hpp"
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#include "i_inout.hpp"
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#include "wire.hpp"
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#include "err.hpp"
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zmq::zmq_decoder_t::zmq_decoder_t () :
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destination (NULL)
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{
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zmq_msg_init (&in_progress);
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// At the beginning, read one byte and go to one_byte_size_ready state.
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next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
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}
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zmq::zmq_decoder_t::~zmq_decoder_t ()
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{
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zmq_msg_close (&in_progress);
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}
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void zmq::zmq_decoder_t::set_inout (i_inout *destination_)
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{
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destination = destination_;
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}
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bool zmq::zmq_decoder_t::one_byte_size_ready ()
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{
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// First byte of size is read. If it is 0xff read 8-byte size.
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// Otherwise allocate the buffer for message data and read the
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// message data into it.
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if (*tmpbuf == 0xff)
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next_step (tmpbuf, 8, &zmq_decoder_t::eight_byte_size_ready);
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else {
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// TODO: Handle over-sized message decently.
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int rc = zmq_msg_init_size (&in_progress, *tmpbuf);
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errno_assert (rc == 0);
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next_step (zmq_msg_data (&in_progress), *tmpbuf,
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&zmq_decoder_t::message_ready);
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}
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return true;
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}
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bool zmq::zmq_decoder_t::eight_byte_size_ready ()
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{
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// 8-byte size is read. Allocate the buffer for message body and
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// read the message data into it.
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size_t size = (size_t) get_uint64 (tmpbuf);
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// TODO: Handle over-sized message decently.
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int rc = zmq_msg_init_size (&in_progress, size);
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errno_assert (rc == 0);
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next_step (zmq_msg_data (&in_progress), size,
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&zmq_decoder_t::message_ready);
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return true;
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}
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bool zmq::zmq_decoder_t::message_ready ()
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{
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// Message is completely read. Push it further and start reading
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// new message.
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if (!destination || !destination->write (&in_progress))
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return false;
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next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
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return true;
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}
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