zmq_decoder.cpp

/*
    Copyright (c) 2007-2009 FastMQ Inc.

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the Lesser GNU 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
    Lesser GNU General Public License for more details.

    You should have received a copy of the Lesser GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "zmq_decoder.hpp"
#include "i_inout.hpp"
#include "wire.hpp"

zmq::zmq_decoder_t::zmq_decoder_t () :
    destination (NULL)
{
    zmq_msg_init (&in_progress);

    //  At the beginning, read one byte and go to one_byte_size_ready state.
    next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
}

zmq::zmq_decoder_t::~zmq_decoder_t ()
{
    zmq_msg_close (&in_progress);
}

void zmq::zmq_decoder_t::set_inout (i_inout *destination_)
{
    destination = destination_;
}

bool zmq::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, &zmq_decoder_t::eight_byte_size_ready);
    else {
        zmq_msg_init_size (&in_progress, *tmpbuf);
        next_step (zmq_msg_data (&in_progress), *tmpbuf,
            &zmq_decoder_t::message_ready);
    }
    return true;
}

bool zmq::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);
    zmq_msg_init_size (&in_progress, size);
    next_step (zmq_msg_data (&in_progress), size,
        &zmq_decoder_t::message_ready);
    return true;
}

bool zmq::zmq_decoder_t::message_ready ()
{
    //  Message is completely read. Push it further and start reading
    //  new message.
    if (!destination->write (&in_progress))
        return false;

    next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
    return true;
}