bool NetworkMessage::read_socket()
{
    boost::system::error_code error;
    boost::asio::ip::tcp::socket& s = Connection::instance()->socket;
    m_size = boost::asio::read(s, boost::asio::buffer(buffer(), NETWORKMESSAGE_HEADERSIZE), boost::asio::transfer_all(), error);
    if(error == boost::asio::error::eof)
        return false;
    else if(error)
        throw boost::system::system_error(error);

    quint16 data_size = m_buffer[0] | m_buffer[1] << 8;
    if(m_size != NETWORKMESSAGE_HEADERSIZE || (data_size > NETWORKMESSAGE_MAXSIZE - NETWORKMESSAGE_HEADERSIZE))
        return false;

    m_size += boost::asio::read(s, boost::asio::buffer(body_buffer(NETWORKMESSAGE_HEADERSIZE), data_size), boost::asio::transfer_all(), error);
    if(m_size <= NETWORKMESSAGE_HEADERSIZE || (data_size != m_size - NETWORKMESSAGE_HEADERSIZE))
        return false;

    m_position = NETWORKMESSAGE_HEADERSIZE;
    /* if current version >= 830 */
    quint32 recv_checksum = read<quint32>(true);
    quint32 checksum = calculate_adler(body_buffer(6), m_size - 6);
    if(recv_checksum != checksum)
        return false;

    m_position += sizeof(quint32);
    return true;
}