typedef bool (*SilcPacketParserCallback)(SilcPacketParserContext 
                                             *parse_context);

    This callback is given to the silc_packet_receive_process function.
    The callback is called by the library every time a packet is
    received from the network. After the packet has been decrypted
    and at least partially parsed it is passed to the application
    for further parsing using this callback and the SilcPacketParserContext
    context. The application receiving the SilcPacketParserContext
    must free it.

    This returns TRUE if the library should continue packet processing
    (assuming there is more data to be processed), and FALSE if the
    upper layer does not want the library to continue but to leave the
    rest of the data is the packet queue untouched.  Application may
    want to do this for example if the cipher is not ready before 
    processing a certain packet.  In this case the application wants
    to recall the processing function with the correct cipher.