SilcArgumentPayload
    silc_argument_payload_parse(const unsigned char *payload,
                                SilcUInt32 payload_len,
                                SilcUInt32 argc);

    Parses arguments and returns them into Argument Payload structure.
    the `buffer' is raw Argument Payload data buffer. The `argc' is
    the number of arguments in the Argument Payload. The caller must
    know the number of the arguments. This is always known as the
    Argument payload is associated with other payloads which defines
    the number of the arguments.