XDRInPacketGetDynamic
status_t XDRInPacketGetDynamic (struct XDRInPacket *packet, void *buffer, size_t *_len);
status_t err = XDRInPacketGetDynamic(&reply, buf, &readbytes);
XDRInPacketGetDynamic(&reply, data, &length);
XDRInPacketGetDynamic(reply, body, &bodyLength);