void Packet::writePacketTypeAndVersion(PacketType::Value type) {
// Pack the packet type
auto offset = packArithmeticallyCodedValue(type, _packet.get());
// Pack the packet version
auto version = versionForPacketType(type);
memcpy(_packet.get() + offset, &version, sizeof(version));
}
int packArithmeticallyCodedValue(int value, char* destination) {
if (value < 255) {
// less than 255, just pack our value
destination[0] = (uchar) value;
return 1;
} else {
// pack 255 and then recursively pack on
((unsigned char*)destination)[0] = 255;
return 1 + packArithmeticallyCodedValue(value - 255, destination + 1);
}
}
int populatePacketHeader(char* packet, PacketType type, const QUuid& connectionUUID) {
int numTypeBytes = packArithmeticallyCodedValue(type, packet);
packet[numTypeBytes] = versionForPacketType(type);
QUuid packUUID = connectionUUID.isNull() ? NodeList::getInstance()->getOwnerUUID() : connectionUUID;
QByteArray rfcUUID = packUUID.toRfc4122();
memcpy(packet + numTypeBytes + sizeof(PacketVersion), rfcUUID.constData(), NUM_BYTES_RFC4122_UUID);
// return the number of bytes written for pointer pushing
return numTypeBytes + sizeof(PacketVersion) + NUM_BYTES_RFC4122_UUID;
}
int populatePacketHeader(char* packet, PacketType type, const QUuid& connectionUUID) {
int numTypeBytes = packArithmeticallyCodedValue(type, packet);
packet[numTypeBytes] = versionForPacketType(type);
char* position = packet + numTypeBytes + sizeof(PacketVersion);
QUuid packUUID = connectionUUID.isNull() ? NodeList::getInstance()->getSessionUUID() : connectionUUID;
QByteArray rfcUUID = packUUID.toRfc4122();
memcpy(position, rfcUUID.constData(), NUM_BYTES_RFC4122_UUID);
position += NUM_BYTES_RFC4122_UUID;
// pack 16 bytes of zeros where the md5 hash will be placed one data is packed
memset(position, 0, NUM_BYTES_MD5_HASH);
position += NUM_BYTES_MD5_HASH;
// return the number of bytes written for pointer pushing
return position - packet;
}