int arithmeticCodingValueFromBuffer(const char* checkValue) {
if (((uchar) *checkValue) < 255) {
return *checkValue;
} else {
return 255 + arithmeticCodingValueFromBuffer(checkValue + 1);
}
}
bool packetVersionMatch(const QByteArray& packet) {
// currently this just checks if the version in the packet matches our return from versionForPacketType
// may need to be expanded in the future for types and versions that take > than 1 byte
if (packet[1] == versionForPacketType(packetTypeForPacket(packet)) || packetTypeForPacket(packet) == PacketTypeStunResponse) {
return true;
} else {
PacketType mismatchType = packetTypeForPacket(packet);
int numPacketTypeBytes = arithmeticCodingValueFromBuffer(packet.data());
QUuid nodeUUID;
deconstructPacketHeader(packet, nodeUUID);
qDebug() << "Packet mismatch on" << packetTypeForPacket(packet) << "- Sender"
<< nodeUUID << "sent" << qPrintable(QString::number(packet[numPacketTypeBytes])) << "but"
<< qPrintable(QString::number(versionForPacketType(mismatchType))) << "expected.";
return false;
}
}
PacketType packetTypeForPacket(const char* packet) {
return (PacketType) arithmeticCodingValueFromBuffer(packet);
}
PacketType packetTypeForPacket(const QByteArray& packet) {
return (PacketType) arithmeticCodingValueFromBuffer(packet.data());
}
PacketType::Value Packet::readType() const {
return (PacketType::Value)arithmeticCodingValueFromBuffer(_packet.get());
}