@Override
public boolean invoke(PacketTuple o, long timestamp) {
int crcInPacket = o.getIntAttribute(crcAttributeName);
DecodedPacket packet = o.getPacket();
int crcPos = phyConfig.CRCpos;
if (!phyConfig.fixedSize) {
crcPos += packet.getByte(phyConfig.lengthPos) + phyConfig.lengthOffset;
}
// check valid packet size
if (crcPos > packet.getLength()) {
return false;
}
int crc = 0xffff;
for (int pos = 0; pos < crcPos; pos++) {
int data = packet.getByte(pos);
data ^= crc & 0xff;
data ^= (data << 4) & 0xff;
crc = (((data << 8) | (crc >> 8)) ^ (data >> 4) ^ (data << 3)) & 0xffff;
}
return (crcInPacket == crc);
}
public void process(Tuple o, int srcID, long timestamp) {
PacketTuple packet = (PacketTuple) o;
int nrElements = packet.getIntAttribute(sizeField);
for (int itemNr = 0; itemNr < nrElements; itemNr++) {
Tuple newTuple = Tuple.createTuple(newType);
for (int i = 0; i < prototype.fieldAttributes.length; i++) {
TupleAttribute aField = prototype.fieldAttributes[i];
if (!aField.equals(sizeField)
&& !aField.equals(arrayField)
&& !aField.equals(tupleTypeID)) {
String path = arrayField.getName() + "[" + itemNr + "]." + aField.getName();
if (((PacketTuple) o).exists(path)) {
newTuple.setAttribute(aField, packet.getAttribute(path));
} else {
newTuple.setAttribute(aField, packet.getAttribute(aField));
}
}
}
transfer(newTuple, timestamp);
}
}
