private void ackPacket() {
if (isExpectedBlockAck()) {
if (chunker.hasNextByte()) {
sendNextBlock();
} else {
// no more blocks so close adapter
tftpadapter.close();
}
} else if (isWrapAround()) {
expectedBlock = 0;
if (chunker.hasNextByte()) {
sendNextBlock();
} else {
// no more blocks so close adapter
tftpadapter.close();
}
} else if (isPreviousBlockAck()) {
log.error(
"acknowledgment not for expected block number:"
+ expectedBlock
+ " instead, acknowledgment recieved for block number:"
+ ackpacket.getBlockNumber());
} else if (isGreaterAckThanBlock()) {
log.error("out of order acknowledgment recieved");
} else {
log.error("unexpected problem occured");
tftpadapter.close();
}
}
@Override
protected void onSafePacket(PacketAdapter packet) {
pck = packet;
if (pck.isAckowledgment()) {
ackpacket = (AckPacket) pck;
ackPacket();
} else {
log.error("unexpected packet type recieved");
tftpadapter.close();
}
}
private void sendNextBlock() {
int block = ++expectedBlock;
byte[] bytes;
try {
bytes = chunker.getNext();
sendData(bytes, block);
} catch (IOException e) {
try {
log.error("IOExeption when reading file, sending error packet to client", e);
sendError(UNDEFINED, "IOException");
} catch (IOException e1) {
log.error("IOException could not send error packet to client", e1);
}
tftpadapter.close();
}
}