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();
}
}
private boolean isGreaterAckThanBlock() {
return ackpacket.getBlockNumber() > expectedBlock;
}
private boolean isWrapAround() {
return 0 == ackpacket.getBlockNumber();
}
private boolean isPreviousBlockAck() {
return ackpacket.getBlockNumber() < expectedBlock;
}
private boolean isExpectedBlockAck() {
return ackpacket.getBlockNumber() == expectedBlock;
}