/**
* Checks whether there are packets with sequence numbers between <tt>firstSeq</tt> and
* <tt>lastSeq</tt> which are *not* stored in <tt>data</tt>.
*
* @return <tt>true</tt> if there are packets with sequence numbers between <tt>firstSeq</tt> and
* <tt>lastSeq</tt> which are *not* stored in <tt>data</tt>.
*/
private boolean haveMissing() {
Set<Long> seqs = data.keySet();
long s = firstSeq;
while (s != lastSeq) {
if (!seqs.contains(s)) return true;
s = (s + 1) % (1 << 16);
}
return false;
}
