Minor Description
If ArrayInputStream.skip() is called with a large value (like Long.MAX_VALUE) an internal calculation may overflow and cause unexpected results.
It's the line which says
if ((position + count) > end) {
that can overflow. If count (a long) is so big that position + count doesn't fit in a long, the condition will evaluate to false although it should have evaluated to true. Changing the condition to (count > end - position) will fix the problem. Alternatively, we could simplify the entire method body to:
count = Math.min(count, end - position);
position += count;
return count;