6516099: InputStream.skipFully(int k) to skip exactly k bytes

[Brian Burkhalter]

Hi Daniel,

> On Nov 7, 2018, at 3:49 AM, Daniel Fuchs <daniel.fuchs at oracle.com> wrote:
> 
> I am not sure whether you can trust that a skip implementation
> that returns -1 has actually rewind 1 byte - for instance:
> 
> http://hg.openjdk.java.net/jdk/jdk/file/44f34d2c3243/src/java.desktop/share/classes/com/sun/media/sound/AudioFloatInputStream.java#l99 <http://hg.openjdk.java.net/jdk/jdk/file/44f34d2c3243/src/java.desktop/share/classes/com/sun/media/sound/AudioFloatInputStream.java#l99>

The above class is not a descendent of InputStream. In any case, as InputStream and all its “direct known subclasses” specify that skip() returns “the actual number of bytes skipped” the foregoing behavior would I think be a bug.

> Not sure there's anything that could be done in such cases, except
> encouraging such subclasses to provide their own implementation
> of skipNBytes?

That’s probably true.

Thanks,

Brian