[9] RFR: 8169715: jimage fails with IAE when attempts to inspect an empty file

[Denis Kononenko]

  Hi,

  Optimized buffer's capacity checks.

  WEBREV: http://cr.openjdk.java.net/~dkononenko/8169715/webrev.02

> 
> Could please someone review the fix for JDK-8169715.
>   
> The problem occurs when jimage tool is attempting to read an empty or
> incomplete image. The current implementation works with ByteBuffer and
> always relies on that there's enough data to inspect the image. This
> results in IAE inside of BasicImageReader.slice method when the buffer
> is smaller then it's expected.
> 
> I added a few checks to avoid IAE and throw IOException with a more
> descriptive text.
> 
> 
>   BUGURL: https://bugs.openjdk.java.net/browse/JDK-8169715
>   WEBREV: http://cr.openjdk.java.net/~dkononenko/8169715/webrev.01
> 
>   Thank you,
>   Denis.

Thank you,
Denis.