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

[Andrey Nazarov]

Looks good
> On 13 Feb 2017, at 20:58, Denis Kononenko <denis.kononenko at oracle.com> wrote:
> 
> 
>  Hi,
> 
>  Optimized buffer's capacity checks.
> 
>  WEBREV: http://cr.openjdk.java.net/~dkononenko/8169715/webrev.02 <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.