RFR: 8260617: Merge ZipFile encoding check with the initial hash calculation [v3]

Tue Feb 2 10:40:02 UTC 2021

On Sun, 31 Jan 2021 18:05:30 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Clarify comments, put normal path branch first in UTF8 checkedHash
>
> Hi Claes
> 
> I gone through your changes a couple of times and with your latest updates, the patch looks good.  We should probably consider looking at Zip FS as its initCEN is similar at a future time.
> 
> Thank you for your efforts to optimize the performance in this area.

Added some comments and refactored slightly after offline feedback from Eirik.

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PR: https://git.openjdk.java.net/jdk/pull/2306