RFR: 8260617: Merge ZipFile encoding check with the initial hash calculation [v4]

[Claes Redestad]

On Tue, 2 Feb 2021 22:55:59 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Refactor out specific ZipException from checkedHash
>
> Thank you for the update Claes, the changes look fine

Thanks @LanceAndersen and @eirbjo for reviewing

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