RFR: 8313765: Invalid CEN header (invalid zip64 extra data field size) [v2]

[Eirik Bjorsnos]

On Tue, 15 Aug 2023 15:39:37 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> I think I agree with Volker that it would be better if isZip64ExtBlockSizeValid continued to return false for block size 0.
>
> OK, I have made the suggest change that you both prefer.
> 
> Thank you for your input

I'm also happy to see `isZip64ExtBlockSizeValid` rejecting 0. This logic could be useful when implementing support for valid Zip64 fields for small entries in ZipInputStream, like #12524 attempted to do.  (The PR was closed by the bots in the end). 

I guess this method could be moved to ZipUtils if JDK-8303866 is ever implemented.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15273#discussion_r1296113648