RFR: 8304020: Speed up test/jdk/java/util/zip/ZipFile/TestTooManyEntries.java and clarify its purpose [v3]

[Eirik Bjorsnos]

On Sun, 12 Mar 2023 14:12:08 GMT, Lance Andersen <lancea at openjdk.org> wrote:

> I think this is probably OK. I would probably create a constant with the Data Size to make it clearer and add more of a detailed comment of this method (laying out the structure of the Extra field) along with pointing to 4.6.1 of the APP.note

I pushed an implementation of this with improved comments, referencing APPNOTE.txt and using more constants where appropriate. I also remembered that ZIP shorts are unsigned, so we can double the size of the extra field for an extra little gain in performance/memory usage.

Take a look at it, I'm sure there is room for improvements in my comments.

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PR: https://git.openjdk.org/jdk/pull/12991