RFR: 8314891: Additional Zip64 extra header validation

[Andrey Turbanov]

On Sat, 9 Sep 2023 14:33:53 GMT, Lance Andersen <lancea at openjdk.org> wrote:

> Please review this PR which improves the Zip64 extra header validation:
> 
> - Throw a ZipException If the extra len field is 0 and :
> -- size, csize, or loc offset are set to 0xFFFFFFFF
> -- disk starting number is set to 0xFFFF
> 
> - We have a valid size for the Zip64 extra header but we are missing the csize or loc fields if they are expected to be part of the header
> 
> Mach5 tiers 1-3 are clean

test/jdk/java/util/zip/ZipFile/MissingZIP64EntriesTest.java line 198:

> 196:      * actual value is stored in the Zip64 Extra Header
> 197:      */
> 198:     private static final int  ZIP64_MAGICCOUNT = 0xFFFF;

Suggestion:

    private static final int ZIP64_MAGICCOUNT = 0xFFFF;

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PR Review Comment: https://git.openjdk.org/jdk/pull/15650#discussion_r1322670868