RFR: 8377992: (zipfs) Align ZipFileSystem END header validation with the ZipFile implementation

[Eirik Bjørsnøs]

On Thu, 19 Feb 2026 16:04:34 GMT, Lance Andersen <lancea at openjdk.org> wrote:

> WRT the test, it is preferable that the ZipFS tests are added to open/test/jdk/jdk/nio/zipfs for now so that we have the specific tests co-located.

The existing `EndOfCenValidation` test goes through  some heroic efforts to create ZIP/ZIP64 files under reasonable size and efficiency constraints that provokes these edge-cases being tested. 

The reason I opted to expand the existing test with support for verifying `ZipFileSystem` was based on the following observations:

* We want to ensure that validation for these cases is equivalent across APIs
* Co-locating them avoids duplication of good amounts of intricate setup of test vectors

Did you mean that we should copy this tests and maintain the copy separately in the `zipfs` area?

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PR Comment: https://git.openjdk.org/jdk/pull/29747#issuecomment-3928397967