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From "Dawid Weiss (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Tue, 12 Dec 2017 18:35:00 GMT


Dawid Weiss commented on COMPRESS-380:

I'm not a committer, but I looked at the patch and while I didn't verify its correctness I
think it's overall looking very neat -- congratulations. Stefan may correct me, but I think
you'll need to add Apache headers to source files if you'd like this to be merged in. Are
those classes all authored by you (they're looking awfully nice)!?

Also, is there any reason your comments are not visible to the world? It'll look strange to
non-jira users to just see our replies.

> Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
> ------------------------------------------------------
>                 Key: COMPRESS-380
>                 URL:
>             Project: Commons Compress
>          Issue Type: New Feature
>            Reporter: Dawid Weiss
>         Attachments: compress-380.diff
> Some of the (large) ZIP files we try to process currently will throw this:
> {code}
> UnsupportedZipFeatureException: unsupported feature method 'ENHANCED_DEFLATED' 
> {code}
> which is a bummer since JDK's implementation also doesn't support Deflate64. This seems
to be PKWare's extensions, although code to decrypt it exists in zlib (and is appropriately
licensed, I believe).

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