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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Thu, 28 Dec 2017 09:15:00 GMT

     [ https://issues.apache.org/jira/browse/COMPRESS-380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dawid Weiss updated COMPRESS-380:
---------------------------------
    Attachment: archive-deflate.zip
                archive-deflate64.zip
                hello.world

Hi Stefan. {{hello.world}} compressed with {{7za}}; deflate and deflate64 versions attached.
I see the binary dump does show a different compression method being used, although the compressed
stream seems to be identical.

I can run some randomized regression tests once we have a patch in place.

> Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
> ------------------------------------------------------
>
>                 Key: COMPRESS-380
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-380
>             Project: Commons Compress
>          Issue Type: New Feature
>            Reporter: Dawid Weiss
>             Fix For: 1.16
>
>         Attachments: archive-deflate.zip, archive-deflate64.zip, compress-380.diff, hello.world
>
>
> 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).
> https://github.com/madler/zlib/tree/master/contrib/infback9



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