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From "Dawid Weiss (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Thu, 26 Jan 2017 10:29:25 GMT


Dawid Weiss commented on COMPRESS-380:

Not necessarily bad wording -- I may be slow in the morning, Stefan, no worries. Indeed, native
ZIP in Java is faster, but it comes with its own quirks, so not everything is rosy. We use
commons-codec as a fallback and I thought DEFLATE64, even though considered a "proprietary"
extension is widespread enough that it'd be nice to have it for completeness. I assume that
if zlib has public sources to decompress it, the lawyers wouldn't get involved... (?).

> Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
> ------------------------------------------------------
>                 Key: COMPRESS-380
>                 URL:
>             Project: Commons Compress
>          Issue Type: New Feature
>            Reporter: Dawid Weiss
> 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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