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From "Stefan Bodewig (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Thu, 28 Dec 2017 09:17:03 GMT


Stefan Bodewig commented on COMPRESS-380:

@chalmagr84 many thanks. I'm still comparing your code with the one in zlib and not completely
through. This looks really good.

I'd probably change the package name from to compressors.deflate64 (and
maybe add a standalone {{CompressorInputStream}} as well) - and certainly add the license
headers and some javadocs. I can do all of these steps myself unless you want to update the

> Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
> ------------------------------------------------------
>                 Key: COMPRESS-380
>                 URL:
>             Project: Commons Compress
>          Issue Type: New Feature
>            Reporter: Dawid Weiss
>             Fix For: 1.16
>         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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