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From "Christian Marquez Grabia (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Wed, 13 Dec 2017 15:30:00 GMT


Christian Marquez Grabia commented on COMPRESS-380:

[~dawid.weiss] Thanks for the updates. I have created this classes based on different research
on multiple deflate de-compression samples I was able to find using the masking concepts for
the literals / distance tables as well as the state concept, all brought into Java 'style'.

I left it all to jira since this is more about the providing patches to the apache library
I figured it would be applicable mostly to jira users (didn't want to add noise around it)

> 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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