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From "Stefan Bodewig (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Thu, 26 Jan 2017 09:21:24 GMT

    [ https://issues.apache.org/jira/browse/COMPRESS-380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15839449#comment-15839449
] 

Stefan Bodewig commented on COMPRESS-380:
-----------------------------------------

Of course. I just wanted to leave a pointer for anybody who wants to implement this (which
might even be my future self).

A pure Java DEFLATE64 will certainly be slower than the JNI based DEFLATE built into the JDK
(which we re-use as well).

> 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
>
> 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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