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From "Stefan Bodewig (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files
Date Tue, 09 Jan 2018 09:19:00 GMT


Stefan Bodewig commented on COMPRESS-380:

It is good that we've got an implementation that seems to work OK by now, performance can
certainly be improved later. Some of the current implementation could be augmented by stuff
I've done in the LZ77 package.

Yes, I've also seen treating the stored blocks as bitstreams as something that should be possible
to improve, I will give it a try before I merge the branch to master. After that I'd likely
want to cut a release and spend time on improving performance in subsequent updates.

> 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,, input2
> 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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