[jira] [Commented] (COMPRESS-380) Support for ENHANCED_DEFLATED (Deflate64) in ZIP files

["Stefan Bodewig (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COMPRESS-380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838117#comment-15838117 ] 

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

Sounds like a good idea.

Anybody who wants to give it a try may benefit from the {{lz77support}} package added after the 1.13 release which should contain most of what is needed for the LZ77 part of DEFLATE64.

> 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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