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https://issues.apache.org/jira/browse/COMPRESS-54?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455845#comment-13455845
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Adam Kunicki commented on COMPRESS-54:
--------------------------------------

http://jponge.github.com/lzma-java/ Seems to have an Apache licensed version of 
the LZMA compression (and streams) based on the original 7z SDK. Could 
incorporate that into commons-compress and then just need to write a compatible 
archiver.
                
> Add 7zip or RAR archive support
> -------------------------------
>
>                 Key: COMPRESS-54
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-54
>             Project: Commons Compress
>          Issue Type: New Feature
>          Components: Archivers
>         Environment: N/A
>            Reporter: Tim Pinet
>            Priority: Minor
>   Original Estimate: 30h
>  Remaining Estimate: 30h
>
> Has anyone looked into adding support for 7zip and RAR file types? Using the 
> j7zip and junrar libraries I was able to get a rough protoype working with 
> commons-compress but only with extract support for RAR (due to licencing 
> issues). Also, my prototype performance is poor so I definately need to 
> improve it.

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