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https://issues.apache.org/jira/browse/COMPRESS-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13071536#comment-13071536
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Patrick Dreyer edited comment on COMPRESS-124 at 7/27/11 6:01 AM:
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I absolutely agree with overwriting {{canReadEntryData()}} instead having 
{{isGNUSparse()}}.

Looking at the commits, we still have no unit tests, right?

      was (Author: patrickdreyer):
    I absolutely agree with overwriting {{canReadEntryData()}} instead having 
{{isGNUSparse()}}.

Looking at the commits, we still have no unit tests, right?
And, Stefan, you mentioned the commit of a tar archive using the oldgnu format, 
but where is it?
  
> Unable to extract a TAR file that contains sparse entries
> ---------------------------------------------------------
>
>                 Key: COMPRESS-124
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-124
>             Project: Commons Compress
>          Issue Type: New Feature
>          Components: Archivers
>    Affects Versions: 1.1, 1.2
>         Environment: Platform independent. However, I'm currently using 
> Window 7 Enterprise.
>            Reporter: Patrick Dreyer
>         Attachments: gnuSparseFile.patch
>
>
> Good news first: I already have the patch ready for that.
> I got several TAR files which I could not extract with any of the existing 
> Java implementations, but I could extract all those TAR files successfully 
> with GNU tar.
> It turned out that all the failing TAR files contained so called sparse 
> files. Investigating the source code of all existing Java TAR implementations 
> showed me that none of them even recognizes the existence of GNU sparse 
> entries.
> Actually, I don't need to process one of the contained sparse files and I'm 
> happy if I'm at least able to correctly untar all the non-sparsed files. 
> Thus, it would be sufficient recognizing sparse files without the need to 
> correctly un-sparse them while extracting. As long as all non-sparsed files 
> get extracted correctly, I'm fine.
> The TAR files in question have all been VMware Diagnostic File bundles.
> See 
> http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=653
>  to know how to get them.

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