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From "Stefan Bodewig (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (COMPRESS-101) ZipArchiveInputStream doesn't handle data descriptors without signatures
Date Fri, 12 Mar 2010 15:37:27 GMT

     [ https://issues.apache.org/jira/browse/COMPRESS-101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefan Bodewig resolved COMPRESS-101.
-------------------------------------

    Resolution: Fixed

svn revision 922298 but untested since I've failed to create such an archive so far.

> ZipArchiveInputStream doesn't handle data descriptors without signatures
> ------------------------------------------------------------------------
>
>                 Key: COMPRESS-101
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-101
>             Project: Commons Compress
>          Issue Type: Bug
>    Affects Versions: 1.0
>            Reporter: Stefan Bodewig
>            Assignee: Stefan Bodewig
>             Fix For: 1.1
>
>
> from http://www.pkware.com/documents/casestudies/APPNOTE.TXT :
> {quote}
>       Although not originally assigned a signature, the value 
>       0x08074b50 has commonly been adopted as a signature value 
>       for the data descriptor record.  Implementers should be 
>       aware that ZIP files may be encountered with or without this 
>       signature marking data descriptors and should account for
>       either case when reading ZIP files to ensure compatibility.
>       When writing ZIP files, it is recommended to include the
>       signature value marking the data descriptor record.  When
>       the signature is used, the fields currently defined for
>       the data descriptor record will immediately follow the
>       signature.
> {quote}
> The current code skips over 16 bytes while the descriptor may be using only 12 bytes.

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