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https://issues.apache.org/jira/browse/COMPRESS-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12901592#action_12901592
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Leo Izen commented on COMPRESS-91:
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I tried this myself. If JarArchiveInputStream is before ZipArchiveInputStream,
then when you open a file that is .zip but not .jar, it will return
JarArchiveInputStream. There is no way to tell the difference between a jar and
a zip file without looking at file extension.
> jar recognition is curently impossible.
> ---------------------------------------
>
> Key: COMPRESS-91
> URL: https://issues.apache.org/jira/browse/COMPRESS-91
> Project: Commons Compress
> Issue Type: Bug
> Affects Versions: 1.0
> Environment: W2K and unbuntu JRE1.4 to 1.6.
> Reporter: Torelli
> Priority: Minor
>
> In ArchiveStreamFactory.createArchiveInputStream(final InputStream in),
> JarArchiveInputStream must be before ZipArchiveInputStream
> and a positive jar identification have to be confirmed by the first file
> entry (META-INF/MANIFEST.MF).
> Regards.
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