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https://issues.apache.org/jira/browse/COMPRESS-65?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebb resolved COMPRESS-65.
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Resolution: Fixed
The match method now works for Posix and GNU.
> TarArchiveInputStream.matches() only works for tar archives whose first file
> is "test1.xml"
> -------------------------------------------------------------------------------------------
>
> Key: COMPRESS-65
> URL: https://issues.apache.org/jira/browse/COMPRESS-65
> Project: Commons Compress
> Issue Type: Bug
> Reporter: Sebb
>
> The tar header format does not have a "magic" number at the start, so in
> general it is impossible to tell if an input file is a tar file without
> reading a lot more data.
> The current match() implementation assumes the first 8 bytes contain
> "test1.xml", which is obviously a hack for testing purposes.
> If more bytes are read from the input, it might be possible to implement a
> working match() method:
> The file must be at least 512 bytes long.
> The following offsets have contents that could be checked:
> Offset len
> 148 8 Checksum for header block
> 156 1 Link indicator (file type) - '0'-'6' or null
> Other possible checks are:
> - numeric fields must be octal
> - filename fields must end in trailing nulls (but can a filename contain a
> null?)
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