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From "Stefan Bodewig (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-206) TarArchiveOutputStream sometimes writes garbage beyond the end of the archive
Date Sat, 29 Dec 2012 11:36:12 GMT


Stefan Bodewig commented on COMPRESS-206:

AFAICT the patch addresses COMPRESS-202 in a way but doesn't deal with what you call "garbage"
written at the end.  Does TarArchiveOutputStream still write garbage or did you only think
it would because input stream didn't read the EOF block(s)?
> TarArchiveOutputStream sometimes writes garbage beyond the end of the archive
> -----------------------------------------------------------------------------
>                 Key: COMPRESS-206
>                 URL:
>             Project: Commons Compress
>          Issue Type: Bug
>          Components: Compressors
>    Affects Versions: 1.0, 1.4.1
>         Environment: Linux x86
>            Reporter: Peter De Maeyer
>             Fix For: 1.5
>         Attachments: COMPRESS-206.patch
> For some combinations of file lengths, the archive created by TarArchiveOutputStream
writes garbage beyond the end of the TAR stream. TarArchiveInputStream can still read the
stream without problems, but it does not read beyond the garbage. This is problematic for
my use case because I write a checksum _after_ the TAR content. If I then try to read the
checksum back, I read garbage instead.
> Functional impact:
> * TarArchiveInputStream is asymmetrical with respect to TarArchiveOutputStream, in the
sense that TarArchiveInputStream does not read everything that was written by TarArchiveOutputStream.
> * The content is unnecessarily large. The garbage is totally unnecessarily large: ~10K
overhead compared to Linux command-line tar.
> This symptom is remarkably similar to #COMPRESS-81, which is supposedly fixed since 1.1.
Except for the fact that this issue still exists... I've tested this with 1.0 and 1.4.1.

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