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From "Stefan Schlott (Jira)" <j...@apache.org>
Subject [jira] [Created] (COMPRESS-497) Handle missing offset to end header in 7z
Date Mon, 28 Oct 2019 20:20:00 GMT
Stefan Schlott created COMPRESS-497:
---------------------------------------

             Summary: Handle missing offset to end header in 7z
                 Key: COMPRESS-497
                 URL: https://issues.apache.org/jira/browse/COMPRESS-497
             Project: Commons Compress
          Issue Type: Improvement
          Components: Archivers
            Reporter: Stefan Schlott


When dealing with multipart 7z files, it may occur that the start header is invalid (all zeros)
- see [https://www.7-zip.org/recover.html], section "There is no correct End Header at the
end of archive". This can happen if the first part of the file is moved while the overall
operation hasn't finished yet (the start header is written as very last step).

Detect a missing start header (all bytes are zero) and try to guess the end header.



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