[jira] [Work logged] (COMPRESS-497) Handle missing offset to end header in 7z

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COMPRESS-497?focusedWorklogId=335158&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-335158 ]

ASF GitHub Bot logged work on COMPRESS-497:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 28/Oct/19 20:21
            Start Date: 28/Oct/19 20:21
    Worklog Time Spent: 10m 
      Work Description: Skyr commented on pull request #85: COMPRESS-497 Handle missing endheader offset
URL: https://github.com/apache/commons-compress/pull/85
 
 
   Detect incomplete header (all zero bytes)
   Try to guess end header by trying to parse the file at the end
 
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 335158)
    Remaining Estimate: 0h
            Time Spent: 10m

> 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
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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