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From "Livia Sarbu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COMPRESS-252) Writing 7z empty entries with LZMA2 produces incorrect or corrupt archive
Date Wed, 18 Dec 2013 16:14:07 GMT
Livia Sarbu created COMPRESS-252:
------------------------------------

             Summary: Writing 7z empty entries with LZMA2 produces incorrect or corrupt archive
                 Key: COMPRESS-252
                 URL: https://issues.apache.org/jira/browse/COMPRESS-252
             Project: Commons Compress
          Issue Type: Bug
          Components: Archivers
    Affects Versions: 1.6
         Environment: eclipse 3.7.2, java 1.7
            Reporter: Livia Sarbu
            Priority: Blocker


I couldn't find an exact rule that causes this incorrect behavior, but I tried to reduce it
to some simple scenarios to reproduce it:

Input: A folder with certain files -> tried to archive it.
If the folder contains more than 7 files the incorrect behavior appears.

Scenario 1: 7 empty files
Result: The created archive contains a single folder entry with the name of the archive (no
matter which was the name of the file)

Scenario 2: 7 files, some empty, some with content
Result: The created archive contains a folder entry with the name of the archive and a number
of file entries also with the name of the archive. The number of the entries is equal to the
number of non empty files.

Scenario 3: 8 empty files
Result: 7zip Manager cannot open archive and stops working.

Scanario 4.1: 8 files: some empty, some with content, last file (alphabetically) with content
Result: same behavior as described for Scenario 2.

Scanario 4.2: 8 files, some empty, some with content, last file empy
Result: archive is corrupt, the following message is received: "Cannot open file 'archivename.7z'
as archive" (7Zip Manager does not crash).

I can provide the test class & project used if it is helpful.



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