Livia Sarbu created COMPRESS-252:
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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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