[COMPRESS-514] SevenZFile fails with encoded header over 2GiB

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 1.20
• Component/s: Archivers
• Assignee: Unassigned
• Reporter: A Kelday
• Created: 08/May/20 19:37
• Updated: 06/May/22 15:07

Description

When reading what some may call a large encrypted 7zip file (1.2TB with 22 million files), the read fails at the header stage with the trace below. Is this within the spec? I've written some code to handle it, because I did actually need to extract the file in java. If that's of any use I can provide it (it's a naive wrapper that just pages in a buffer at a time).

 

Exception in thread "main" java.io.IOException: Cannot handle unpackSize2416988886
at org.apache.commons.compress.archivers.sevenz.SevenZFile.assertFitsIntoInt(SevenZFile.java:1523)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.readEncodedHeader(SevenZFile.java:622)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.initializeArchive(SevenZFile.java:532)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.readHeaders(SevenZFile.java:468)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:337)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:129)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:116)

7zip itself can also open it (and display/extract etc.), here are the stats:

 

 

Size: 2 489 903 580 875
Packed Size: 1 349 110 308 832
Folders: 40 005
Files: 22 073 957
CRC: E26F6A96

Issue Links

• relates to: COMPRESS-619 Large SevenZFile fails When Next Header Size is Greater than Max Int