[COMPRESS-45] ZipExtraFields need data from central directory as well

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0
• Assignee: Stefan Bodewig
• Reporter: Stefan Bodewig
• Created: 26/Feb/09 13:26
• Updated: 24/Mar/09 05:09
• Resolved: 03/Mar/09 12:42

Description

Extra field data can be stored in two places inside a zip archive - the entries local file data and its central directory entry.

Currently ZipFile - like java.util.zip.* - ignores the data stored inside the central directory and assumes all information can be taken from the local file data part.

Unfortunately there are cases where an archiver uses different data, or even worse, only uses the central directory. One such case comes up with SANDBOX-176 and WinZIP. WinZIP uses InfoZIP extra fields to store Unicode versions of file names but it only stores them inside the central directory, where ZipFile doesn't look for them.