IOException with alias

[dream7prod]

When we try to compress a folder with alias in it, an IOException (21) occurs.
The same with any archive format.
It would be great if the archiver could handle alias files as many Applications folder have Frameworks and have several alias in them.

If we make an archive with external archiver that handles aliases and unarchive it with RB-zlib the aliases are juste empty files that doesn't work.

[charonn0]

Aliases aren't supported by the official ZIP spec, so it's probably an Apple-specific extension to the format. I don't have a Mac to test on; can you upload an example zip archive containing alias files for me to look at?

[dream7prod]

Here is a zip archive with an alias to a file and an alias to a folder.
Thanks.
Archive.zip

[charonn0]

Sorry for the delay in getting back to this. It appears that Apple stores the alias in the "external attributes" section of the zip table of contents. This will make it difficult to add support for extracting them since we pretty much ignore the table of contents when extracting. I'll have to think about it some more.