> Those files are compressed by the filesystem. In HFS+/MacOS Extended that
> means that the data fork is empty and the file contents are stored in the
> resource fork or extended attributes structure.
> 
> http://wiki.sleuthkit.org/index.php?title=HFS#HFS.2B_File_Compression

Huh, that's interesting and surprising, thanks for the link. Is this method of 
stashing compressed data in the xattrs something that's currently commonly used 
by OSX? Or is it just some weird infrequently used trick? I see this on the 
linked page:

> Compression is most often used for files installed as part of Mac OS X; user 
> files are typically not compressed (but certainly can be!)

Are a lot of system files compressed like this? Is there any way a user file 
might be compressed in such a way through normal user actions?

~Martin Wierschin


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