I had already researched this recently, here are my notes...
You might want to read "Mac OS X and iOS Internals: To the Apple's Core" By Jonathan Levin
http://ntfs.com/hfs.htmhttp://www.mac4n6.com/snippets:
"In my new SANS FOR518 - Mac Forensic Analysis class I have the students parse by hand certain aspects of an HFS+ file system. "
"FOR518 Reference and HFS+ Reference Sheet" there is a link to PDF, and other resources
"For those that want to learn more about HFS+, I highly recommend the following references:
•Apple Tech Note 1150
•The Sleuth Kit Source
•Mac OS X Internals: A Systems Approach by Amit Singh – Chapter 12
•Mac OS X and iOS Internals: To the Apple’s Core by Jonathan Levin – Chapter 16
•Apple Open Source "
The references in this PDF:
[url]pages.cs.wisc.edu/~legault/miniproj-736.pdf[/url]
That should be enough to keep you going for a while!