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How do I determine the length of resource forks from MCL?
- To: dmg@goldilocks.LCS.MIT.EDU (David Goodine)
- Subject: How do I determine the length of resource forks from MCL?
- From: Steve Strassmann <firstname.lastname@example.org>
- Date: Tue, 29 Sep 1992 13:51:12 -0500
- Cc: info-mcl
>Date: Mon, 28 Sep 92 18:33:28 EDT
>From: dmg@goldilocks.LCS.MIT.EDU (David Goodine)
>Subject: How do I determine the length of resource forks from MCL?
>I'm trying to find a means of determining the resource fork size of
>files in the Mac filesystem. I've spent some time looking through
>Inside Mac VI, and can't find out where the info is stored. I expect
>that it is somehow accessible through a trap or function call but FInfo,
>DXInfo, et al, fall short.
>Any suggestions would be greatly appreciated, as I'm on a very tight
>deadline. Please respond to me, as I'm not currently on the INFO-MCL
>MIT Spoken Language System Group
I had this code laying around - I can't promise that it'll work
in future releases of MCL, but it seems OK for now..
(defun open-block-readonly (namestring resource-fork-p)
(%fopen namestring 0 $fsRdPerm resource-fork-p))
; Warning, may not work in future releases of MCL!
(defun file-fork-lengths (file)
"Returns two values: the lengths of the data fork
and the resource fork in bytes."
(let ((filename (mac-namestring file))
fblock dsize rsize)
(setf fblock (open-block-readonly filename nil))
(setf dsize (%fsize fblock)))
(setf fblock nil)))
(setf fblock (open-block-readonly filename t))
(setf rsize (%fsize fblock)))
(values dsize rsize)))