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Determining file permissions



How do I determine the access permissions for a file?  The headers
indicate that FSCatalogInfo has a field called "permissions", that for
a file on an HFS+ disk will return the POSIX permissions for the file,
but how do I get from that to an answer to "can I read that file?"

Also, what about other situations, such as:
 - A file on a FAT-12 floppy disk?  What if the disk is locked?
 - A file on a Windows file server?
 - A file on an HFS disk?
 - A file on a CD-ROM?

Thanks,
Mark Wagner
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