On 29/04/2008, at 2:58 AM, Aaron Burghardt wrote:
When I learned of it, roughly in the timeframe of Jaguar or Panther, there was a document with a title like "Mac OS X System Overview", or something similar--I think that it where I read about it. I'm sure it was documented in somewhere in Apple's developer documentation, but it apparently it has been removed.Given the current lack of documentation, I agree with Jean-Daniel Dupas that I would avoid it unless actually required.
I personally wouldn't be too worried about using it. There are enough references around to suggest that it's here to stay and whilst it's not definitive, the kernel sources don't have comments to suggest that it's going to be deprecated like "<file>/rsrc" is. If they did deprecate it they'd have the issue of dealing with other file-systems that might be using that pattern (for example NTFS implementations might use it to access named streams). I guess if you wanted to be sure, you could contact DTS.
Going back to the original question, there's another API that's worth considering that I don't think has been mentioned: getattrlist. ATTR_FILE_TOTALSIZE will give you the total number of bytes used by all of the file's forks. ATTR_FILE_ALLOCSIZE will give you the physical size (which includes the spare space used for padding). I'm not sure what the application of this information is for, but if it's for seeing if files will fit somewhere, it's a bit difficult to get an exact figure because there's the additional space that might be required in metadata files so care should be taken with how this information is used.
- Chris
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