How to create a new file with existing file's resource fork?

I would like to create a new file that has the resource fork of an existing file. I had though of making a copy of the existing file, seek to the beginning of the copy and write the new data, but for large files, that creates the whole file even when not needed. I currently create the new file with [NSFileManager createFileAtPath: contents: attributes:], but attributes do not include resource fork items, like custom icons, color label, etc.
[NSURL resourceValuesForKeys] gives a common subset of resource data, like icons and color label, but that's about it. Is there some way to get the resource fork or a copy of the file without getting the whole file?

What are you trying to do here? While resource forks might still be quasi-supported, you really shouldn't be thinking about them as such. Instead, think in terms of extended attributes. You can use the low-level xattr() functions to get some of that or you can use the new NSURL methods.

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