Separate file reading from Foundation

[Joannis]

File is dependent on Foundation file reading which is blocking and dependent on this line of code which as of today is known to cause infinite loops on 0 length files

[vzsg]

Zero-byte files are not the issue, but reading virtual files (like procfs, sysfs) where stat returns an arbitrary file size (typ. 4096), but read can only read a few bytes before EOF. That Foundation function doesn't handle premature EOF at all.