Function CFURLCreateAbsoluteURLWithBytes 

pub unsafe extern "C" fn CFURLCreateAbsoluteURLWithBytes(
    alloc: CFAllocatorRef,
    relativeURLBytes: *const UInt8,
    length: CFIndex,
    encoding: CFStringEncoding,
    baseURL: CFURLRef,
    useCompatibilityMode: Boolean,
) -> CFURLRef

Apple SDK function CFURLCreateAbsoluteURLWithBytes.