Function hurray_descriptor_byte_offset 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn hurray_descriptor_byte_offset(
    handle: *const HurrayDescriptor,
    out_offset: *mut u64,
) -> HurrayStatus

Reads the byte offset from the start of buffer 0 to logical element [0,…,0].

Safety

handle and out_offset MUST be valid, non-null pointers.