Make the fuchsia mojo/public repo the source of truth.

mojo/public/rust/src/bindings/util.rs

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-//! This module contains some useful functions for encoding.
-
-/// Given some size value, the size is aligned to some number in bytes.
-///
-/// Neither the size nor bytes may be zero (those are always aligned) and
-/// bytes must be a power of two (other alignments don't make sense).
-pub fn align_bytes(size: usize, bytes: usize) -> usize {
-    debug_assert!(bytes != 0);
-    debug_assert!((bytes & (!bytes + 1)) == bytes);
-    (size + bytes - 1) & (!(bytes - 1))
-}
-
-/// Converts some number of bits into however many bytes are needed to
-/// represent that bit size.
-pub fn bits_to_bytes(bits: usize) -> usize {
-    ((bits + 7) >> 3)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::align_bytes;
-    use super::bits_to_bytes;
-
-    #[test]
-    fn check_align_bytes() {
-        assert_eq!(align_bytes(12, 8), 16);
-        assert_eq!(align_bytes(16, 4), 16);
-        assert_eq!(align_bytes(1, 1), 1);
-    }
-
-    #[test]
-    #[should_panic]
-    fn check_bad_align_bytes() {
-        assert_eq!(align_bytes(15, 7), 21);
-        assert_eq!(align_bytes(2, 0), 0);
-    }
-
-    #[test]
-    fn check_bits_to_bytes() {
-        assert_eq!(bits_to_bytes(8), 1);
-        assert_eq!(bits_to_bytes(0), 0);
-        assert_eq!(bits_to_bytes(1), 1);
-        assert_eq!(bits_to_bytes(21), 3);
-    }
-}