| // Copyright 2021 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /// Round `offset` up to next multiple of `block_size`. |
| /// This function will fail if rounding up leads to an integer overflow. |
| /// |
| /// (Note that unstable rust is currently adding the same function |
| /// `{integer}::checked_next_multiple_of()` behind the "int_roundings" feature.) |
| pub fn round_up<T: Into<u64>>(offset: u64, block_size: T) -> Option<u64> { |
| let block_size = block_size.into(); |
| Some(round_down(offset.checked_add(block_size - 1)?, block_size)) |
| } |
| |
| /// Round `offset` down to the previous multiple of `block_size`. |
| pub fn round_down<T: Into<u64>>(offset: u64, block_size: T) -> u64 { |
| let block_size = block_size.into(); |
| offset - offset % block_size |
| } |
