| // Copyright 2022 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| use nom::{bytes, combinator}; |
| |
| /// Nom parser for a `[u8; N]`. |
| pub(crate) fn parse_byte_array<const N: usize>(input: &[u8]) -> nom::IResult<&[u8], [u8; N]> { |
| combinator::map_res(bytes::complete::take(N), |slice: &[u8]| slice.try_into())(input) |
| } |
| |
| #[allow(clippy::unwrap_used)] |
| #[cfg(test)] |
| mod tests { |
| use super::*; |
| |
| #[test] |
| fn parse_empty_array() { |
| assert_eq!(([1_u8, 2, 3].as_slice(), []), parse_byte_array::<0>(&[1, 2, 3]).unwrap()) |
| } |
| |
| #[test] |
| fn parse_nonempty_array() { |
| assert_eq!( |
| ([4_u8, 5, 6].as_slice(), [1, 2, 3]), |
| parse_byte_array::<3>(&[1, 2, 3, 4, 5, 6]).unwrap() |
| ) |
| } |
| } |
