Function byte::check_len

pub fn check_len(bytes: &[u8], len: usize) -> Result<usize>

A shorthand function to check whether the given length exceeded the length of slice; return Err(Error::Incomplete) if not.

Usually used in implementation of TryRead and TryWrite.

Example

use byte::*;

let bytes = [0u8; 4];
assert_eq!(check_len(&bytes, 4), Ok(4));
assert_eq!(check_len(&bytes, 5), Err(Error::Incomplete));