Function hex_check 

pub fn hex_check(src: &[u8]) -> bool

Returns whether every byte is an ASCII hex digit, accepting either letter case.

Accepts 0 through 9, a through f, and A through F, including mixed case. Prefixes, whitespace and non-ASCII bytes are rejected. This is a character-only check: empty and odd-length inputs can pass. It does not allocate or modify the input.

Use hex_decode to also require complete byte pairs. There is no need to call this function before a checked decoder: decoding already validates input.

Examples

use faster_hex::hex_check;

assert!(hex_check(b"00aBcD"));
assert!(hex_check(b"a")); // Valid characters, but not a complete byte pair.
assert!(hex_check(b""));
assert!(!hex_check(b"0x01"));
assert!(!hex_check(b"00 01"));