Uppercase hexadecimal encoding

This encoding is a static version of:

# use data_encoding::{Specification, HEXUPPER};
let mut spec = Specification::new();
spec.symbols.push_str("0123456789ABCDEF");
assert_eq!(HEXUPPER, spec.encoding().unwrap());

It is compliant with RFC4648 and known as "base16" or "hex".

Examples

use data_encoding::HEXUPPER;
let deadbeef = vec![0xde, 0xad, 0xbe, 0xef];
assert_eq!(HEXUPPER.decode(b"DEADBEEF").unwrap(), deadbeef);
assert_eq!(HEXUPPER.encode(&deadbeef), "DEADBEEF");