UTF-16

Work with UTF-16 in Rust.

Differences to other crates

• utf16string - realhydroper-utf16 uses code units as u16 instead of octets for indexing strings, as opposed to utf16string.

Converting offsets between UTF-8 and UTF-16

Use the utils submodule for converting between offset encodings:

use realhydroper_utf16::{Utf16String, utils::*};

let utf8string = "a\u{10FFFF}b\u{10000}";
let utf16string = Utf16String::from(utf8string);

// (start: usize, end: usize)
assert_eq!(two_utf16_offsets_as_utf8_offsets(utf8string, &utf16string, 3, 4), (5, 6));
assert_eq!(two_utf8_offsets_as_utf16_offsets(&utf16string, utf8string, 5, 6), (3, 4));