Move base24 into identity crate since that is the only place it is used.

src/base24.rs

@@ -1,53 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at https://mozilla.org/MPL/2.0/.
- *
- * (c) ZeroTier, Inc.
- * https://www.zerotier.com/
- */
-
-use crate::error::InvalidParameterError;
-
-/// All unambiguous letters, thus easy to type on the alphabetic keyboards on phones without extra shift taps.
-/// The letters 'l' and 'u' are skipped.
-const BASE24_ALPHABET: [u8; 24] = [
-    b'a', b'b', b'c', b'd', b'e', b'f', b'g', b'h', b'i', b'j', b'k', b'm', b'n', b'o', b'p', b'q', b'r', b's', b't', b'v', b'w', b'x', b'y', b'z',
-];
-/// Reverse table for BASE24 alphabet, indexed relative to 'a' or 'A'.
-const BASE24_ALPHABET_INV: [u8; 26] = [
-    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 255, 11, 12, 13, 14, 15, 16, 17, 18, 255, 19, 20, 21, 22, 23,
-];
-
-/// Encode 4 binary bytes into 7 base24 characters.
-pub fn encode_4to7(b: &[u8], s: &mut String) {
-    let mut n = u32::from_be_bytes(b[..4].try_into().unwrap());
-    for _ in 0..6 {
-        s.push(BASE24_ALPHABET[(n % 24) as usize] as char);
-        n /= 24;
-    }
-    s.push(BASE24_ALPHABET[n as usize] as char);
-}
-
-pub fn decode_7to4(mut s: &[u8]) -> Result<[u8; 4], InvalidParameterError> {
-    let mut n = 0u32;
-    if s.len() > 7 {
-        s = &s[..7];
-    }
-    for c in s.iter().rev() {
-        let mut c = *c;
-        if c >= 97 && c <= 122 {
-            c -= 97;
-        } else if c >= 65 && c <= 90 {
-            c -= 65;
-        } else {
-            return Err(InvalidParameterError("invalid base24 character"));
-        }
-        let i = BASE24_ALPHABET_INV[c as usize];
-        if i == 255 {
-            return Err(InvalidParameterError("invalid base24 character"));
-        }
-        n *= 24;
-        n = n.wrapping_add(i as u32);
-    }
-    return Ok(n.to_be_bytes());
-}

src/lib.rs

@@ -7,7 +7,6 @@
  */
 
 pub mod arrayvec;
-pub mod base24;
 pub mod base64;
 pub mod blob;
 pub mod buffer;