Trait Alphabet 

pub trait Alphabet {
    const ENCODE: [u8; 64];

    // Required method
    fn decode(byte: u8) -> Option<u8>;

    // Provided method
    fn encode(value: u8) -> u8 { ... }
}

A Base64 alphabet.

Required Associated Constants

const ENCODE: [u8; 64]

Encoding table indexed by 6-bit values.

Required Methods

fn decode(byte: u8) -> Option<u8>

Decode one byte into a 6-bit value.

Provided Methods

fn encode(value: u8) -> u8

Encode one 6-bit value into an alphabet byte.

The default implementation scans the alphabet table instead of using a secret-indexed table lookup. Built-in alphabets override this with the branch-minimized ASCII arithmetic mapper. Custom alphabets that keep the default method prioritize timing posture over throughput: every emitted Base64 byte performs a fixed 64-entry scan. For massive payloads with user-defined alphabets, profile this cost and consider an audited custom override only if the alphabet has a structure that can be mapped without secret-indexed table access.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl Alphabet for Bcrypt

const ENCODE: [u8; 64]

impl Alphabet for Crypt

const ENCODE: [u8; 64]

impl Alphabet for Standard

const ENCODE: [u8; 64]

impl Alphabet for UrlSafe

const ENCODE: [u8; 64]