For decoding/encoding base 64 strings at compile-time.

Examples

Encoding

```rust use constbase::{encode, encodeas_str, Config};

{ // the encoding macros can take both &str and &[u8] constants. const OUTA: &[u8; 4] = encode!("foo", Config::B64); const OUTB: &[u8; 4] = encode!(b"foo", Config::B64);

assert_eq!(OUTA, b"Zm9v");
assert_eq!(OUTB, b"Zm9v");

} { const BYTES: &[u8] = b"hello";

// the encoding macros can encode non-literal constants
const OUT: &str = encode_as_str!(BYTES, Config::B64_URL_SAFE);

assert_eq!(OUT, "aGVsbG8=");

} ```

Decoding

```rust use const_base::{decode, Config};

{ const OUT: &[u8] = decode!("Zm9v", Config::B64);

assert_eq!(OUT, b"foo");

} { const BYTES: &str = "aGVsbG8";

// this macro can decode non-literal constants
const OUT: &[u8] = decode!(BYTES, Config::B64_URL_SAFE.end_padding(false));

assert_eq!(OUT, b"hello");

} ```

No-std support

const_base is #![no_std], it can be used anywhere Rust can be used.

Minimum Supported Rust Version

const_base requires Rust 1.51.0, because it uses const generics.