index/src/Serialisation/UriBase64.php

<?php
// UriBase64.php
// Created: 2022-01-13
// Updated: 2023-07-21

namespace Index\Serialisation;

use Index\IO\Stream;

/**
 * Provides URL-safe Base64 encoding.
 */
final class UriBase64 {
    /**
     * Encodes binary data as a Base64 string.
     *
     * @param string $input Input binary data.
     * @return string Base64 string representing the binary data.
     */
    public static function encode(mixed $input): string {
        return rtrim(strtr(base64_encode((string)$input), '+/', '-_'), '=');
    }

    /**
     * Decodes a Base64 string back to binary data.
     *
     * @param Stream|string $input Input Base64 string.
     * @return string Binary data.
     */
    public static function decode(Stream|string $input): mixed {
        $input = (string)$input;
        return base64_decode(str_pad(strtr($input, '-_', '+/'), strlen($input) % 4, '=', STR_PAD_RIGHT));
    }
}