/** 
 * @fileoverview base64 helper utilities.
 * @license
 * SPDX-License-Identifier: Apache-2.0
 */

/** Encodes Uint8Array to base64 string. */
export function encode(bytes: Uint8Array): string {
  let binary = '';
  const len = bytes.byteLength;
  for (let i = 0; i < len; i++) {
    binary += String.fromCharCode(bytes[i]);
  }
  return btoa(binary);
}

/** Decodes base64 string to Uint8Array. */
export function decode(base64: string): Uint8Array {
  const binaryString = atob(base64);
  const len = binaryString.length;
  const bytes = new Uint8Array(len);
  for (let i = 0; i < len; i++) {
    bytes[i] = binaryString.charCodeAt(i);
  }
  return bytes;
}