export default function bytesToBase64(bytes: number[] | Uint8Array) {
  let mod3: number;
  let result = '';

  for(let nLen = bytes.length, nUint24 = 0, nIdx = 0; nIdx < nLen; ++nIdx) {
    mod3 = nIdx % 3;
    nUint24 |= bytes[nIdx] << (16 >>> mod3 & 24);
    if(mod3 === 2 || nLen - nIdx === 1) {
      result += String.fromCharCode(
        uint6ToBase64(nUint24 >>> 18 & 63),
        uint6ToBase64(nUint24 >>> 12 & 63),
        uint6ToBase64(nUint24 >>> 6 & 63),
        uint6ToBase64(nUint24 & 63)
      );
      nUint24 = 0;
    }
  }

  return result.replace(/A(?=A$|$)/g, '=');
}

export function uint6ToBase64(nUint6: number) {
  return nUint6 < 26
    ? nUint6 + 65
    : nUint6 < 52
      ? nUint6 + 71
      : nUint6 < 62
        ? nUint6 - 4
        : nUint6 === 62
          ? 43
          : nUint6 === 63
            ? 47
            : 65;
}