Function encodeBase58

encoding/base58.ts:56–104

(data: ArrayBuffer | Uint8Array | string)

 * ```
 */
export function encodeBase58(data: ArrayBuffer | Uint8Array | string): string {
  const uint8tData = validateBinaryLike(data);

  let length = 0;
  let zeroes = 0;

  // Counting leading zeroes
  let index = 0;
  while (uint8tData[index] === 0) {
    zeroes++;
    index++;
  }

  const notZeroUint8Data = uint8tData.slice(index);

  const size = Math.round((uint8tData.length * 138) / 100 + 1);
  const b58Encoding: number[] = [];

  notZeroUint8Data.forEach((byte) => {
    let i = 0;
    let carry = byte;

    for (
      let reverseIterator = size - 1;
      (carry > 0 || i < length) && reverseIterator !== -1;
      reverseIterator--, i++
    ) {
      carry += (b58Encoding[reverseIterator] ?? 0) * 256;
      b58Encoding[reverseIterator] = Math.round(carry % 58);
      carry = Math.floor(carry / 58);
    }

    length = i;
  });

  const strResult: string[] = Array.from({
    length: b58Encoding.length + zeroes,
  });

  if (zeroes > 0) {
    strResult.fill("1", 0, zeroes);
  }

  b58Encoding.forEach((byteValue) =>
    strResult.push(base58alphabet[byteValue]!)
  );

  return strResult.join("");
}

/**
 * Decodes a base58-encoded string.