convert method

@override String convert(Uint8List bytes)

Converts input and returns the result of the conversion.

Implementation

@override
String convert(Uint8List bytes) {
  var zeroes = 0;
  var length = 0;
  var begin = 0;
  var end = bytes.length;
  while (begin != end && bytes[begin] == 0) {
    begin++;
    zeroes++;
  }

  /// Allocate enough space in big-endian base58 representation.
  var size = ((end - begin) * (log(256) / log(alphabet.length)) + 1).toInt();
  var b58 = Uint8List(size);

  /// Process the bytes.
  while (begin != end) {
    var carry = bytes[begin];

    /// Apply "b58 = b58 * 256 + ch".
    var i = 0;
    for (var it1 = size - 1;
        (carry != 0 || i < length) && (it1 != -1);
        it1--, i++) {
      carry += (256 * b58[it1]);
      b58[it1] = (carry % alphabet.length);
      carry = (carry ~/ alphabet.length);
    }
    if (carry != 0) {
      throw FormatException('Non-zero carry');
    }
    length = i;
    begin++;
  }

  /// Skip leading zeroes in base58 result.
  var it2 = size - length;
  while (it2 != size && b58[it2] == 0) {
    it2++;
  }

  /// Translate the result into a string.
  var str = ''.padLeft(zeroes, alphabet[0]);
  for (; it2 < size; ++it2) {
    str += alphabet[b58[it2]];
  }
  return str;
}