encode static method

String encode(Uint8List bytesList, { Encoding encoding = Encoding.standardRFC4648, })

Takes in a byteList converts it to a Uint8List so that I can run bit operations on it, then outputs a String representation of the base32.

Implementation

static String encode(Uint8List bytesList,
    {Encoding encoding = Encoding.standardRFC4648}) {
  var base32Chars = EncodingUtils.getChars(encoding);
  var i = 0;
  var count = (bytesList.length ~/ 5) * 5;
  var base32str = '';
  while (i < count) {
    var v1 = bytesList[i++];
    var v2 = bytesList[i++];
    var v3 = bytesList[i++];
    var v4 = bytesList[i++];
    var v5 = bytesList[i++];

    base32str += base32Chars[v1 >> 3] +
        base32Chars[(v1 << 2 | v2 >> 6) & 31] +
        base32Chars[(v2 >> 1) & 31] +
        base32Chars[(v2 << 4 | v3 >> 4) & 31] +
        base32Chars[(v3 << 1 | v4 >> 7) & 31] +
        base32Chars[(v4 >> 2) & 31] +
        base32Chars[(v4 << 3 | v5 >> 5) & 31] +
        base32Chars[v5 & 31];
  }

  var remain = bytesList.length - count;
  if (remain == 1) {
    var v1 = bytesList[i];
    base32str += base32Chars[v1 >> 3] + base32Chars[(v1 << 2) & 31];
    if (EncodingUtils.getPadded(encoding)) {
      base32str += '======';
    }
  } else if (remain == 2) {
    var v1 = bytesList[i++];
    var v2 = bytesList[i];
    base32str += base32Chars[v1 >> 3] +
        base32Chars[(v1 << 2 | v2 >> 6) & 31] +
        base32Chars[(v2 >> 1) & 31] +
        base32Chars[(v2 << 4) & 31];
    if (EncodingUtils.getPadded(encoding)) {
      base32str += '====';
    }
  } else if (remain == 3) {
    var v1 = bytesList[i++];
    var v2 = bytesList[i++];
    var v3 = bytesList[i];
    base32str += base32Chars[v1 >> 3] +
        base32Chars[(v1 << 2 | v2 >> 6) & 31] +
        base32Chars[(v2 >> 1) & 31] +
        base32Chars[(v2 << 4 | v3 >> 4) & 31] +
        base32Chars[(v3 << 1) & 31];
    if (EncodingUtils.getPadded(encoding)) {
      base32str += '===';
    }
  } else if (remain == 4) {
    var v1 = bytesList[i++];
    var v2 = bytesList[i++];
    var v3 = bytesList[i++];
    var v4 = bytesList[i];
    base32str += base32Chars[v1 >> 3] +
        base32Chars[(v1 << 2 | v2 >> 6) & 31] +
        base32Chars[(v2 >> 1) & 31] +
        base32Chars[(v2 << 4 | v3 >> 4) & 31] +
        base32Chars[(v3 << 1 | v4 >> 7) & 31] +
        base32Chars[(v4 >> 2) & 31] +
        base32Chars[(v4 << 3) & 31];
    if (EncodingUtils.getPadded(encoding)) {
      base32str += '=';
    }
  }
  return base32str;
}