static String bytesToBase64()

in lib/src/crypto.dart [62:116]
45 lines of code
11 McCabe index (conditional complexity)

  static String bytesToBase64(List<int> bytes,
      [bool urlSafe = false, bool addLineSeparator = false]) {
    int len = bytes.length;
    if (len == 0) {
      return "";
    }
    final String lookup = urlSafe ? _encodeTableUrlSafe : _encodeTable;
    // Size of 24 bit chunks.
    final int remainderLength = len.remainder(3);
    final int chunkLength = len - remainderLength;
    // Size of base output.
    int outputLen = ((len ~/ 3) * 4) + ((remainderLength > 0) ? 4 : 0);
    // Add extra for line separators.
    if (addLineSeparator) {
      outputLen += ((outputLen - 1) ~/ LINE_LENGTH) << 1;
    }
    List<int> out = List<int>.filled(outputLen, null);

    // Encode 24 bit chunks.
    int j = 0, i = 0, c = 0;
    while (i < chunkLength) {
      int x = ((bytes[i++] << 16) & 0xFFFFFF) |
          ((bytes[i++] << 8) & 0xFFFFFF) |
          bytes[i++];
      out[j++] = lookup.codeUnitAt(x >> 18);
      out[j++] = lookup.codeUnitAt((x >> 12) & 0x3F);
      out[j++] = lookup.codeUnitAt((x >> 6) & 0x3F);
      out[j++] = lookup.codeUnitAt(x & 0x3f);
      // Add optional line separator for each 76 char output.
      if (addLineSeparator && ++c == 19 && j < outputLen - 2) {
        out[j++] = CR;
        out[j++] = LF;
        c = 0;
      }
    }

    // If input length if not a multiple of 3, encode remaining bytes and
    // add padding.
    if (remainderLength == 1) {
      int x = bytes[i];
      out[j++] = lookup.codeUnitAt(x >> 2);
      out[j++] = lookup.codeUnitAt((x << 4) & 0x3F);
      out[j++] = PAD;
      out[j++] = PAD;
    } else if (remainderLength == 2) {
      int x = bytes[i];
      int y = bytes[i + 1];
      out[j++] = lookup.codeUnitAt(x >> 2);
      out[j++] = lookup.codeUnitAt(((x << 4) | (y >> 4)) & 0x3F);
      out[j++] = lookup.codeUnitAt((y << 2) & 0x3F);
      out[j++] = PAD;
    }

    return String.fromCharCodes(out);
  }