codePointString: String,
    encoding: UrlComponentEncodingTester.Encoding,
    component: Component,
  ) {
    testToUrl(codePoint, encoding, component)
    testFromUrl(codePoint, encoding, component)
    testUri(codePoint, codePointString, encoding, component)
  }

  private fun testToUrl(
    codePoint: Int,
    encoding: UrlComponentEncodingTester.Encoding,
    component: Component,
  ) {

): String {
  var codePoint: Int
  var i = pos
  while (i < limit) {
    codePoint = codePointAt(i)
    if (codePoint < 0x20 ||
      codePoint == 0x7f ||
      codePoint >= 0x80 &&
      !unicodeAllowed ||
      codePoint.toChar() in encodeSet ||
      codePoint == '%'.code &&
      (!alreadyEncoded || strict && !isPercentEncoded(i, limit)) ||
      codePoint == '+'.code &&
      plusIsSpace

  private static long codePointToFourUtf8Bytes(int codePoint) {
    // codePoint has at most 21 bits
    return ((0xFL << 4) | (codePoint >>> 18))
        | ((0x80L | (0x3F & (codePoint >>> 12))) << 8)
        | ((0x80L | (0x3F & (codePoint >>> 6))) << 16)
        | ((0x80L | (0x3F & codePoint)) << 24);
  }

  private static long charToThreeUtf8Bytes(char c) {
    return ((0x7L << 5) | (c >>> 12))

 */
fun String.escapeDataString(): String =
  buildString {
    for (codePoint in this@escapeDataString.codePoints()) {
      when (codePoint) {
        in 0..0x20,
        '"'.code,
        '$'.code,
        '\\'.code,
        '·'.code,
        127,
        -> append(String.format("\\u%04x", codePoint))

        else -> appendCodePoint(codePoint)
      }
    }

  private static long codePointToFourUtf8Bytes(int codePoint) {
    // codePoint has at most 21 bits
    return ((0xFL << 4) | (codePoint >>> 18))
        | ((0x80L | (0x3F & (codePoint >>> 12))) << 8)
        | ((0x80L | (0x3F & (codePoint >>> 6))) << 16)
        | ((0x80L | (0x3F & codePoint)) << 24);
  }

  private static long charToThreeUtf8Bytes(char c) {
    return ((0x7L << 5) | (c >>> 12))

          continue
        }
        testEncodeAndDecode(codePoint, codePointString, component)
        if (encoding == Encoding.SKIP) continue
        testParseOriginal(codePoint, codePointString, encoding, component)
        testParseAlreadyEncoded(codePoint, encoding, component)

        val platform = urlComponentEncodingTesterJvmPlatform(component)
        platform.test(codePoint, codePointString, encoding, component)
      }
    }

      StringBuilder sb = new StringBuilder();
      for (int j = 0; j < charCount; j++) {
        int codePoint;
        // discard illegal surrogate "codepoints"
        do {
          codePoint = rnd.nextInt(maxCodePoint.value);
        } while (Character.isSurrogate((char) codePoint));
        sb.appendCodePoint(codePoint);
      }
      strings[i] = sb.toString();
    }
  }

  @Benchmark

    assertThat(formEncode(255)).isEqualTo("%C3%BF")
  }

  @Throws(IOException::class)
  private fun formEncode(codePoint: Int): String {
    // Wrap the codepoint with regular printable characters to prevent trimming.
    val body =
      FormBody
        .Builder()
        .add("a", String(intArrayOf('b'.code, codePoint, 'c'.code), 0, 3))
        .build()
    val buffer = Buffer()
    body.writeTo(buffer)

  val bufferA = Buffer().writeUtf8(host)
  val bufferB = Buffer()

  // 1. Map, from bufferA to bufferB.
  while (!bufferA.exhausted()) {
    val codePoint = bufferA.readUtf8CodePoint()
    if (!IDNA_MAPPING_TABLE.map(codePoint, bufferB)) return null
  }

  // 2. Normalize, from bufferB to bufferA.
  val normalized = normalizeNfc(bufferB.readUtf8())
  bufferA.writeUtf8(normalized)

        if (byte2 > (byte) 0xBF
            // Overlong? 5 most significant bits must not all be zero.
            || (byte1 == (byte) 0xE0 && byte2 < (byte) 0xA0)
            // Check for illegal surrogate codepoints.
            || (byte1 == (byte) 0xED && byte2 >= (byte) 0xA0)
            // Third byte trailing-byte test.
            || bytes[index++] > (byte) 0xBF) {
          return false;
        }
      } else {