private val hostAddresses: MutableMap<String, List<InetAddress>> = mutableMapOf()
  private val requestedHosts: MutableList<String> = mutableListOf()
  private var nextAddress = 0xff000064L // 255.0.0.100 in IPv4; ::ff00:64 in IPv6.

  /** Sets the results for `hostname`.  */
  operator fun set(
    hostname: String,
    addresses: List<InetAddress>,
  ): FakeDns {
    hostAddresses[hostname] = addresses
    return this
  }

        "protocol=$requestingProtocol scheme=$requestingScheme",
    )
    return authentication
  }

  companion object {
    /** base64("username:password")  */
    const val BASE_64_CREDENTIALS = "dXNlcm5hbWU6cGFzc3dvcmQ="
  }

        if: steps.avd-cache.outputs.cache-hit != 'true'
        uses: reactivecircus/android-emulator-runner@v2
        with:
          api-level: ${{ matrix.api-level }}
          arch: ${{ matrix.api-level == '34' && 'x86_64' || 'x86' }}
          force-avd-creation: false
          emulator-options: -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
          disable-animations: false

    val length = content.size
    if (length < 128) {
      sink.writeByte(length.toInt())
    } else {
      // count how many bytes we'll need to express the length.
      val lengthBitCount = 64 - java.lang.Long.numberOfLeadingZeros(length)
      val lengthByteCount = (lengthBitCount + 7) / 8
      sink.writeByte(0b1000_0000 or lengthByteCount)
      for (shift in (lengthByteCount - 1) * 8 downTo 0 step 8) {

 * sample of code points to detect unicode control characters commonly used in binary file
 * signatures.
 */
fun Buffer.isProbablyUtf8(): Boolean {
  try {
    val prefix = Buffer()
    val byteCount = size.coerceAtMost(64)
    copyTo(prefix, 0, byteCount)
    for (i in 0 until 16) {
      if (prefix.exhausted()) {
        break
      }
      val codePoint = prefix.readUtf8CodePoint()

    server.enqueue(
      MockResponse.Builder()
        .body(
          Buffer()
            .write(ByteArray(responseBodySize)),
        )
        .throttleBody(64 * 1024, 125, MILLISECONDS) // 500 Kbps
        .build(),
    )
    val call = client.newCall(Request(server.url("/")))
    val response = call.execute()
    cancelLater(call, 500)

            for (i in 0 until n) {
              sink.writeByte('x'.code)
            }
          } else {
            val buf = ByteArray(if (writeKind == WriteKind.SMALL_BUFFERS) 256 else 64 * 1024)
            Arrays.fill(buf, 'x'.code.toByte())
            var i = 0
            while (i < n) {
              sink.write(buf, 0, Math.min(buf.size, n - i))
              i += buf.size
            }

      apply {
        this.systemDns = systemDns
      }
  }

  companion object {
    val DNS_MESSAGE: MediaType = "application/dns-message".toMediaType()
    const val MAX_RESPONSE_SIZE = 64 * 1024

    private fun buildBootstrapClient(builder: Builder): Dns {
      val hosts = builder.bootstrapDnsHosts

      return if (hosts != null) {
        BootstrapDns(builder.url!!.host, hosts)
      } else {

      if (!other.isSet(i)) continue
      set(i, other[i])
    }
  }

  companion object {
    /**
     * From the HTTP/2 specs, the default initial window size for all streams is 64 KiB. (Chrome 25
     * uses 10 MiB).
     */
    const val DEFAULT_INITIAL_WINDOW_SIZE = 65535

    /** HTTP/2: Size in bytes of the table used to decode the sender's header blocks. */

    append("-----END CERTIFICATE-----\n")
  }
}

internal fun StringBuilder.encodeBase64Lines(data: ByteString) {
  val base64 = data.base64()
  for (i in 0 until base64.length step 64) {
    append(base64, i, minOf(i + 64, base64.length)).append('\n')
  }