/** Returns a callable that reads all of source, closes it, and returns the bytes.  */
  private fun sourceReader(source: Source?): Callable<ByteString> {
    return Callable {
      val buffer = Buffer()
      while (source!!.read(buffer, 16384) != -1L) {
      }
      source.close()
      buffer.readByteString()
    }
  }

  private fun assertFile(
    prefix: ByteString,
    upstreamSize: Long,

    // 1. Asterisk (*) is only permitted in the left-most domain name label and must be the
    //    only character in that label (i.e., must match the whole left-most label).
    //    For example, *.example.com is permitted, while *a.example.com, a*.example.com,
    //    a*b.example.com, a.*.example.com are not permitted.
    // 2. Asterisk (*) cannot match across domain name labels.

    fun chunkedBody(
      body: Buffer,
      maxChunkSize: Int,
    ) = apply {
      removeHeader("Content-Length")
      headers.add(CHUNKED_BODY_HEADER)

      val bytesOut = Buffer()
      while (!body.exhausted()) {
        val chunkSize = minOf(body.size, maxChunkSize.toLong())
        bytesOut.writeHexadecimalUnsignedLong(chunkSize)
        bytesOut.writeUtf8("\r\n")
        bytesOut.write(body, chunkSize)

    // Make an SSL Tunnel on the first message pair of each SSL + proxy connection.
    val url = route.address.url
    val requestLine = "CONNECT ${url.toHostHeader(includeDefaultPort = true)} HTTP/1.1"
    while (true) {
      val source = this.source!!
      val sink = this.sink!!
      val tunnelCodec =
        Http1ExchangeCodec(
          // No client for CONNECT tunnels:
          client = null,

    connection.setFixedLengthStreamingMode(1024 * 1024 * 1024) // 1 GB
    connection.connect()
    val out = connection.outputStream
    val data = ByteArray(1024 * 1024)
    var i = 0
    while (i < 1024) {
      try {
        out.write(data)
        out.flush()
        if (i == 513) {
          // pause slightly after halfway to make result more predictable
          Thread.sleep(100)
        }

      override fun contentLength(): Long {
        return if (chunked) -1L else size
      }

      override fun writeTo(sink: BufferedSink) {
        var count = 0
        while (count < size) {
          sink.write(buffer, 0, Math.min(size - count, writeSize.toLong()).toInt())
          count += writeSize
        }
      }
    }
  }

  @Test

      object : Comparator<String> {
        override fun compare(
          a: String,
          b: String,
        ): Int {
          var i = 4
          val limit = minOf(a.length, b.length)
          while (i < limit) {
            val charA = a[i]
            val charB = b[i]
            if (charA != charB) return if (charA < charB) -1 else 1
            i++
          }
          val lengthA = a.length

 * deterministic.
 *
 * This class ensures that at most one thread is running at a time. This is initially the JUnit test
 * thread, which yields its execution privilege while calling [runTasks], [runNextTask], or
 * [advanceUntil]. These functions don't return until the task threads are all idle.
 *
 * Task threads release their execution privilege in these ways:
 *

 *
 * Typical use loops over the parts in sequence:
 *
 * ```kotlin
 * val response: Response = call.execute()
 * val multipartReader = MultipartReader(response.body!!)
 *
 * multipartReader.use {
 *   while (true) {
 *     val part = multipartReader.nextPart() ?: break
 *     process(part.headers, part.body)
 *   }
 * }
 * ```
 *

   */
  operator fun invoke(input: String): String? = invoke(Buffer().writeUtf8(input))

  internal operator fun invoke(input: BufferedSource): String? {
    // 1. Map.
    val mapResult = Buffer()
    while (!input.exhausted()) {
      val codePoint = input.readUtf8CodePoint()
      when (val mappedCodePoint = mapping[codePoint]) {
        null -> mapResult.writeUtf8CodePoint(codePoint)