}

          // The buffer has the data we need. Read from there and return immediately.
          val bytesToRead = minOf(byteCount, upstreamPos - sourcePos)
          buffer.copyTo(sink, sourcePos - bufferPos, bytesToRead)
          sourcePos += bytesToRead
          return bytesToRead
        }

      // Read from the file.
      if (source == SOURCE_FILE) {

            if (!cacheRequestClosed) {
              cacheRequestClosed = true
              cacheBody.close() // The cache response is complete!
            }
            return -1
          }

          sink.copyTo(cacheBody.buffer, sink.size - bytesRead, bytesRead)
          cacheBody.emitCompleteSegments()
          return bytesRead
        }

        override fun timeout(): Timeout = source.timeout()

  comparator: Comparator<String>,
): Int = indexOfFirst { comparator.compare(it, value) == 0 }

@Suppress("UNCHECKED_CAST")
internal fun Array<String>.concat(value: String): Array<String> {
  val result = copyOf(size + 1)
  result[result.lastIndex] = value
  return result as Array<String>
}

/** Increments [startIndex] until this string is not ASCII whitespace. Stops at [endIndex]. */

}

internal class BufferMockResponseBody(
  val buffer: Buffer,
) : MockResponseBody {
  override val contentLength = buffer.size

  override fun writeTo(sink: BufferedSink) {
    buffer.copyTo(sink.buffer)
    sink.emitCompleteSegments()
  }

        nameBuf.writeByte(utf8ByteCount.toInt())
        nameBuf.writeUtf8(label)
      }
      nameBuf.writeByte(0) // end

      nameBuf.copyTo(this, 0, nameBuf.size)
      writeShort(type)
      writeShort(1) // CLASS_IN
    }.readByteString()

  @Throws(Exception::class)
  fun decodeAnswers(
    hostname: String,
    byteString: ByteString,

 * 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()

      apply {
        require(tls) { "no cipher suites for cleartext connections" }
        require(cipherSuites.isNotEmpty()) { "At least one cipher suite is required" }

        this.cipherSuites = cipherSuites.copyOf() as Array<String> // Defensive copy.
      }

    fun allEnabledTlsVersions() =
      apply {
        require(tls) { "no TLS versions for cleartext connections" }
        this.tlsVersions = null
      }