return source.readByte().toInt() != 0
  }

  fun readBigInteger(): BigInteger {
    if (bytesLeft == 0L) throw ProtocolException("unexpected length: $bytesLeft at $this")
    val byteArray = source.readByteArray(bytesLeft)
    return BigInteger(byteArray)
  }

  fun readLong(): Long {
    if (bytesLeft !in 1..8) throw ProtocolException("unexpected length: $bytesLeft at $this")

import okio.Closeable
import okio.FileNotFoundException
import okio.FileSystem
import okio.IOException
import okio.Options
import okio.Path
import okio.use

@JvmField
internal val EMPTY_BYTE_ARRAY: ByteArray = ByteArray(0)

/** Byte order marks. */
internal val UNICODE_BOMS =
  Options.of(
    // UTF-8.
    "efbbbf".decodeHex(),
    // UTF-16BE.
    "feff".decodeHex(),
    // UTF-32LE.
    "fffe0000".decodeHex(),

  /** Used when an empty close frame was received (i.e., without a status code). */
  internal const val CLOSE_NO_STATUS_CODE = 1005

  fun toggleMask(
    cursor: Buffer.UnsafeCursor,
    key: ByteArray,
  ) {
    var keyIndex = 0
    val keyLength = key.size
    do {
      val buffer = cursor.data
      var i = cursor.start
      val end = cursor.end
      if (buffer != null) {

    }
    assertFailsWith<IndexOutOfBoundsException> {
      operator.write(0, buffer, 4L)
    }
  }

  private fun randomByteString(byteCount: Int): ByteString {
    val bytes = ByteArray(byteCount)
    Random(0).nextBytes(bytes)
    return ByteString.of(*bytes)
  }

  private fun snapshot(): ByteString {
    randomAccessFile!!.getChannel().force(false)
    val source = file!!.source().buffer()

    assertThat(actual).isEqualTo(expected)
  }

  companion object {
    private fun binaryData(length: Int): ByteString {
      val junk = ByteArray(length)
      Random(0).nextBytes(junk)
      return junk.toByteString()
    }
  }

    peer.sendFrame().data(false, 3, Buffer().write(ByteArray(dataLength)), dataLength)
    peer.sendFrame().data(false, 3, Buffer().write(ByteArray(dataLength)), dataLength)
    peer.sendFrame().data(false, 3, Buffer().write(ByteArray(dataLength)), dataLength)
    peer.sendFrame().data(false, 3, Buffer().write(ByteArray(dataLength)), dataLength)
    peer.sendFrame().data(false, 3, Buffer().write(ByteArray(1)), 1)

    @JvmField var errorCode: ErrorCode? = null

    @JvmField var windowSizeIncrement: Long = 0

    @JvmField var headerBlock: List<Header>? = null

    @JvmField var data: ByteArray? = null

    @JvmField var settings: Settings? = null

    @JvmField var ack = false

    @JvmField var payload1 = 0

    @JvmField var payload2 = 0

    override fun settings(

    /**
     * Returns the concatenation of 8-bit, length prefixed protocol names.
     * http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-04#page-4
     */
    fun concatLengthPrefixed(protocols: List<Protocol>): ByteArray {
      val result = Buffer()
      for (protocol in alpnProtocolNames(protocols)) {
        result.writeByte(protocol.length)
        result.writeUtf8(protocol)
      }
      return result.readByteArray()

   * @param debugData only valid for HTTP/2; opaque debug data to send.
   */
  @Throws(IOException::class)
  fun goAway(
    lastGoodStreamId: Int,
    errorCode: ErrorCode,
    debugData: ByteArray,
  ) {
    withLock {
      if (closed) throw IOException("closed")
      require(errorCode.httpCode != -1) { "errorCode.httpCode == -1" }
      frameHeader(
        streamId = 0,

    }.also { expected ->
      assertThat(expected.message!!).contains("closed")
    }
  }

  private fun binaryData(length: Int): ByteString {
    val junk = ByteArray(length)
    random.nextBytes(junk)
    return junk.toByteString()
  }