val fileOperator = FileOperator(randomAccessFile.channel)

      // Read the header.
      val header = Buffer()
      fileOperator.read(0, header, FILE_HEADER_SIZE)
      val prefix = header.readByteString(PREFIX_CLEAN.size.toLong())
      if (prefix != PREFIX_CLEAN) throw IOException("unreadable cache file")
      val upstreamSize = header.readLong()
      val metadataSize = header.readLong()

      type = TYPE_MAPPED,
      mappedTo =
        Buffer().also {
          for (cp in mappedToCodePoints) {
            it.writeUtf8CodePoint(cp)
          }
        }.readByteString(),
    )

   */
  fun toDer(
    writer: DerWriter,
    value: T,
  )

  fun toDer(value: T): ByteString {
    val buffer = Buffer()
    val writer = DerWriter(buffer)
    toDer(writer, value)
    return buffer.readByteString()
  }

  /**
   * Returns an adapter that expects this value wrapped by another value. Typically this occurs
   * when a value has both a context or application tag and a universal tag.
   *

        .writeByte(0xE7)
        .writeByte(3) // String literal not Huffman encoded (len = 3).
        .writeByte('b'.code)
        .writeByte('a'.code)
        .writeByte('r'.code)
        .readByteString()
    val actual = bytesOut.readByteString()
    assertThat(actual).isEqualTo(expected)
  }

  @Test
  fun staticTableIndexedHeaders() {
    hpackWriter!!.writeHeaders(headerEntries(":method", "GET"))
    assertBytes(0x82)

      source: BufferedSource,
      length: Int,
    ) {
      check(type == -1)
      this.type = Http2.TYPE_DATA
      this.inFinished = inFinished
      this.streamId = streamId
      this.data = source.readByteString(length.toLong()).toByteArray()
    }

    override fun rstStream(
      streamId: Int,
      errorCode: ErrorCode,
    ) {
      check(type == -1)
      this.type = Http2.TYPE_RST_STREAM

    }

    skipRestOfLine()

    result +=
      Mapping(
        sourceCodePoint0.toInt(),
        sourceCodePoint1.toInt(),
        type,
        mappedTo.readByteString(),
      )
  }

  return SimpleIdnaMappingTable(result)
}

internal data class Mapping(
  val sourceCodePoint0: Int,
  val sourceCodePoint1: Int,
  val type: Int,

        throw IOException(
          "response size exceeds limit ($MAX_RESPONSE_SIZE bytes): ${body.contentLength()} bytes",
        )
      }

      val responseBytes = body.source().readByteString()

      return DnsRecordCodec.decodeAnswers(hostname, responseBytes)
    }
  }

  private fun buildRequest(
    hostname: String,
    type: Int,
  ): Request =

        ) {
          assertThat(inFinished).isFalse()
          assertThat(streamId).isEqualTo(expectedStreamId)
          assertThat(length).isEqualTo(Http2.INITIAL_MAX_FRAME_SIZE)
          val data = source.readByteString(length.toLong())
          for (b in data.toByteArray()) {
            assertThat(b).isEqualTo(2.toByte())
          }
        }
      },
    )
  }

  @Test fun dataFrameNotAssociateWithStream() {

        " user-agent:OkHttp" +
        "]}",
    )
  }

  private fun bodyToHex(body: RequestBody): String {
    val buffer = Buffer()
    body.writeTo(buffer)
    return buffer.readByteString().hex()
  }

  private fun ByteString.offByOneBit(): ByteString {
    return Buffer()
      .write(this, 0, size - 1)
      .writeByte(this[size - 1].toInt() xor 1)
      .readByteString()
  }

  private fun date(s: String): Date {
    return SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").run {
      timeZone = TimeZone.getTimeZone("GMT")
      parse(s)
    }
  }