messageBuffer.write(data)

    var b0 = formatOpcode or B0_FLAG_FIN
    if (perMessageDeflate && data.size >= minimumDeflateSize) {
      val messageDeflater =
        this.messageDeflater
          ?: MessageDeflater(noContextTakeover).also { this.messageDeflater = it }
      messageDeflater.deflate(messageBuffer)
      b0 = b0 or B0_FLAG_RSV1
    }
    val dataSize = messageBuffer.size

    val b0: Int
    val timeoutBefore = source.timeout().timeoutNanos()
    source.timeout().clearTimeout()
    try {
      b0 = source.readByte() and 0xff
    } finally {
      source.timeout().timeout(timeoutBefore, TimeUnit.NANOSECONDS)
    }

    opcode = b0 and B0_MASK_OPCODE
    isFinalFrame = b0 and B0_FLAG_FIN != 0
    isControlFrame = b0 and OPCODE_FLAG_CONTROL != 0

  internal const val B0_FLAG_FIN = 128

  /** Byte 0 reserved flag 1. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV1 = 64

  /** Byte 0 reserved flag 2. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV2 = 32

  /** Byte 0 reserved flag 3. Must be 0 unless negotiated otherwise. */
  internal const val B0_FLAG_RSV3 = 16

        val entryIndex = index * 4
        val b0 = ranges[entryIndex].code
        return@binarySearch target.compareTo(b0)
      }

    return when {
      offset >= 0 -> offset * 4 // This entry was found by binary search.
      else -> (-offset - 2) * 4 // Not found? Use the preceding element.
    }
  }
}

internal fun String.read14BitInt(index: Int): Int {
  val b0 = this[index].code
  val b1 = this[index + 1].code