*/
internal class DerReader(source: Source) {
  private val countingSource: CountingSource = CountingSource(source)
  private val source: BufferedSource = countingSource.buffer()

  /** Total bytes read thus far. */
  private val byteCount: Long
    get() = countingSource.bytesRead - source.buffer.size

  /** How many bytes to read before [peekHeader] should return false, or -1L for no limit. */
  private var limit = -1L

  private val openConnections =
    Collections.newSetFromMap(ConcurrentHashMap<Http2Connection, Boolean>())

  private val atomicRequestCount = AtomicInteger()

  /**
   * The number of HTTP requests received thus far by this server. This may exceed the number of
   * HTTP connections when connection reuse is in practice.
   */
  val requestCount: Int
    get() = atomicRequestCount.get()

   3220-3243
   3260-327B
   327F-32B0
   32C0-32CB
   32D0-32FE
   3300-3376
   337B-33DD
   33E0-33FE
   3400-4DB5
   4E00-9FA5
   A000-A48C
   AC00-D7A3
   D800-FA2D
   FA30-FA6A
   FB00-FB06
   FB13-FB17
   FF21-FF3A
   FF41-FF5A
   FF66-FFBE
   FFC2-FFC7
   FFCA-FFCF
   FFD2-FFD7
   FFDA-FFDC
   10300-1031E
   10320-10323
   10330-1034A
   10400-10425

0E01..0E32    ; valid                                  # 1.1  THAI CHARACTER KO KAI..THAI CHARACTER SARA AA
0E33          ; mapped                 ; 0E4D 0E32     # 1.1  THAI CHARACTER SARA AM
0E34..0E3A    ; valid                                  # 1.1  THAI CHARACTER SARA I..THAI CHARACTER PHINTHU
0E3B..0E3E    ; disallowed                             # NA   <reserved-0E3B>..<reserved-0E3E>