in 'a'..'f' -> this - 'a' + 10
    in 'A'..'F' -> this - 'A' + 10
    else -> -1
  }

internal infix fun Byte.and(mask: Int): Int = toInt() and mask

internal infix fun Short.and(mask: Int): Int = toInt() and mask

internal infix fun Int.and(mask: Long): Long = toLong() and mask

@Throws(IOException::class)
internal fun BufferedSink.writeMedium(medium: Int) {
  writeByte(medium.ushr(16) and 0xff)

//
//go:nosplit
func setSignalstackSP(s *stackt, sp uintptr) {
	s.ss_sp = sp
}

//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
	*mask |= 1 << (uint32(i) - 1)
}

func sigdelset(mask *sigset, i int) {
	*mask &^= 1 << (uint32(i) - 1)
}

//go:nosplit
func (c *sigctxt) fixsigcode(sig uint32) {
}

func setProcessCPUProfiler(hz int32) {

	}

	pattern := event.NewPattern(prefix, suffix)

	var eventNames []event.Name
	var mask pubsub.Mask
	for _, s := range values[peerRESTListenEvents] {
		eventName, err := event.ParseName(s)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		mask.MergeMaskable(eventName)
		eventNames = append(eventNames, eventName)
	}

	if bucketName != "" {

  internal const val B0_FLAG_RSV3 = 16

  /** Byte 0 mask for the frame opcode. */
  internal const val B0_MASK_OPCODE = 15

  /** Flag in the opcode which indicates a control frame. */
  internal const val OPCODE_FLAG_CONTROL = 8

  /**
   * Byte 1 flag for whether the payload data is masked.
   *
   * If this flag is set, the next four

	// ITypeImmMask is a mask including only the immediate portion of
	// I-type instructions.
	ITypeImmMask = 0xfff00000

	// JTypeImmMask is a mask including only the immediate portion of
	// J-type instructions.
	JTypeImmMask = 0xfffff000

	// STypeImmMask is a mask including only the immediate portion of
	// S-type instructions.
	STypeImmMask = 0xfe000f80

	// UTypeImmMask is a mask including only the immediate portion of

//go:linkname abigen_sync_atomic_OrInt64 sync/atomic.OrInt64
func abigen_sync_atomic_OrInt64(addr *int64, mask int64) (old int64)

//go:linkname abigen_sync_atomic_OrUint64 sync/atomic.OrUint64
func abigen_sync_atomic_OrUint64(addr *uint64, mask uint64) (old uint64)

//go:linkname abigen_sync_atomic_OrUintptr sync/atomic.OrUintptr
func abigen_sync_atomic_OrUintptr(addr *uintptr, mask uintptr) (old uintptr)

the SIGPROF signal in particular.

The non-Go code should not change the signal mask on any threads
created by the Go runtime. If the non-Go code starts new threads
itself, those threads may set the signal mask as they please.

If the non-Go code starts a new thread, changes the signal mask, and
then invokes a Go function in that thread, the Go runtime will

      setPredecessor(succ, pred);
    }
  }

  @Override
  void insertEntry(
      int entryIndex, @ParametricNullness K key, @ParametricNullness V value, int hash, int mask) {
    super.insertEntry(entryIndex, key, value, hash, mask);
    setSucceeds(lastEntry, entryIndex);
    setSucceeds(entryIndex, ENDPOINT);
  }

  @Override
  void accessEntry(int index) {
    if (accessOrder) {

	separator := byte(0x80) // gets reset to 0x00 once used
	for i := byte(0); i < chunk; i++ {
		mask := byte(int8(i-nx) >> 7) // 0x00 after the end of data

		// if we reached the end of the data, replace with 0x80 or 0x00
		d.x[i] = (^mask & separator) | (mask & d.x[i])

		// zero the separator once used
		separator &= mask

		if i >= 56 {
			// we might have to write the length here if all fit in one block

}

func adjustScore(typ scoreAdjustTyp, score int, mask scoreAdjustTyp) (int, scoreAdjustTyp) {

	if isMust(typ) {
		if mask&typ != 0 {
			return score, mask
		}
		may := mustToMay(typ)
		if mask&may != 0 {
			// promote may to must, so undo may
			score -= adjValue(may)
			mask &^= may
		}
	} else if isMay(typ) {
		must := mayToMust(typ)
		if mask&(must|typ) != 0 {
			return score, mask
		}
	}