*            wrapped uuid
     */
    public UUID ( rpc.uuid_t uuid ) {
        this.time_low = uuid.time_low;
        this.time_mid = uuid.time_mid;
        this.time_hi_and_version = uuid.time_hi_and_version;
        this.clock_seq_hi_and_reserved = uuid.clock_seq_hi_and_reserved;
        this.clock_seq_low = uuid.clock_seq_low;
        this.node = new byte[6];
        this.node[ 0 ] = uuid.node[ 0 ];

    private static short S(int i) { return (short)(i & 0xFFFF); }

    public UUID(rpc.uuid_t uuid) {
        time_low = uuid.time_low;
        time_mid = uuid.time_mid;
        time_hi_and_version = uuid.time_hi_and_version;
        clock_seq_hi_and_reserved = uuid.clock_seq_hi_and_reserved;
        clock_seq_low = uuid.clock_seq_low;
        node = new byte[6];
        node[0] = uuid.node[0];
        node[1] = uuid.node[1];

    char[] surrogates = {
      MAX_LOW_SURROGATE, MAX_HIGH_SURROGATE, MIN_LOW_SURROGATE, MIN_HIGH_SURROGATE,
    };
    for (char surrogate : surrogates) {
      builder.add(newString(surrogate));
      builder.add(newString(surrogate, 'n'));
      builder.add(newString('n', surrogate));
      builder.add(newString(surrogate, surrogate));
    }
    builder.add(newString(MIN_LOW_SURROGATE, MAX_HIGH_SURROGATE));

   *         <li><b>If the next character was a valid low surrogate, the code point value of the
   *             high/low surrogate pair is returned.</b>
   *         <li>If the next character was not a low surrogate value, then {@link
   *             IllegalArgumentException} is thrown.
   *       </ol>
   *   <li>If the first character was a low surrogate value, {@link IllegalArgumentException} is
   *       thrown.

    // center will be at either low or high.
    int low = requiredFrom;
    int high = requiredTo;
    while (high > low + 1) {
      int mid = (low + high) >>> 1;
      if (allRequired[mid] > centerFloor) {
        high = mid;
      } else if (allRequired[mid] < centerFloor) {
        low = mid;
      } else {

  private static long shiftMix(long val) {
    return val ^ (val >>> 47);
  }

  /** Implementation of Hash128to64 from util/hash/hash128to64.h */
  @VisibleForTesting
  static long hash128to64(long high, long low) {
    long a = (low ^ high) * K3;
    a ^= (a >>> 47);
    long b = (high ^ a) * K3;
    b ^= (b >>> 47);
    b *= K3;
    return b;
  }

  /**

 *
 * <p>This class is usually preferable to {@link AtomicLong} when multiple threads update a common
 * sum that is used for purposes such as collecting statistics, not for fine-grained synchronization
 * control. Under low update contention, the two classes have similar characteristics. But under
 * high contention, expected throughput of this class is significantly higher, at the expense of
 * higher space consumption.
 *

        hashFunction.newHasher().putUnencodedChars(string).hash());
  }

  static char randomLowSurrogate(Random random) {
    return (char)
        (Character.MIN_LOW_SURROGATE
            + random.nextInt(Character.MAX_LOW_SURROGATE - Character.MIN_LOW_SURROGATE + 1));
  }

  static char randomHighSurrogate(Random random) {
    return (char)
        (Character.MIN_HIGH_SURROGATE

        dst[ ++dstIndex ] = (byte) ( val >> 8 );
    }


    public static long readTime ( byte[] src, int srcIndex ) {
        int low = readInt4(src, srcIndex);
        int hi = readInt4(src, srcIndex + 4);
        long t = ( (long) hi << 32L ) | ( low & 0xFFFFFFFFL );
        t = ( t / 10000L - SmbConstants.MILLISECONDS_BETWEEN_1970_AND_1601 );
        return t;
    }

   * returns the low 64 bits of the result.
   *
   * @since 14.0
   */
  public UnsignedLong plus(UnsignedLong val) {
    return fromLongBits(this.value + checkNotNull(val).value);
  }

  /**
   * Returns the result of subtracting this and {@code val}. If the result would have more than 64
   * bits, returns the low 64 bits of the result.
   *
   * @since 14.0
   */