private static final int NAME_SERVICE_UDP_PORT = 137;

    static final byte[] UNKNOWN_MAC_ADDRESS = new byte[] {
        (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00
    };

    private static final Logger log = LoggerFactory.getLogger(NameServiceClientImpl.class);

    private final Object LOCK = new Object();

    private int nbnsIndex = 0;

    protected int readParameterWordsWireFormat ( byte[] buffer, int bufferIndex ) {
        int start = bufferIndex;

        buffer[ bufferIndex++ ] = (byte) 0x00; // Reserved
        buffer[ bufferIndex++ ] = (byte) 0x00; // Reserved
        buffer[ bufferIndex++ ] = (byte) 0x00; // Reserved

        this.totalParameterCount = SMBUtil.readInt4(buffer, bufferIndex);
        if ( this.bufDataStart == 0 ) {

    public static final int ACB_USE_DES_KEY_ONLY = 32768;
    public static final int ACB_DONT_REQUIRE_PREAUTH = 65536;

    public static class SamrCloseHandle extends DcerpcMessage {

        public int getOpnum() { return 0x01; }

        public int retval;
        public rpc.policy_handle handle;

        public SamrCloseHandle(rpc.policy_handle handle) {
            this.handle = handle;
        }

        int start = dstIndex;

        SMBUtil.writeInt2(this.fid, dst, dstIndex);
        dstIndex += 2;
        dst[ dstIndex++ ] = (byte) 0x00; // Reserved
        dst[ dstIndex++ ] = (byte) 0x00; // Reserved
        SMBUtil.writeInt4(this.securityInformation, dst, dstIndex);
        dstIndex += 4;
        return dstIndex - start;
    }


    @Override

        if (command != SMB_COM_NT_TRANSACT_SECONDARY) {
            dst[dstIndex++] = maxSetupCount;
        } else {
            dst[dstIndex++] = (byte)0x00;          // Reserved
        }
        dst[dstIndex++] = (byte)0x00;          // Reserved
        dst[dstIndex++] = (byte)0x00;          // Reserved
        writeInt4( totalParameterCount, dst, dstIndex );
        dstIndex += 4;
        writeInt4( totalDataCount, dst, dstIndex );

        maxDataCount = 0xFFFF;
        maxSetupCount = (byte)0x00;
        setupCount = 2;
    }

    int writeSetupWireFormat( byte[] dst, int dstIndex ) {
        dst[dstIndex++] = subCommand;
        dst[dstIndex++] = (byte)0x00;
        // this says "Transaction priority" in netmon
        dst[dstIndex++] = (byte)0x00; // no FID
        dst[dstIndex++] = (byte)0x00;
        return 4;
    }

        maxParameterCount = 0;
        maxDataCount = 0;
        maxSetupCount = (byte)0x00;
        setupCount = 2;
    }

    int writeSetupWireFormat( byte[] dst, int dstIndex ) {
        dst[dstIndex++] = subCommand;
        dst[dstIndex++] = (byte)0x00;
        dst[dstIndex++] = (byte)0x00; // no FID
        dst[dstIndex++] = (byte)0x00;
        return 4;
    }

        this.maxDataCount = 0;
        this.maxSetupCount = (byte) 0x00;
        this.setupCount = 2;
    }


    @Override
    protected int writeSetupWireFormat ( byte[] dst, int dstIndex ) {
        dst[ dstIndex++ ] = this.getSubCommand();
        dst[ dstIndex++ ] = (byte) 0x00;
        dst[ dstIndex++ ] = (byte) 0x00; // no FID
        dst[ dstIndex++ ] = (byte) 0x00;
        return 4;
    }


    @Override

            dst[ dstIndex++ ] = this.maxSetupCount;
        }
        else {
            dst[ dstIndex++ ] = (byte) 0x00; // Reserved
        }
        dst[ dstIndex++ ] = (byte) 0x00; // Reserved
        dst[ dstIndex++ ] = (byte) 0x00; // Reserved
        SMBUtil.writeInt4(this.totalParameterCount, dst, dstIndex);
        dstIndex += 4;
        SMBUtil.writeInt4(this.totalDataCount, dst, dstIndex);

    byte result = 0x01;
    for (int i = 0; i < reps; i++) {
      HashCode checksum = new Fingerprint2011().hashBytes(testBytes, 0, testBytes.length);
      result = (byte) (result ^ checksum.asLong());
    }
    return result;
  }

  // Helpers + main

  private byte runHashFunction(int reps, HashFunction hashFunction) {
    byte result = 0x01;