1 /*
2 * Copyright 2024 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.channel.uring;
17
18 final class UserData {
19 private UserData() {
20 }
21
22 /**
23 * Encode the given data into a long that can be stored as udata.
24 * layout
25 * 63 32 31 24 23 16 15 0
26 * [ id ][ unused ][ op ][ data ]
27 * @param id the id.
28 * @param op the operation
29 * @param data the custom data
30 * @return the udata.
31 */
32 static long encode(int id, byte op, short data) {
33 return ((long) id << Integer.SIZE) | ((op & 0xFFL) << Short.SIZE) | (data & 0xFFFFL);
34 }
35
36 static int decodeId(long udata) {
37 return (int) (udata >>> Integer.SIZE);
38 }
39
40 static byte decodeOp(long udata) {
41 return (byte) (udata >>> Short.SIZE);
42 }
43
44 static short decodeData(long udata) {
45 return (short) udata;
46 }
47 }