1 /*
2  * Copyright (C) 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://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,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.server.uwb.params;
18 
19 import java.nio.ByteBuffer;
20 import java.nio.ByteOrder;
21 
22 public class TlvUtil {
getBytes(byte data)23     public static final byte[] getBytes(byte data) {
24         ByteBuffer buffer = ByteBuffer.allocate(Byte.BYTES).put(data);
25         return buffer.array();
26     }
27 
getBytes(short data)28     public static final byte[] getBytes(short data) {
29         ByteBuffer buffer = ByteBuffer.allocate(Short.BYTES).order(
30                 ByteOrder.BIG_ENDIAN).putShort(data);
31         return buffer.array();
32     }
33 
getLeBytes(short data)34     public static final byte[] getLeBytes(short data) {
35         ByteBuffer buffer = ByteBuffer.allocate(Short.BYTES).order(
36                 ByteOrder.LITTLE_ENDIAN).putShort(data);
37         return buffer.array();
38     }
39 
getBytes(int data)40     public static final byte[] getBytes(int data) {
41         ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES).order(
42                 ByteOrder.BIG_ENDIAN).putInt(data);
43         return buffer.array();
44     }
45 
getLeBytes(int data)46     public static final byte[] getLeBytes(int data) {
47         ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES).order(
48                 ByteOrder.LITTLE_ENDIAN).putInt(data);
49         return buffer.array();
50     }
51 
getBytes(long data)52     public static final byte[] getBytes(long data) {
53         ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES).order(
54                 ByteOrder.BIG_ENDIAN).putLong(data);
55         return buffer.array();
56     }
57 
getLeBytes(long data)58     public static final byte[] getLeBytes(long data) {
59         ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES).order(
60                 ByteOrder.LITTLE_ENDIAN).putLong(data);
61         return buffer.array();
62     }
63 
getReverseBytes(byte[] data)64     public static final byte[] getReverseBytes(byte[] data) {
65         byte[] buffer = new byte[data.length];
66         for (int i = 0; i < data.length; i++) {
67             buffer[i] = data[data.length - 1 - i];
68         }
69         return buffer;
70     }
71 
getBytes(int data, int start, int length)72     public static final byte[] getBytes(int data, int start, int length) {
73         ByteBuffer srcBuf = ByteBuffer.allocate(Integer.BYTES).putInt(data);
74         ByteBuffer dstBuf = ByteBuffer.allocate(length);
75         srcBuf.position(start);
76         dstBuf.put(srcBuf);
77         return dstBuf.array();
78     }
79 
getBytesWithLeftPadding(int size, byte[] data)80     public static final byte[] getBytesWithLeftPadding(int size, byte[] data) {
81         ByteBuffer buffer = ByteBuffer.allocate(size);
82         int startOffset = size - data.length;
83         buffer.position(startOffset);
84         buffer.put(data);
85         return buffer.array();
86     }
87 
getBytesWithRightPadding(int size, byte[] data)88     public static final byte[] getBytesWithRightPadding(int size, byte[] data) {
89         ByteBuffer buffer = ByteBuffer.allocate(size).put(data);
90         return buffer.array();
91     }
92 
93     /** Convert RSTU to microsecond */
rstuToUs(int value)94     public static final int rstuToUs(int value) {
95         return (int) (value * 416 / 499.2);
96     }
97 }
98