1 /*
2  * Copyright (C) 2014 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.bluetooth.util;
18 
19 /** Utility for parsing numbers in Bluetooth. */
20 public class NumberUtils {
21 
22     /** Convert a byte to unsigned int. */
unsignedByteToInt(byte b)23     public static int unsignedByteToInt(byte b) {
24         return b & 0xFF;
25     }
26 
27     /** Convert a little endian byte array to integer. */
littleEndianByteArrayToInt(byte[] bytes)28     public static int littleEndianByteArrayToInt(byte[] bytes) {
29         int length = bytes.length;
30         if (length == 0) {
31             return 0;
32         }
33         int result = 0;
34         for (int i = length - 1; i >= 0; i--) {
35             int value = unsignedByteToInt(bytes[i]);
36             result += (value << (i * 8));
37         }
38         return result;
39     }
40 }
41