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 /** 20 * Utility for parsing numbers in Bluetooth. 21 */ 22 public class NumberUtils { 23 24 /** 25 * Convert a byte to unsigned int. 26 */ 27 public static int unsignedByteToInt(byte b) { 28 return b & 0xFF; 29 } 30 31 /** 32 * Convert a little endian byte array to integer. 33 */ 34 public static int littleEndianByteArrayToInt(byte[] bytes) { 35 int length = bytes.length; 36 if (length == 0) { 37 return 0; 38 } 39 int result = 0; 40 for (int i = length - 1; i >= 0; i--) { 41 int value = unsignedByteToInt(bytes[i]); 42 result += (value << (i * 8)); 43 } 44 return result; 45 } 46 } 47
