1 /* 2 * Copyright (C) 2015 Samsung System LSI 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 17 package com.android.bluetooth; 18 19 import com.android.bluetooth.map.BluetoothMapUtils; 20 21 import java.io.UnsupportedEncodingException; 22 23 /** 24 * Class to represent a 128bit value using two long member variables. 25 * Has functionality to convert to/from hex-strings. 26 * Mind that since signed variables are used to store the value internally 27 * is used, the MSB/LSB long values can be negative. 28 */ 29 public class SignedLongLong implements Comparable<SignedLongLong> { 30 31 private long mMostSigBits; 32 private long mLeastSigBits; 33 SignedLongLong(long leastSigBits, long mostSigBits)34 public SignedLongLong(long leastSigBits, long mostSigBits) { 35 this.mMostSigBits = mostSigBits; 36 this.mLeastSigBits = leastSigBits; 37 } 38 39 /** 40 * Create a SignedLongLong from a Hex-String without "0x" prefix 41 * @param value the hex-string 42 * @return the created object 43 * @throws UnsupportedEncodingException 44 */ fromString(String value)45 public static SignedLongLong fromString(String value) throws UnsupportedEncodingException { 46 String lsbStr, msbStr; 47 long lsb = 0, msb = 0; 48 49 lsbStr = msbStr = null; 50 if (value == null) { 51 throw new NullPointerException(); 52 } 53 value = value.trim(); 54 int valueLength = value.length(); 55 if (valueLength == 0 || valueLength > 32) { 56 throw new NumberFormatException("invalid string length: " + valueLength); 57 } 58 if (valueLength <= 16) { 59 lsbStr = value; 60 } else { 61 lsbStr = value.substring(valueLength - 16, valueLength); 62 msbStr = value.substring(0, valueLength - 16); 63 msb = BluetoothMapUtils.getLongFromString(msbStr); 64 } 65 lsb = BluetoothMapUtils.getLongFromString(lsbStr); 66 return new SignedLongLong(lsb, msb); 67 } 68 69 @Override compareTo(SignedLongLong another)70 public int compareTo(SignedLongLong another) { 71 if (mMostSigBits == another.mMostSigBits) { 72 if (mLeastSigBits == another.mLeastSigBits) { 73 return 0; 74 } 75 if (mLeastSigBits < another.mLeastSigBits) { 76 return -1; 77 } 78 return 1; 79 } 80 if (mMostSigBits < another.mMostSigBits) { 81 return -1; 82 } 83 return 1; 84 } 85 86 @Override toString()87 public String toString() { 88 return toHexString(); 89 } 90 91 /** 92 * 93 * @return a hex-string representation of the object values 94 */ toHexString()95 public String toHexString() { 96 return BluetoothMapUtils.getLongLongAsString(mLeastSigBits, mMostSigBits); 97 } 98 99 @Override equals(Object obj)100 public boolean equals(Object obj) { 101 if (this == obj) { 102 return true; 103 } 104 if (obj == null) { 105 return false; 106 } 107 if (getClass() != obj.getClass()) { 108 return false; 109 } 110 SignedLongLong other = (SignedLongLong) obj; 111 if (mLeastSigBits != other.mLeastSigBits) { 112 return false; 113 } 114 if (mMostSigBits != other.mMostSigBits) { 115 return false; 116 } 117 return true; 118 } 119 getMostSignificantBits()120 public long getMostSignificantBits() { 121 return mMostSigBits; 122 } 123 getLeastSignificantBits()124 public long getLeastSignificantBits() { 125 return mLeastSigBits; 126 } 127 128 } 129