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 import java.util.Objects; 23 24 /** 25 * Class to represent a 128bit value using two long member variables. 26 * Has functionality to convert to/from hex-strings. 27 * Mind that since signed variables are used to store the value internally 28 * is used, the MSB/LSB long values can be negative. 29 */ 30 public class SignedLongLong implements Comparable<SignedLongLong> { 31 32 private long mMostSigBits; 33 private long mLeastSigBits; 34 SignedLongLong(long leastSigBits, long mostSigBits)35 public SignedLongLong(long leastSigBits, long mostSigBits) { 36 this.mMostSigBits = mostSigBits; 37 this.mLeastSigBits = leastSigBits; 38 } 39 40 /** 41 * Create a SignedLongLong from a Hex-String without "0x" prefix 42 * @param value the hex-string 43 * @return the created object 44 * @throws UnsupportedEncodingException if "US-ASCII" charset is not supported, 45 * @throws NullPointerException if the string {@code value} is null, 46 * @throws NumberFormatException if the string {@code value} contains invalid characters. 47 */ fromString(String value)48 public static SignedLongLong fromString(String value) throws UnsupportedEncodingException { 49 String lsbStr, msbStr; 50 long msb = 0; 51 52 lsbStr = msbStr = null; 53 if (value == null) { 54 throw new NullPointerException(); 55 } 56 value = value.trim(); 57 int valueLength = value.length(); 58 if (valueLength == 0 || valueLength > 32) { 59 throw new NumberFormatException("invalid string length: " + valueLength); 60 } 61 if (valueLength <= 16) { 62 lsbStr = value; 63 } else { 64 lsbStr = value.substring(valueLength - 16, valueLength); 65 msbStr = value.substring(0, valueLength - 16); 66 msb = BluetoothMapUtils.getLongFromString(msbStr); 67 } 68 long lsb = BluetoothMapUtils.getLongFromString(lsbStr); 69 return new SignedLongLong(lsb, msb); 70 } 71 72 @Override compareTo(SignedLongLong another)73 public int compareTo(SignedLongLong another) { 74 if (mMostSigBits == another.mMostSigBits) { 75 if (mLeastSigBits == another.mLeastSigBits) { 76 return 0; 77 } 78 if (mLeastSigBits < another.mLeastSigBits) { 79 return -1; 80 } 81 return 1; 82 } 83 if (mMostSigBits < another.mMostSigBits) { 84 return -1; 85 } 86 return 1; 87 } 88 89 @Override toString()90 public String toString() { 91 return toHexString(); 92 } 93 94 /** 95 * 96 * @return a hex-string representation of the object values 97 */ toHexString()98 public String toHexString() { 99 return BluetoothMapUtils.getLongLongAsString(mLeastSigBits, mMostSigBits); 100 } 101 102 @Override equals(Object obj)103 public boolean equals(Object obj) { 104 if (this == obj) { 105 return true; 106 } 107 if (obj == null) { 108 return false; 109 } 110 if (!(obj instanceof SignedLongLong)) { 111 return false; 112 } 113 SignedLongLong other = (SignedLongLong) obj; 114 if (mLeastSigBits != other.mLeastSigBits) { 115 return false; 116 } 117 if (mMostSigBits != other.mMostSigBits) { 118 return false; 119 } 120 return true; 121 } 122 123 @Override hashCode()124 public int hashCode() { 125 return Objects.hash(mLeastSigBits, mMostSigBits); 126 } 127 getMostSignificantBits()128 public long getMostSignificantBits() { 129 return mMostSigBits; 130 } 131 getLeastSignificantBits()132 public long getLeastSignificantBits() { 133 return mLeastSigBits; 134 } 135 136 } 137