1 /* 2 * Copyright 2012, Google Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * * Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following disclaimer 13 * in the documentation and/or other materials provided with the 14 * distribution. 15 * * Neither the name of Google Inc. nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 package org.jf.util; 33 34 public abstract class NibbleUtils { 35 /** 36 * Extracts the high signed 4-bit nibble from the least significant 37 * byte of the given value 38 * @param value the value to extract the nibble from 39 * @return the extracted signed nibble value 40 */ extractHighSignedNibble(int value)41 public static int extractHighSignedNibble(int value) { 42 return (value << 24) >> 28; 43 } 44 45 /** 46 * Extracts the low signed 4-bit nibble from the least significant 47 * byte of the given value 48 * @param value the value to extract the nibble from 49 * @return the extracted signed nibble value 50 */ extractLowSignedNibble(int value)51 public static int extractLowSignedNibble(int value) { 52 return (value << 28) >> 28; 53 } 54 55 /** 56 * Extracts the high unsigned 4-bit nibble from the least significant 57 * byte of the given value 58 * @param value the value to extract the nibble from 59 * @return the extracted unsigned nibble value 60 */ extractHighUnsignedNibble(int value)61 public static int extractHighUnsignedNibble(int value) { 62 return (value & 0xF0) >>> 4; 63 } 64 65 /** 66 * Extracts the low unsigned 4-bit nibble from the least significant 67 * byte of the given value 68 * @param value the value to extract the nibble from 69 * @return the extracted unsigned nibble value 70 */ extractLowUnsignedNibble(int value)71 public static int extractLowUnsignedNibble(int value) { 72 return value & 0x0F; 73 } 74 } 75