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      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      */
     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      */
     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      */
     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      */
     71     public static int extractLowUnsignedNibble(int value) {
     72         return value & 0x0F;
     73     }
     74 }
     75