Tuesday, 24 October 2017
arrow Previous Versions arrow JDiceLock 6.0.0.1 arrow ArithmeticFunctions.java
ArithmeticFunctions.java (arithmetic functions Java source code file) Print E-mail
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//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.6.0.0.1
//
// Copyright (C) 2011-2012 DiceLock Security, LLC. All rights reserved.
//
//                               DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// DICELOCK IS A REGISTERED TRADEMARK OR TRADEMARK OF THE OWNERS.
//
// Environment:
// java version "1.6.0_29"
// Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
// Java HotSpot(TM) Server VM (build 20.4-b02, mixed mode)
//
 
package com.dicelocksecurity.jdicelock;
 
/**
 * Class implementing arithmetic functions for random number tests
 *
 * @author      Angel Ferré @ DiceLock Security
 * @version     6.0.0.1
 * @since       2011-09-30
 */
public class ArithmeticFunctions {
 
    /**
     * Constructor, default
     */
    public ArithmeticFunctions() {
        super();
    }
 
    /**
     * Destructor
     */
    public void finalize() {
 
    }
 
    /**
     * Inidicates if the addition of two unsigned chars produces overflow
     * false -> no overflow, true -> addition produces overflow
     */
    public boolean SumUCIsOverflow(byte a, byte b) {
        short x, y;
 
        x = (short)(a & 0x00FF);
        y = (short)(b & 0x00FF);
        return (((x + y) >> 8) != 0);
    }
 
    /**
     * Indicates if the addition of three unsigned chars produces overflow
     * false -> no overflow, true -> addition produces overflow
     */
    public boolean SumUCIsOverflow(byte a, byte b, byte c) {
        short x, y, z;
 
        x = (short)(a & 0x00FF);
        y = (short)(b & 0x00FF);
        z = (short)(c & 0x00FF);
        return ((((x + y + z)) >> 8) != 0);
    }
 
    /**
     * Inidicates if the addition of two unsigned short ints produces overflow
     * false -> no overflow, true -> addition produces overflow
     */
    public boolean SumUSIsOverflow(short a, short b) {
        int x, y;
 
        x = (int)(a & 0x0000FFFF);
        y = (int)(b & 0x0000FFFF);
        return (((x + y) >> 15) != 0);
    }
 
    /**
     * Indicates if the addition of three unsigned short ints produces overflow
     * false -> no overflow, true -> addition produces overflow
     */
    public boolean SumUSIsOverflow(short a, short b, short c) {
        int x, y, z;
 
        x = (int)(a & 0x0000FFFF);
        y = (int)(b & 0x0000FFFF);
        z = (int)(c & 0x0000FFFF);
        return (((x + y + z) >> 15) != 0);
    }
 
}