org.jpedal.jbig2.util.BinaryOperation Maven / Gradle / Ivy
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/**
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.jpedal.org
* (C) Copyright 1997-2008, IDRsolutions and Contributors.
* Main Developer: Simon Barnett
*
* This file is part of JPedal
*
* Copyright (c) 2008, IDRsolutions
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the IDRsolutions nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY IDRsolutions ``AS IS'' AND ANY
* EXPRESS 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 IDRsolutions 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.
*
* Other JBIG2 image decoding implementations include
* jbig2dec (http://jbig2dec.sourceforge.net/)
* xpdf (http://www.foolabs.com/xpdf/)
*
* The final draft JBIG2 specification can be found at http://www.jpeg.org/public/fcd14492.pdf
*
* All three of the above resources were used in the writing of this software, with methodologies,
* processes and inspiration taken from all three.
*
* ---------------
* BinaryOperation.java
* ---------------
*/
package org.jpedal.jbig2.util;
public class BinaryOperation {
public static final int LEFT_SHIFT = 0;
public static final int RIGHT_SHIFT = 1;
public static final long LONGMASK = 0xffffffffl; // 1111 1111 1111 1111 1111 1111 1111 1111
public static final int INTMASK = 0xff; // 1111 1111
public final static int getInt32(final short[] number) {
return (number[0] << 24) | (number[1] << 16) | (number[2] << 8) | number[3];
}
public final static int getInt16(final short[] number) {
return (number[0] << 8) | number[1];
}
public final static long bit32ShiftL(long number, int shift) {
// return (number << shift) & LONGMASK;
return number << shift;
}
public final static long bit32ShiftR(long number, int shift) {
// return (number >> shift) & LONGMASK;
return number >> shift;
}
/*
* public final static long bit32Shift(long number, int shift, int direction) { if (direction == LEFT_SHIFT) number <<= shift; else number >>=
* shift; return (number & LONGMASK); }
*/
public final static int bit8Shift(int number, int shift, int direction) {
if (direction == LEFT_SHIFT) number <<= shift;
else number >>= shift;
return (number & INTMASK);
}
public final static int getInt32(final byte[] number) {
return (number[0] << 24) | (number[1] << 16) | (number[2] << 8) | number[3];
}
}