org.jpedal.jbig2.segment.pageinformation.PageInformationSegment Maven / Gradle / Ivy
/**
* ===========================================
* 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.
*
* ---------------
* PageInformationSegment.java
* ---------------
*/
package org.jpedal.jbig2.segment.pageinformation;
import org.jpedal.jbig2.JBIG2Exception;
import org.jpedal.jbig2.decoders.JBIG2StreamDecoder;
import org.jpedal.jbig2.image.JBIG2Bitmap;
import org.jpedal.jbig2.segment.Segment;
import org.jpedal.jbig2.util.BinaryOperation;
import java.io.IOException;
public class PageInformationSegment extends Segment {
private int pageBitmapHeight, pageBitmapWidth;
private int yResolution, xResolution;
PageInformationFlags pageInformationFlags = new PageInformationFlags();
private int pageStriping;
private JBIG2Bitmap pageBitmap;
public PageInformationSegment(JBIG2StreamDecoder streamDecoder) {
super(streamDecoder);
}
public PageInformationFlags getPageInformationFlags() {
return pageInformationFlags;
}
public JBIG2Bitmap getPageBitmap() {
return pageBitmap;
}
public void readSegment() throws IOException, JBIG2Exception {
if (JBIG2StreamDecoder.debug)
System.out.println("==== Reading Page Information Dictionary ====");
short[] buff = new short[4];
decoder.readByte(buff);
pageBitmapWidth = BinaryOperation.getInt32(buff);
buff = new short[4];
decoder.readByte(buff);
pageBitmapHeight = BinaryOperation.getInt32(buff);
if (JBIG2StreamDecoder.debug)
System.out.println("Bitmap size = " + pageBitmapWidth + 'x' + pageBitmapHeight);
buff = new short[4];
decoder.readByte(buff);
xResolution = BinaryOperation.getInt32(buff);
buff = new short[4];
decoder.readByte(buff);
yResolution = BinaryOperation.getInt32(buff);
if (JBIG2StreamDecoder.debug)
System.out.println("Resolution = " + xResolution + 'x' + yResolution);
/** extract page information flags */
short pageInformationFlagsField = decoder.readByte();
pageInformationFlags.setFlags(pageInformationFlagsField);
if (JBIG2StreamDecoder.debug)
System.out.println("symbolDictionaryFlags = " + pageInformationFlagsField);
buff = new short[2];
decoder.readByte(buff);
pageStriping = BinaryOperation.getInt16(buff);
if (JBIG2StreamDecoder.debug)
System.out.println("Page Striping = " + pageStriping);
int defPix = pageInformationFlags.getFlagValue(PageInformationFlags.DEFAULT_PIXEL_VALUE);
int height;
if (pageBitmapHeight == -1) {
height = pageStriping & 0x7fff;
} else {
height = pageBitmapHeight;
}
pageBitmap = new JBIG2Bitmap(pageBitmapWidth, height, arithmeticDecoder, huffmanDecoder, mmrDecoder);
pageBitmap.clear(defPix);
}
public int getPageBitmapHeight() {
return pageBitmapHeight;
}
}