org.jpedal.jbig2.JBIG2Decoder 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.
*
* ---------------
* JBIG2Decoder.java
* ---------------
*/
package org.jpedal.jbig2;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.io.DataInput;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;
import org.jpedal.jbig2.decoders.JBIG2StreamDecoder;
import org.jpedal.jbig2.image.JBIG2Bitmap;
import org.jpedal.jbig2.segment.Segment;
import org.jpedal.jbig2.segment.pageinformation.PageInformationSegment;
public class JBIG2Decoder {
private JBIG2StreamDecoder streamDecoder;
/**
* Constructor for jbig
*/
public JBIG2Decoder() {
streamDecoder = new JBIG2StreamDecoder();
}
/**
* If the data stream is taken from a PDF, there may be some global data. Pass any global data
* in here. Call this method before decodeJBIG2(...)
* @param data global data
* @throws IOException
* @throws JBIG2Exception
*/
public void setGlobalData(final byte[] data) throws IOException, JBIG2Exception {
streamDecoder.setGlobalData(data);
}
/**
* Decodes a JBIG2 image from a File object
* @param file File to decode
* @throws IOException
* @throws JBIG2Exception
*/
public void decodeJBIG2(File file) throws IOException, JBIG2Exception {
decodeJBIG2(file.getAbsolutePath());
}
/**
* Decodes a JBIG2 image from a String path
* @param file Must be the full path to the image
* @throws IOException
* @throws JBIG2Exception
*/
public void decodeJBIG2(String file) throws IOException, JBIG2Exception {
decodeJBIG2(new FileInputStream(file));
}
/**
* Decodes a JBIG2 image from an InputStream
* @param inputStream InputStream
* @throws IOException
* @throws JBIG2Exception
*/
public void decodeJBIG2(InputStream inputStream) throws IOException, JBIG2Exception {
int availiable = inputStream.available();
byte[] bytes = new byte[availiable];
inputStream.read(bytes);
decodeJBIG2(bytes);
}
/**
* Decodes a JBIG2 image from a DataInput
* @param dataInput DataInput
* @throws IOException
* @throws JBIG2Exception
*/
public void decodeJBIG2(DataInput dataInput) throws IOException, JBIG2Exception {
// long availiable = inputStream.length();
//
// byte[] bytes = new byte[availiable];
// inputStream.read(bytes);
//
// decodeJBIG2(bytes);
}
/**
* Decodes a JBIG2 image from a byte array
* @param data the raw data stream
* @throws IOException
* @throws JBIG2Exception
*/
public void decodeJBIG2(final byte[] data) throws IOException, JBIG2Exception {
streamDecoder.decodeJBIG2(data);
}
/**
*
* @param page
* @return
*/
public BufferedImage getPageAsBufferedImage(int page) {
page++;
JBIG2Bitmap pageBitmap = streamDecoder.findPageSegement(page).getPageBitmap();
byte[] bytes = pageBitmap.getData(true);
if (bytes == null)
return null;
// make a a DEEP copy so we cant alter
int len = bytes.length;
byte[] copy = new byte[len];
System.arraycopy(bytes, 0, copy, 0, len);
// byte[] data = pageBitmap.getData(true).clone();
int width = pageBitmap.getWidth();
int height = pageBitmap.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_BINARY);
/** create an image from the raw data */
DataBuffer db = new DataBufferByte(copy, copy.length);
WritableRaster raster = Raster.createPackedRaster(db, width, height, 1, null);
image.setData(raster);
return image;
}
public boolean isNumberOfPagesKnown() {
return streamDecoder.isNumberOfPagesKnown();
}
public int getNumberOfPages() {
int pages = streamDecoder.getNumberOfPages();
if (streamDecoder.isNumberOfPagesKnown() && pages != 0)
return pages;
int noOfPages = 0;
List segments = getAllSegments();
for (Iterator it = segments.iterator(); it.hasNext(); ) {
Segment segment = (Segment) it.next();
if (segment.getSegmentHeader().getSegmentType() == Segment.PAGE_INFORMATION)
noOfPages++;
}
return noOfPages;
}
public List getAllSegments() {
return streamDecoder.getAllSegments();
}
public PageInformationSegment findPageSegement(int page) {
page++;
return streamDecoder.findPageSegement(page);
}
public Segment findSegment(int segmentNumber) {
return streamDecoder.findSegment(segmentNumber);
}
public JBIG2Bitmap getPageAsJBIG2Bitmap(int page) {
page++;
return streamDecoder.findPageSegement(page).getPageBitmap();
}
public boolean isRandomAccessOrganisationUsed() {
return streamDecoder.isRandomAccessOrganisationUsed();
}
}