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ICEpdf core rendering library.
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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.
*
* ---------------
* JBIG2Decoder.java
* ---------------
 */
package org.jpedal.jbig2;

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;

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.*;
import java.util.Iterator;
import java.util.List;

public class JBIG2Decoder {

    private JBIG2StreamDecoder streamDecoder;

    /**
     * Constructor
     */
    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(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(byte[] data) throws IOException, JBIG2Exception {
        streamDecoder.decodeJBIG2(data);
    }

    public void cleanupPostDecode() {
        streamDecoder.cleanupPostDecode();
    }

    /**
     * @param page
     * @return
     */
    public BufferedImage getPageAsBufferedImage(int page) {
        page++;
        JBIG2Bitmap pageBitmap = streamDecoder.findPageSegement(page).getPageBitmap();

        /*
         * Initial optimisation attempt, replaced with further efforts, below
        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);

        // Don't make a deep copy, since pageBitmap.getData(boolean)
        // just allocated the byte[] for us
        byte[] copy = bytes;

        // byte[] data = pageBitmap.getData(true).clone();
        int width = pageBitmap.getWidth();
        int height = pageBitmap.getHeight();

        // create an image from the raw data
        DataBuffer db = new DataBufferByte(copy, copy.length);

        WritableRaster raster = Raster.createPackedRaster(db, width, height, 1, null);
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_BINARY);
        image.setData(raster);
        */


        // byte[] data = pageBitmap.getData(true).clone();
        int width = pageBitmap.getWidth();
        int height = pageBitmap.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_BINARY);
        byte[] bytes = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
        pageBitmap.getData(bytes, true);

        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();
    }
}