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JBIG2Decoder.java

/**
* ===========================================
* 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
       */
      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);
      }

      /**
       * 
       * @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();

            /** 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);


            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();
      }
}

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