/* DecodeRLE8.java --   Copyright (C)  2005  Free Software Foundation, Inc.This file is part of GNU Classpath.GNU Classpath is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2, or (at your option)any later version.GNU Classpath is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU Classpath; see the file COPYING.  If not, write to theFree Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA02110-1301 USA.Linking this library statically or dynamically with other modules ismaking a combined work based on this library.  Thus, the terms andconditions of the GNU General Public License cover the wholecombination.As a special exception, the copyright holders of this library give youpermission to link this library with independent modules to produce anexecutable, regardless of the license terms of these independentmodules, and to copy and distribute the resulting executable underterms of your choice, provided that you also meet, for each linkedindependent module, the terms and conditions of the license of thatmodule.  An independent module is a module which is not derived fromor based on this library.  If you modify this library, you may extendthis exception to your version of the library, but you are notobligated to do so.  If you do not wish to do so, delete thisexception statement from your version. */package gnu.javax.imageio.bmp;import java.io.IOException;import javax.imageio.stream.ImageInputStream;import java.awt.image.BufferedImage;import java.awt.image.IndexColorModel;import java.awt.image.Raster;import java.awt.image.WritableRaster;import java.awt.image.DataBuffer;import java.awt.image.DataBufferByte;import java.awt.image.SinglePixelPackedSampleModel;import java.awt.image.SampleModel;import java.awt.Dimension;public class DecodeRLE8 extends BMPDecoder {    public DecodeRLE8(BMPFileHeader fh, BMPInfoHeader ih){	super(fh, ih);    }    /**     * RLE control codes     */    private static final byte ESCAPE = (byte)0;    private static final byte EOL = (byte)0; // end of line    private static final byte EOB = (byte)1; // end of bitmap    private static final byte DELTA = (byte)2; // delta        public BufferedImage decode(ImageInputStream in) throws IOException, BMPException {	IndexColorModel palette = readPalette(in);	skipToImage(in);	Dimension d = infoHeader.getSize();	int h = (int)d.getHeight();	int w = (int)d.getWidth();	byte[] data = uncompress(w, h, in);	SampleModel sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE, 							  w, h, 							  new int[] {0xFF});	DataBuffer db = new DataBufferByte(data, w*h, 0);	WritableRaster raster = Raster.createWritableRaster(sm, db, null);    	return new BufferedImage(palette, raster, false, null);    }        private byte[] uncompress(int w, int h, ImageInputStream in) 	throws BMPException, IOException {	byte[] cmd = new byte[2];	byte[] data = new byte[w*h];	int offIn = 0;	int x=0,y=0;	try {	    while((x + y*w) < w*h){		if(in.read(cmd) != 2)		    throw new IOException("Error reading compressed data.");		if(cmd[0] == ESCAPE){		    switch(cmd[1]){		    case EOB: // end of bitmap			return data;		    case EOL: // end of line			x = 0;			y++;			break;		    case DELTA: // delta			if(in.read(cmd) != 2)			    throw new IOException("Error reading compressed data.");			int dx = cmd[0] & (0xFF);			int dy = cmd[1] & (0xFF);			x += dx;			y += dy;			break;					    default:			// decode a literal run			int length = cmd[1] & (0xFF);			int copylength = length;			// absolute mode must be word-aligned			length += (length & 1);			byte[] run = new byte[length];			if(in.read(run) != length)			    throw new IOException("Error reading compressed data.");			System.arraycopy(run, 0, data, (x+w*(h-y-1)), 					 copylength);			x += copylength;			break;		    }		} else {		    // decode a byte run		    int length = cmd[0] & (0xFF);		    for(int i=0;i<length;i++)			data[(h-y-1)*w + x++] = cmd[1];		}	    }	    return data; 	} catch(ArrayIndexOutOfBoundsException e){ 	    throw new BMPException("Invalid RLE data."); 	}    }}