/* * Copyright (c) 1995, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *//*- *      Reads JPEG images from an InputStream and reports the *      image data to an InputStreamImageSource object. * * The native implementation of the JPEG image decoder was adapted from * release 6 of the free JPEG software from the Independent JPEG Group. */package sun.awt.image; import java.util.Vector;import java.util.Hashtable;import java.io.InputStream;import java.io.IOException;import java.awt.image.*; /** * JPEG Image converter * * @author Jim Graham */public class JPEGImageDecoder extends ImageDecoder {    private static ColorModel RGBcolormodel;    private static ColorModel ARGBcolormodel;    private static ColorModel Graycolormodel;     private static final Class InputStreamClass = InputStream.class;    private static native void initIDs(Class InputStreamClass);     private ColorModel colormodel;     static {        java.security.AccessController.doPrivileged(                  new sun.security.action.LoadLibraryAction("jpeg"));        initIDs(InputStreamClass);        RGBcolormodel = new DirectColorModel(24, 0xff0000, 0xff00, 0xff);        ARGBcolormodel = ColorModel.getRGBdefault();        byte g[] = new byte[256];        for (int i = 0; i < 256; i++) {            g[i] = (byte) i;        }        Graycolormodel = new IndexColorModel(8, 256, g, g, g);    }     private native void readImage(InputStream is, byte buf[])        throws ImageFormatException, IOException;     Hashtable props = new Hashtable();     public JPEGImageDecoder(InputStreamImageSource src, InputStream is) {        super(src, is);    }     /**     * An error has occurred. Throw an exception.     */    private static void error(String s1) throws ImageFormatException {        throw new ImageFormatException(s1);    }     public boolean sendHeaderInfo(int width, int height,                                  boolean gray, boolean hasalpha,                                  boolean multipass)    {        setDimensions(width, height);         setProperties(props);        if (gray) {            colormodel = Graycolormodel;        } else {            if (hasalpha) {                colormodel = ARGBcolormodel;            } else {                colormodel = RGBcolormodel;            }        }         setColorModel(colormodel);         int flags = hintflags;        if (!multipass) {            flags |= ImageConsumer.SINGLEPASS;        }        setHints(hintflags);        headerComplete();         return true;    }     public boolean sendPixels(int pixels[], int y) {        int count = setPixels(0, y, pixels.length, 1, colormodel,                              pixels, 0, pixels.length);        if (count <= 0) {            aborted = true;        }        return !aborted;    }     public boolean sendPixels(byte pixels[], int y) {        int count = setPixels(0, y, pixels.length, 1, colormodel,                              pixels, 0, pixels.length);        if (count <= 0) {            aborted = true;        }        return !aborted;    }     /**     * produce an image from the stream.     */    public void produceImage() throws IOException, ImageFormatException {        try {            readImage(input, new byte[1024]);            if (!aborted) {                imageComplete(ImageConsumer.STATICIMAGEDONE, true);            }        } catch (IOException e) {            if (!aborted) {                throw e;            }        } finally {            close();        }    }     /**     * The ImageConsumer hints flag for a JPEG image.     */    private static final int hintflags =        ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES |        ImageConsumer.SINGLEFRAME;}