/*

 * Copyright (c) 2001, 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.

 */

package com.sun.imageio.plugins.jpeg;

import javax.imageio.IIOException;

import javax.imageio.metadata.IIOInvalidTreeException;

import javax.imageio.metadata.IIOMetadataNode;

import javax.imageio.stream.ImageOutputStream;

import java.io.IOException;

import org.w3c.dom.Node;

import org.w3c.dom.NamedNodeMap;

/**

 * An Adobe APP14 (Application-Specific) marker segment.

 */

class AdobeMarkerSegment extends MarkerSegment {

    int version;

    int flags0;

    int flags1;

    int transform;

    private static final int ID_SIZE = 5;

    AdobeMarkerSegment(int transform) {

        super(JPEG.APP14);

        version = 101;

        flags0 = 0;

        flags1 = 0;

        this.transform = transform;

    }

    AdobeMarkerSegment(JPEGBuffer buffer) throws IOException {

        super(buffer);

        buffer.bufPtr += ID_SIZE; // Skip the id

        version = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;

        version |= buffer.buf[buffer.bufPtr++] & 0xff;

        flags0 = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;

        flags0 |= buffer.buf[buffer.bufPtr++] & 0xff;

        flags1 = (buffer.buf[buffer.bufPtr++] & 0xff) << 8;

        flags1 |= buffer.buf[buffer.bufPtr++] & 0xff;

        transform = buffer.buf[buffer.bufPtr++] & 0xff;

        buffer.bufAvail -= length;

    }

    AdobeMarkerSegment(Node node) throws IIOInvalidTreeException {

        this(0); // default transform will be changed

        updateFromNativeNode(node, true);

    }

    IIOMetadataNode getNativeNode() {

        IIOMetadataNode node = new IIOMetadataNode("app14Adobe");

        node.setAttribute("version", Integer.toString(version));

        node.setAttribute("flags0", Integer.toString(flags0));

        node.setAttribute("flags1", Integer.toString(flags1));

        node.setAttribute("transform", Integer.toString(transform));

        return node;

    }

    void updateFromNativeNode(Node node, boolean fromScratch)

        throws IIOInvalidTreeException {

        // Only the transform is required

        NamedNodeMap attrs = node.getAttributes();

        transform = getAttributeValue(node, attrs, "transform", 0, 2, true);

        int count = attrs.getLength();

        if (count > 4) {

            throw new IIOInvalidTreeException

                ("Adobe APP14 node cannot have > 4 attributes", node);

        }

        if (count > 1) {

            int value = getAttributeValue(node, attrs, "version",

                                          100, 255, false);

            version = (value != -1) ? value : version;

            value = getAttributeValue(node, attrs, "flags0", 0, 65535, false);

            flags0 = (value != -1) ? value : flags0;

            value = getAttributeValue(node, attrs, "flags1", 0, 65535, false);

            flags1 = (value != -1) ? value : flags1;

        }

    }

    /**

     * Writes the data for this segment to the stream in

     * valid JPEG format.

     */

    void write(ImageOutputStream ios) throws IOException {

        length = 14;

        writeTag(ios);

        byte [] id = {0x41, 0x64, 0x6F, 0x62, 0x65};

        ios.write(id);

        write2bytes(ios, version);

        write2bytes(ios, flags0);

        write2bytes(ios, flags1);

        ios.write(transform);

    }

    static void writeAdobeSegment(ImageOutputStream ios, int transform)

        throws IOException {

        (new AdobeMarkerSegment(transform)).write(ios);

    }

    void print () {

        printTag("Adobe APP14");

        System.out.print("Version: ");

        System.out.println(version);

        System.out.print("Flags0: 0x");

        System.out.println(Integer.toHexString(flags0));

        System.out.print("Flags1: 0x");

        System.out.println(Integer.toHexString(flags1));

        System.out.print("Transform: ");

        System.out.println(transform);

    }

}