ojluni/src/main/java/com/sun/imageio/plugins/gif/GIFImageMetadata.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2000, 2005, 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.gif;

 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import javax.imageio.ImageTypeSpecifier;
 import javax.imageio.metadata.IIOInvalidTreeException;
 import javax.imageio.metadata.IIOMetadata;
 import javax.imageio.metadata.IIOMetadataNode;
 import javax.imageio.metadata.IIOMetadataFormat;
 import javax.imageio.metadata.IIOMetadataFormatImpl;
 import org.w3c.dom.Node;

 public class GIFImageMetadata extends GIFMetadata {

     // package scope
     static final String
         nativeMetadataFormatName = "javax_imageio_gif_image_1.0";

     static final String[] disposalMethodNames = {
         "none",
         "doNotDispose",
         "restoreToBackgroundColor",
         "restoreToPrevious",
         "undefinedDisposalMethod4",
         "undefinedDisposalMethod5",
         "undefinedDisposalMethod6",
         "undefinedDisposalMethod7"
     };

     // Fields from Image Descriptor
     public int imageLeftPosition;
     public int imageTopPosition;
     public int imageWidth;
     public int imageHeight;
     public boolean interlaceFlag = false;
     public boolean sortFlag = false;
     public byte[] localColorTable = null;

     // Fields from Graphic Control Extension
     public int disposalMethod = 0;
     public boolean userInputFlag = false;
     public boolean transparentColorFlag = false;
     public int delayTime = 0;
     public int transparentColorIndex = 0;

     // Fields from Plain Text Extension
     public boolean hasPlainTextExtension = false;
     public int textGridLeft;
     public int textGridTop;
     public int textGridWidth;
     public int textGridHeight;
     public int characterCellWidth;
     public int characterCellHeight;
     public int textForegroundColor;
     public int textBackgroundColor;
     public byte[] text;

     // Fields from ApplicationExtension
     // List of byte[]
     public List applicationIDs = null; // new ArrayList();

     // List of byte[]
     public List authenticationCodes = null; // new ArrayList();

     // List of byte[]
     public List applicationData = null; // new ArrayList();

     // Fields from CommentExtension
     // List of byte[]
     public List comments = null; // new ArrayList();

     protected GIFImageMetadata(boolean standardMetadataFormatSupported,
                                String nativeMetadataFormatName,
                                String nativeMetadataFormatClassName,
                                String[] extraMetadataFormatNames,
                                String[] extraMetadataFormatClassNames)
     {
         super(standardMetadataFormatSupported,
               nativeMetadataFormatName,
               nativeMetadataFormatClassName,
               extraMetadataFormatNames,
               extraMetadataFormatClassNames);
     }

     public GIFImageMetadata() {
         this(true,
               nativeMetadataFormatName,
               "com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
               null, null);
     }

     public boolean isReadOnly() {
         return true;
     }

     public Node getAsTree(String formatName) {
         if (formatName.equals(nativeMetadataFormatName)) {
             return getNativeTree();
         } else if (formatName.equals
                    (IIOMetadataFormatImpl.standardMetadataFormatName)) {
             return getStandardTree();
         } else {
             throw new IllegalArgumentException("Not a recognized format!");
         }
     }

     private String toISO8859(byte[] data) {
         try {
             return new String(data, "ISO-8859-1");
         } catch (UnsupportedEncodingException e) {
             return "";
         }
     }

     private Node getNativeTree() {
         IIOMetadataNode node; // scratch node
         IIOMetadataNode root =
             new IIOMetadataNode(nativeMetadataFormatName);

         // Image descriptor
         node = new IIOMetadataNode("ImageDescriptor");
         node.setAttribute("imageLeftPosition",
                           Integer.toString(imageLeftPosition));
         node.setAttribute("imageTopPosition",
                           Integer.toString(imageTopPosition));
         node.setAttribute("imageWidth", Integer.toString(imageWidth));
         node.setAttribute("imageHeight", Integer.toString(imageHeight));
         node.setAttribute("interlaceFlag",
                           interlaceFlag ? "TRUE" : "FALSE");
         root.appendChild(node);

         // Local color table
         if (localColorTable != null) {
             node = new IIOMetadataNode("LocalColorTable");
             int numEntries = localColorTable.length/3;
             node.setAttribute("sizeOfLocalColorTable",
                               Integer.toString(numEntries));
             node.setAttribute("sortFlag",
                               sortFlag ? "TRUE" : "FALSE");

             for (int i = 0; i < numEntries; i++) {
                 IIOMetadataNode entry =
                     new IIOMetadataNode("ColorTableEntry");
                 entry.setAttribute("index", Integer.toString(i));
                 int r = localColorTable[3*i] & 0xff;
                 int g = localColorTable[3*i + 1] & 0xff;
                 int b = localColorTable[3*i + 2] & 0xff;
                 entry.setAttribute("red", Integer.toString(r));
                 entry.setAttribute("green", Integer.toString(g));
                 entry.setAttribute("blue", Integer.toString(b));
                 node.appendChild(entry);
             }
             root.appendChild(node);
         }

         // Graphic control extension
         node = new IIOMetadataNode("GraphicControlExtension");
         node.setAttribute("disposalMethod",
                           disposalMethodNames[disposalMethod]);
         node.setAttribute("userInputFlag",
                           userInputFlag ? "TRUE" : "FALSE");
         node.setAttribute("transparentColorFlag",
                           transparentColorFlag ? "TRUE" : "FALSE");
         node.setAttribute("delayTime",
                           Integer.toString(delayTime));
         node.setAttribute("transparentColorIndex",
                           Integer.toString(transparentColorIndex));
         root.appendChild(node);

         if (hasPlainTextExtension) {
             node = new IIOMetadataNode("PlainTextExtension");
             node.setAttribute("textGridLeft",
                               Integer.toString(textGridLeft));
             node.setAttribute("textGridTop",
                               Integer.toString(textGridTop));
             node.setAttribute("textGridWidth",
                               Integer.toString(textGridWidth));
             node.setAttribute("textGridHeight",
                               Integer.toString(textGridHeight));
             node.setAttribute("characterCellWidth",
                               Integer.toString(characterCellWidth));
             node.setAttribute("characterCellHeight",
                               Integer.toString(characterCellHeight));
             node.setAttribute("textForegroundColor",
                               Integer.toString(textForegroundColor));
             node.setAttribute("textBackgroundColor",
                               Integer.toString(textBackgroundColor));
             node.setAttribute("text", toISO8859(text));

             root.appendChild(node);
         }

         // Application extensions
         int numAppExtensions = applicationIDs == null ?
             0 : applicationIDs.size();
         if (numAppExtensions > 0) {
             node = new IIOMetadataNode("ApplicationExtensions");
             for (int i = 0; i < numAppExtensions; i++) {
                 IIOMetadataNode appExtNode =
                     new IIOMetadataNode("ApplicationExtension");
                 byte[] applicationID = (byte[])applicationIDs.get(i);
                 appExtNode.setAttribute("applicationID",
                                         toISO8859(applicationID));
                 byte[] authenticationCode = (byte[])authenticationCodes.get(i);
                 appExtNode.setAttribute("authenticationCode",
                                         toISO8859(authenticationCode));
                 byte[] appData = (byte[])applicationData.get(i);
                 appExtNode.setUserObject((byte[])appData.clone());
                 node.appendChild(appExtNode);
             }

             root.appendChild(node);
         }

         // Comment extensions
         int numComments = comments == null ? 0 : comments.size();
         if (numComments > 0) {
             node = new IIOMetadataNode("CommentExtensions");
             for (int i = 0; i < numComments; i++) {
                 IIOMetadataNode commentNode =
                     new IIOMetadataNode("CommentExtension");
                 byte[] comment = (byte[])comments.get(i);
                 commentNode.setAttribute("value", toISO8859(comment));
                 node.appendChild(commentNode);
             }

             root.appendChild(node);
         }

         return root;
     }

     public IIOMetadataNode getStandardChromaNode() {
         IIOMetadataNode chroma_node = new IIOMetadataNode("Chroma");
         IIOMetadataNode node = null; // scratch node

         node = new IIOMetadataNode("ColorSpaceType");
         node.setAttribute("name", "RGB");
         chroma_node.appendChild(node);

         node = new IIOMetadataNode("NumChannels");
         node.setAttribute("value", transparentColorFlag ? "4" : "3");
         chroma_node.appendChild(node);

         // Gamma not in format

         node = new IIOMetadataNode("BlackIsZero");
         node.setAttribute("value", "TRUE");
         chroma_node.appendChild(node);

         if (localColorTable != null) {
             node = new IIOMetadataNode("Palette");
             int numEntries = localColorTable.length/3;
             for (int i = 0; i < numEntries; i++) {
                 IIOMetadataNode entry =
                     new IIOMetadataNode("PaletteEntry");
                 entry.setAttribute("index", Integer.toString(i));
                 entry.setAttribute("red",
                            Integer.toString(localColorTable[3*i] & 0xff));
                 entry.setAttribute("green",
                            Integer.toString(localColorTable[3*i + 1] & 0xff));
                 entry.setAttribute("blue",
                            Integer.toString(localColorTable[3*i + 2] & 0xff));
                 node.appendChild(entry);
             }
             chroma_node.appendChild(node);
         }

         // BackgroundIndex not in image
         // BackgroundColor not in format

         return chroma_node;
     }

     public IIOMetadataNode getStandardCompressionNode() {
         IIOMetadataNode compression_node = new IIOMetadataNode("Compression");
         IIOMetadataNode node = null; // scratch node

         node = new IIOMetadataNode("CompressionTypeName");
         node.setAttribute("value", "lzw");
         compression_node.appendChild(node);

         node = new IIOMetadataNode("Lossless");
         node.setAttribute("value", "TRUE");
         compression_node.appendChild(node);

         node = new IIOMetadataNode("NumProgressiveScans");
         node.setAttribute("value", interlaceFlag ? "4" : "1");
         compression_node.appendChild(node);

         // BitRate not in format

         return compression_node;
     }

     public IIOMetadataNode getStandardDataNode() {
         IIOMetadataNode data_node = new IIOMetadataNode("Data");
         IIOMetadataNode node = null; // scratch node

         // PlanarConfiguration not in format

         node = new IIOMetadataNode("SampleFormat");
         node.setAttribute("value", "Index");
         data_node.appendChild(node);

         // BitsPerSample not in image
         // SignificantBitsPerSample not in format
         // SampleMSB not in format

         return data_node;
     }

     public IIOMetadataNode getStandardDimensionNode() {
         IIOMetadataNode dimension_node = new IIOMetadataNode("Dimension");
         IIOMetadataNode node = null; // scratch node

         // PixelAspectRatio not in image

         node = new IIOMetadataNode("ImageOrientation");
         node.setAttribute("value", "Normal");
         dimension_node.appendChild(node);

         // HorizontalPixelSize not in format
         // VerticalPixelSize not in format
         // HorizontalPhysicalPixelSpacing not in format
         // VerticalPhysicalPixelSpacing not in format
         // HorizontalPosition not in format
         // VerticalPosition not in format

         node = new IIOMetadataNode("HorizontalPixelOffset");
         node.setAttribute("value", Integer.toString(imageLeftPosition));
         dimension_node.appendChild(node);

         node = new IIOMetadataNode("VerticalPixelOffset");
         node.setAttribute("value", Integer.toString(imageTopPosition));
         dimension_node.appendChild(node);

         // HorizontalScreenSize not in image
         // VerticalScreenSize not in image

         return dimension_node;
     }

     // Document not in image

     public IIOMetadataNode getStandardTextNode() {
         if (comments == null) {
             return null;
         }
         Iterator commentIter = comments.iterator();
         if (!commentIter.hasNext()) {
             return null;
         }

         IIOMetadataNode text_node = new IIOMetadataNode("Text");
         IIOMetadataNode node = null; // scratch node

         while (commentIter.hasNext()) {
             byte[] comment = (byte[])commentIter.next();
             String s = null;
             try {
                 s = new String(comment, "ISO-8859-1");
             } catch (UnsupportedEncodingException e) {
                 throw new RuntimeException("Encoding ISO-8859-1 unknown!");
             }

             node = new IIOMetadataNode("TextEntry");
             node.setAttribute("value", s);
             node.setAttribute("encoding", "ISO-8859-1");
             node.setAttribute("compression", "none");
             text_node.appendChild(node);
         }

         return text_node;
     }

     public IIOMetadataNode getStandardTransparencyNode() {
         if (!transparentColorFlag) {
             return null;
         }

         IIOMetadataNode transparency_node =
             new IIOMetadataNode("Transparency");
         IIOMetadataNode node = null; // scratch node

         // Alpha not in format

         node = new IIOMetadataNode("TransparentIndex");
         node.setAttribute("value",
                           Integer.toString(transparentColorIndex));
         transparency_node.appendChild(node);

         // TransparentColor not in format
         // TileTransparencies not in format
         // TileOpacities not in format

         return transparency_node;
     }

     public void setFromTree(String formatName, Node root)
         throws IIOInvalidTreeException
     {
         throw new IllegalStateException("Metadata is read-only!");
     }

     protected void mergeNativeTree(Node root) throws IIOInvalidTreeException
     {
         throw new IllegalStateException("Metadata is read-only!");
     }

     protected void mergeStandardTree(Node root) throws IIOInvalidTreeException
     {
         throw new IllegalStateException("Metadata is read-only!");
     }

     public void reset() {
         throw new IllegalStateException("Metadata is read-only!");
     }
 }
	/*
	* Copyright (c) 2000, 2005, 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.gif;

	import java.io.UnsupportedEncodingException;
	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;
	import javax.imageio.ImageTypeSpecifier;
	import javax.imageio.metadata.IIOInvalidTreeException;
	import javax.imageio.metadata.IIOMetadata;
	import javax.imageio.metadata.IIOMetadataNode;
	import javax.imageio.metadata.IIOMetadataFormat;
	import javax.imageio.metadata.IIOMetadataFormatImpl;
	import org.w3c.dom.Node;

	public class GIFImageMetadata extends GIFMetadata {

	// package scope
	static final String
	nativeMetadataFormatName = "javax_imageio_gif_image_1.0";

	static final String[] disposalMethodNames = {
	"none",
	"doNotDispose",
	"restoreToBackgroundColor",
	"restoreToPrevious",
	"undefinedDisposalMethod4",
	"undefinedDisposalMethod5",
	"undefinedDisposalMethod6",
	"undefinedDisposalMethod7"
	};

	// Fields from Image Descriptor
	public int imageLeftPosition;
	public int imageTopPosition;
	public int imageWidth;
	public int imageHeight;
	public boolean interlaceFlag = false;
	public boolean sortFlag = false;
	public byte[] localColorTable = null;

	// Fields from Graphic Control Extension
	public int disposalMethod = 0;
	public boolean userInputFlag = false;
	public boolean transparentColorFlag = false;
	public int delayTime = 0;
	public int transparentColorIndex = 0;

	// Fields from Plain Text Extension
	public boolean hasPlainTextExtension = false;
	public int textGridLeft;
	public int textGridTop;
	public int textGridWidth;
	public int textGridHeight;
	public int characterCellWidth;
	public int characterCellHeight;
	public int textForegroundColor;
	public int textBackgroundColor;
	public byte[] text;

	// Fields from ApplicationExtension
	// List of byte[]
	public List applicationIDs = null; // new ArrayList();

	// List of byte[]
	public List authenticationCodes = null; // new ArrayList();

	// List of byte[]
	public List applicationData = null; // new ArrayList();

	// Fields from CommentExtension
	// List of byte[]
	public List comments = null; // new ArrayList();

	protected GIFImageMetadata(boolean standardMetadataFormatSupported,
	String nativeMetadataFormatName,
	String nativeMetadataFormatClassName,
	String[] extraMetadataFormatNames,
	String[] extraMetadataFormatClassNames)
	{
	super(standardMetadataFormatSupported,
	nativeMetadataFormatName,
	nativeMetadataFormatClassName,
	extraMetadataFormatNames,
	extraMetadataFormatClassNames);
	}

	public GIFImageMetadata() {
	this(true,
	nativeMetadataFormatName,
	"com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
	null, null);
	}

	public boolean isReadOnly() {
	return true;
	}

	public Node getAsTree(String formatName) {
	if (formatName.equals(nativeMetadataFormatName)) {
	return getNativeTree();
	} else if (formatName.equals
	(IIOMetadataFormatImpl.standardMetadataFormatName)) {
	return getStandardTree();
	} else {
	throw new IllegalArgumentException("Not a recognized format!");
	}
	}

	private String toISO8859(byte[] data) {
	try {
	return new String(data, "ISO-8859-1");
	} catch (UnsupportedEncodingException e) {
	return "";
	}
	}

	private Node getNativeTree() {
	IIOMetadataNode node; // scratch node
	IIOMetadataNode root =
	new IIOMetadataNode(nativeMetadataFormatName);

	// Image descriptor
	node = new IIOMetadataNode("ImageDescriptor");
	node.setAttribute("imageLeftPosition",
	Integer.toString(imageLeftPosition));
	node.setAttribute("imageTopPosition",
	Integer.toString(imageTopPosition));
	node.setAttribute("imageWidth", Integer.toString(imageWidth));
	node.setAttribute("imageHeight", Integer.toString(imageHeight));
	node.setAttribute("interlaceFlag",
	interlaceFlag ? "TRUE" : "FALSE");
	root.appendChild(node);

	// Local color table
	if (localColorTable != null) {
	node = new IIOMetadataNode("LocalColorTable");
	int numEntries = localColorTable.length/3;
	node.setAttribute("sizeOfLocalColorTable",
	Integer.toString(numEntries));
	node.setAttribute("sortFlag",
	sortFlag ? "TRUE" : "FALSE");

	for (int i = 0; i < numEntries; i++) {
	IIOMetadataNode entry =
	new IIOMetadataNode("ColorTableEntry");
	entry.setAttribute("index", Integer.toString(i));
	int r = localColorTable[3*i] & 0xff;
	int g = localColorTable[3*i + 1] & 0xff;
	int b = localColorTable[3*i + 2] & 0xff;
	entry.setAttribute("red", Integer.toString(r));
	entry.setAttribute("green", Integer.toString(g));
	entry.setAttribute("blue", Integer.toString(b));
	node.appendChild(entry);
	}
	root.appendChild(node);
	}

	// Graphic control extension
	node = new IIOMetadataNode("GraphicControlExtension");
	node.setAttribute("disposalMethod",
	disposalMethodNames[disposalMethod]);
	node.setAttribute("userInputFlag",
	userInputFlag ? "TRUE" : "FALSE");
	node.setAttribute("transparentColorFlag",
	transparentColorFlag ? "TRUE" : "FALSE");
	node.setAttribute("delayTime",
	Integer.toString(delayTime));
	node.setAttribute("transparentColorIndex",
	Integer.toString(transparentColorIndex));
	root.appendChild(node);

	if (hasPlainTextExtension) {
	node = new IIOMetadataNode("PlainTextExtension");
	node.setAttribute("textGridLeft",
	Integer.toString(textGridLeft));
	node.setAttribute("textGridTop",
	Integer.toString(textGridTop));
	node.setAttribute("textGridWidth",
	Integer.toString(textGridWidth));
	node.setAttribute("textGridHeight",
	Integer.toString(textGridHeight));
	node.setAttribute("characterCellWidth",
	Integer.toString(characterCellWidth));
	node.setAttribute("characterCellHeight",
	Integer.toString(characterCellHeight));
	node.setAttribute("textForegroundColor",
	Integer.toString(textForegroundColor));
	node.setAttribute("textBackgroundColor",
	Integer.toString(textBackgroundColor));
	node.setAttribute("text", toISO8859(text));

	root.appendChild(node);
	}

	// Application extensions
	int numAppExtensions = applicationIDs == null ?
	0 : applicationIDs.size();
	if (numAppExtensions > 0) {
	node = new IIOMetadataNode("ApplicationExtensions");
	for (int i = 0; i < numAppExtensions; i++) {
	IIOMetadataNode appExtNode =
	new IIOMetadataNode("ApplicationExtension");
	byte[] applicationID = (byte[])applicationIDs.get(i);
	appExtNode.setAttribute("applicationID",
	toISO8859(applicationID));
	byte[] authenticationCode = (byte[])authenticationCodes.get(i);
	appExtNode.setAttribute("authenticationCode",
	toISO8859(authenticationCode));
	byte[] appData = (byte[])applicationData.get(i);
	appExtNode.setUserObject((byte[])appData.clone());
	node.appendChild(appExtNode);
	}

	root.appendChild(node);
	}

	// Comment extensions
	int numComments = comments == null ? 0 : comments.size();
	if (numComments > 0) {
	node = new IIOMetadataNode("CommentExtensions");
	for (int i = 0; i < numComments; i++) {
	IIOMetadataNode commentNode =
	new IIOMetadataNode("CommentExtension");
	byte[] comment = (byte[])comments.get(i);
	commentNode.setAttribute("value", toISO8859(comment));
	node.appendChild(commentNode);
	}

	root.appendChild(node);
	}

	return root;
	}

	public IIOMetadataNode getStandardChromaNode() {
	IIOMetadataNode chroma_node = new IIOMetadataNode("Chroma");
	IIOMetadataNode node = null; // scratch node

	node = new IIOMetadataNode("ColorSpaceType");
	node.setAttribute("name", "RGB");
	chroma_node.appendChild(node);

	node = new IIOMetadataNode("NumChannels");
	node.setAttribute("value", transparentColorFlag ? "4" : "3");
	chroma_node.appendChild(node);

	// Gamma not in format

	node = new IIOMetadataNode("BlackIsZero");
	node.setAttribute("value", "TRUE");
	chroma_node.appendChild(node);

	if (localColorTable != null) {
	node = new IIOMetadataNode("Palette");
	int numEntries = localColorTable.length/3;
	for (int i = 0; i < numEntries; i++) {
	IIOMetadataNode entry =
	new IIOMetadataNode("PaletteEntry");
	entry.setAttribute("index", Integer.toString(i));
	entry.setAttribute("red",
	Integer.toString(localColorTable[3*i] & 0xff));
	entry.setAttribute("green",
	Integer.toString(localColorTable[3*i + 1] & 0xff));
	entry.setAttribute("blue",
	Integer.toString(localColorTable[3*i + 2] & 0xff));
	node.appendChild(entry);
	}
	chroma_node.appendChild(node);
	}

	// BackgroundIndex not in image
	// BackgroundColor not in format

	return chroma_node;
	}

	public IIOMetadataNode getStandardCompressionNode() {
	IIOMetadataNode compression_node = new IIOMetadataNode("Compression");
	IIOMetadataNode node = null; // scratch node

	node = new IIOMetadataNode("CompressionTypeName");
	node.setAttribute("value", "lzw");
	compression_node.appendChild(node);

	node = new IIOMetadataNode("Lossless");
	node.setAttribute("value", "TRUE");
	compression_node.appendChild(node);

	node = new IIOMetadataNode("NumProgressiveScans");
	node.setAttribute("value", interlaceFlag ? "4" : "1");
	compression_node.appendChild(node);

	// BitRate not in format

	return compression_node;
	}

	public IIOMetadataNode getStandardDataNode() {
	IIOMetadataNode data_node = new IIOMetadataNode("Data");
	IIOMetadataNode node = null; // scratch node

	// PlanarConfiguration not in format

	node = new IIOMetadataNode("SampleFormat");
	node.setAttribute("value", "Index");
	data_node.appendChild(node);

	// BitsPerSample not in image
	// SignificantBitsPerSample not in format
	// SampleMSB not in format

	return data_node;
	}

	public IIOMetadataNode getStandardDimensionNode() {
	IIOMetadataNode dimension_node = new IIOMetadataNode("Dimension");
	IIOMetadataNode node = null; // scratch node

	// PixelAspectRatio not in image

	node = new IIOMetadataNode("ImageOrientation");
	node.setAttribute("value", "Normal");
	dimension_node.appendChild(node);

	// HorizontalPixelSize not in format
	// VerticalPixelSize not in format
	// HorizontalPhysicalPixelSpacing not in format
	// VerticalPhysicalPixelSpacing not in format
	// HorizontalPosition not in format
	// VerticalPosition not in format

	node = new IIOMetadataNode("HorizontalPixelOffset");
	node.setAttribute("value", Integer.toString(imageLeftPosition));
	dimension_node.appendChild(node);

	node = new IIOMetadataNode("VerticalPixelOffset");
	node.setAttribute("value", Integer.toString(imageTopPosition));
	dimension_node.appendChild(node);

	// HorizontalScreenSize not in image
	// VerticalScreenSize not in image

	return dimension_node;
	}

	// Document not in image

	public IIOMetadataNode getStandardTextNode() {
	if (comments == null) {
	return null;
	}
	Iterator commentIter = comments.iterator();
	if (!commentIter.hasNext()) {
	return null;
	}

	IIOMetadataNode text_node = new IIOMetadataNode("Text");
	IIOMetadataNode node = null; // scratch node

	while (commentIter.hasNext()) {
	byte[] comment = (byte[])commentIter.next();
	String s = null;
	try {
	s = new String(comment, "ISO-8859-1");
	} catch (UnsupportedEncodingException e) {
	throw new RuntimeException("Encoding ISO-8859-1 unknown!");
	}

	node = new IIOMetadataNode("TextEntry");
	node.setAttribute("value", s);
	node.setAttribute("encoding", "ISO-8859-1");
	node.setAttribute("compression", "none");
	text_node.appendChild(node);
	}

	return text_node;
	}

	public IIOMetadataNode getStandardTransparencyNode() {
	if (!transparentColorFlag) {
	return null;
	}

	IIOMetadataNode transparency_node =
	new IIOMetadataNode("Transparency");
	IIOMetadataNode node = null; // scratch node

	// Alpha not in format

	node = new IIOMetadataNode("TransparentIndex");
	node.setAttribute("value",
	Integer.toString(transparentColorIndex));
	transparency_node.appendChild(node);

	// TransparentColor not in format
	// TileTransparencies not in format
	// TileOpacities not in format

	return transparency_node;
	}

	public void setFromTree(String formatName, Node root)
	throws IIOInvalidTreeException
	{
	throw new IllegalStateException("Metadata is read-only!");
	}

	protected void mergeNativeTree(Node root) throws IIOInvalidTreeException
	{
	throw new IllegalStateException("Metadata is read-only!");
	}

	protected void mergeStandardTree(Node root) throws IIOInvalidTreeException
	{
	throw new IllegalStateException("Metadata is read-only!");
	}

	public void reset() {
	throw new IllegalStateException("Metadata is read-only!");
	}
	}