| /* |
| * 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.metadata.IIOMetadataNode; |
| import javax.imageio.stream.ImageOutputStream; |
| import javax.imageio.metadata.IIOInvalidTreeException; |
| |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| |
| import org.w3c.dom.Node; |
| |
| /** |
| * A Comment marker segment. Retains an array of bytes representing the |
| * comment data as it is read from the stream. If the marker segment is |
| * constructed from a String, then local default encoding is assumed |
| * when creating the byte array. If the marker segment is created from |
| * an <code>IIOMetadataNode</code>, the user object, if present is |
| * assumed to be a byte array containing the comment data. If there is |
| * no user object then the comment attribute is used to create the |
| * byte array, again assuming the default local encoding. |
| */ |
| class COMMarkerSegment extends MarkerSegment { |
| private static final String ENCODING = "ISO-8859-1"; |
| |
| /** |
| * Constructs a marker segment from the given buffer, which contains |
| * data from an <code>ImageInputStream</code>. This is used when |
| * reading metadata from a stream. |
| */ |
| COMMarkerSegment(JPEGBuffer buffer) throws IOException { |
| super(buffer); |
| loadData(buffer); |
| } |
| |
| /** |
| * Constructs a marker segment from a String. This is used when |
| * modifying metadata from a non-native tree and when transcoding. |
| * The default encoding is used to construct the byte array. |
| */ |
| COMMarkerSegment(String comment) { |
| super(JPEG.COM); |
| data = comment.getBytes(); // Default encoding |
| } |
| |
| /** |
| * Constructs a marker segment from a native tree node. If the node |
| * is an <code>IIOMetadataNode</code> and contains a user object, |
| * that object is used rather than the string attribute. If the |
| * string attribute is used, the default encoding is used. |
| */ |
| COMMarkerSegment(Node node) throws IIOInvalidTreeException{ |
| super(JPEG.COM); |
| if (node instanceof IIOMetadataNode) { |
| IIOMetadataNode ourNode = (IIOMetadataNode) node; |
| data = (byte []) ourNode.getUserObject(); |
| } |
| if (data == null) { |
| String comment = |
| node.getAttributes().getNamedItem("comment").getNodeValue(); |
| if (comment != null) { |
| data = comment.getBytes(); // Default encoding |
| } else { |
| throw new IIOInvalidTreeException("Empty comment node!", node); |
| } |
| } |
| } |
| |
| /** |
| * Returns the array encoded as a String, using ISO-Latin-1 encoding. |
| * If an application needs another encoding, the data array must be |
| * consulted directly. |
| */ |
| String getComment() { |
| try { |
| return new String (data, ENCODING); |
| } catch (UnsupportedEncodingException e) {} // Won't happen |
| return null; |
| } |
| |
| /** |
| * Returns an <code>IIOMetadataNode</code> containing the data array |
| * as a user object and a string encoded using ISO-8895-1, as an |
| * attribute. |
| */ |
| IIOMetadataNode getNativeNode() { |
| IIOMetadataNode node = new IIOMetadataNode("com"); |
| node.setAttribute("comment", getComment()); |
| if (data != null) { |
| node.setUserObject(data.clone()); |
| } |
| return node; |
| } |
| |
| /** |
| * Writes the data for this segment to the stream in |
| * valid JPEG format, directly from the data array. |
| */ |
| void write(ImageOutputStream ios) throws IOException { |
| length = 2 + data.length; |
| writeTag(ios); |
| ios.write(data); |
| } |
| |
| void print() { |
| printTag("COM"); |
| System.out.println("<" + getComment() + ">"); |
| } |
| } |