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/*
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* Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.imageio.plugins.jpeg;
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import javax.imageio.metadata.IIOInvalidTreeException;
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import javax.imageio.metadata.IIOMetadataNode;
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import javax.imageio.stream.ImageOutputStream;
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import javax.imageio.plugins.jpeg.JPEGHuffmanTable;
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import java.io.IOException;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Iterator;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.NamedNodeMap;
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/**
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* A DHT (Define Huffman Table) marker segment.
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*/
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class DHTMarkerSegment extends MarkerSegment {
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List tables = new ArrayList();
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DHTMarkerSegment(boolean needFour) {
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super(JPEG.DHT);
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tables.add(new Htable(JPEGHuffmanTable.StdDCLuminance, true, 0));
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if (needFour) {
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tables.add(new Htable(JPEGHuffmanTable.StdDCChrominance, true, 1));
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}
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tables.add(new Htable(JPEGHuffmanTable.StdACLuminance, false, 0));
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if (needFour) {
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tables.add(new Htable(JPEGHuffmanTable.StdACChrominance, false, 1));
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}
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}
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DHTMarkerSegment(JPEGBuffer buffer) throws IOException {
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super(buffer);
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int count = length;
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while (count > 0) {
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Htable newGuy = new Htable(buffer);
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tables.add(newGuy);
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count -= 1 + 16 + newGuy.values.length;
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}
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buffer.bufAvail -= length;
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}
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DHTMarkerSegment(JPEGHuffmanTable[] dcTables,
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JPEGHuffmanTable[] acTables) {
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super(JPEG.DHT);
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for (int i = 0; i < dcTables.length; i++) {
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tables.add(new Htable(dcTables[i], true, i));
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}
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for (int i = 0; i < acTables.length; i++) {
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tables.add(new Htable(acTables[i], false, i));
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}
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}
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DHTMarkerSegment(Node node) throws IIOInvalidTreeException {
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super(JPEG.DHT);
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NodeList children = node.getChildNodes();
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int size = children.getLength();
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if ((size < 1) || (size > 4)) {
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throw new IIOInvalidTreeException("Invalid DHT node", node);
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}
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for (int i = 0; i < size; i++) {
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tables.add(new Htable(children.item(i)));
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}
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}
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protected Object clone() {
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DHTMarkerSegment newGuy = (DHTMarkerSegment) super.clone();
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newGuy.tables = new ArrayList(tables.size());
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Iterator iter = tables.iterator();
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while (iter.hasNext()) {
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Htable table = (Htable) iter.next();
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newGuy.tables.add(table.clone());
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}
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return newGuy;
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}
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IIOMetadataNode getNativeNode() {
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IIOMetadataNode node = new IIOMetadataNode("dht");
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for (int i= 0; i<tables.size(); i++) {
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Htable table = (Htable) tables.get(i);
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node.appendChild(table.getNativeNode());
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}
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return node;
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}
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/**
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* Writes the data for this segment to the stream in
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* valid JPEG format.
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*/
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void write(ImageOutputStream ios) throws IOException {
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// We don't write DHT segments; the IJG library does.
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}
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void print() {
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printTag("DHT");
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System.out.println("Num tables: "
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+ Integer.toString(tables.size()));
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for (int i= 0; i<tables.size(); i++) {
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Htable table = (Htable) tables.get(i);
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table.print();
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}
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System.out.println();
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}
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Htable getHtableFromNode(Node node) throws IIOInvalidTreeException {
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return new Htable(node);
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}
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void addHtable(JPEGHuffmanTable table, boolean isDC, int id) {
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tables.add(new Htable(table, isDC, id));
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}
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/**
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* A Huffman table within a DHT marker segment.
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*/
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class Htable implements Cloneable {
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int tableClass; // 0 == DC, 1 == AC
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int tableID; // 0 - 4
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private static final int NUM_LENGTHS = 16;
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// # of codes of each length
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short [] numCodes = new short[NUM_LENGTHS];
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short [] values;
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Htable(JPEGBuffer buffer) {
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tableClass = buffer.buf[buffer.bufPtr] >>> 4;
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tableID = buffer.buf[buffer.bufPtr++] & 0xf;
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for (int i = 0; i < NUM_LENGTHS; i++) {
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numCodes[i] = (short) (buffer.buf[buffer.bufPtr++] & 0xff);
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}
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int numValues = 0;
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for (int i = 0; i < NUM_LENGTHS; i++) {
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numValues += numCodes[i];
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}
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values = new short[numValues];
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for (int i = 0; i < numValues; i++) {
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values[i] = (short) (buffer.buf[buffer.bufPtr++] & 0xff);
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}
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}
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Htable(JPEGHuffmanTable table, boolean isDC, int id) {
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tableClass = isDC ? 0 : 1;
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tableID = id;
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numCodes = table.getLengths();
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values = table.getValues();
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}
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Htable(Node node) throws IIOInvalidTreeException {
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if (node.getNodeName().equals("dhtable")) {
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NamedNodeMap attrs = node.getAttributes();
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int count = attrs.getLength();
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if (count != 2) {
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throw new IIOInvalidTreeException
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("dhtable node must have 2 attributes", node);
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}
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tableClass = getAttributeValue(node, attrs, "class", 0, 1, true);
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tableID = getAttributeValue(node, attrs, "htableId", 0, 3, true);
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if (node instanceof IIOMetadataNode) {
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IIOMetadataNode ourNode = (IIOMetadataNode) node;
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JPEGHuffmanTable table =
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(JPEGHuffmanTable) ourNode.getUserObject();
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if (table == null) {
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throw new IIOInvalidTreeException
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("dhtable node must have user object", node);
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}
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numCodes = table.getLengths();
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values = table.getValues();
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} else {
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throw new IIOInvalidTreeException
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("dhtable node must have user object", node);
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}
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} else {
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throw new IIOInvalidTreeException
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("Invalid node, expected dqtable", node);
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}
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}
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protected Object clone() {
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Htable newGuy = null;
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try {
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newGuy = (Htable) super.clone();
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} catch (CloneNotSupportedException e) {} // won't happen
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if (numCodes != null) {
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newGuy.numCodes = numCodes.clone();
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}
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if (values != null) {
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newGuy.values = values.clone();
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}
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return newGuy;
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}
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IIOMetadataNode getNativeNode() {
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IIOMetadataNode node = new IIOMetadataNode("dhtable");
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node.setAttribute("class", Integer.toString(tableClass));
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node.setAttribute("htableId", Integer.toString(tableID));
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node.setUserObject(new JPEGHuffmanTable(numCodes, values));
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return node;
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}
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void print() {
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System.out.println("Huffman Table");
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System.out.println("table class: "
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+ ((tableClass == 0) ? "DC":"AC"));
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System.out.println("table id: " + Integer.toString(tableID));
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(new JPEGHuffmanTable(numCodes, values)).toString();
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/*
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System.out.print("Lengths:");
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for (int i=0; i<16; i++) {
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System.out.print(" " + Integer.toString(numCodes[i]));
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}
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int count = 0;
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if (values.length > 16) {
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System.out.println("\nFirst 16 Values:");
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count = 16;
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} else {
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System.out.println("\nValues:");
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count = values.length;
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}
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for (int i=0; i<count; i++) {
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System.out.println(Integer.toString(values[i]&0xff));
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}
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*/
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}
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}
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}
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