GDIComment.java

// Copyright 2001-2006, FreeHEP.
package org.freehep.graphicsio.emf.gdi;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.freehep.graphicsio.emf.EMFInputStream;
import org.freehep.graphicsio.emf.EMFOutputStream;
import org.freehep.graphicsio.emf.EMFTag;
import org.freehep.util.io.Tag;

/**
 * GDIComment TAG.
 * 
 * @author Mark Donszelmann
 * @version $Id: GDIComment.java,v 1.4 2009-08-17 21:44:44 murkle Exp $
 */
public class GDIComment extends EMFTag {

	private static final String EMF_PLUS = "EMF+";

	private byte[] bytes;
	private EMFTag tag;

	public GDIComment() {
		super(70, 1);
	}

	public GDIComment(String comment) {
		this(comment.getBytes());
	}

	public GDIComment(byte[] bytes) {
		this();
		this.bytes = bytes;
	}

	// FIXME should be EMFPlusTag
	public GDIComment(EMFTag tag) {
		this();
		this.tag = tag;
	}

	@Override
	public EMFTag read(int tagID, EMFInputStream emf, int len)
			throws IOException {
		// FIXME decode internal EMFPlus Tags
		int l = emf.readDWORD();
		GDIComment tag = new GDIComment(emf.readBYTE(l));
		// Align to 4-byte boundary
		if (l % 4 != 0) {
			emf.readBYTE(4 - l % 4);
		}
		return tag;
	}

	@Override
	public void write(int tagID, EMFOutputStream emf) throws IOException {
		if (tag != null) {
			emf.pushBuffer();
			emf.writeBYTE(EMF_PLUS.getBytes());
			emf.writeTag(tag, true);
			int len = emf.popBuffer();
			emf.writeDWORD(len);
			emf.append();
		} else {
			emf.writeDWORD(bytes.length);
			emf.writeBYTE(bytes);
			if (bytes.length % 4 != 0) {
				for (int i = 0; i < 4 - bytes.length % 4; i++) {
					emf.writeBYTE(0);
				}
			}
		}
	}

	@Override
	public String toString() {
		StringBuffer sb = new StringBuffer(super.toString());
		sb.append("\n");
		sb.append("  length: ");
		sb.append(bytes.length);
		sb.append("\n");
		String s = new String(bytes);
		if (s.startsWith(EMF_PLUS)) {
			try {
				EMFInputStream emf = new EMFInputStream(
						new ByteArrayInputStream(bytes, 4, bytes.length - 4),
						0x4001);
				sb.append(" --> Embedding:\n");
				Tag emfPlusTag = emf.readTag();
				while (emfPlusTag != null) {
					sb.append(emfPlusTag);
					emfPlusTag = emf.readTag();
					if (emfPlusTag != null) {
						sb.append("\n");
					}
				}
				emf.close();
			} catch (IOException e) {
				System.err.println(e);
			}
		} else {
			int n = Math.min(bytes.length, 40);
			sb.append("  bytes: ");
			for (int i = 0; i < n; i++) {
				if (i != 0) {
					sb.append(" ");
				}
				sb.append(Integer.toHexString(bytes[i]));
			}
			sb.append(" ");
			sb.append(new String(bytes));
		}
		return sb.toString();
	}
}