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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.code;

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

import net.sourceforge.plantuml.log.Logme;

public class Upf9Encoder {
	// ::remove file when __CORE__

	private Upf9Encoder() {

	}

	public static byte[] encodeChar(char c) {
		final byte[] result = encodeCharInternal(c);
		assert checkBack(c, result);
		return result;
	}

	private static boolean checkBack(char c, byte[] result) {
		try {
			if (c == Upf9Decoder.decodeChar(new ByteArrayInputStream(result)))
				return true;
		} catch (IOException e) {
			Logme.error(e);
		}
		return false;
	}

	private static byte[] encodeCharInternal(char c) {
		if (c == '\n' || c == '\r' || c == '\t') {
			// Using regular ASCII code for   and 
			return new byte[] { (byte) c };
		}
		if (c >= '\u000E' && c <= '\u0012') {
			return new byte[] { (byte) c };
		}
		if (c >= '\u0020' && c <= '\u007E') {
			// Using regular ASCII code for ASCII printable char
			return new byte[] { (byte) c };
		}
		if (c >= '\u0080' && c <= '\u00FF') {
			// Char from  to  are encoded as [0x0B 0x80] to [0x0B 0xFF]
			return new byte[] { 0x0B, (byte) c };
		}
		if (c >= '\u0100' && c <= '\u08FF') {
			// Char from  to  are encoded as [0x01 0x00] to [0x08 0xFF]
			return new byte[] { highByte(c), lowByte(c) };
		}
		if (c >= '\u2000' && c <= '\u9FFF') {
			// Char from  to  are encoded as [0x80 0x00] to [0xFF 0xFF]
			return new byte[] { (byte) (0x60 + highByte(c)), lowByte(c) };
		}
		if (c >= '\uE000' && c <= '\uE07F') {
			// Char from  to  are encoded as [0x0B 0x00] to [0x0B 0x7F]
			return new byte[] { 0x0B, lowByte(c) };
		}
		// All other char are encoded on 3 bytes, starting with 0x0C
		return new byte[] { 0x0C, highByte(c), lowByte(c) };
	}

	private static byte lowByte(char c) {
		return (byte) (c & 0x00FF);
	}

	private static byte highByte(char c) {
		return (byte) ((c & 0xFF00) >> 8);
	}

	public static byte[] getBytes(String s) throws IOException {
		final ByteArrayOutputStream baos = new ByteArrayOutputStream();
		for (int i = 0; i < s.length(); i++) {
			baos.write(encodeChar(s.charAt(i)));
		}
		baos.close();
		final byte[] result = baos.toByteArray();
		assert s.endsWith(Upf9Decoder.decodeString(result, result.length));
		return result;
	}

}