mirror of https://github.com/octoleo/plantuml.git
118 lines
3.5 KiB
Java
118 lines
3.5 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* (C) Copyright 2009-2023, Arnaud Roques
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*
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* Project Info: http://plantuml.com
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*
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* If you like this project or if you find it useful, you can support us at:
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*
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* http://plantuml.com/patreon (only 1$ per month!)
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* http://plantuml.com/paypal
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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*
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* Original Author: Arnaud Roques
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*
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*
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*/
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package net.sourceforge.plantuml.code;
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import net.sourceforge.plantuml.log.Logger;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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public class Upf9Encoder {
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private Upf9Encoder() {
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}
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public static byte[] encodeChar(char c) {
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final byte[] result = encodeCharInternal(c);
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assert checkBack(c, result);
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return result;
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}
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private static boolean checkBack(char c, byte[] result) {
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try {
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if (c == Upf9Decoder.decodeChar(new ByteArrayInputStream(result)))
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return true;
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} catch (IOException e) {
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Logger.error(e);
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}
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return false;
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}
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private static byte[] encodeCharInternal(char c) {
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if (c == '\n' || c == '\r' || c == '\t') {
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// Using regular ASCII code for <u+0009> <u+000A> and <u+000D>
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return new byte[] { (byte) c };
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}
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if (c >= '\u000E' && c <= '\u0012') {
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return new byte[] { (byte) c };
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}
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if (c >= '\u0020' && c <= '\u007E') {
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// Using regular ASCII code for ASCII printable char
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return new byte[] { (byte) c };
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}
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if (c >= '\u0080' && c <= '\u00FF') {
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// Char from <u+0080> to <u+00FF> are encoded as [0x0B 0x80] to [0x0B 0xFF]
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return new byte[] { 0x0B, (byte) c };
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}
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if (c >= '\u0100' && c <= '\u08FF') {
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// Char from <u+0100> to <u+08FF> are encoded as [0x01 0x00] to [0x08 0xFF]
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return new byte[] { highByte(c), lowByte(c) };
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}
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if (c >= '\u2000' && c <= '\u9FFF') {
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// Char from <u+2000> to <u+9FFF> are encoded as [0x80 0x00] to [0xFF 0xFF]
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return new byte[] { (byte) (0x60 + highByte(c)), lowByte(c) };
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}
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if (c >= '\uE000' && c <= '\uE07F') {
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// Char from <u+E000> to <u+E07F> are encoded as [0x0B 0x00] to [0x0B 0x7F]
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return new byte[] { 0x0B, lowByte(c) };
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}
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// All other char are encoded on 3 bytes, starting with 0x0C
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return new byte[] { 0x0C, highByte(c), lowByte(c) };
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}
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private static byte lowByte(char c) {
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return (byte) (c & 0x00FF);
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}
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private static byte highByte(char c) {
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return (byte) ((c & 0xFF00) >> 8);
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}
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public static byte[] getBytes(String s) throws IOException {
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final ByteArrayOutputStream baos = new ByteArrayOutputStream();
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for (int i = 0; i < s.length(); i++) {
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baos.write(encodeChar(s.charAt(i)));
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}
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baos.close();
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final byte[] result = baos.toByteArray();
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assert s.endsWith(Upf9Decoder.decodeString(result, result.length));
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return result;
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}
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}
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