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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
 * |
 * +=======================================================================
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 * (C) Copyright 2009-2024, Arnaud Roques
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 * Project Info:  https://plantuml.com
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Eclipse Public License.
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 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
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 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * http://www.eclipse.org/legal/epl-v10.html
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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 * 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
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 * 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 EPL license.
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 * The generated images can then be used without any reference to the EPL license.
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 * (see https://plantuml.com/graphviz-dot )
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 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
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 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
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 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
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 *
 */
package net.sourceforge.plantuml.code;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.InflaterInputStream;

public class CompressionHuffman implements Compression {
	// ::remove file when __CORE__

	public byte[] compress(byte[] in) {
		final ByteArrayOutputStream baos = new ByteArrayOutputStream();
		final Deflater deflater = new Deflater(Deflater.HUFFMAN_ONLY);
		deflater.setLevel(9);
		final DeflaterOutputStream gz = new DeflaterOutputStream(baos, deflater);
		try {
			gz.write(in);
			gz.close();
			baos.close();
			return baos.toByteArray();
		} catch (IOException e) {
			throw new IllegalStateException(e.toString());
		}
	}

	public ByteArray decompress(byte[] in) throws NoPlantumlCompressionException {
		try {
			final ByteArrayOutputStream baos = new ByteArrayOutputStream();

			final ByteArrayInputStream bais = new ByteArrayInputStream(in);
			final InflaterInputStream gz = new InflaterInputStream(bais);
			int read;
			while ((read = gz.read()) != -1) {
				baos.write(read);
			}
			gz.close();
			bais.close();
			baos.close();
			return ByteArray.from(baos.toByteArray());
		} catch (IOException e) {
			// System.err.println("Not Huffman");
			throw new NoPlantumlCompressionException(e);
		}
	}

}