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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 GNU General Public License V2.
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 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
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 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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 * 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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 * 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 GPL v2 license.
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 * The generated images can then be used without any reference to the GPL v2 license.
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 * although this will be appreciated by the PlantUML team.
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 * by any license, then the generated images are logically covered
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 *
 * 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
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 *
 */
package net.sourceforge.plantuml.code;

import java.io.ByteArrayInputStream;
import java.util.zip.Deflater;

import net.sourceforge.plantuml.code.deflate.ByteBitInputStream;
import net.sourceforge.plantuml.code.deflate.Decompressor;

public class CompressionZlib implements Compression {

	// ::comment when __CORE__
	private static boolean USE_ZOPFLI = false;
	private static final int COMPRESSION_LEVEL = 9;

	public byte[] compress(byte[] in) {
		// ::comment when __CORE__
		if (USE_ZOPFLI)
			return new CompressionZopfliZlib().compress(in);

		if (in.length == 0)
			return null;

		int len = in.length * 2;
		if (len < 1000)
			len = 1000;

		// Compress the bytes
		final Deflater compresser = new Deflater(COMPRESSION_LEVEL, true);
		compresser.setInput(in);
		compresser.finish();

		final byte[] output = new byte[len];
		final int compressedDataLength = compresser.deflate(output);
		if (compresser.finished() == false)
			return null;

		return copyArray(output, compressedDataLength);
	}

	public ByteArray decompress(byte[] input) throws NoPlantumlCompressionException {
		final byte padded[] = new byte[input.length + 256];
		System.arraycopy(input, 0, padded, 0, input.length);

		final ByteBitInputStream inputStream = new ByteBitInputStream(new ByteArrayInputStream(padded));
		try {
			return ByteArray.from(Decompressor.decompress(inputStream));
		} catch (Exception e) {
			throw new NoPlantumlCompressionException(e);
		}
	}

	private byte[] copyArray(final byte[] data, final int len) {
		final byte[] result = new byte[len];
		System.arraycopy(data, 0, result, 0, len);
		return result;
	}

}