mirror of https://github.com/octoleo/plantuml.git
96 lines
2.8 KiB
Java
96 lines
2.8 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 java.io.ByteArrayInputStream;
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import java.util.zip.Deflater;
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import net.sourceforge.plantuml.code.deflate.ByteBitInputStream;
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import net.sourceforge.plantuml.code.deflate.Decompressor;
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public class CompressionZlib implements Compression {
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// ::comment when WASM
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private static boolean USE_ZOPFLI = false;
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// ::done
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private static final int COMPRESSION_LEVEL = 9;
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public byte[] compress(byte[] in) {
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// ::comment when WASM
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if (USE_ZOPFLI)
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return new CompressionZopfliZlib().compress(in);
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// ::done
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if (in.length == 0)
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return null;
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int len = in.length * 2;
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if (len < 1000)
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len = 1000;
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// Compress the bytes
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final Deflater compresser = new Deflater(COMPRESSION_LEVEL, true);
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compresser.setInput(in);
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compresser.finish();
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final byte[] output = new byte[len];
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final int compressedDataLength = compresser.deflate(output);
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if (compresser.finished() == false)
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return null;
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return copyArray(output, compressedDataLength);
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}
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public ByteArray decompress(byte[] input) throws NoPlantumlCompressionException {
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final byte padded[] = new byte[input.length + 256];
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System.arraycopy(input, 0, padded, 0, input.length);
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final ByteBitInputStream inputStream = new ByteBitInputStream(new ByteArrayInputStream(padded));
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try {
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return ByteArray.from(Decompressor.decompress(inputStream));
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} catch (Exception e) {
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throw new NoPlantumlCompressionException(e);
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}
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}
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private byte[] copyArray(final byte[] data, final int len) {
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final byte[] result = new byte[len];
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System.arraycopy(data, 0, result, 0, len);
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return result;
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}
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}
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