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PlantUML is a component that allows to quickly write diagrams from text.
// 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 General Public License V2.
*
* THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
* LICENSE ("AGREEMENT"). [GNU General Public License V2]
*
* ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
* RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
*
* You may obtain a copy of the License at
*
* https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* Unless required by applicable law or agreed to in writing, software
* 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.
*
* 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 GPL v2 license.
*
* The generated images can then be used without any reference to the GPL v2 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.zopfli;
public class Zopfli {
private static class Crc {
private final static int[] table = makeTable();
private static int[] makeTable() {
int[] result = new int[256];
for (int n = 0; n < 256; ++n) {
int c = n;
for (int k = 0; k < 8; ++k) {
if ((c & 1) == 1) {
c = 0xEDB88320 ^ (c >>> 1);
} else {
c = c >>> 1;
}
}
result[n] = c;
}
return result;
}
public static int calculate(byte[] input) {
int c = ~0;
for (int i = 0, n = input.length; i < n; ++i) {
c = table[(c ^ input[i]) & 0xFF] ^ (c >>> 8);
}
return ~c;
}
}
private final Cookie cookie;
public synchronized Buffer compress(Options options, byte[] input) {
Buffer output = new Buffer();
switch (options.outputType) {
case GZIP:
compressGzip(options, input, output);
break;
case ZLIB:
compressZlib(options, input, output);
break;
case DEFLATE:
Deflate.compress(cookie, options, input, output);
break;
default:
throw new IllegalArgumentException("Unexpected output format: " + options.outputType);
}
return output;
}
/**
* Calculates the adler32 checksum of the data
*/
private static int adler32(byte[] data) {
int s1 = 1;
int s2 = 1 >> 16;
int i = 0;
while (i < data.length) {
int tick = Math.min(data.length, i + 1024);
while (i < tick) {
s1 += data[i++];
s2 += s1;
}
s1 %= 65521;
s2 %= 65521;
}
return (s2 << 16) | s1;
}
private void compressZlib(Options options, byte[] input, Buffer output) {
output.append((byte) 0x78);
output.append((byte) 0x1E);
Deflate.compress(cookie, options, input, output);
int checksum = adler32(input);
output.append((byte) ((checksum >> 24) & 0xFF));
output.append((byte) ((checksum >> 16) & 0xFF));
output.append((byte) ((checksum >> 8) & 0xFF));
output.append((byte) (checksum & 0xFF));
}
private void compressGzip(Options options, byte[] input, Buffer output) {
output.append((byte) 31);
output.append((byte) 139);
output.append((byte) 8);
output.append((byte) 0);
output.append((byte) 0);
output.append((byte) 0);
output.append((byte) 0);
output.append((byte) 0);
output.append((byte) 2);
output.append((byte) 3);
Deflate.compress(cookie, options, input, output);
int crc = Crc.calculate(input);
output.append((byte) (crc & 0xFF));
output.append((byte) ((crc >> 8) & 0xFF));
output.append((byte) ((crc >> 16) & 0xFF));
output.append((byte) ((crc >> 24) & 0xFF));
int size = input.length;
output.append((byte) (size & 0xFF));
output.append((byte) ((size >> 8) & 0xFF));
output.append((byte) ((size >> 16) & 0xFF));
output.append((byte) ((size >> 24) & 0xFF));
}
public Zopfli(int masterBlockSize) {
cookie = new Cookie(masterBlockSize);
}
}