feat: adding undocumented support for gzip URL

gradle.properties

@@ -1,4 +1,4 @@
 # Warning, "version" should be the same in gradle.properties and Version.java
 # Any idea anyone how to magically synchronize those :-) ?
-version = 1.2024.2
+version = 1.2024.3beta1
 org.gradle.workers.max = 3

src/net/sourceforge/plantuml/code/CompressionGZip.java

@@ -0,0 +1,71 @@
+/* ========================================================================
+ * 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/paypal
+ * 
+ * This file is part of PlantUML.
+ *
+ * PlantUML is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PlantUML distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ *
+ * Original Author:  Arnaud Roques
+ *
+ *
+ */
+package net.sourceforge.plantuml.code;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.zip.GZIPInputStream;
+
+public class CompressionGZip implements Compression {
+	// ::remove file when __CORE__
+
+	public byte[] compress(byte[] in) {
+		throw new UnsupportedOperationException();
+	}
+
+	public ByteArray decompress(byte[] input) throws NoPlantumlCompressionException {
+		try {
+			try (final GZIPInputStream gzip = new GZIPInputStream(new ByteArrayInputStream(input))) {
+				final byte[] buffer = new byte[10_000];
+
+				try (final ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+					int len;
+					while ((len = gzip.read(buffer)) > 0) {
+						baos.write(buffer, 0, len);
+						if (baos.size() > 200_000)
+							throw new NoPlantumlCompressionException("Gzip error");
+					}
+					return ByteArray.from(baos.toByteArray());
+				}
+			}
+		} catch (IOException e) {
+			throw new NoPlantumlCompressionException(e);
+		}
+
+	}
+
+}

src/net/sourceforge/plantuml/code/TranscoderSmart.java

@@ -49,6 +49,8 @@ public class TranscoderSmart implements Transcoder {
 			new CompressionHuffman());
 	private final Transcoder zip = TranscoderImpl.utf8(new AsciiEncoder(), new ArobaseStringCompressor(),
 			new CompressionZip());
+	private final Transcoder gzip = TranscoderImpl.utf8(new AsciiEncoder(), new ArobaseStringCompressor(),
+			new CompressionGZip());
 	// ::done
 
 	public String decode(String code) throws NoPlantumlCompressionException {
@@ -66,6 +68,9 @@ public class TranscoderSmart implements Transcoder {
 		if (code.startsWith("~h"))
 			return hexOnly.decode(code.substring(2));
 
+		if (code.startsWith("~g"))
+			return gzip.decode(code.substring(2));
+
 		// ::comment when __CORE__
 		if (code.startsWith("~zip~"))
 			return zip.decode(code.substring(5));

src/net/sourceforge/plantuml/code/TranscoderSmartProtected.java

@@ -49,6 +49,8 @@ public class TranscoderSmartProtected implements Transcoder {
 			new CompressionNone());
 	private final Transcoder zip = TranscoderImpl.utf8(new AsciiEncoder(), new ArobaseStringCompressor(),
 			new CompressionZip());
+	private final Transcoder gzip = TranscoderImpl.utf8(new AsciiEncoder(), new ArobaseStringCompressor(),
+			new CompressionGZip());
 
 	public String decode(String code) throws NoPlantumlCompressionException {
 		// Work in progress
@@ -63,6 +65,9 @@ public class TranscoderSmartProtected implements Transcoder {
 		if (code.startsWith("~h"))
 			return hexOnly.decode(code.substring(2));
 
+		if (code.startsWith("~g"))
+			return gzip.decode(code.substring(2));
+
 		if (code.startsWith("~zip~"))
 			return zip.decode(code.substring(5));
 

src/net/sourceforge/plantuml/version/Version.java

@@ -46,7 +46,7 @@ public class Version {
 
 	// Warning, "version" should be the same in gradle.properties and Version.java
 	// Any idea anyone how to magically synchronize those :-) ?
-	private static final String version = "1.2024.2";
+	private static final String version = "1.2024.3beta1";
 
 	public static String versionString() {
 		return version;