Added OutputStream.nullOutputStream() MCR

Author: RaphiMC

runtime-dep/src/main/java/net/raphimc/javadowngrader/runtime/NullOutputStream.java

@@ -0,0 +1,46 @@
+/*
+ * MIT License
+ *
+ * This file is part of JavaDowngrader - https://github.com/RaphiMC/JavaDowngrader
+ * Copyright (c) 2023 RK_01/RaphiMC and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package net.raphimc.javadowngrader.runtime;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class NullOutputStream extends OutputStream {
+
+    private volatile boolean closed = false;
+
+    @Override
+    public void write(int b) throws IOException {
+        if (this.closed) {
+            throw new IOException("Stream closed");
+        }
+    }
+
+    @Override
+    public void close() {
+        this.closed = true;
+    }
+
+}

src/main/java/net/raphimc/javadowngrader/transformer/j10/Java11ToJava10.java

@@ -47,6 +47,8 @@ public Java11ToJava10() {
 
         this.addMethodCallReplacer(Opcodes.INVOKEVIRTUAL, "java/util/zip/Inflater", "setInput", "(Ljava/nio/ByteBuffer;)V", new InflaterSetInputMCR());
         this.addMethodCallReplacer(Opcodes.INVOKEVIRTUAL, "java/util/zip/Inflater", "inflate", "(Ljava/nio/ByteBuffer;)I", new InflaterInflateMCR());
+
+        this.addMethodCallReplacer(Opcodes.INVOKESTATIC, "java/io/OutputStream", "nullOutputStream", "()Ljava/io/OutputStream;", new OutputStreamNullOutputStreamMCR());
     }
 
     @Override

src/main/java/net/raphimc/javadowngrader/transformer/j10/methodcallreplacer/OutputStreamNullOutputStreamMCR.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of JavaDowngrader - https://github.com/RaphiMC/JavaDowngrader
+ * Copyright (C) 2023 RK_01/RaphiMC and contributors
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is 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 program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package net.raphimc.javadowngrader.transformer.j10.methodcallreplacer;
+
+import net.raphimc.javadowngrader.RuntimeDepCollector;
+import net.raphimc.javadowngrader.transformer.DowngradeResult;
+import net.raphimc.javadowngrader.transformer.MethodCallReplacer;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.*;
+
+public class OutputStreamNullOutputStreamMCR implements MethodCallReplacer {
+
+    @Override
+    public InsnList getReplacement(ClassNode classNode, MethodNode method, String originalName, String originalDesc, RuntimeDepCollector depCollector, DowngradeResult result) {
+        depCollector.accept("net/raphimc/javadowngrader/runtime/NullOutputStream");
+
+        final InsnList replacement = new InsnList();
+
+        //
+        replacement.add(new TypeInsnNode(Opcodes.NEW, "net/raphimc/javadowngrader/runtime/NullOutputStream"));
+        replacement.add(new InsnNode(Opcodes.DUP));
+        replacement.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "net/raphimc/javadowngrader/runtime/NullOutputStream", "<init>", "()V"));
+        // OutputStream
+
+        return replacement;
+    }
+
+}