gargan

But where add the return instruction? Before or after toInject.add(new MethodInsnNode(INVOKESTATIC, "pickandcraftSkin/PlayerCustom", "getURLSkincustom", "(Ljava/lang/String;)Ljava/lang/String;")) ? And how add the return instruction? I can't do this: toInject.add("ARETURN")! Sorry for my english: I'm french and I don't speak very well english

Hello! I try to modify 2 functions: getSkinUrl and getCapeUrl with ASM in order to create my own skin system. In this way i can do event in my server. Tank's to this code I have managed to delete the content of function and i have add a invocation to a static method. But I want return the result and I don't know how do this! package pickandcraftSkin; import static org.objectweb.asm.Opcodes.ALOAD; import static org.objectweb.asm.Opcodes.INVOKESTATIC; import java.util.Iterator; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.tree.AbstractInsnNode; import org.objectweb.asm.tree.ClassNode; import org.objectweb.asm.tree.InsnList; import org.objectweb.asm.tree.MethodInsnNode; import org.objectweb.asm.tree.MethodNode; import org.objectweb.asm.tree.VarInsnNode; public class EDClassTransformer implements net.minecraft.launchwrapper.IClassTransformer { @Override public byte[] transform(String arg0, String arg1, byte[] arg2) { if (arg0.equals("beu")) { System.out.println("********* INSIDE OBFUSCATED AbstractClientPlayer TRANSFORMER ABOUT TO PATCH: " + arg0); return patchClassASM(arg0, arg2, true); } if (arg0.equals("net.minecraft.client.entity.AbstractClientPlayer")) { System.out.println("********* INSIDE AbstractClientPlayer TRANSFORMER ABOUT TO PATCH: " + arg0); return patchClassASM(arg0, arg2, false); } return arg2; } public byte[] patchClassASM(String name, byte[] bytes, boolean obfuscated) { String targetMethodName = ""; if(obfuscated == true) targetMethodName ="d"; else targetMethodName ="getSkinUrl"; //set up ASM class manipulation stuff. Consult the ASM docs for details ClassNode classNode = new ClassNode(); ClassReader classReader = new ClassReader(bytes); classReader.accept(classNode, 0); //Now we loop over all of the methods declared inside the Explosion class until we get to the targetMethodName "doExplosionB" // find method to inject into @SuppressWarnings("unchecked") Iterator<MethodNode> methods = classNode.methods.iterator(); while(methods.hasNext()) { MethodNode m = methods.next(); System.out.println("********* Method Name: "+m.name + " Desc:" + m.desc); //Check if this is doExplosionB and it's method signature is (Z)V which means that it accepts a boolean (Z) and returns a void (V) if ((m.name.equals(targetMethodName) && m.desc.equals("(Ljava/lang/String;)Ljava/lang/String;"))) { System.out.println("********* Inside target method!"); //on supprime tous les noeuds AbstractInsnNode targetNode = null; @SuppressWarnings("unchecked") Iterator<AbstractInsnNode> iter = m.instructions.iterator(); int index = -1; while (iter.hasNext()) { index++; targetNode = iter.next(); m.instructions.remove(targetNode); } InsnList toInject = new InsnList(); toInject.add(new VarInsnNode(ALOAD, 0)); toInject.add(new MethodInsnNode(INVOKESTATIC, "pickandcraftSkin/PlayerCustom", "getURLSkincustom", "(Ljava/lang/String;)Ljava/lang/String;")); // inject new instruction list into method instruction list m.instructions.insert(toInject); System.out.println("Patching Complete!"); break; } } //ASM specific for cleaning up and returning the final bytes for JVM processing. ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES); classNode.accept(writer); return writer.toByteArray(); } }