forge/src/main/resources/META-INF/NetworkManager.js

   1 var Opcodes = Java.type("org.objectweb.asm.Opcodes");
   2 var LabelNode = Java.type("org.objectweb.asm.tree.LabelNode");
   3 var VarInsnNode = Java.type("org.objectweb.asm.tree.VarInsnNode");
   4 var MethodInsnNode = Java.type("org.objectweb.asm.tree.MethodInsnNode");
   5 var ASMAPI = Java.type("net.minecraftforge.coremod.api.ASMAPI");
   6
   7 function initializeCoreMod() {
   8     return {
   9         "light-overlay-forge": {
  10             'target': {
  11                 'type': 'CLASS',
  12                 'name': 'net.minecraft.network.NetworkManager'
  13             },
  14             'transformer': function (classNode) {
  15                 var processPacket = ASMAPI.mapMethod("func_197664_a");
  16                 for (i in classNode.methods) {
  17                     var method = classNode.methods[i];
  18                     if (method.name === processPacket) {
  19                         var instructions = method.instructions;
  20                         var insnArray = instructions.toArray();
  21                         for (j in insnArray) {
  22                             var instruction = insnArray[j];
  23                             if (instruction instanceof LabelNode) {
  24                                 instructions.insertBefore(instruction, new LabelNode());
  25                                 instructions.insertBefore(instruction, new VarInsnNode(Opcodes.ALOAD, 0));
  26                                 instructions.insertBefore(instruction, new MethodInsnNode(Opcodes.INVOKESTATIC, "me/shedaniel/lightoverlay/forge/LightOverlay", "processPacket", "(Lnet/minecraft/network/IPacket;)V", false));
  27                                 break;
  28                             }
  29                         }
  30                         break;
  31                     }
  32                 }
  33                 return classNode;
  34             }
  35         }
  36     }
  37 }