Java tutorial
/* * This file is part of Dynamic Surroundings, licensed under the MIT License (MIT). * * Copyright (c) OreCruncher * * 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 org.blockartistry.mod.DynSurround.asm; import static org.objectweb.asm.Opcodes.*; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.tree.ClassNode; import org.objectweb.asm.tree.InsnList; import org.objectweb.asm.tree.InsnNode; import org.objectweb.asm.tree.MethodInsnNode; import org.objectweb.asm.tree.MethodNode; import org.objectweb.asm.tree.VarInsnNode; import net.minecraft.launchwrapper.IClassTransformer; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; public class Transformer implements IClassTransformer { private static final Logger logger = LogManager.getLogger("dsurround Transform"); @Override public byte[] transform(String name, String transformedName, byte[] basicClass) { if ("net.minecraft.client.renderer.EntityRenderer".equals(name) || "bnz".equals(name) || "bnd".equals(name)) { logger.debug("Transforming EntityRenderer..."); return transformEntityRenderer(basicClass); } else if ("net.minecraft.world.WorldServer".equals(name) || "ls".equals(name) || "lq".equals(name)) { logger.debug("Transforming WorldServer..."); return transformWorldServer(basicClass); } else if ("net.minecraft.world.World".equals(name) || "aid".equals(name) || "aht".equals(name)) { logger.debug("Transforming World..."); return transformWorld(basicClass); } else if ("net.minecraft.client.audio.SoundManager".equals(name) || "bzu".equals(name) || "byt".equals(name)) { logger.debug("Transforming SoundManager..."); return transformSoundManager(basicClass); } return basicClass; } private byte[] transformEntityRenderer(final byte[] classBytes) { final String names[]; if (TransformLoader.runtimeDeobEnabled) names = new String[] { "func_78474_d", "func_78484_h" }; else names = new String[] { "renderRainSnow", "addRainParticles" }; final String targetName[] = new String[] { "renderRainSnow", "addRainParticles" }; final ClassReader cr = new ClassReader(classBytes); final ClassNode cn = new ClassNode(ASM5); cr.accept(cn, 0); for (final MethodNode m : cn.methods) { if (m.name.equals(names[0])) { logger.debug("Hooking " + names[0]); final InsnList list = new InsnList(); list.add(new VarInsnNode(ALOAD, 0)); list.add(new VarInsnNode(FLOAD, 1)); final String sig = "(Lnet/minecraft/client/renderer/EntityRenderer;F)V"; list.add(new MethodInsnNode(INVOKESTATIC, "org/blockartistry/mod/DynSurround/client/RenderWeather", targetName[0], sig, false)); list.add(new InsnNode(RETURN)); m.instructions.insertBefore(m.instructions.getFirst(), list); } else if (m.name.equals(names[1])) { logger.debug("Hooking " + names[1]); final InsnList list = new InsnList(); list.add(new VarInsnNode(ALOAD, 0)); final String sig = "(Lnet/minecraft/client/renderer/EntityRenderer;)V"; list.add(new MethodInsnNode(INVOKESTATIC, "org/blockartistry/mod/DynSurround/client/RenderWeather", targetName[1], sig, false)); list.add(new InsnNode(RETURN)); m.instructions.insertBefore(m.instructions.getFirst(), list); } } final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); cn.accept(cw); return cw.toByteArray(); } private byte[] transformWorldServer(final byte[] classBytes) { final String names[]; if (TransformLoader.runtimeDeobEnabled) names = new String[] { "func_73051_P" }; else names = new String[] { "resetRainAndThunder" }; final String targetName[] = new String[] { "resetRainAndThunder" }; final ClassReader cr = new ClassReader(classBytes); final ClassNode cn = new ClassNode(ASM5); cr.accept(cn, 0); for (final MethodNode m : cn.methods) { if (m.name.equals(names[0])) { logger.debug("Hooking " + names[0]); InsnList list = new InsnList(); list.add(new VarInsnNode(ALOAD, 0)); final String sig = "(Lnet/minecraft/world/WorldServer;)V"; list.add(new MethodInsnNode(INVOKESTATIC, "org/blockartistry/mod/DynSurround/server/PlayerSleepHandler", targetName[0], sig, false)); list.add(new InsnNode(RETURN)); m.instructions.insertBefore(m.instructions.getFirst(), list); break; } } final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); cn.accept(cw); return cw.toByteArray(); } private byte[] transformWorld(final byte[] classBytes) { final String names[]; if (TransformLoader.runtimeDeobEnabled) names = new String[] { "updateWeatherBody", "func_72896_J", "func_72911_I" }; else names = new String[] { "updateWeatherBody", "isRaining", "isThundering" }; final String targetName[] = new String[] { "updateWeatherBody", "isRaining", "isThundering" }; final ClassReader cr = new ClassReader(classBytes); final ClassNode cn = new ClassNode(ASM5); cr.accept(cn, 0); for (final MethodNode m : cn.methods) { int idx = -1; if (m.name.equals(names[0])) idx = 0; else if (m.name.equals(names[1])) idx = 1; else if (m.name.equals(names[2])) idx = 2; else continue; logger.debug("Hooking " + names[idx]); InsnList list = new InsnList(); list.add(new VarInsnNode(ALOAD, 0)); final String sig; if (idx == 0) sig = "(Lnet/minecraft/world/World;)V"; else sig = "(Lnet/minecraft/world/World;)Z"; list.add(new MethodInsnNode(INVOKESTATIC, "org/blockartistry/mod/DynSurround/server/WorldHandler", targetName[idx], sig, false)); if (idx == 0) list.add(new InsnNode(RETURN)); else list.add(new InsnNode(IRETURN)); m.instructions.insertBefore(m.instructions.getFirst(), list); } final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); cn.accept(cw); return cw.toByteArray(); } private byte[] transformSoundManager(final byte[] classBytes) { final String names[]; if (TransformLoader.runtimeDeobEnabled) names = new String[] { "func_188770_e" }; else names = new String[] { "getClampedVolume" }; final String targetName[] = new String[] { "getClampedVolume" }; final ClassReader cr = new ClassReader(classBytes); final ClassNode cn = new ClassNode(ASM5); cr.accept(cn, 0); for (final MethodNode m : cn.methods) { if (m.name.equals(names[0])) { logger.debug("Hooking " + names[0]); final InsnList list = new InsnList(); list.add(new VarInsnNode(ALOAD, 1)); final String sig = "(Lnet/minecraft/client/audio/ISound;)F"; list.add(new MethodInsnNode(INVOKESTATIC, "org/blockartistry/mod/DynSurround/client/sound/SoundManager", targetName[0], sig, false)); list.add(new InsnNode(FRETURN)); m.instructions.insertBefore(m.instructions.getFirst(), list); break; } } final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); cn.accept(cw); return cw.toByteArray(); } }