LiteLoaderTransformer.java
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/*
* This file is part of LiteLoader.
* Copyright (C) 2012-16 Adam Mummery-Smith
* All Rights Reserved.
*/
package com.mumfrey.liteloader.launch;
import org.spongepowered.asm.lib.Opcodes;
import org.spongepowered.asm.lib.tree.ClassNode;
import org.spongepowered.asm.lib.tree.FieldNode;
import org.spongepowered.asm.lib.tree.MethodInsnNode;
import org.spongepowered.asm.lib.tree.MethodNode;
import com.mumfrey.liteloader.core.runtime.Obf;
import com.mumfrey.liteloader.transformers.ClassTransformer;
public class LiteLoaderTransformer extends ClassTransformer
{
private static final String LITELOADER_TWEAKER_CLASS = LiteLoaderTweaker.class.getName().replace('.', '/');
private static final String METHOD_PRE_BEGIN_GAME = "preBeginGame";
@Override
public byte[] transform(String name, String transformedName, byte[] basicClass)
{
if (basicClass == null) return basicClass;
if (Obf.MinecraftMain.name.equals(transformedName))
{
return this.transformMain(basicClass);
}
else if (Obf.Blocks.obf.equals(transformedName)
|| Obf.Blocks.name.equals(transformedName)
|| Obf.Items.obf.equals(transformedName)
|| Obf.Items.name.equals(transformedName))
{
return this.stripFinalModifiers(basicClass);
}
return basicClass;
}
private byte[] transformMain(byte[] basicClass)
{
ClassNode classNode = this.readClass(basicClass, true);
for (MethodNode method : classNode.methods)
{
if ("main".equals(method.name))
{
method.instructions.insert(new MethodInsnNode(Opcodes.INVOKESTATIC, LiteLoaderTransformer.LITELOADER_TWEAKER_CLASS,
LiteLoaderTransformer.METHOD_PRE_BEGIN_GAME, "()V", false));
}
}
return this.writeClass(classNode);
}
private byte[] stripFinalModifiers(byte[] basicClass)
{
ClassNode classNode = this.readClass(basicClass, true);
for (FieldNode field : classNode.fields)
{
field.access = field.access & ~Opcodes.ACC_FINAL;
}
return this.writeClass(classNode);
}
}