    001/*
    002 * Forge Mod Loader
    003 * Copyright (c) 2012-2013 cpw.
    004 * All rights reserved. This program and the accompanying materials
    005 * are made available under the terms of the GNU Lesser Public License v2.1
    006 * which accompanies this distribution, and is available at
    007 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    008 *
    009 * Contributors:
    010 *     cpw - implementation
    011 */
    012
    013package cpw.mods.fml.common.asm;
    014
    015import org.objectweb.asm.ClassReader;
    016import org.objectweb.asm.ClassWriter;
    017import org.objectweb.asm.Opcodes;
    018import org.objectweb.asm.Type;
    019import org.objectweb.asm.tree.ClassNode;
    020
    021import cpw.mods.fml.common.registry.BlockProxy;
    022import cpw.mods.fml.relauncher.IClassTransformer;
    023
    024public class ASMTransformer implements IClassTransformer
    025{
    026    @Override
    027    public byte[] transform(String name,String transformedName, byte[] bytes)
    028    {
    029        if ("net.minecraft.src.Block".equals(name))
    030        {
    031            ClassReader cr = new ClassReader(bytes);
    032            ClassNode cn = new ClassNode(Opcodes.ASM4);
    033            cr.accept(cn, ClassReader.EXPAND_FRAMES);
    034            cn.interfaces.add(Type.getInternalName(BlockProxy.class));
    035            ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    036            cn.accept(cw);
    037            return cw.toByteArray();
    038        }
    039
    040        return bytes;
    041    }
    042
    043}