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package gtPlusPlus.preloader.asm;
import static org.objectweb.asm.Opcodes.*;
import org.apache.logging.log4j.Level;
import org.objectweb.asm.*;
import cpw.mods.fml.relauncher.FMLRelaunchLog;
import net.minecraft.launchwrapper.IClassTransformer;
public class Preloader_ClassTransformer implements IClassTransformer {
@Override
public byte[] transform(String name, String transformedName, byte[] basicClass) {
if(transformedName.equals("net.minecraftforge.oredict.OreDictionary")) {
FMLRelaunchLog.log("[GT++] OreDictTransformer", Level.INFO, "Transforming %s", transformedName);
ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
new ClassReader(basicClass).accept(new OreDictionaryVisitor(classWriter), 0);
return classWriter.toByteArray();
}
return basicClass;
}
private static final class OreDictionaryVisitor extends ClassVisitor {
public OreDictionaryVisitor(ClassVisitor cv) {
super(ASM5, cv);
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor methodVisitor = super.visitMethod(access, name, desc, signature, exceptions);
if(name.equals("registerOreImpl") && desc.equals("(Ljava/lang/String;Lnet/minecraft/item/ItemStack;)V")) {
FMLRelaunchLog.log("[GT++] OreDictTransformer", Level.INFO, "Found target method.");
return new RegisterOreImplVisitor(methodVisitor);
}
return methodVisitor;
}
}
private static final class RegisterOreImplVisitor extends MethodVisitor {
public RegisterOreImplVisitor(MethodVisitor mv) {
super(ASM5, mv);
}
@SuppressWarnings("deprecation")
@Override
public void visitCode() {
super.visitCode();
super.visitVarInsn(ALOAD, 0);
super.visitVarInsn(ALOAD, 1);
super.visitMethodInsn(INVOKESTATIC,
//"gtPlusPlus/preloader/Preloader_GT_OreDict", "removeCircuit", "(Lnet/minecraft/item/ItemStack;)Z, false");
"gtPlusPlus/preloader/Preloader_GT_OreDict",
"shouldPreventRegistration",
"(Ljava/lang/String;Lnet/minecraft/item/ItemStack;)Z",
false);
Label endLabel = new Label();
super.visitJumpInsn(IFEQ, endLabel);
super.visitInsn(RETURN);
super.visitLabel(endLabel);
}
}
}
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