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package gtPlusPlus.preloader.asm;
import static org.objectweb.asm.Opcodes.*;
import java.io.File;
import org.apache.logging.log4j.Level;
import org.objectweb.asm.*;
import cpw.mods.fml.relauncher.FMLRelaunchLog;
import gtPlusPlus.core.util.Utils;
import gtPlusPlus.preloader.CORE_Preloader;
import net.minecraft.launchwrapper.IClassTransformer;
import net.minecraftforge.common.config.Configuration;
public class Preloader_ClassTransformer implements IClassTransformer {
public boolean getConfig(){
final Configuration config = new Configuration( new File(Utils.getMcDir(), "config/GTplusplus/GTplusplus.cfg"));
if (config != null){
config.load();
// Circuits
CORE_Preloader.enableOldGTcircuits = config.getBoolean("enableOldGTcircuits", "gregtech", false,
"Restores circuits and their recipes from Pre-5.09.28 times.");
Utils.LOG_INFO("GT++ ASM - Loaded the configuration file.");
return CORE_Preloader.enableOldGTcircuits;
}
Utils.LOG_INFO("GT++ ASM - Failed loading the configuration file.");
return false;
}
@Override
public byte[] transform(String name, String transformedName, byte[] basicClass) {
if(transformedName.equals("net.minecraftforge.oredict.OreDictionary")) {
FMLRelaunchLog.log("[GT++ ASM] 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++ ASM] OreDictTransformer", Level.INFO, "Found target method.");
return new RegisterOreImplVisitor(methodVisitor, false);
}
else if(name.equals("registerOreImpl") && desc.equals("(Ljava/lang/String;Ladd;)V")) {
FMLRelaunchLog.log("[GT++ ASM] OreDictTransformer", Level.INFO, "Found target method. [Obfuscated]");
return new RegisterOreImplVisitor(methodVisitor, true);
}
return methodVisitor;
}
}
private static final class RegisterOreImplVisitor extends MethodVisitor {
private final boolean mObfuscated;
public RegisterOreImplVisitor(MethodVisitor mv, boolean obfuscated) {
super(ASM5, mv);
this.mObfuscated = obfuscated;
}
@Override
public void visitCode() {
FMLRelaunchLog.log("[GT++ ASM] OreDictTransformer", Level.INFO, "Fixing Forge's poor attempt at an oreDictionary.");
super.visitCode();
super.visitVarInsn(ALOAD, 0);
super.visitVarInsn(ALOAD, 1);
if (!mObfuscated){
super.visitMethodInsn(INVOKESTATIC,
"gtPlusPlus/preloader/Preloader_GT_OreDict",
"shouldPreventRegistration",
"(Ljava/lang/String;Lnet/minecraft/item/ItemStack;)Z",
false);
}
else {
super.visitMethodInsn(INVOKESTATIC,
"gtPlusPlus/preloader/Preloader_GT_OreDict",
"shouldPreventRegistration",
"(Ljava/lang/String;Ladd;)Z",
false);
}
Label endLabel = new Label();
super.visitJumpInsn(IFEQ, endLabel);
super.visitInsn(RETURN);
super.visitLabel(endLabel);
}
}
}
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