I don't remember what is in this
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commit
3f8260cf41
@ -1,4 +1,2 @@
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shortcut
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assets
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build
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.gradle
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package com.zivilon.cinder_loe.coremod;
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import net.minecraft.launchwrapper.IClassTransformer;
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import org.objectweb.asm.ClassReader;
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import org.objectweb.asm.ClassWriter;
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import org.objectweb.asm.Opcodes;
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import org.objectweb.asm.tree.ClassNode;
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import org.objectweb.asm.tree.FieldNode;
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import org.objectweb.asm.tree.InsnList;
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import org.objectweb.asm.tree.AbstractInsnNode;
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import org.objectweb.asm.tree.IntInsnNode;
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import org.objectweb.asm.tree.TypeInsnNode;
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import org.objectweb.asm.tree.InsnNode;
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import org.objectweb.asm.tree.LdcInsnNode;
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import org.objectweb.asm.tree.FieldInsnNode;
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import org.objectweb.asm.tree.MethodInsnNode;
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import org.objectweb.asm.tree.MethodNode;
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import java.util.List;
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import java.util.ArrayList;
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public class LOTRShieldAdder implements IClassTransformer {
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public static List<BannerInfo> custom_banners = new ArrayList<>();
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public void registerShields() {
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custom_banners = new ArrayList<>();
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// Arguments: enum name, texture name, ID, faction name
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register("RED_DWARF", "redDwarf", 42, "DURINS_FOLK");
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// register("TEST", "test", 43, "GONDOR");
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}
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@Override
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public byte[] transform(String name, String transformedName, byte[] basicClass) {
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if ("lotr.common.LOTRShields".equals(transformedName)) {
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registerShields();
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// Get class
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ClassReader classReader = new ClassReader(basicClass);
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ClassNode classNode = new ClassNode();
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classReader.accept(classNode, 0);
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// Add the new enum constant
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for (BannerInfo banner : custom_banners) {
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FieldNode newEnumConstant = new FieldNode(
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Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL + Opcodes.ACC_ENUM,
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banner.enum_name,
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"Llotr/common/LOTRShields;",
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null,
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null
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);
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classNode.fields.add(newEnumConstant);
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}
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// Locate <clinit>
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MethodNode clinit = null;
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for (MethodNode method : classNode.methods) {
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if ("<clinit>".equals(method.name)) {
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clinit = method;
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break;
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}
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}
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InsnList insns = clinit.instructions;
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AbstractInsnNode constructor_injection_point = null;
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for (int i = 0; i < insns.size(); i++) {
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AbstractInsnNode insn = insns.get(i);
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// Check if the instruction is a BIPUSH
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if (insn.getOpcode() == Opcodes.BIPUSH) {
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IntInsnNode intInsn = (IntInsnNode) insn;
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// Check if the operand is 42, indicating the size of the $VALUES array
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if (intInsn.operand == 42) {
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// Found the instruction to modify
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constructor_injection_point = insn;
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// Modify the operand from 42 to 43 to account for the new enum constant
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intInsn.operand = 42 + custom_banners.size();
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System.out.println("Enum array length set to " + intInsn.operand);
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System.out.println("Banner list size: " + custom_banners.size());
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break;
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}
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}
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}
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// Create the constructor instructions to add new banner
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InsnList constructor_injection = new InsnList();
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for (BannerInfo banner : custom_banners) {
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constructor_injection.add(new TypeInsnNode(Opcodes.NEW, "lotr/common/item/LOTRItemBanner$BannerType"));
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constructor_injection.add(new InsnNode(Opcodes.DUP));
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System.out.println("Registering with enum " + banner.enum_name);
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constructor_injection.add(new LdcInsnNode(banner.enum_name));
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System.out.println("Registering with identifier " + banner.identifier);
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constructor_injection.add(new LdcInsnNode(banner.identifier));
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constructor_injection.add(new FieldInsnNode(Opcodes.GETSTATIC, "lotr/common/fac/LOTRFaction", banner.faction, "Llotr/common/fac/LOTRFaction;"));
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constructor_injection.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "lotr/common/item/LOTRItemBanner$BannerType", "<init>", "(Ljava/lang/String;IILjava/lang/String;Llotr/common/fac/LOTRFaction;)V", false));
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constructor_injection.add(new FieldInsnNode(Opcodes.PUTSTATIC, "lotr/common/item/LOTRItemBanner$BannerType", banner.enum_name, "Llotr/common/item/LOTRItemBanner$BannerType;"));
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}
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// Insert the new instructions
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if (constructor_injection_point != null) {
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insns.insertBefore(constructor_injection_point, constructor_injection);
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}
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// Modifying the $VALUES array
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// Create new instruction list to be injected later
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InsnList values_array_injection = new InsnList();
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// Add instructions to the instruction list
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for (BannerInfo banner : custom_banners) {
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values_array_injection.add(new InsnNode(Opcodes.DUP));
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values_array_injection.add(new FieldInsnNode(Opcodes.GETSTATIC, "lotr/common/item/LOTRItemBanner$BannerType", banner.enum_name, "Llotr/common/item/LOTRItemBanner$BannerType;"));
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values_array_injection.add(new InsnNode(Opcodes.AASTORE));
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}
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// Find the putstatic instruction for $VALUES
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// This is where the fields are injected into a list, we want to inject our instructions before this
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AbstractInsnNode values_injection_point = null;
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while (constructor_injection_point != null) {
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constructor_injection_point = constructor_injection_point.getNext();
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if (constructor_injection_point.getOpcode() == Opcodes.PUTSTATIC) {
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values_injection_point = constructor_injection_point;
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break;
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}
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}
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// Insert the new instructions before the putstatic instruction
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if (values_injection_point != null) {
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insns.insertBefore(values_injection_point, values_array_injection);
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}
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// Write the modified class back to a byte array
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ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
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classNode.accept(classWriter);
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return classWriter.toByteArray(); // Return the modified class
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}
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return basicClass; // Return the unmodified class for all other classes
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}
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public void register(String enum_name, String identifier, int ordinal, String faction) {
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System.out.println("Registering banner " + enum_name + " " + identifier);
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custom_banners.add(new BannerInfo(enum_name, identifier, ordinal, faction));
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}
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public class BannerInfo {
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String enum_name;
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String identifier;
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int ordinal;
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String faction;
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public BannerInfo(String enum_name, String identifier, int ordinal, String faction) {
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this.enum_name = enum_name;
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this.identifier = identifier;
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this.ordinal = ordinal;
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this.faction = faction;
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}
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}
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}
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