Initial commit

src/main/java/emu/grasscutter/net/packet/PacketOpcodesUtil.java

@@ -0,0 +1,44 @@
+package emu.grasscutter.net.packet;
+
+import java.io.BufferedWriter;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.lang.reflect.Field;
+
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+
+public class PacketOpcodesUtil {
+	private static Int2ObjectMap<String> opcodeMap;
+	
+	static {
+		opcodeMap = new Int2ObjectOpenHashMap<String>();
+
+		Field[] fields = PacketOpcodes.class.getFields();
+
+		for (Field f : fields) {
+			try {
+				opcodeMap.put(f.getInt(null), f.getName());
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	public static String getOpcodeName(int opcode) {
+		if (opcode <= 0) return "UNKNOWN";
+		return opcodeMap.getOrDefault(opcode, "UNKNOWN");
+	}
+
+	public static void dumpOpcodes() {
+		try {
+			BufferedWriter out = new BufferedWriter(new FileWriter("opcodes.ini"));
+			for (Int2ObjectMap.Entry<String> entry : opcodeMap.int2ObjectEntrySet()) {
+				out.write(String.format("%04X=%s%s", entry.getIntKey(), entry.getValue(), System.lineSeparator()));
+			}
+			out.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+}