Lufia II Ancient Cave: implement new game (#1218)

Co-authored-by: wordfcuk <greili1985@gmail.com>

worlds/lufia2ac/Rom.py

@@ -0,0 +1,43 @@
+import hashlib
+import os
+from typing import Optional
+
+import Utils
+from Utils import OptionsType
+from worlds.Files import APDeltaPatch
+
+L2USHASH: str = "6efc477d6203ed2b3b9133c1cd9e9c5d"
+
+
+class L2ACDeltaPatch(APDeltaPatch):
+    hash = L2USHASH
+    game = "Lufia II Ancient Cave"
+    patch_file_ending = ".apl2ac"
+
+    @classmethod
+    def get_source_data(cls) -> bytes:
+        return get_base_rom_bytes()
+
+
+def get_base_rom_bytes(file_name: str = "") -> bytes:
+    base_rom_bytes: Optional[bytes] = getattr(get_base_rom_bytes, "base_rom_bytes", None)
+    if not base_rom_bytes:
+        file_name: str = get_base_rom_path(file_name)
+        base_rom_bytes = bytes(Utils.read_snes_rom(open(file_name, "rb")))
+
+        basemd5 = hashlib.md5()
+        basemd5.update(base_rom_bytes)
+        if L2USHASH != basemd5.hexdigest():
+            raise Exception("Supplied Base Rom does not match known MD5 for US release. "
+                            "Get the correct game and version, then dump it")
+        get_base_rom_bytes.base_rom_bytes = base_rom_bytes
+    return base_rom_bytes
+
+
+def get_base_rom_path(file_name: str = "") -> str:
+    options: OptionsType = Utils.get_options()
+    if not file_name:
+        file_name = options["lufia2ac_options"]["rom_file"]
+    if not os.path.exists(file_name):
+        file_name = Utils.user_path(file_name)
+    return file_name