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

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

worlds/lufia2ac/basepatch/__init__.py

@@ -0,0 +1,47 @@
+import os
+
+import bsdiff4
+
+from ..Rom import get_base_rom_bytes
+
+
+def apply_basepatch(base_rom_bytes: bytes) -> bytes:
+    with open(os.path.join(os.path.dirname(__file__), "basepatch.bsdiff4"), "rb") as basepatch:
+        delta: bytes = basepatch.read()
+    return bsdiff4.patch(base_rom_bytes, delta)
+
+
+def create_basepatch() -> None:
+    from .asar import close as asar_close, geterrors as asar_errors, getprints as asar_prints, \
+        getwarnings as asar_warnings, init as asar_init, patch as asar_patch
+
+    os.add_dll_directory(os.path.dirname(__file__))
+    print("Initializing Asar library")
+    asar_init()
+
+    print("Opening base ROM")
+    old_rom_data: bytes = get_base_rom_bytes()
+
+    print("Patching base ROM")
+    result, new_rom_data = asar_patch(os.path.join(os.path.dirname(__file__), "basepatch.asm"), old_rom_data)
+
+    warnings = asar_warnings()
+    print("\nWarnings: " + str(len(warnings)))
+    for w in warnings:
+        print(w)
+
+    if result:
+        print("Success")
+        for p in asar_prints():
+            print(p)
+        asar_close()
+        delta: bytes = bsdiff4.diff(old_rom_data, new_rom_data)
+        with open(os.path.join(os.path.dirname(__file__), "basepatch.bsdiff4"), "wb") as f:
+            f.write(delta)
+    else:
+        errors = asar_errors()
+        print("\nErrors: " + str(len(errors)))
+        for error in errors:
+            print(error)
+        asar_close()
+        raise RuntimeError("Asar errors while trying to create basepatch for Lufia II Ancient Cave.")