Add fix for Full Metal Daemon Muramasa (#114)

* Add fix for Full Metal Daemon Muramasa

* Implement fix for Full Metal Daemon Muramasa

gamefixes-gog/umu-1209310984.py

@@ -0,0 +1,58 @@
+"""Game fix for Full Metal Daemon Muramasa
+
+This game is borked on gog due to audio synchronization (xaudio) issues. To
+make this game playable, xaudio2_9.dll simply needs to be in the game
+directory and renamed to xaudio2_8.dll.
+"""
+
+import os
+from gzip import open as gzip_open
+from hashlib import sha256
+from tempfile import mkdtemp
+from urllib.request import urlopen
+
+from protonfixes import util
+from protonfixes.logger import log
+
+
+def main():
+    arc = "https://github.com/user-attachments/files/16788423/xaudio2_8.dll.gz"
+    hashsum_file = "173cac0a7931989d66338e0d7779e451f2f01b2377903df7954d86c07c1bc8fb"
+    tmp = f"{mkdtemp()}/xaudio2_8.dll.gz"
+    hashsum = sha256()
+    path_dll = f"{util.get_game_install_path()}/xaudio2_8.dll"
+
+    # Full Metal Daemon from gog will not have the xaudio2_8.dll
+    if os.path.exists(path_dll):
+        log.info(
+            f"xaudio2_8.dll exists in '{util.get_game_install_path()}', skipping..."
+        )
+        return
+
+    # Download the archive
+    with urlopen(arc, timeout=30) as resp:
+        if resp.status != 200:
+            log.warn(f"github returned the status code: {resp.status}")
+            return
+
+        with open(tmp, mode="wb", buffering=0) as file:
+            chunk_size = 64 * 1024  # 64 KB
+            buffer = bytearray(chunk_size)
+            view = memoryview(buffer)
+
+            while size := resp.readinto(buffer):
+                file.write(view[:size])
+                hashsum.update(view[:size])
+
+    # Verify the compessed file
+    if hashsum_file != hashsum.hexdigest():
+        log.warn(f"Digest mismatch: {arc}")
+        log.warn(f"Expected '{hashsum_file}', skipping...")
+        return
+
+    # Write xaudio2_8.dll to the game directory
+    # NOTE: The file is actually xaudio2_9.dll from winetricks but renamed
+    log.info("Applying fix for 'Full Metal Daemon Muramasa'...")
+    with gzip_open(tmp, "rb") as reader:
+        with open(path_dll, "wb") as writer:
+            writer.write(reader.read())