Support all .wpak files with a wpak target

Replaces the config target with wpak, which handles every known pak or a
single one named on the command line. Map icon .tga entries are stored
unencrypted (sb.exe 0xAACA60).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mbEditorPro2.0/arcane/util/ArcWpak.py

@@ -13,7 +13,8 @@ import zipfile
 from .ArcFileCache import next_available_path
 
 # A .wpak is a zip (client uses minizip, ArcWPakFile 0x54D3C0) whose entries are
-# each Blowfish CFB-64 encrypted with a zero IV (BF_cfb64_encrypt 0xCD9000).
+# each Blowfish CFB-64 encrypted with a zero IV (BF_cfb64_encrypt 0xCD9000),
+# except image entries.
 WPAK_KEY = bytes([
     0x85, 0x71, 0x40, 0x3C, 0x14, 0x50, 0x0B, 0x52,
     0x73, 0x2D, 0x10, 0x08, 0x63, 0x59, 0x5B, 0xAA,
@@ -21,6 +22,9 @@ WPAK_KEY = bytes([
 
 WPAK_COMPRESS_LEVEL = 9  # zipOpenNewFileInZip level in ArcWPakFile writer
 
+# Map icon paks keep their .tga entries unencrypted (LoadMapZoneData 0xAACA60).
+WPAK_PLAIN_EXTENSIONS = ('.tga',)
+
 MASK32 = 0xFFFFFFFF
 
 
@@ -129,6 +133,10 @@ class ArcBlowfish:
 WPAK_CIPHER = ArcBlowfish(WPAK_KEY)
 
 
+def is_encrypted_entry(filename):
+    return not filename.lower().endswith(WPAK_PLAIN_EXTENSIONS)
+
+
 def load_wpak_file(filename):
     entries = []
 
@@ -136,10 +144,10 @@ def load_wpak_file(filename):
         for info in wpak_file.infolist():
             if info.is_dir():
                 continue
-            entries.append([
-                info.filename,
-                WPAK_CIPHER.cfb64_decrypt(wpak_file.read(info))
-            ])
+            data = wpak_file.read(info)
+            if is_encrypted_entry(info.filename):
+                data = WPAK_CIPHER.cfb64_decrypt(data)
+            entries.append([info.filename, data])
 
     return entries
 
@@ -147,7 +155,7 @@ def load_wpak_file(filename):
 def load_wpak_directory(directory):
     entries = []
 
-    # Original archives list entries in NTFS directory order (uppercase-folded sort).
+    # Client finds entries by name (unzLocateFile 0xCD7920), so order only needs to be stable.
     for filename in sorted(os.listdir(directory), key=str.upper):
         filepath = os.path.join(directory, filename)
         if not os.path.isfile(filepath):
@@ -163,11 +171,9 @@ def build_wpak_bytes(entries, wpak_file):
         for filename, data in entries:
             info = zipfile.ZipInfo(filename, date_time=time.localtime()[:6])
             info.compress_type = zipfile.ZIP_DEFLATED
-            archive.writestr(
-                info,
-                WPAK_CIPHER.cfb64_encrypt(data),
-                compresslevel=WPAK_COMPRESS_LEVEL
-            )
+            if is_encrypted_entry(filename):
+                data = WPAK_CIPHER.cfb64_encrypt(data)
+            archive.writestr(info, data, compresslevel=WPAK_COMPRESS_LEVEL)
 
 
 def save_wpak_file(filename, entries):