support opening read-only WAD files

fixes #24
devinacker · Apr 22, 2017 · 582da97 · 582da97
1 parent 261c14c
commit 582da97
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/wadio.py b/wadio.py
@@ -85,7 +85,12 @@ def open(self, filename):
             raise IOError("The handle is already open")
         # Open an existing WAD
         if os.path.exists(filename):
-            self.basefile = open(filename, 'r+b')
+            try:
+                self.basefile = open(filename, 'r+b')
+            except IOError:
+                # assume file is read-only
+                self.basefile = open(filename, 'rb')
+
             filesize = os.stat(self.basefile.name)[6]
             self.header = h = Header(bytes=self.basefile.read(Header._fmtsize))
             if (not h.type in ("PWAD", "IWAD")) or filesize < 12: