Tue Dec 20 11:36:01 UTC 2005  nils@ndecker.de
  * show raw for noncompressed patches
diff -rN -u old-darcsweb/darcsweb.cgi new-darcsweb/darcsweb.cgi
--- old-darcsweb/darcsweb.cgi	2015-10-09 21:54:03.000000000 +0000
+++ new-darcsweb/darcsweb.cgi	2015-10-09 21:54:03.000000000 +0000
@@ -753,7 +753,14 @@
 	realf = filter_file(config.repodir + '/_darcs/patches/' + hash)
 	if not os.path.isfile(realf):
 		return None
-	dsrc = gzip.open(realf)
+        file = open(realf, 'rb')
+        if file.read(2) == '\x1f\x8b':
+            # file begins with gzip magic
+            file.close()
+            dsrc = gzip.open(realf)
+        else:
+            file.seek(0)
+            dsrc = file
 	return dsrc
 
 def get_darcs_diff(hash, fname = None):