Fix filename checks

patch.py

 # coding=utf8
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Utility functions to handle patches."""
 
 import posixpath
 import os
 import re
 
@@ skipping 36 matching lines @@
       return self.source_filename.encode('utf-8')
 
   @staticmethod
   def _process_filename(filename):
     filename = filename.replace('\\', '/')
     # Blacklist a few characters for simplicity.
     for i in ('$', '..', '\'', '"', '<', '>', ':', '|', '?', '*'):
       if i in filename:
         raise UnsupportedPatchFormat(
             filename, 'Can\'t use \'%s\' in filename.' % i)
-    for i in ('/', 'CON', 'COM'):
-      if filename.startswith(i):
-        raise UnsupportedPatchFormat(
-            filename, 'Filename can\'t start with \'%s\'.' % i)
+    if filename.startswith('/'):
+      raise UnsupportedPatchFormat(
+          filename, 'Filename can\'t start with \'/\'.')
+    if filename == 'CON':
+      raise UnsupportedPatchFormat(
+          filename, 'Filename can\'t be \'CON\'.')
+    if re.match('COM\d', filename):
+      raise UnsupportedPatchFormat(
+          filename, 'Filename can\'t be \'%s\'.' % filename)
     return filename
 
   def set_relpath(self, relpath):
     if not relpath:
       return
     relpath = relpath.replace('\\', '/')
     if relpath[0] == '/':
       self._fail('Relative path starts with %s' % relpath[0])
     self.filename = self._process_filename(
         posixpath.join(relpath, self.filename))
@@ skipping 463 matching lines @@
   def __iter__(self):
     for patch in self.patches:
       yield patch
 
   def __getitem__(self, key):
     return self.patches[key]
 
   @property
   def filenames(self):
     return [p.filename for p in self.patches]