Add EntryWiped to pack_firmware_image

utility/pack_firmware_image

 #!/usr/bin/env python2.6
 
 # Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import re
 import struct
 import subprocess
@@ skipping 106 matching lines @@
 class EntryFmapArea(Entry):
 
   def __init__(self, **kwargs):
     Entry._CheckFields(kwargs, ('flags',))
     super(EntryFmapArea, self).__init__(**kwargs)
 
   def Pack(self, firmware_image, entries):
     pass
 
 
+class EntryWiped(EntryFmapArea):
+
+  def __init__(self, **kwargs):
+    Entry._CheckFields(kwargs, ('wipe_value',))
+    super(EntryWiped, self).__init__(**kwargs)
+    if type(self.wipe_value) is int:
+      try:
+        self.wipe_value = chr(self.wipe_value)
+      except ValueError as e:
+        raise PackError('cannot convert wipe_value to a character: %s' % str(e))
+    elif type(self.wipe_value) is str:
+      if len(self.wipe_value) != 1:
+        raise PackError('wipe_value out of range [00:ff]: %s' %
+            repr(self.wipe_value))
+    else:
+      raise PackError('wipe_value is neither int nor str: %s' %
+          repr(self.wipe_value))
+
+  def Pack(self, firmware_image, entries):
+    firmware_image.seek(self.offset)
+    firmware_image.write(self.wipe_value * self.length)
+
+
 class EntryBlob(EntryFmapArea):
 
   def __init__(self, **kwargs):
     Entry._CheckFields(kwargs, ('path',))
     super(EntryBlob, self).__init__(**kwargs)
 
   def Pack(self, firmware_image, entries):
     size = os.stat(self.path).st_size
     if size > self.length:
       raise PackError('blob too large: %s: %d > %d' %
@@ skipping 127 matching lines @@
       raise ConfigError('undefined variable: %s' % varname)
     _Info('%s = %s' % (varname, repr(env[varname])))
 
   pack_firmware_image(env['ENTRIES'], env['OUTPUT'], env['SIZE'])
 
   sys.exit(0)
 
 
 if __name__ == '__main__':
   main()