A utility script to manipulate and extract resources from Windows programs.

chrome/tools/build/win/resedit.py

Index: chrome/tools/build/win/resedit.py
diff --git a/chrome/tools/build/win/resedit.py b/chrome/tools/build/win/resedit.py
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+#!/usr/bin/env python
+# Copyright (c) 2011 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.
+
+"""A utility script that can extract and edit resources in a Windows binary.
+
+For detailed help, see the script's usage by invoking it with --help."""
+
+import ctypes
+import ctypes.wintypes
+import logging
+import optparse
+import os
+import shutil
+import sys
+import tempfile
+import win32api
+import win32con
+
+
+_LOGGER = logging.getLogger(__name__)
+
+
+# The win32api-supplied UpdateResource wrapper unfortunately does not allow

[grt (UTC plus 2), 2011/12/02 02:38:11]

is there an appropriate place to file a bug for this?

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

I don't know. This'd be in the win32api module implementation.  I don't know who
maintains it.

+# one to remove resources due to overzeolus parameter verification.

[robertshield, 2011/12/02 00:35:42]

overzealous

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Done.

+# For that case we're foced to go straight to the native API implementation.

[robertshield, 2011/12/02 00:35:42]

forced

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Done.

+UpdateResource = ctypes.windll.kernel32.UpdateResourceW
+UpdateResource.argtypes = [
+    ctypes.wintypes.HANDLE,  # HANDLE hUpdate
+    ctypes.c_wchar_p,  # LPCTSTR lpType
+    ctypes.c_wchar_p,  # LPCTSTR lpName
+    ctypes.c_short,  # WORD wLanguage
+    ctypes.c_void_p,  # LPVOID lpData
+    ctypes.c_ulong,  # DWORD cbData
+    ]
+UpdateResource.restype = ctypes.c_short
+
+
+def _ResIdToString(res_id):
+  # Convert integral res types/ids to a string.
+  if isinstance(res_id, int):
+    return "#%d" % res_id
+
+  return res_id
+
+
+class _ResourceEditor(object):
+  """A utility class to make it easy to extract and manipulate resources in a
+  Windows binary."""
+
+  def __init__(self, input_file, output_file):
+    """Create a new editor.
+
+    Args:
+        input_file: path to the input file.
+        output_file: (optional) path to the output file.
+    """
+    self._input_file = input_file
+    self._output_file = output_file
+    self._modified = False
+    self._module = None
+    self._temp_dir = None
+    self._update_handle = None
+
+  def __del__(self):
+    if self._module:
+      win32api.FreeLibrary(self._module)
+      self._module = None
+
+    if self._update_handle:
+      _LOGGER.info('Canceling edits to "%s".', self.input_file)
+      win32api.EndUpdateResource(self._update_handle, False)
+      self._update_handle = None
+
+    if self._temp_dir:
+      _LOGGER.info('Removing temporary directory "%s".', self._temp_dir)
+      shutil.rmtree(self._temp_dir)
+      self._temp_dir = None
+
+  def _GetModule(self):
+    if not self._module:
+      # Specify a full path to LoadLibraryEx to prevent
+      # it from searching the path.
+      input_file = os.path.abspath(self.input_file)
+      _LOGGER.info('Loading input_file from "%s"', input_file)
+      self._module = win32api.LoadLibraryEx(
+          input_file, None, win32con.LOAD_LIBRARY_AS_DATAFILE)

[robertshield, 2011/12/02 00:35:42]

does this raise an exception with a readable error message on failure?

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Yups, you get the API call, the error code and the stack trace to output. That's
how all of win32api works.

+    return self._module
+
+  def _GetTempDir(self):
+    if not self._temp_dir:
+      self._temp_dir = tempfile.mkdtemp()
+      _LOGGER.info('Created temporary directory "%s".', self._temp_dir)
+
+    return self._temp_dir
+
+  def _GetUpdateHandle(self):
+    if not self._update_handle:
+      # Make a copy of the input file in the temp dir.
+      file_copy = os.path.join(self.temp_dir,

[grt (UTC plus 2), 2011/12/02 02:38:11]

how about keeping this value in the instance so you don't have to recompute it
in Commit? 

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Done.

+                               os.path.basename(self._input_file))
+      shutil.copyfile(self._input_file, file_copy)
+      # Open a resource update handle on the copy.
+      _LOGGER.info('Opening temp file "%s".', file_copy)
+      self._update_handle = win32api.BeginUpdateResource(file_copy, False)
+
+    return self._update_handle
+
+  modified = property(lambda self: self._modified)
+  input_file = property(lambda self: self._input_file)
+  module = property(_GetModule)
+  temp_dir = property(_GetTempDir)
+  update_handle = property(_GetUpdateHandle)
+
+  def ExtractAllToDir(self, extract_to):
+    """Extracts all resources from our input file to a directory hierarchy
+    in the directory named extract_to.
+
+    The generated directory hierarchy is three-level, and looks like:
+      resource-type/
+        resource-name/
+          lang-id.
+
+    Args:
+      extract_to: path to the folder to output to. This folder will be erased
+          and recreated if it already exists.
+    """
+    _LOGGER.info('Extracting all resources from "%s" to directory "%s".',
+        self.input_file, extract_to)
+
+    if os.path.exists(extract_to):
+      _LOGGER.info('Destination directory "%s" exists, deleting', extract_to)
+      shutil.rmtree(extract_to)
+
+    # Make sure the destination dir exists.
+    os.makedirs(extract_to)
+
+    # Now enumerate the resource types.
+    for res_type in win32api.EnumResourceTypes(self.module):
+      res_type_str = _ResIdToString(res_type)
+
+      # And the resource names.
+      for res_name in win32api.EnumResourceNames(self.module, res_type):
+        res_name_str = _ResIdToString(res_name)
+
+        # Then the languages.
+        for res_lang in win32api.EnumResourceLanguages(self.module,
+            res_type, res_name):
+          res_lang_str = _ResIdToString(res_lang)
+
+          dest_dir = os.path.join(extract_to, res_type_str, res_lang_str)
+          dest_file = os.path.join(dest_dir, res_name_str)
+          _LOGGER.info('Extracting resource "%s", lang "%d" name "%s" '
+                       'to file "%s".',
+                       res_type_str, res_lang, res_name_str, dest_file)
+
+          # Extract each resource to a file in the output dir.
+          os.makedirs(dest_dir)
+          with open(dest_file, 'wb') as f:
+            f.write(win32api.LoadResource(self.module, res_type, res_name))

[grt (UTC plus 2), 2011/12/02 02:38:11]

This appears to be using FindResource rather than FindResourceEx, so your guess
is as good as mine as to how multiple languages will be handled.  If win32api
doesn't provide a variant that takes a langid, I suggest you roll your own.

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

It does take a langid as an optional param, my oversight. Good catch!

+
+  def ExtractResource(self, res_type, res_name, dest_file):
+    """Extracts a given resource, specified by type and name, to a given file.
+
+    Args:
+      res_type: the type of the resource, e.g. "B7".
+      res_name: the name of the resource, e.g. "SETUP.EXE".
+      dest_file: path to the file where the resource data will be written.
+    """
+    _LOGGER.info('Extracting resource "%s:%s" to file "%s".',
+        res_type, res_name, dest_file)
+
+    with open(dest_file, 'wb') as f:
+      f.write(win32api.LoadResource(self.module, res_type, res_name))

[grt (UTC plus 2), 2011/12/02 02:38:11]

See previous comment.

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Done.

+
+  def RemoveResource(self, res_type, res_lang, res_name):
+    """Removes a given resource, specified by type, language id and name.
+
+    Args:
+      res_type: the type of the resource, e.g. "B7".
+      res_lang: the language id of the resource, e.g. 1033.
+      res_name: the name of the resource, e.g. "SETUP.EXE".
+    """
+    _LOGGER.info('Removing resource "%s:%s".', res_type, res_name)
+    # We have to go native to perform a removal.
+    ret = UpdateResource(self.update_handle,
+                         res_type,
+                         res_name,
+                         res_lang,
+                         None,
+                         0)
+    # Raise an error on failure.
+    if ret == 0:
+      error = win32api.GetLastError()
+      print "error", error
+      raise RuntimeError(error)
+    self._modified = True
+
+  def UpdateResource(self, res_type, res_lang, res_name, file_path):
+    """Inserts or updates a given resource with the contents of a file.
+
+    Args:
+      res_type: the type of the resource, e.g. "B7".
+      res_lang: the language id of the resource, e.g. 1033.
+      res_name: the name of the resource, e.g. "SETUP.EXE".
+      file_path: path to the file containing the new resource data.
+    """
+    _LOGGER.info('Writing resource "%s:%s" from file.',
+        res_type, res_name, file_path)
+
+    with open(file_path, 'rb') as f:
+      win32api.UpdateResource(self.update_handle,
+                              res_type,
+                              res_name,
+                              f.read(),
+                              res_lang);
+
+    self._modified = True
+
+  def Commit(self):
+    """Commit any successful resource edits this editor has performed.
+
+    This has the effect of writing the output file.
+    """
+    if self._update_handle:
+      update_handle = self._update_handle
+      self._update_handle = None
+      win32api.EndUpdateResource(update_handle, False)
+
+    temp_file = os.path.join(self.temp_dir, os.path.basename(self.input_file))
+    _LOGGER.info('Writing edited file to "%s".', self._output_file)
+    shutil.copyfile(temp_file, self._output_file)
+
+
+_USAGE = """\
+usage: %prog [options] input_file
+
+A utility script to extract and edit the resources in a Windows executable.
+
+EXAMPLE USAGE:
+# Extract from mini_installer.exe, the resource type "B7", langid 1033 and

[grt (UTC plus 2), 2011/12/02 02:38:11]

Either remove references to langid and 1033, or fix ExtractResource to take a
langid.

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Done.

+# name "CHROME.PACKED.7Z" to a file named chrome.7z.
+# Note that 1033 corresponds to English (United States).
+%prog mini_installer.exe --extract B7 1033 CHROME.PACKED.7Z chrome.7z
+
+# Update mini_installer.exe by removing the resouce type "BL", langid 1033 and
+# name "SETUP.EXE". Add the resource type "B7", langid 1033 and name
+# "SETUP.EXE.packed.7z" from the file setup.packed.7z.
+# Write the edited file to mini_installer_packed.exe.
+%prog mini_installer.exe \\
+    --remove BL 1033 SETUP.EXE \\
+    --update B7 1033 SETUP.EXE.packed.7z setup.packed.7z \\
+    --output-file mini_installer_packed.exe
+"""
+
+def _ParseArgs():
+  parser = optparse.OptionParser(_USAGE)
+  parser.add_option('', '--verbose', action='store_true',
+      help='Enable verbose logging.')
+  parser.add_option('', '--extract_all',
+      help='Path to a folder which will be created, in which all resources '
+           'from the input_file will be stored, each in a file named '
+           '"res_type/lang_id/res_name".')
+  parser.add_option('', '--extract', action='append', default=[], nargs=3,
+      help='Extract the resource with the given type and name to the given '
+           'file.',
+      metavar='type name')
+  parser.add_option('', '--remove', action='append', default=[], nargs=3,
+      help='Remove the resource with the given type, langid and name.',
+      metavar='type langid name')
+  parser.add_option('', '--update', action='append', default=[], nargs=4,
+      help='Insert or update the resource with the given type, langid and '
+           'name with the contents of the file given.',
+      metavar='type langid name file_path')
+  parser.add_option('', '--output_file',
+    help='On success, OUTPUT_FILE will written with a copy of the '

[robertshield, 2011/12/02 00:35:42]

will be written

[Sigurður Ásgeirsson, 2011/12/02 13:57:45]

Done.

+         'input file with the edits specified by any remove or update '
+         'options.')
+
+  options, args = parser.parse_args()
+
+  if len(args) != 1:
+    parser.error('You have to specify an input file to work on.')
+
+  modify = options.remove or options.update
+  if modify and not options.output_file:
+    parser.error('You have to specify an output file with edit options.')
+
+  return options, args
+
+
+def main(options, args):
+  """Main program for the script."""
+  if options.verbose:
+    logging.basicConfig(level=logging.INFO)
+
+  # Create the editor for our input file.
+  editor = _ResourceEditor(args[0], options.output_file)
+
+  if options.extract_all:
+    editor.ExtractAllToDir(options.extract_all)
+
+  for res_type, res_name, dest_file in options.extract:
+    editor.ExtractResource(res_type, res_name, dest_file)
+
+  for res_type, res_lang, res_name in options.remove:
+    editor.RemoveResource(res_type, int(res_lang), res_name)
+
+  for res_type, res_lang, res_name, src_file in options.update:
+    editor.UpdateResource(res_type, int(res_lang), res_name, src_file)
+
+  if editor.modified:
+    editor.Commit()
+
+
+if __name__ == '__main__':
+  sys.exit(main(*_ParseArgs()))