Improved compatibility of generate_xml_from_google_services_json.py

Explicitly imported ctypes.wintypes so that pyinstaller will include the
module correctly when building the executable and updated the script to work
with Python 3's ctypes module and Python 3 strings.

This still requires installation of the Universal C Runtime for Windows 7/8
installs.

PiperOrigin-RevId: 289697692

Author: smiles

generate_xml_from_google_services_json.exe

@@ -30,6 +30,15 @@
 import sys
 from xml.etree import ElementTree
 
+if platform.system().lower() == 'windows':
+  import ctypes.wintypes  # pylint: disable=g-import-not-at-top
+
+# Map Python 2's unicode method to encode a string as bytes in python 3.
+try:
+  unicode('')  # See whether unicode class is available (Python < 3)
+except NameError:
+  unicode = str  # pylint: disable=redefined-builtin,invalid-name
+
 # Input filename if it isn't set.
 DEFAULT_INPUT_FILENAME = 'app/google-services.json'
 # Output filename if it isn't set.
@@ -231,12 +240,12 @@ def argv_as_unicode_win32():
   command_line_to_argv_w = ctypes.windll.shell32.CommandLineToArgvW
   command_line_to_argv_w.argtypes = [
       ctypes.wintypes.LPCWSTR,
-      ctypes.wintypes.POINTER(ctypes.wintypes.c_int)
+      ctypes.POINTER(ctypes.c_int)
   ]
-  command_line_to_argv_w.restype = ctypes.wintypes.POINTER(
+  command_line_to_argv_w.restype = ctypes.POINTER(
       ctypes.wintypes.LPWSTR)
 
-  argc = ctypes.wintypes.c_int(0)
+  argc = ctypes.c_int(0)
   argv = command_line_to_argv_w(get_command_line_w(), argc)
 
   # Strip the python executable from the arguments if it exists
@@ -298,18 +307,18 @@ def main():
     output_filename = DEFAULT_OUTPUT_FILENAME
 
   if args.i:
-    input_filename_raw = args.i
     # Encode the input string (type unicode) as a normal string (type str)
     # using the 'utf-8' encoding so that it can be worked with the same as
     # input names from other sources (like the defaults).
-    input_filename = input_filename_raw.encode('utf-8')
+    input_filename_raw = args.i.encode('utf-8')
+    # Decode the filename to a unicode string using the 'utf-8' encoding to
+    # properly handle filepaths with unicode characters in them.
+    input_filename = input_filename_raw.decode('utf-8')
 
   if args.o:
     output_filename = args.o
 
-  # Decode the filename to a unicode string using the 'utf-8' encoding to
-  # properly handle filepaths with unicode characters in them.
-  with open(input_filename.decode('utf-8'), 'r') as ifile:
+  with open(input_filename, 'r') as ifile:
     file_string = ifile.read()
 
   json_string = None