CrOS: Convert MediaTransferProtocolDaemonClient to use protobufs.

tools/protoc_wrapper/protoc_wrapper.py

+#!/usr/bin/env python
+# 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.
+
+"""A simple wrapper for protoc to add includes in generated cpp headers."""
+
+import optparse
+import subprocess
+import sys
+
+PROTOC_INCLUDE_POINT = '// @@protoc_insertion_point(includes)\n'
+
+def ModifyHeader(header_file, extra_header):
+  """Adds |extra_header| to |header_file|. Returns 0 on success.
+
+  |extra_header| is the name of the header file to include.
+  |header_file| is a generated protobuf cpp header.
+  """
+  include_point_found = False
+  header_contents = []
+  with open(header_file) as f:
+    for line in f:
+      header_contents.append(line)
+      if line == PROTOC_INCLUDE_POINT:
+        extra_header_msg = '#include "%s"\n' % extra_header
+        header_contents.append(extra_header_msg)
+        include_point_found = True;
+  if not include_point_found:
+    return 1
+
+  with open(header_file, 'wb') as f:
+    f.write(''.join(header_contents))
+  return 0
+
+
+def main(argv):
+  parser = optparse.OptionParser()
+  parser.add_option('--include', dest='extra_header',
+                    help='The extra header to include. This must be specified '
+                         'along with --protobuf.')
+  parser.add_option('--protobuf', dest='generated_header',
+                    help='The c++ protobuf header to add the extra header to. '
+                         'This must be specified along with --include.')
+  (options, args) = parser.parse_args(sys.argv)
+  if len(args) < 2:
+    return 1
+
+  # Run what is hopefully protoc.
+  ret = subprocess.call(args[1:])
+  if ret != 0:
+    return ret
+
+  # protoc succeeded, check to see if the generated cpp header needs editing.
+  if not options.extra_header or not options.generated_header:
+    return 0
+  return ModifyHeader(options.generated_header, options.extra_header)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))