FileUtilsTest DirExists function added

webrtc/test/testsupport/fileutils.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 88 matching lines @@
   temp_path = temp_path.substr(0, temp_path.find_last_of(kPathDelimiter));
   strncpy(relative_dir_path, temp_path.c_str(), FILENAME_MAX);
   relative_dir_path_set = true;
 }
 
 bool FileExists(const std::string& file_name) {
   struct stat file_info = {0};
   return stat(file_name.c_str(), &file_info) == 0;
 }
 
+bool DirExists(const std::string& directory_name) {
+  struct stat directory_info = {0};
+  return stat(directory_name.c_str(), &directory_info) == 0 && S_ISDIR(
+      directory_info.st_mode);
+}
+
 #ifdef WEBRTC_ANDROID
 
 std::string ProjectRootPath() {
   return kRootDirName;
 }
 
 std::string OutputPath() {
   return kRootDirName;
 }
 
@@ skipping 159 matching lines @@
     if (fseek(f, 0, SEEK_END) == 0) {
       size = ftell(f);
     }
     fclose(f);
   }
   return size;
 }
 
 }  // namespace test
 }  // namespace webrtc