Convert download manager to FilePath.

base/file_util.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/file_util.h"
 
 #include <stdio.h>
 
 #include <fstream>
 
@@ skipping 61 matching lines @@
   path_str.append(&FilePath::kSeparators[0], 1);
 
   return true;
 }
 
 void TrimTrailingSeparator(std::wstring* dir) {
   while (dir->length() > 1 && EndsWithSeparator(dir))
     dir->resize(dir->length() - 1);
 }
 
-std::wstring GetFileExtensionFromPath(const std::wstring& path) {
-  std::wstring file_name = GetFilenameFromPath(path);
-  std::wstring::size_type last_dot = file_name.rfind(L'.');
-  return std::wstring(last_dot == std::wstring::npos ? 
-      L"" : 
-      file_name, last_dot+1);
+FilePath::StringType GetFileExtensionFromPath(const FilePath& path) {
+  FilePath::StringType file_name = path.BaseName().value();
+  const FilePath::StringType::size_type last_dot =
+      file_name.rfind(kExtensionSeparator);
+  return FilePath::StringType(last_dot == FilePath::StringType::npos ?
+                              FILE_PATH_LITERAL("") :
+                              file_name, last_dot+1);
 }
 
 std::wstring GetFilenameWithoutExtensionFromPath(const std::wstring& path) {
   std::wstring file_name = GetFilenameFromPath(path);
   std::wstring::size_type last_dot = file_name.rfind(L'.');
   return file_name.substr(0, last_dot);
 }
 
 void InsertBeforeExtension(FilePath* path, const FilePath::StringType& suffix) {
   FilePath::StringType& value =
@@ skipping 269 matching lines @@
 bool EndsWithSeparator(const std::wstring& path) {
   return EndsWithSeparator(FilePath::FromWStringHack(path));
 }
 bool GetCurrentDirectory(std::wstring* path_str) {
   FilePath path;
   if (!GetCurrentDirectory(&path))
     return false;
   *path_str = path.ToWStringHack();
   return true;
 }
+std::wstring GetFileExtensionFromPath(const std::wstring& path) {
+  FilePath::StringType extension =
+      GetFileExtensionFromPath(FilePath::FromWStringHack(path));
+#if defined(OS_WIN)
+  return extension;
+#elif defined(OS_POSIX)
+  return UTF8ToWide(extension);
+#endif
+}
 bool GetFileInfo(const std::wstring& file_path, FileInfo* results) {
   return GetFileInfo(FilePath::FromWStringHack(file_path), results);
 }
 std::wstring GetFilenameFromPath(const std::wstring& path) {
   if (path.empty() || EndsWithSeparator(path))
     return std::wstring();
 
   return FilePath::FromWStringHack(path).BaseName().ToWStringHack();
 }
 bool GetFileSize(const std::wstring& file_path, int64* file_size) {
@@ skipping 42 matching lines @@
   FilePath directory = path.DirName();
   // If there is no separator, we will get back kCurrentDirectory.
   // In this case, clear dir.
   if (directory == path || directory.value() == FilePath::kCurrentDirectory)
     dir->clear();
   else
     *dir = directory.ToWStringHack();
 }
 }  // namespace