* switch download manager to using FilePath

* add empty() function to FilePath
* implement file_util::GetFileExtensionFromPath

Review URL: http://codereview.chromium.org/17032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@7564 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 16 insertions, 6 deletions

diff --git a/base/file_util.cc b/base/file_util.cc
index fe33c32..e4c3ae7 100644
--- a/base/file_util.cc
+++ b/base/file_util.cc
@@ -79,12 +79,13 @@ void TrimTrailingSeparator(std::wstring* 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) {
@@ -374,6 +375,15 @@ bool GetCurrentDirectory(std::wstring* path_str) {
   *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);
 }