Computes the total size of the files in a directory...

base/file_util.h

 // Copyright (c) 2010 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
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 // created on or after the given |file_time|.  Doesn't count ".." or ".".
 //
 // Note for POSIX environments: a file created before |file_time|
 // can be mis-detected as a newer file due to low precision of
 // timestmap of file creation time. If you need to avoid such
 // mis-detection perfectly, you should wait one second before
 // obtaining |file_time|.
 int CountFilesCreatedAfter(const FilePath& path,
                            const base::Time& file_time);
 
+// Returns the total number of bytes used by all the files under |root_path|.
+// If the path does not exist the function returns 0.
+//
+// This function is implemented using the FileEnumerator class so it is not
+// particularly speedy in any platform.
+int64 ComputeDirectorySize(const FilePath& root_path);
+
 // Deletes the given path, whether it's a file or a directory.
 // If it's a directory, it's perfectly happy to delete all of the
 // directory's contents.  Passing true to recursive deletes
 // subdirectories and their contents as well.
 // Returns true if successful, false otherwise.
 //
 // WARNING: USING THIS WITH recursive==true IS EQUIVALENT
 //          TO "rm -rf", SO USE WITH CAUTION.
 bool Delete(const FilePath& path, bool recursive);
 
@@ skipping 411 matching lines @@
 bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
                               const base::Time& cutoff_time);
 
 }  // namespace file_util
 
 // Deprecated functions have been moved to this separate header file,
 // which must be included last after all the above definitions.
 #include "base/file_util_deprecated.h"
 
 #endif  // BASE_FILE_UTIL_H_