Roll forward 8722,8721

base/file_util.h

 // 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_POSIX)
 #include <fts.h>
 #include <sys/stat.h>
 #endif
 
 #include <stdio.h>
 
 #include <stack>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/scoped_ptr.h"
 #include "base/file_path.h"
 
 namespace file_util {
 
 //-----------------------------------------------------------------------------
 // Functions that operate purely on a path string w/o touching the filesystem:
 
 // Returns a vector of all of the components of the provided path.
 void PathComponents(const FilePath& path,
                     std::vector<FilePath::StringType>* components);
@@ skipping 274 matching lines @@
 
 // Wrapper for fopen-like calls. Returns non-NULL FILE* on success.
 FILE* OpenFile(const FilePath& filename, const char* mode);
 // Deprecated temporary compatibility functions.
 FILE* OpenFile(const std::string& filename, const char* mode);
 FILE* OpenFile(const std::wstring& filename, const char* mode);
 
 // Closes file opened by OpenFile. Returns true on success.
 bool CloseFile(FILE* file);
 
+// Truncates an open file to end at the location of the current file pointer.
+// This is a cross-platform analog to Windows' SetEndOfFile() function.
+bool TruncateFile(FILE* file);
+
 // Reads the given number of bytes from the file into the buffer.  Returns
 // the number of read bytes, or -1 on error.
 int ReadFile(const std::wstring& filename, char* data, int size);
 
 // Writes the given buffer into the file, overwriting any data that was
 // previously there.  Returns the number of bytes written, or -1 on error.
 int WriteFile(const std::wstring& filename, const char* data, int size);
 
 // Gets the current working directory for the process.
 bool GetCurrentDirectory(FilePath* path);
 // Deprecated temporary compatibility function.
 bool GetCurrentDirectory(std::wstring* path);
 
 // Sets the current working directory for the process.
 bool SetCurrentDirectory(const FilePath& path);
 // Deprecated temporary compatibility function.
 bool SetCurrentDirectory(const std::wstring& current_directory);
 
+// A class to handle auto-closing of FILE*'s.
+class ScopedFILEClose {
+ public:
+  inline void operator()(FILE* x) const {
+    if (x) {
+      fclose(x);
+    }
+  }
+};
+
+typedef scoped_ptr_malloc<FILE, ScopedFILEClose> ScopedFILE;
+
 // A class for enumerating the files in a provided path. The order of the
 // results is not guaranteed.
 //
 // DO NOT USE FROM THE MAIN THREAD of your application unless it is a test
 // program where latency does not matter. This class is blocking.
 class FileEnumerator {
  public:
 #if defined(OS_WIN)
   typedef WIN32_FIND_DATA FindInfo;
 #elif defined(OS_POSIX)
@@ skipping 111 matching lines @@
 
 // Renames a file using the SHFileOperation API to ensure that the target file
 // gets the correct default security descriptor in the new path.
 bool RenameFileAndResetSecurityDescriptor(
     const FilePath& source_file_path,
     const FilePath& target_file_path);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_