Roll forward 8722,8721

Review URL: http://codereview.chromium.org/19028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8734 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 17 insertions, 0 deletions

diff --git a/base/file_util.h b/base/file_util.h
index 4154856..c546b9a 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -24,6 +24,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/scoped_ptr.h"
 #include "base/file_path.h"
 
 namespace file_util {
@@ -318,6 +319,10 @@ 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);
@@ -336,6 +341,18 @@ 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.
 //