Moving away from shell api to support long path names on windows for filesystem.

base/file_path.h

Index: base/file_path.h
===================================================================
--- base/file_path.h	(revision 69859)
+++ base/file_path.h	(working copy)
@@ -151,6 +151,16 @@
   // The character used to identify a file extension.
   static const CharType kExtensionSeparator;
 
+#if defined(OS_WIN)
+  // Path length is limited to 260 on Windows unless prefixed
+  // with a special extended path prefix. UNC needs a separate
+  // prefix containing "UNC" in it.
+  static const CharType kExtendedPathPrefix[];
+  static const CharType kUNCExtendedPathPrefix[];
+  // '\\' Prefix for network shares.
+  static const CharType kSharePrefix[];
+#endif
+
   FilePath();
   FilePath(const FilePath& that);
   explicit FilePath(const StringType& path);
@@ -307,6 +317,15 @@
   FilePath NormalizeWindowsPathSeparators() const;
 #endif
 
+#if defined(OS_WIN)
+  // This is an interim solution to support long paths on Windows.
+  StringType ToLongFileNameHack(const StringType& path) const;

[kinuko, 2010/12/22 23:20:49]

If it's not called anywhere outside the class, can we move it into anonymous
namespace in .cc file?

[Kavita Kanetkar, 2010/12/23 03:14:28]

Done.

+
+  // Gets the long form if it is in 8.3 file name format. Note that this
+  // is not supported for WinCE.
+  FilePath GetLongPathHack() const;

[kinuko, 2010/12/22 23:20:49]

Can you put a comment that:
- this also prepends the extended path prefix so that the path can become longer
than MAX_PATH char
- the path needs to exist to make this return a correct long path if it has 8.3
short names in it

[Kavita Kanetkar, 2010/12/23 03:14:28]

Done.

+#endif
+
   // Compare two strings in the same way the file system does.
   // Note that these always ignore case, even on file systems that are case-
   // sensitive. If case-sensitive comparison is ever needed, add corresponding