Enable cross-filesystem moves and copies.

webkit/fileapi/file_system_file_util.h

 // Copyright (c) 2011 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.
 
 #ifndef WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
 
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 98 matching lines @@
       bool exclusive,
       bool recursive);
 
   // Copies or moves a single file.
   virtual PlatformFileError CopyOrMoveFile(
       FileSystemOperationContext* context,
       const FilePath& src_file_path,
       const FilePath& dest_file_path,
       bool copy);
 
+  // Copies in a single file from a different filesystem.  The src_file_path is
+  // a true local platform path, regardless of which subclass of
+  // FileSystemFileUtil is being invoked.
+  virtual PlatformFileError CopyInForeignFile(
+        FileSystemOperationContext* context,
+        const FilePath& src_file_path,
+        const FilePath& dest_file_path);
+
   // Copies a file or a directory from |src_file_path| to |dest_file_path|.
   //
   // Error cases:
   // If destination's parent doesn't exist.
   // If source dir exists but destination path is an existing file.
   // If source file exists but destination path is an existing directory.
   // If source is a parent of destination.
   // If source doesn't exist.
   //
   // This method calls one of the following methods depending on whether the
@@ skipping 118 matching lines @@
   // Performs recursive copy or move by calling CopyOrMoveFile for individual
   // files. Operations for recursive traversal are encapsulated in this method.
   // It assumes src_file_path and dest_file_path have passed
   // PerformCommonCheckAndPreparationForMoveAndCopy().
   PlatformFileError CopyOrMoveDirectory(
       FileSystemOperationContext* context,
       const FilePath& src_file_path,
       const FilePath& dest_file_path,
       bool copy);
 
+  // Determines whether a simple same-filesystem move or copy can be done.  If
+  // so, it delegates to CopyOrMoveFile.  Otherwise it looks up the true
+  // platform path of the source file, delegates to CopyInForeignFile, and [for
+  // move] calls DeleteFile on the source file.
+  PlatformFileError CopyOrMoveFileHelper(
+      FileSystemOperationContext* context,
+      const FilePath& src_file_path,
+      const FilePath& dest_file_path,
+      bool copy);
+
   // Returns a pointer to a new instance of AbstractFileEnumerator which is
   // implemented for each FileUtil subclass. The instance needs to be freed
   // by the caller, and its lifetime should not extend past when the current
   // call returns to the main FILE message loop.
   virtual AbstractFileEnumerator* CreateFileEnumerator(
       FileSystemOperationContext* unused,
       const FilePath& root_path);
 
   friend struct DefaultSingletonTraits<FileSystemFileUtil>;
   DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_