Add FileSystemMountPointProvider::CreateFileReader() which returns appropriate Reader instance

webkit/fileapi/isolated_mount_point_provider.cc

 // Copyright (c) 2012 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.
 
 #include "webkit/fileapi/isolated_mount_point_provider.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "googleurl/src/gurl.h"
+#include "webkit/blob/local_file_reader.h"
 #include "webkit/fileapi/file_system_callback_dispatcher.h"
+#include "webkit/fileapi/file_system_file_reader.h"
 #include "webkit/fileapi/file_system_operation.h"
 #include "webkit/fileapi/file_system_types.h"
+#include "webkit/fileapi/file_system_util.h"
 #include "webkit/fileapi/isolated_context.h"
 #include "webkit/fileapi/isolated_file_util.h"
 #include "webkit/fileapi/native_file_util.h"
 
 namespace fileapi {
 
 IsolatedMountPointProvider::IsolatedMountPointProvider()
   : isolated_file_util_(new IsolatedFileUtil(new NativeFileUtil())) {
 }
 
@@ skipping 63 matching lines @@
 FileSystemOperationInterface*
 IsolatedMountPointProvider::CreateFileSystemOperation(
     const GURL& origin_url,
     FileSystemType file_system_type,
     const FilePath& virtual_path,
     base::MessageLoopProxy* file_proxy,
     FileSystemContext* context) const {
   return new FileSystemOperation(file_proxy, context);
 }
 
+webkit_blob::FileReader* IsolatedMountPointProvider::CreateFileReader(
+    const GURL& url,
+    int64 offset,
+    base::MessageLoopProxy* file_proxy,
+    FileSystemContext* context) const {
+  GURL origin_url;
+  FileSystemType file_system_type = kFileSystemTypeUnknown;
+  FilePath virtual_path;
+  if (!CrackFileSystemURL(url, &origin_url, &file_system_type, &virtual_path))
+    return NULL;
+  std::string fsid;
+  FilePath path;
+  if (!isolated_context()->CrackIsolatedPath(virtual_path, &fsid, NULL, &path))
+    return NULL;
+  if (path.empty())
+    return NULL;
+  return new webkit_blob::LocalFileReader(
+      file_proxy, path, offset, base::Time());
+}
+
 IsolatedContext* IsolatedMountPointProvider::isolated_context() const {
   return IsolatedContext::GetInstance();
 }
 
 }  // namespace fileapi