MTP Streaming: Optimize block reading

chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
 
 #include <queue>
 
 #include "base/callback.h"
@@ skipping 118 matching lines @@
   // Called when GetFileInfo() succeeds. GetFileInfo() is invoked to
   // create the snapshot file of |snapshot_request_info.device_file_path|.
   // |file_info| specifies the device file metadata details.
   //
   // Posts a task on the UI thread to copy the data contents of the device file
   // to the snapshot file.
   void OnDidGetFileInfoToCreateSnapshotFile(
       scoped_ptr<SnapshotRequestInfo> snapshot_request_info,
       const base::File::Info& file_info);
 
-  // Called when GetFileInfo() succeeds to read a range of bytes.
-  void OnDidGetFileInfoToReadBytes(const ReadBytesRequest& request,
-                                   const base::File::Info& file_info);
-
   // Called when ReadDirectory() succeeds.
   //
   // |file_list| contains the directory file entries.
   // |success_callback| is invoked to notify the caller about the directory
   // file entries.
   void OnDidReadDirectory(const ReadDirectorySuccessCallback& success_callback,
                           const fileapi::AsyncFileUtil::EntryList& file_list);
 
   // Called when WriteDataIntoSnapshotFile() succeeds.
   //
@@ skipping 11 matching lines @@
   //
   // |current_snapshot_request_info_.error_callback| is invoked to notify the
   // caller about |error|.
   void OnWriteDataIntoSnapshotFileError(base::File::Error error);
 
   // Called when ReadBytes() succeeds.
   //
   // |success_callback| is invoked to notify the caller about the read bytes.
   // |bytes_read| is the number of bytes read.
   void OnDidReadBytes(const ReadBytesSuccessCallback& success_callback,
-                      int bytes_read);
+                      const base::File::Info& file_info, int bytes_read);
 
   // Handles the device file |error|. |error_callback| is invoked to notify the
   // caller about the file error.
   void HandleDeviceFileError(const ErrorCallback& error_callback,
                              base::File::Error error);
 
   // MTP device initialization state.
   InitializationState init_state_;
 
   // Used to make sure only one task is in progress at any time.
@@ skipping 17 matching lines @@
   // request at any time.
   scoped_ptr<SnapshotRequestInfo> current_snapshot_request_info_;
 
   // For callbacks that may run after destruction.
   base::WeakPtrFactory<MTPDeviceDelegateImplLinux> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MTPDeviceDelegateImplLinux);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_