1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_ 6#define STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_ 7 8#include "base/basictypes.h" 9#include "base/compiler_specific.h" 10#include "base/files/file.h" 11#include "base/files/file_path.h" 12#include "base/memory/weak_ptr.h" 13#include "base/time/time.h" 14#include "storage/browser/blob/file_stream_reader.h" 15#include "storage/browser/storage_browser_export.h" 16 17namespace base { 18class TaskRunner; 19} 20 21namespace content { 22class LocalFileStreamReaderTest; 23} 24 25namespace net { 26class FileStream; 27} 28 29namespace storage { 30 31// A thin wrapper of net::FileStream with range support for sliced file 32// handling. 33class STORAGE_EXPORT LocalFileStreamReader 34 : public NON_EXPORTED_BASE(FileStreamReader) { 35 public: 36 virtual ~LocalFileStreamReader(); 37 38 // FileStreamReader overrides. 39 virtual int Read(net::IOBuffer* buf, int buf_len, 40 const net::CompletionCallback& callback) OVERRIDE; 41 virtual int64 GetLength( 42 const net::Int64CompletionCallback& callback) OVERRIDE; 43 44 private: 45 friend class FileStreamReader; 46 friend class content::LocalFileStreamReaderTest; 47 48 LocalFileStreamReader(base::TaskRunner* task_runner, 49 const base::FilePath& file_path, 50 int64 initial_offset, 51 const base::Time& expected_modification_time); 52 int Open(const net::CompletionCallback& callback); 53 54 // Callbacks that are chained from Open for Read. 55 void DidVerifyForOpen(const net::CompletionCallback& callback, 56 int64 get_length_result); 57 void DidOpenFileStream(const net::CompletionCallback& callback, 58 int result); 59 void DidSeekFileStream(const net::CompletionCallback& callback, 60 int64 seek_result); 61 void DidOpenForRead(net::IOBuffer* buf, 62 int buf_len, 63 const net::CompletionCallback& callback, 64 int open_result); 65 66 void DidGetFileInfoForGetLength(const net::Int64CompletionCallback& callback, 67 base::File::Error error, 68 const base::File::Info& file_info); 69 70 scoped_refptr<base::TaskRunner> task_runner_; 71 scoped_ptr<net::FileStream> stream_impl_; 72 const base::FilePath file_path_; 73 const int64 initial_offset_; 74 const base::Time expected_modification_time_; 75 bool has_pending_open_; 76 base::WeakPtrFactory<LocalFileStreamReader> weak_factory_; 77}; 78 79} // namespace storage 80 81#endif // STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_ 82