Rename webkit_blob::FileReader to FileStreamReader.

webkit/blob/local_file_reader.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 WEBKIT_BLOB_LOCAL_FILE_READER_H_
-#define WEBKIT_BLOB_LOCAL_FILE_READER_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/file_path.h"
-#include "base/platform_file.h"
-#include "base/memory/weak_ptr.h"
-#include "base/time.h"
-#include "webkit/blob/blob_export.h"
-#include "webkit/blob/file_reader.h"
-
-namespace base {
-class TaskRunner;
-}
-
-namespace webkit_blob {
-
-// A thin wrapper of net::FileStream with range support for sliced file
-// handling.
-class BLOB_EXPORT LocalFileReader : public FileReader {
- public:
-  // A convenient method to translate platform file error to net error code.
-  static int PlatformFileErrorToNetError(base::PlatformFileError file_error);
-
-  // Creates a new FileReader for a local file |file_path|.
-  // |initial_offset| specifies the offset in the file where the first read
-  // should start.  If the given offset is out of the file range any
-  // read operation may error out with net::ERR_REQUEST_RANGE_NOT_SATISFIABLE.
-  //
-  // |expected_modification_time| specifies the expected last modification
-  // If the value is non-null, the reader will check the underlying file's
-  // actual modification time to see if the file has been modified, and if
-  // it does any succeeding read operations should fail with
-  // ERR_UPLOAD_FILE_CHANGED error.
-  LocalFileReader(base::TaskRunner* task_runner,
-                  const FilePath& file_path,
-                  int64 initial_offset,
-                  const base::Time& expected_modification_time);
-  virtual ~LocalFileReader();
-
-  // FileReader overrides.
-  virtual int Read(net::IOBuffer* buf, int buf_len,
-                   const net::CompletionCallback& callback) OVERRIDE;
-
-  // Returns the length of the file if it could successfully retrieve the
-  // file info *and* its last modification time equals to
-  // expected_modification_time_ (rv >= 0 cases).
-  // Otherwise, a negative error code is returned (rv < 0 cases).
-  // If the stream is deleted while it has an in-flight GetLength operation
-  // |callback| will not be called.
-  int GetLength(const net::Int64CompletionCallback& callback);
-
- private:
-  int Open(const net::CompletionCallback& callback);
-
-  // Callbacks that are chained from Open for Read.
-  void DidVerifyForOpen(const net::CompletionCallback& callback,
-                        int64 get_length_result);
-  void DidOpenFileStream(const net::CompletionCallback& callback,
-                         int result);
-  void DidSeekFileStream(const net::CompletionCallback& callback,
-                         int64 seek_result);
-  void DidOpenForRead(net::IOBuffer* buf,
-                      int buf_len,
-                      const net::CompletionCallback& callback,
-                      int open_result);
-
-  void DidGetFileInfoForGetLength(const net::Int64CompletionCallback& callback,
-                                  base::PlatformFileError error,
-                                  const base::PlatformFileInfo& file_info);
-
-  scoped_refptr<base::TaskRunner> task_runner_;
-  scoped_ptr<net::FileStream> stream_impl_;
-  const FilePath file_path_;
-  const int64 initial_offset_;
-  const base::Time expected_modification_time_;
-  bool has_pending_open_;
-  base::WeakPtrFactory<LocalFileReader> weak_factory_;
-};
-
-}  // namespace webkit_blob
-
-#endif  // WEBKIT_BLOB_LOCAL_FILE_READER_H_