Move a subset of chrome/browser/chromeos/drive into components/drive

chrome/browser/chromeos/drive/local_file_reader.cc

-// Copyright 2013 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 "chrome/browser/chromeos/drive/local_file_reader.h"
-
-#include "base/bind.h"
-#include "base/files/file_path.h"
-#include "base/sequenced_task_runner.h"
-#include "net/base/completion_callback.h"
-#include "net/base/io_buffer.h"
-#include "net/base/net_errors.h"
-
-namespace drive {
-namespace util {
-
-LocalFileReader::LocalFileReader(
-    base::SequencedTaskRunner* sequenced_task_runner)
-    : file_stream_(sequenced_task_runner),
-      weak_ptr_factory_(this) {
-}
-
-LocalFileReader::~LocalFileReader() {
-}
-
-void LocalFileReader::Open(const base::FilePath& file_path,
-                           int64 offset,
-                           const net::CompletionCallback& callback) {
-  DCHECK(!callback.is_null());
-  int flags = base::File::FLAG_OPEN | base::File::FLAG_READ |
-              base::File::FLAG_ASYNC;
-
-  int rv = file_stream_.Open(file_path, flags,
-                             Bind(&LocalFileReader::DidOpen,
-                                  weak_ptr_factory_.GetWeakPtr(),
-                                  callback, offset));
-  DCHECK_EQ(rv, net::ERR_IO_PENDING);
-}
-
-void LocalFileReader::Read(net::IOBuffer* in_buffer,
-                           int buffer_length,
-                           const net::CompletionCallback& callback) {
-  DCHECK(!callback.is_null());
-  DCHECK(file_stream_.IsOpen());
-  int rv = file_stream_.Read(in_buffer, buffer_length, callback);
-  DCHECK_EQ(rv, net::ERR_IO_PENDING);
-}
-
-void LocalFileReader::DidOpen(const net::CompletionCallback& callback,
-                              int64 offset,
-                              int error) {
-  if (error != net::OK)
-    return callback.Run(error);
-
-  int rv = file_stream_.Seek(
-      offset, Bind(&LocalFileReader::DidSeek, weak_ptr_factory_.GetWeakPtr(),
-                   callback, offset));
-  DCHECK_EQ(rv, net::ERR_IO_PENDING);
-}
-
-void LocalFileReader::DidSeek(const net::CompletionCallback& callback,
-                              int64 offset,
-                              int64 error) {
-  callback.Run(error == offset ? net::OK : net::ERR_FAILED);
-}
-
-}  // namespace util
-}  // namespace drive