chrome/browser/chromeos/drive/local_file_reader.cc

   1 // Copyright 2013 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 #include "chrome/browser/chromeos/drive/local_file_reader.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_path.h"
   9 #include "base/profiler/scoped_tracker.h"
  10 #include "base/sequenced_task_runner.h"
  11 #include "net/base/completion_callback.h"
  12 #include "net/base/io_buffer.h"
  13 #include "net/base/net_errors.h"
  14
  15 namespace drive {
  16 namespace util {
  17
  18 LocalFileReader::LocalFileReader(
  19     base::SequencedTaskRunner* sequenced_task_runner)
  20     : file_stream_(sequenced_task_runner),
  21       weak_ptr_factory_(this) {
  22 }
  23
  24 LocalFileReader::~LocalFileReader() {
  25 }
  26
  27 void LocalFileReader::Open(const base::FilePath& file_path,
  28                            int64 offset,
  29                            const net::CompletionCallback& callback) {
  30   DCHECK(!callback.is_null());
  31   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ |
  32               base::File::FLAG_ASYNC;
  33
  34   int rv = file_stream_.Open(file_path, flags,
  35                              Bind(&LocalFileReader::DidOpen,
  36                                   weak_ptr_factory_.GetWeakPtr(),
  37                                   callback, offset));
  38   DCHECK_EQ(rv, net::ERR_IO_PENDING);
  39 }
  40
  41 void LocalFileReader::Read(net::IOBuffer* in_buffer,
  42                            int buffer_length,
  43                            const net::CompletionCallback& callback) {
  44   DCHECK(!callback.is_null());
  45   DCHECK(file_stream_.IsOpen());
  46   int rv = file_stream_.Read(in_buffer, buffer_length, callback);
  47   DCHECK_EQ(rv, net::ERR_IO_PENDING);
  48 }
  49
  50 void LocalFileReader::DidOpen(const net::CompletionCallback& callback,
  51                               int64 offset,
  52                               int error) {
  53   // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
  54   tracked_objects::ScopedTracker tracking_profile(
  55       FROM_HERE_WITH_EXPLICIT_FUNCTION("423948 LocalFileReader::DidOpen"));
  56
  57   if (error != net::OK)
  58     return callback.Run(error);
  59
  60   int rv = file_stream_.Seek(base::File::FROM_BEGIN, offset,
  61                              Bind(&LocalFileReader::DidSeek,
  62                                   weak_ptr_factory_.GetWeakPtr(),
  63                                   callback, offset));
  64   DCHECK_EQ(rv, net::ERR_IO_PENDING);
  65 }
  66
  67 void LocalFileReader::DidSeek(const net::CompletionCallback& callback,
  68                               int64 offset,
  69                               int64 error) {
  70   callback.Run(error == offset ? net::OK : net::ERR_FAILED);
  71 }
  72
  73 }  // namespace util
  74 }  // namespace drive