components/storage_monitor/media_storage_util.h

   1 // Copyright 2014 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 // MediaStorageUtil provides information about storage devices attached
   6 // to the computer.
   7
   8 #ifndef COMPONENTS_STORAGE_MONITOR_MEDIA_STORAGE_UTIL_H_
   9 #define COMPONENTS_STORAGE_MONITOR_MEDIA_STORAGE_UTIL_H_
  10
  11 #include <set>
  12 #include <string>
  13
  14 #include "base/basictypes.h"
  15 #include "base/callback_forward.h"
  16 #include "base/files/file_path.h"
  17
  18 namespace storage_monitor {
  19
  20 class StorageInfo;
  21
  22 class MediaStorageUtil {
  23  public:
  24   typedef std::set<std::string /*device id*/> DeviceIdSet;
  25
  26   // Check if the file system at the passed mount point looks like a media
  27   // device using the existence of DCIM directory.
  28   // Returns true if it looks like a media device, otherwise returns false.
  29   // Mac OS X behaves similarly, but this is not the only heuristic it uses.
  30   // TODO(vandebo) Try to figure out how Mac OS X decides this, and rename
  31   // if additional OS X heuristic is implemented.
  32   static bool HasDcim(const base::FilePath& mount_point);
  33
  34   // Returns true if we will be able to create a filesystem for this device.
  35   static bool CanCreateFileSystem(const std::string& device_id,
  36                                   const base::FilePath& path);
  37
  38   // Removes disconnected devices from |devices| and then calls |done|.
  39   static void FilterAttachedDevices(DeviceIdSet* devices,
  40                                     const base::Closure& done);
  41
  42   // Given |path|, fill in |device_info|, and |relative_path|
  43   // (from the root of the device).
  44   static bool GetDeviceInfoFromPath(const base::FilePath& path,
  45                                     StorageInfo* device_info,
  46                                     base::FilePath* relative_path);
  47
  48   // Get a base::FilePath for the given |device_id|.  If the device isn't a mass
  49   // storage type, the base::FilePath will be empty.  This does not check that
  50   // the device is connected.
  51   static base::FilePath FindDevicePathById(const std::string& device_id);
  52
  53   // Record device information histogram for the given |device_uuid| and
  54   // |device_label|. |mass_storage| indicates whether the current device is a
  55   // mass storage device, as defined by IsMassStorageDevice().
  56   static void RecordDeviceInfoHistogram(bool mass_storage,
  57                                         const std::string& device_uuid,
  58                                         const base::string16& device_label);
  59
  60   // Returns true if the |id| is both a removable device and also
  61   // currently attached.
  62   static bool IsRemovableStorageAttached(const std::string& id);
  63
  64  private:
  65   DISALLOW_IMPLICIT_CONSTRUCTORS(MediaStorageUtil);
  66 };
  67
  68 }  // namespace storage_monitor
  69
  70 #endif  // COMPONENTS_STORAGE_MONITOR_MEDIA_STORAGE_UTIL_H_