Media Gallery: Move MediaDeviceNotificationsLinux from content to chrome.

content/browser/media_device_notifications_linux.cc

Index: content/browser/media_device_notifications_linux.cc
===================================================================
--- content/browser/media_device_notifications_linux.cc	(revision 132051)
+++ content/browser/media_device_notifications_linux.cc	(working copy)
@@ -1,278 +0,0 @@
-// 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.
-
-// MediaDeviceNotificationsLinux implementation.
-
-#include "content/browser/media_device_notifications_linux.h"
-
-#include <mntent.h>
-#include <stdio.h>
-
-#include <vector>
-
-#include "base/bind.h"
-#include "base/file_path.h"
-#include "base/file_util.h"
-#include "base/string_util.h"
-#include "base/system_monitor/system_monitor.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace {
-
-const char kDCIMDirName[] = "DCIM";
-
-// List of file systems we care about.
-const char* const kKnownFileSystems[] = {
-  "ext2",
-  "ext3",
-  "ext4",
-  "fat",
-  "hfsplus",
-  "iso9660",
-  "msdos",
-  "ntfs",
-  "udf",
-  "vfat",
-};
-
-}  // namespace
-
-namespace content {
-
-using base::SystemMonitor;
-
-// A simple pass-through class. MediaDeviceNotificationsLinux cannot directly
-// inherit from FilePathWatcher::Delegate due to multiple inheritance.
-class MediaDeviceNotificationsLinux::WatcherDelegate
-    : public base::files::FilePathWatcher::Delegate {
- public:
-  explicit WatcherDelegate(MediaDeviceNotificationsLinux* notifier);
-
-  // base::files::FilePathWatcher::Delegate implementation.
-  virtual void OnFilePathChanged(const FilePath& path) OVERRIDE;
-
- private:
-  friend class base::RefCountedThreadSafe<WatcherDelegate>;
-
-  // Avoids code deleting the object while there are references to it.
-  // Aside from the base::RefCountedThreadSafe friend class, any attempts to
-  // call this dtor will result in a compile-time error.
-  virtual ~WatcherDelegate();
-
-  // The MediaDeviceNotificationsLinux instance that owns this WatcherDelegate.
-  // Since |notifier_| will destroy this WatcherDelegate before it goes away,
-  // the pointer is always valid. No need to add a reference count, as that
-  // would create a circular reference.
-  MediaDeviceNotificationsLinux* const notifier_;
-
-  DISALLOW_COPY_AND_ASSIGN(WatcherDelegate);
-};
-
-MediaDeviceNotificationsLinux::WatcherDelegate::WatcherDelegate(
-    MediaDeviceNotificationsLinux* notifier)
-    : notifier_(notifier) {
-}
-
-MediaDeviceNotificationsLinux::WatcherDelegate::~WatcherDelegate() {
-}
-
-void MediaDeviceNotificationsLinux::WatcherDelegate::OnFilePathChanged(
-    const FilePath& path) {
-  notifier_->OnFilePathChanged(path);
-}
-
-MediaDeviceNotificationsLinux::MediaDeviceNotificationsLinux(
-    const FilePath& path)
-    : initialized_(false),
-      mtab_path_(path),
-      current_device_id_(0U) {
-  CHECK(!path.empty());
-
-  // Put |kKnownFileSystems| in std::set to get O(log N) access time.
-  for (size_t i = 0; i < arraysize(kKnownFileSystems); ++i) {
-    known_file_systems_.insert(kKnownFileSystems[i]);
-  }
-}
-
-MediaDeviceNotificationsLinux::~MediaDeviceNotificationsLinux() {
-}
-
-void MediaDeviceNotificationsLinux::Init() {
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE,
-      base::Bind(&MediaDeviceNotificationsLinux::InitOnFileThread, this));
-}
-
-void MediaDeviceNotificationsLinux::OnFilePathChanged(const FilePath& path) {
-  if (path != mtab_path_) {
-    // This cannot happen unless FileWatcher is buggy. Just ignore this
-    // notification and do nothing.
-    NOTREACHED();
-    return;
-  }
-
-  UpdateMtab();
-}
-
-void MediaDeviceNotificationsLinux::InitOnFileThread() {
-  DCHECK(!initialized_);
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  initialized_ = true;
-
-  watcher_delegate_ = new WatcherDelegate(this);
-  if (!file_watcher_.Watch(mtab_path_, watcher_delegate_)) {
-    LOG(ERROR) << "Adding watch for " << mtab_path_.value() << " failed";
-    return;
-  }
-
-  UpdateMtab();
-}
-
-void MediaDeviceNotificationsLinux::UpdateMtab() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-
-  MountMap new_mtab;
-  ReadMtab(&new_mtab);
-
-  // Check existing mtab entries for unaccounted mount points.
-  // These mount points must have been removed in the new mtab.
-  std::vector<std::string> mount_points_to_erase;
-  for (MountMap::const_iterator it = mtab_.begin(); it != mtab_.end(); ++it) {
-    const std::string& mount_point = it->first;
-    // |mount_point| not in |new_mtab|.
-    if (new_mtab.find(mount_point) == new_mtab.end()) {
-      const SystemMonitor::DeviceIdType& device_id = it->second.second;
-      RemoveOldDevice(device_id);
-      mount_points_to_erase.push_back(mount_point);
-    }
-  }
-  // Erase the |mtab_| entries afterwards. Erasing in the loop above using the
-  // iterator is slightly more efficient, but more tricky, since calling
-  // std::map::erase() on an iterator invalidates it.
-  for (size_t i = 0; i < mount_points_to_erase.size(); ++i)
-    mtab_.erase(mount_points_to_erase[i]);
-
-  // Check new mtab entries against existing ones.
-  for (MountMap::iterator newiter = new_mtab.begin();
-       newiter != new_mtab.end();
-       ++newiter) {
-    const std::string& mount_point = newiter->first;
-    const MountDeviceAndId& mount_device_and_id = newiter->second;
-    const std::string& mount_device = mount_device_and_id.first;
-    SystemMonitor::DeviceIdType& id = newiter->second.second;
-    MountMap::iterator olditer = mtab_.find(mount_point);
-    // Check to see if it is a new mount point.
-    if (olditer == mtab_.end()) {
-      if (IsMediaDevice(mount_point)) {
-        AddNewDevice(mount_device, mount_point, &id);
-        mtab_.insert(std::make_pair(mount_point, mount_device_and_id));
-      }
-      continue;
-    }
-
-    // Existing mount point. Check to see if a new device is mounted there.
-    const MountDeviceAndId& old_mount_device_and_id = olditer->second;
-    if (mount_device == old_mount_device_and_id.first)
-      continue;
-
-    // New device mounted.
-    RemoveOldDevice(old_mount_device_and_id.second);
-    if (IsMediaDevice(mount_point)) {
-      AddNewDevice(mount_device, mount_point, &id);
-      olditer->second = mount_device_and_id;
-    }
-  }
-}
-
-void MediaDeviceNotificationsLinux::ReadMtab(MountMap* mtab) {
-  FILE* fp = setmntent(mtab_path_.value().c_str(), "r");
-  if (!fp)
-    return;
-
-  MountMap& new_mtab = *mtab;
-  mntent entry;
-  char buf[512];
-  SystemMonitor::DeviceIdType mount_position = 0;
-  typedef std::pair<std::string, SystemMonitor::DeviceIdType> MountPointAndId;
-  typedef std::map<std::string, MountPointAndId> DeviceMap;
-  DeviceMap device_map;
-  while (getmntent_r(fp, &entry, buf, sizeof(buf))) {
-    // We only care about real file systems.
-    if (known_file_systems_.find(entry.mnt_type) == known_file_systems_.end())
-      continue;
-    // Add entries, but overwrite entries for the same mount device. Keep track
-    // of the entry positions in the device id field and use that below to
-    // resolve multiple devices mounted at the same mount point.
-    MountPointAndId mount_point_and_id =
-        std::make_pair(entry.mnt_dir, mount_position++);
-    DeviceMap::iterator it = device_map.find(entry.mnt_fsname);
-    if (it == device_map.end()) {
-      device_map.insert(it,
-                        std::make_pair(entry.mnt_fsname, mount_point_and_id));
-    } else {
-      it->second = mount_point_and_id;
-    }
-  }
-  endmntent(fp);
-
-  for (DeviceMap::const_iterator device_it = device_map.begin();
-       device_it != device_map.end();
-       ++device_it) {
-    const std::string& device = device_it->first;
-    const std::string& mount_point = device_it->second.first;
-    const SystemMonitor::DeviceIdType& position = device_it->second.second;
-
-    // No device at |mount_point|, save |device| to it.
-    MountMap::iterator mount_it = new_mtab.find(mount_point);
-    if (mount_it == new_mtab.end()) {
-      new_mtab.insert(std::make_pair(mount_point,
-                                     std::make_pair(device, position)));
-      continue;
-    }
-
-    // There is already a device mounted at |mount_point|. Check to see if
-    // the existing mount entry is newer than the current one.
-    std::string& existing_device = mount_it->second.first;
-    SystemMonitor::DeviceIdType& existing_position = mount_it->second.second;
-    if (existing_position > position)
-      continue;
-
-    // The current entry is newer, update the mount point entry.
-    existing_device = device;
-    existing_position = position;
-  }
-}
-
-bool MediaDeviceNotificationsLinux::IsMediaDevice(
-    const std::string& mount_point) {
-  FilePath dcim_path(mount_point);
-  FilePath::StringType dcim_dir = kDCIMDirName;
-  if (!file_util::DirectoryExists(dcim_path.Append(dcim_dir))) {
-    // Check for lowercase 'dcim' as well.
-    FilePath dcim_path_lower(dcim_path.Append(StringToLowerASCII(dcim_dir)));
-    if (!file_util::DirectoryExists(dcim_path_lower)) {
-      return false;
-    }
-  }
-  return true;
-}
-
-void MediaDeviceNotificationsLinux::AddNewDevice(
-    const std::string& mount_device,
-    const std::string& mount_point,
-    base::SystemMonitor::DeviceIdType* device_id) {
-  *device_id = current_device_id_++;
-  base::SystemMonitor* system_monitor = base::SystemMonitor::Get();
-  system_monitor->ProcessMediaDeviceAttached(*device_id,
-                                             mount_device,
-                                             FilePath(mount_point));
-}
-
-void MediaDeviceNotificationsLinux::RemoveOldDevice(
-    const base::SystemMonitor::DeviceIdType& device_id) {
-  base::SystemMonitor* system_monitor = base::SystemMonitor::Get();
-  system_monitor->ProcessMediaDeviceDetached(device_id);
-}
-
-}  // namespace content