NS_IMETHODIMP nsSound::PlaySystemSound(const nsAString &aSoundAlias)
{
    if (NS_IsMozAliasSound(aSoundAlias)) {
        NS_WARNING("nsISound::playSystemSound is called with \"_moz_\" events, they are obsolete, use nsISound::playEventSound instead");
        uint32_t eventId;
        if (aSoundAlias.Equals(NS_SYSSOUND_ALERT_DIALOG))
            eventId = EVENT_ALERT_DIALOG_OPEN;
        else if (aSoundAlias.Equals(NS_SYSSOUND_CONFIRM_DIALOG))
            eventId = EVENT_CONFIRM_DIALOG_OPEN;
        else if (aSoundAlias.Equals(NS_SYSSOUND_MAIL_BEEP))
            eventId = EVENT_NEW_MAIL_RECEIVED;
        else if (aSoundAlias.Equals(NS_SYSSOUND_MENU_EXECUTE))
            eventId = EVENT_MENU_EXECUTE;
        else if (aSoundAlias.Equals(NS_SYSSOUND_MENU_POPUP))
            eventId = EVENT_MENU_POPUP;
        else
            return NS_OK;
        return PlayEventSound(eventId);
    }

    nsresult rv;
    nsCOMPtr <nsIURI> fileURI;

    // create a nsIFile and then a nsIFileURL from that
    nsCOMPtr <nsIFile> soundFile;
    rv = NS_NewLocalFile(aSoundAlias, true, 
                         getter_AddRefs(soundFile));
    NS_ENSURE_SUCCESS(rv,rv);

    rv = NS_NewFileURI(getter_AddRefs(fileURI), soundFile);
    NS_ENSURE_SUCCESS(rv,rv);

    nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(fileURI,&rv);
    NS_ENSURE_SUCCESS(rv,rv);

    rv = Play(fileURL);

    return rv;
}

//----------------------------------------------------------------------------------------
static nsresult GetWindowsFolder(int folder, nsILocalFile** aFile)
//----------------------------------------------------------------------------------------
{
#ifdef WINCE
#define SHGetSpecialFolderPathW SHGetSpecialFolderPath

#ifndef WINCE_WINDOWS_MOBILE
    if (folder == CSIDL_APPDATA || folder == CSIDL_LOCAL_APPDATA)
        folder = CSIDL_PROFILE;
#endif
#endif

    WCHAR path_orig[MAX_PATH + 3];
    WCHAR *path = path_orig+1;
    HRESULT result = SHGetSpecialFolderPathW(NULL, path, folder, true);

    if (!SUCCEEDED(result))
        return NS_ERROR_FAILURE;

    // Append the trailing slash
    int len = wcslen(path);
    if (len > 1 && path[len - 1] != L'\\')
    {
        path[len]   = L'\\';
        path[++len] = L'\0';
    }

#if defined(WINCE) && !defined(WINCE_WINDOWS_MOBILE)
    // sometimes CSIDL_PROFILE shows up without a root slash
    if (folder == CSIDL_PROFILE && path[0] != '\\') {
        path_orig[0] = '\\';
        path = path_orig;
        len++;
    }
#endif

    return NS_NewLocalFile(nsDependentString(path, len), PR_TRUE, aFile);
}

void nsBrowserListener::GetProperty(nsIPersistentProperties **prop,nsACString &fileName)
{
  nsresult rv;
  nsCOMPtr<nsIPersistentProperties> tmpprop=do_CreateInstance("@mozilla.org/persistent-properties;1", &rv);
  if (NS_FAILED(rv)) 
    {
      LOG<<"Get properties Error:"<<rv<<"\n";
    }
  nsCOMPtr<nsILocalFile> file;
  rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(fileName), PR_FALSE,
				   getter_AddRefs(file));
  if (NS_FAILED(rv))
    return ;
  nsCOMPtr<nsIInputStream> fistream;
  rv=NS_NewLocalFileInputStream(getter_AddRefs(fistream), file);
  if (NS_FAILED(rv)) 
    {
      return ; 
    }
  tmpprop->Load(fistream);
  *prop=tmpprop;
  NS_ADDREF(*prop);
}

nsresult
MediaEngineDefaultVideoSource::Snapshot(uint32_t aDuration, nsIDOMFile** aFile)
{
  *aFile = nullptr;

#ifndef MOZ_WIDGET_ANDROID
  return NS_ERROR_NOT_IMPLEMENTED;
#else
  if (!AndroidBridge::Bridge()) {
    return NS_ERROR_UNEXPECTED;
  }

  nsAutoString filePath;
  AndroidBridge::Bridge()->ShowFilePickerForMimeType(filePath, NS_LITERAL_STRING("image/*"));

  nsCOMPtr<nsIFile> file;
  nsresult rv = NS_NewLocalFile(filePath, false, getter_AddRefs(file));
  NS_ENSURE_SUCCESS(rv, rv);

  NS_ADDREF(*aFile = new nsDOMFileFile(file));
  return NS_OK;
#endif
}

static bool
GetFileBase(const nsAString& aPluginPath,
#if defined(XP_MACOSX) && defined(MOZ_GMP_SANDBOX)
            nsCOMPtr<nsIFile>& aLibDirectory,
#endif
            nsCOMPtr<nsIFile>& aFileBase,
            nsAutoString& aBaseName)
{
  nsresult rv = NS_NewLocalFile(aPluginPath,
                                true, getter_AddRefs(aFileBase));
  if (NS_FAILED(rv)) {
    return false;
  }

#if defined(XP_MACOSX) && defined(MOZ_GMP_SANDBOX)
  if (NS_FAILED(aFileBase->Clone(getter_AddRefs(aLibDirectory)))) {
    return false;
  }
#endif

  nsCOMPtr<nsIFile> parent;
  rv = aFileBase->GetParent(getter_AddRefs(parent));
  if (NS_FAILED(rv)) {
    return false;
  }

  nsAutoString parentLeafName;
  rv = parent->GetLeafName(parentLeafName);
  if (NS_FAILED(rv)) {
    return false;
  }

  aBaseName = Substring(parentLeafName,
                        4,
                        parentLeafName.Length() - 1);
  return true;
}

NS_IMETHODIMP
nsPluginDirServiceProvider::GetFile(const char *charProp, PRBool *persistant,
                                    nsIFile **_retval)
{
  nsCOMPtr<nsILocalFile>  localFile;
  nsresult rv = NS_ERROR_FAILURE;

  NS_ENSURE_ARG(charProp);

  *_retval = nsnull;
  *persistant = PR_FALSE;

  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (!prefs)
    return NS_ERROR_FAILURE;

  if (nsCRT::strcmp(charProp, NS_WIN_4DOTX_SCAN_KEY) == 0) {
    // Check our prefs to see if scanning the 4.x folder has been
    // explictly overriden failure to get the pref is okay, we'll do
    // what we've been doing -- a filtered scan
    PRBool bScan4x;
    if (NS_SUCCEEDED(prefs->GetBoolPref(NS_WIN_4DOTX_SCAN_KEY, &bScan4x)) &&
        !bScan4x) {
      return NS_ERROR_FAILURE;
    }

    // Look for the plugin folder that the user has in their
    // Communicator 4x install
    HKEY keyloc;
    long result;
    DWORD type;
    WCHAR szKey[_MAX_PATH] = L"Software\\Netscape\\Netscape Navigator";
    WCHAR path[_MAX_PATH];

    result = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, szKey, 0, KEY_READ, &keyloc);

    if (result == ERROR_SUCCESS) {
      WCHAR current_version[80];
      DWORD length = NS_ARRAY_LENGTH(current_version);

      result = ::RegQueryValueExW(keyloc, L"CurrentVersion", NULL, &type,
                                  (LPBYTE)&current_version, &length);

      ::RegCloseKey(keyloc);
      wcscat(szKey, L"\\");
      wcscat(szKey, current_version);
      wcscat(szKey, L"\\Main");
      result = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, szKey, 0, KEY_READ, &keyloc);

      if (result == ERROR_SUCCESS) {
        DWORD pathlen = NS_ARRAY_LENGTH(path);

        result = ::RegQueryValueExW(keyloc, L"Plugins Directory", NULL, &type,
                                   (LPBYTE)&path, &pathlen);
        if (result == ERROR_SUCCESS) {
          rv = NS_NewLocalFile(nsDependentString(path),
                               PR_TRUE, getter_AddRefs(localFile));
        }

        ::RegCloseKey(keyloc);
      }
    }
  } else if (nsCRT::strcmp(charProp, NS_WIN_JRE_SCAN_KEY) == 0) {
    nsXPIDLCString strVer;
    if (NS_FAILED(prefs->GetCharPref(charProp, getter_Copies(strVer))))
      return NS_ERROR_FAILURE;
    verBlock minVer;
    TranslateVersionStr(NS_ConvertASCIItoUTF16(strVer).get(), &minVer);

    // Look for the Java OJI plugin via the JRE install path
    HKEY baseloc;
    HKEY keyloc;
    HKEY entryloc;
    FILETIME modTime;
    DWORD type;
    DWORD index = 0;
    DWORD numChars = _MAX_PATH;
    DWORD pathlen;
    verBlock maxVer;
    ClearVersion(&maxVer);
    WCHAR curKey[_MAX_PATH] = L"Software\\JavaSoft\\Java Runtime Environment";
    WCHAR path[_MAX_PATH];
    // Add + 15 to prevent buffer overrun when adding \bin (+ optionally
    // \new_plugin)
#define JAVA_PATH_SIZE _MAX_PATH + 15
    WCHAR newestPath[JAVA_PATH_SIZE];
    const WCHAR mozPath[_MAX_PATH] = L"Software\\mozilla.org\\Mozilla";
    WCHAR browserJavaVersion[_MAX_PATH];

    newestPath[0] = 0;
    LONG result = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE, curKey, 0, KEY_READ,
                                  &baseloc);
    if (ERROR_SUCCESS != result)
      return NS_ERROR_FAILURE;

    // Look for "BrowserJavaVersion"
    if (ERROR_SUCCESS != ::RegQueryValueExW(baseloc, L"BrowserJavaVersion", NULL,
                                            NULL, (LPBYTE)&browserJavaVersion,
                                            &numChars))
      browserJavaVersion[0] = 0;
//.........这里部分代码省略.........

void
GeckoMediaPluginServiceParent::RemoveOnGMPThread(const nsAString& aDirectory,
                                                 const bool aDeleteFromDisk,
                                                 const bool aCanDefer)
{
  MOZ_ASSERT(NS_GetCurrentThread() == mGMPThread);
  LOGD(("%s::%s: %s", __CLASS__, __FUNCTION__, NS_LossyConvertUTF16toASCII(aDirectory).get()));

  nsCOMPtr<nsIFile> directory;
  nsresult rv = NS_NewLocalFile(aDirectory, false, getter_AddRefs(directory));
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  // Plugin destruction can modify |mPlugins|. Put them aside for now and
  // destroy them once we're done with |mPlugins|.
  nsTArray<nsRefPtr<GMPParent>> deadPlugins;

  bool inUse = false;
  MutexAutoLock lock(mMutex);
  for (size_t i = mPlugins.Length() - 1; i < mPlugins.Length(); i--) {
    nsCOMPtr<nsIFile> pluginpath = mPlugins[i]->GetDirectory();
    bool equals;
    if (NS_FAILED(directory->Equals(pluginpath, &equals)) || !equals) {
      continue;
    }

    nsRefPtr<GMPParent> gmp = mPlugins[i];
    if (aDeleteFromDisk && gmp->State() != GMPStateNotLoaded) {
      // We have to wait for the child process to release its lib handle
      // before we can delete the GMP.
      inUse = true;
      gmp->MarkForDeletion();

      if (!mPluginsWaitingForDeletion.Contains(aDirectory)) {
        mPluginsWaitingForDeletion.AppendElement(aDirectory);
      }
    }

    if (gmp->State() == GMPStateNotLoaded || !aCanDefer) {
      // GMP not in use or shutdown is being forced; can shut it down now.
      deadPlugins.AppendElement(gmp);
      mPlugins.RemoveElementAt(i);
    }
  }

  {
    MutexAutoUnlock unlock(mMutex);
    for (auto& gmp : deadPlugins) {
      gmp->AbortAsyncShutdown();
      gmp->CloseActive(true);
    }
  }

  if (aDeleteFromDisk && !inUse) {
    if (NS_SUCCEEDED(directory->Remove(true))) {
      mPluginsWaitingForDeletion.RemoveElement(aDirectory);
      NS_DispatchToMainThread(new NotifyObserversTask("gmp-directory-deleted",
                                                      nsString(aDirectory)),
                              NS_DISPATCH_NORMAL);
    }
  }
}

nsresult
GetSpecialSystemDirectory(SystemDirectories aSystemSystemDirectory,
                          nsIFile** aFile)
{
#if defined(XP_WIN)
    WCHAR path[MAX_PATH];
#else
    char path[MAXPATHLEN];
#endif

    switch (aSystemSystemDirectory)
    {
        case OS_CurrentWorkingDirectory:
#if defined(XP_WIN)
            if (!_wgetcwd(path, MAX_PATH))
                return NS_ERROR_FAILURE;
            return NS_NewLocalFile(nsDependentString(path),
                                   true,
                                   aFile);
#elif defined(XP_OS2)
            if (DosQueryPathInfo( ".", FIL_QUERYFULLNAME, path, MAXPATHLEN))
                return NS_ERROR_FAILURE;
#else
            if(!getcwd(path, MAXPATHLEN))
                return NS_ERROR_FAILURE;
#endif

#if !defined(XP_WIN)
            return NS_NewNativeLocalFile(nsDependentCString(path),
                                         true,
                                         aFile);
#endif

        case OS_DriveDirectory:
#if defined (XP_WIN)
        {
            PRInt32 len = ::GetWindowsDirectoryW(path, MAX_PATH);
            if (len == 0)
                break;
            if (path[1] == PRUnichar(':') && path[2] == PRUnichar('\\'))
                path[3] = 0;

            return NS_NewLocalFile(nsDependentString(path),
                                   true,
                                   aFile);
        }
#elif defined(XP_OS2)
        {
            ULONG ulBootDrive = 0;
            char  buffer[] = " :\\OS2\\";
            DosQuerySysInfo( QSV_BOOT_DRIVE, QSV_BOOT_DRIVE,
                             &ulBootDrive, sizeof ulBootDrive);
            buffer[0] = 'A' - 1 + ulBootDrive; // duh, 1-based index...

            return NS_NewNativeLocalFile(nsDependentCString(buffer),
                                         true,
                                         aFile);
        }
#else
        return NS_NewNativeLocalFile(nsDependentCString("/"),
                                     true,
                                     aFile);

#endif

        case OS_TemporaryDirectory:
#if defined (XP_WIN)
            {
            DWORD len = ::GetTempPathW(MAX_PATH, path);
            if (len == 0)
                break;
            return NS_NewLocalFile(nsDependentString(path, len),
                                   true,
                                   aFile);
        }
#elif defined(XP_OS2)
        {
            char *tPath = PR_GetEnv("TMP");
            if (!tPath || !*tPath) {
                tPath = PR_GetEnv("TEMP");
                if (!tPath || !*tPath) {
                    // if an OS/2 system has neither TMP nor TEMP defined
                    // then it is severely broken, so this will never happen.
                    return NS_ERROR_UNEXPECTED;
                }
            }
            nsCString tString = nsDependentCString(tPath);
            if (tString.Find("/", false, 0, -1)) {
                tString.ReplaceChar('/','\\');
            }
            return NS_NewNativeLocalFile(tString, true, aFile);
        }
#elif defined(MOZ_WIDGET_COCOA)
        {
            return GetOSXFolderType(kUserDomain, kTemporaryFolderType, aFile);
        }

#elif defined(XP_UNIX)
        {
            static const char *tPath = nullptr;
//.........这里部分代码省略.........

bool
DeviceStorageRequestChild::Recv__delete__(const DeviceStorageResponseValue& aValue)
{
  switch (aValue.type()) {

    case DeviceStorageResponseValue::TErrorResponse:
    {
      ErrorResponse r = aValue;
      mRequest->FireError(r.error());
      break;
    }

    case DeviceStorageResponseValue::TSuccessResponse:
    {
      jsval result = StringToJsval(mRequest->GetOwner(), mFile->mPath);
      mRequest->FireSuccess(result);
      break;
    }

    case DeviceStorageResponseValue::TBlobResponse:
    {
      BlobResponse r = aValue;
      BlobChild* actor = static_cast<BlobChild*>(r.blobChild());
      nsCOMPtr<nsIDOMBlob> blob = actor->GetBlob();

      jsval result = InterfaceToJsval(mRequest->GetOwner(), blob, &NS_GET_IID(nsIDOMBlob));
      mRequest->FireSuccess(result);
      break;
    }

    case DeviceStorageResponseValue::TStatStorageResponse:
    {
      StatStorageResponse r = aValue;

      nsRefPtr<nsIDOMDeviceStorageStat> domstat = new nsDOMDeviceStorageStat(r.freeBytes(), r.totalBytes(), r.mountState());
      jsval result = InterfaceToJsval(mRequest->GetOwner(), domstat, &NS_GET_IID(nsIDOMDeviceStorageStat));
      mRequest->FireSuccess(result);
      break;
    }

    case DeviceStorageResponseValue::TEnumerationResponse:
    {
      EnumerationResponse r = aValue;
      nsDOMDeviceStorageCursor* cursor = static_cast<nsDOMDeviceStorageCursor*>(mRequest.get());

      uint32_t count = r.paths().Length();
      for (uint32_t i = 0; i < count; i++) {
        nsCOMPtr<nsIFile> f;
        nsresult rv = NS_NewLocalFile(r.paths()[i].fullpath(), false, getter_AddRefs(f));
        if (NS_FAILED(rv)) {
          continue;
        }

        nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(r.paths()[i].type(), f);
        dsf->SetPath(r.paths()[i].name());
        cursor->mFiles.AppendElement(dsf);
      }

      nsCOMPtr<ContinueCursorEvent> event = new ContinueCursorEvent(cursor);
      NS_DispatchToMainThread(event);
      break;
    }

    default:
    {
      NS_RUNTIMEABORT("not reached");
      break;
    }
  }
  return true;
}

nsresult
nsPluginDirServiceProvider::GetPLIDDirectoriesWithHKEY(HKEY aKey, nsCOMArray<nsILocalFile> &aDirs)
{
  WCHAR subkey[_MAX_PATH] = L"Software\\MozillaPlugins";
  HKEY baseloc;

  if (ERROR_SUCCESS != ::RegOpenKeyExW(aKey, subkey, 0, KEY_READ, &baseloc))
    return NS_ERROR_FAILURE;

  DWORD index = 0;
  DWORD subkeylen = _MAX_PATH;
  FILETIME modTime;
  while (ERROR_SUCCESS == ::RegEnumKeyExW(baseloc, index++, subkey, &subkeylen,
                                          NULL, NULL, NULL, &modTime)) {
    subkeylen = _MAX_PATH;
    HKEY keyloc;

    if (ERROR_SUCCESS == ::RegOpenKeyExW(baseloc, subkey, 0, KEY_QUERY_VALUE,
                                         &keyloc)) {
      DWORD type;
      WCHAR path[_MAX_PATH];
      DWORD pathlen = NS_ARRAY_LENGTH(path);

      if (ERROR_SUCCESS == ::RegQueryValueExW(keyloc, L"Path", NULL, &type,
                                              (LPBYTE)&path, &pathlen)) {
        nsCOMPtr<nsILocalFile> localFile;
        if (NS_SUCCEEDED(NS_NewLocalFile(nsDependentString(path), PR_TRUE,
                                         getter_AddRefs(localFile))) &&
            localFile)
        {
          // Some vendors use a path directly to the DLL so chop off
          // the filename
          PRBool isDir = PR_FALSE;
          if (NS_SUCCEEDED(localFile->IsDirectory(&isDir)) && !isDir) {
            nsCOMPtr<nsIFile> temp;
            localFile->GetParent(getter_AddRefs(temp));
            if (temp)
              localFile = do_QueryInterface(temp);
          }

          // Now we check to make sure it's actually on disk and
          // To see if we already have this directory in the array
          PRBool isFileThere = PR_FALSE;
          PRBool isDupEntry = PR_FALSE;
          if (NS_SUCCEEDED(localFile->Exists(&isFileThere)) && isFileThere) {
            PRInt32 c = aDirs.Count();
            for (PRInt32 i = 0; i < c; i++) {
              nsIFile *dup = static_cast<nsIFile*>(aDirs[i]);
              if (dup &&
                  NS_SUCCEEDED(dup->Equals(localFile, &isDupEntry)) &&
                  isDupEntry) {
                break;
              }
            }

            if (!isDupEntry) {
              aDirs.AppendObject(localFile);
            }
          }
        }
      }
      ::RegCloseKey(keyloc);
    }
  }
  ::RegCloseKey(baseloc);
  return NS_OK;
}

//.........这里部分代码省略.........
        fail("NTFS Permissions: LocalAlloc Error");
        return NS_ERROR_FAILURE; 
    }

    if (!InitializeSecurityDescriptor(dirSD,
            SECURITY_DESCRIPTOR_REVISION)) 
    {  
        fail("NTFS Permissions: InitializeSecurityDescriptor Error");
        return NS_ERROR_FAILURE; 
    } 

    // Add the ACL to the security descriptor. 
    if (!SetSecurityDescriptorDacl(dirSD, true, dirACL, false)) 
    {  
        fail("NTFS Permissions: SetSecurityDescriptorDacl Error");
        return NS_ERROR_FAILURE;  
    } 

    // Initialize a security attributes structure.
    sa.nLength = sizeof (SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = dirSD;
    sa.bInheritHandle = false;

    // Create and open first temporary directory
    if(!CreateDirectoryW(L".\\NTFSPERMTEMP1", &sa))
    {
        fail("NTFS Permissions: Creating Temporary Directory");
        return NS_ERROR_FAILURE;
    }

    GetFullPathNameW((LPCWSTR)L".\\NTFSPERMTEMP1", MAX_PATH, dir1Path, NULL);


    rv = NS_NewLocalFile(nsEmbedString(dir1Path), false,
                         getter_AddRefs(tempDirectory1));
    if (NS_FAILED(rv))
    {
        fail("NTFS Permissions: Opening Temporary Directory 1");
        return rv;
    }


    // Create and open temporary file
    tempFileHandle = CreateFileW(L".\\NTFSPERMTEMP1\\NTFSPerm.tmp", 
                            GENERIC_READ | GENERIC_WRITE,
                            0, 
                            NULL, //default security
                            CREATE_ALWAYS,        
                            FILE_ATTRIBUTE_NORMAL,
                            NULL);  

    if(tempFileHandle == INVALID_HANDLE_VALUE)
    {
        fail("NTFS Permissions: Creating Temporary File");
        return NS_ERROR_FAILURE;
    }

    CloseHandle(tempFileHandle);

    GetFullPathNameW((LPCWSTR)L".\\NTFSPERMTEMP1\\NTFSPerm.tmp", 
                        MAX_PATH, filePath, NULL);

    rv = NS_NewLocalFile(nsEmbedString(filePath), false,
                         getter_AddRefs(tempFile));
    if (NS_FAILED(rv))
    {

DeviceStorageRequestParent::DeviceStorageRequestParent(const DeviceStorageParams& aParams)
{
  MOZ_COUNT_CTOR(DeviceStorageRequestParent);

  switch (aParams.type()) {
    case DeviceStorageParams::TDeviceStorageAddParams:
    {
      DeviceStorageAddParams p = aParams;

      nsCOMPtr<nsIFile> f;
      NS_NewLocalFile(p.fullpath(), false, getter_AddRefs(f));

      nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(f);

      BlobParent* bp = static_cast<BlobParent*>(p.blobParent());
      nsCOMPtr<nsIDOMBlob> blob = bp->GetBlob();

      nsCOMPtr<nsIInputStream> stream;
      blob->GetInternalStream(getter_AddRefs(stream));

      nsRefPtr<CancelableRunnable> r = new WriteFileEvent(this, dsf, stream);

      nsCOMPtr<nsIEventTarget> target = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
      NS_ASSERTION(target, "Must have stream transport service");
      target->Dispatch(r, NS_DISPATCH_NORMAL);
      break;
    }

    case DeviceStorageParams::TDeviceStorageGetParams:
    {
      DeviceStorageGetParams p = aParams;

      nsCOMPtr<nsIFile> f;
      NS_NewLocalFile(p.fullpath(), false, getter_AddRefs(f));

      nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(f);
      dsf->SetPath(p.name());
      nsRefPtr<CancelableRunnable> r = new ReadFileEvent(this, dsf);

      nsCOMPtr<nsIEventTarget> target = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
      NS_ASSERTION(target, "Must have stream transport service");
      target->Dispatch(r, NS_DISPATCH_NORMAL);
      break;
    }

    case DeviceStorageParams::TDeviceStorageDeleteParams:
    {
      DeviceStorageDeleteParams p = aParams;

      nsCOMPtr<nsIFile> f;
      NS_NewLocalFile(p.fullpath(), false, getter_AddRefs(f));

      nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(f);
      nsRefPtr<CancelableRunnable> r = new DeleteFileEvent(this, dsf);

      nsCOMPtr<nsIEventTarget> target = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
      NS_ASSERTION(target, "Must have stream transport service");
      target->Dispatch(r, NS_DISPATCH_NORMAL);
      break;
    }

    case DeviceStorageParams::TDeviceStorageStatParams:
    {
      DeviceStorageStatParams p = aParams;

      nsCOMPtr<nsIFile> f;
      NS_NewLocalFile(p.fullpath(), false, getter_AddRefs(f));

      nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(f);
      nsRefPtr<StatFileEvent> r = new StatFileEvent(this, dsf);

      nsCOMPtr<nsIEventTarget> target = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
      NS_ASSERTION(target, "Must have stream transport service");
      target->Dispatch(r, NS_DISPATCH_NORMAL);
      break;
    }

    case DeviceStorageParams::TDeviceStorageEnumerationParams:
    {
      DeviceStorageEnumerationParams p = aParams;

      nsCOMPtr<nsIFile> f;
      NS_NewLocalFile(p.fullpath(), false, getter_AddRefs(f));

      nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(f);
      nsRefPtr<CancelableRunnable> r = new EnumerateFileEvent(this, dsf, p.since());

      nsCOMPtr<nsIEventTarget> target = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
      NS_ASSERTION(target, "Must have stream transport service");
      target->Dispatch(r, NS_DISPATCH_NORMAL);
      break;
    }
    default:
    {
      NS_RUNTIMEABORT("not reached");
      break;
    }
  }
}

//----------------------------------------------------------------------------------------
// GetProductDirectory - Gets the directory which contains the application data folder
//
// UNIX   : ~/.mozilla/
// WIN    : <Application Data folder on user's machine>\Mozilla
// Mac    : :Documents:Mozilla:
//----------------------------------------------------------------------------------------
NS_METHOD
nsAppFileLocationProvider::GetProductDirectory(nsIFile** aLocalFile,
                                               bool aLocal)
{
  if (NS_WARN_IF(!aLocalFile)) {
    return NS_ERROR_INVALID_ARG;
  }

  nsresult rv;
  bool exists;
  nsCOMPtr<nsIFile> localDir;

#if defined(MOZ_WIDGET_COCOA)
  FSRef fsRef;
  OSType folderType = aLocal ? (OSType)kCachedDataFolderType :
                               (OSType)kDomainLibraryFolderType;
  OSErr err = ::FSFindFolder(kUserDomain, folderType, kCreateFolder, &fsRef);
  if (err) {
    return NS_ERROR_FAILURE;
  }
  NS_NewLocalFile(EmptyString(), true, getter_AddRefs(localDir));
  if (!localDir) {
    return NS_ERROR_FAILURE;
  }
  nsCOMPtr<nsILocalFileMac> localDirMac(do_QueryInterface(localDir));
  rv = localDirMac->InitWithFSRef(&fsRef);
  if (NS_FAILED(rv)) {
    return rv;
  }
#elif defined(XP_WIN)
  nsCOMPtr<nsIProperties> directoryService =
    do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
  if (NS_FAILED(rv)) {
    return rv;
  }
  const char* prop = aLocal ? NS_WIN_LOCAL_APPDATA_DIR : NS_WIN_APPDATA_DIR;
  rv = directoryService->Get(prop, NS_GET_IID(nsIFile), getter_AddRefs(localDir));
  if (NS_FAILED(rv)) {
    return rv;
  }
#elif defined(XP_UNIX)
  rv = NS_NewNativeLocalFile(nsDependentCString(PR_GetEnv("HOME")), true,
                             getter_AddRefs(localDir));
  if (NS_FAILED(rv)) {
    return rv;
  }
#else
#error dont_know_how_to_get_product_dir_on_your_platform
#endif

  rv = localDir->AppendRelativeNativePath(DEFAULT_PRODUCT_DIR);
  if (NS_FAILED(rv)) {
    return rv;
  }
  rv = localDir->Exists(&exists);

  if (NS_SUCCEEDED(rv) && !exists) {
    rv = localDir->Create(nsIFile::DIRECTORY_TYPE, 0700);
  }

  if (NS_FAILED(rv)) {
    return rv;
  }

  localDir.forget(aLocalFile);

  return rv;
}

nsresult
GetSpecialSystemDirectory(SystemDirectories aSystemSystemDirectory,
                          nsIFile** aFile)
{
#if defined(XP_WIN)
    WCHAR path[MAX_PATH];
#else
    char path[MAXPATHLEN];
#endif

    switch (aSystemSystemDirectory)
    {
        case OS_CurrentWorkingDirectory:
#if defined(XP_WIN)
            if (!_wgetcwd(path, MAX_PATH))
                return NS_ERROR_FAILURE;
            return NS_NewLocalFile(nsDependentString(path),
                                   true,
                                   aFile);
#else
            if(!getcwd(path, MAXPATHLEN))
                return NS_ERROR_FAILURE;
#endif

#if !defined(XP_WIN)
            return NS_NewNativeLocalFile(nsDependentCString(path),
                                         true,
                                         aFile);
#endif

        case OS_DriveDirectory:
#if defined (XP_WIN)
        {
            int32_t len = ::GetWindowsDirectoryW(path, MAX_PATH);
            if (len == 0)
                break;
            if (path[1] == PRUnichar(':') && path[2] == PRUnichar('\\'))
                path[3] = 0;

            return NS_NewLocalFile(nsDependentString(path),
                                   true,
                                   aFile);
        }
#else
        return NS_NewNativeLocalFile(nsDependentCString("/"),
                                     true,
                                     aFile);

#endif

        case OS_TemporaryDirectory:
#if defined (XP_WIN)
            {
            DWORD len = ::GetTempPathW(MAX_PATH, path);
            if (len == 0)
                break;
            return NS_NewLocalFile(nsDependentString(path, len),
                                   true,
                                   aFile);
        }
#elif defined(MOZ_WIDGET_COCOA)
        {
            return GetOSXFolderType(kUserDomain, kTemporaryFolderType, aFile);
        }

#elif defined(XP_UNIX)
        {
            static const char *tPath = nullptr;
            if (!tPath) {
                tPath = PR_GetEnv("PANDORATMP");
            if (!tPath) {
                tPath = PR_GetEnv("TMPDIR");
                if (!tPath || !*tPath) {
                    tPath = PR_GetEnv("TMP");
                    if (!tPath || !*tPath) {
                        tPath = PR_GetEnv("TEMP");
                        if (!tPath || !*tPath) {
                            tPath = "/tmp/";
                        }
                    }
                }
            }
            }
            return NS_NewNativeLocalFile(nsDependentCString(tPath),
                                         true,
                                         aFile);
        }
#else
        break;
#endif
#if defined (XP_WIN)
        case Win_SystemDirectory:
        {
            int32_t len = ::GetSystemDirectoryW(path, MAX_PATH);

            // Need enough space to add the trailing backslash
            if (!len || len > MAX_PATH - 2)
                break;
            path[len]   = L'\\';
            path[++len] = L'\0';
//.........这里部分代码省略.........

//----------------------------------------------------------------------------------------
// GetProductDirectory - Gets the directory which contains the application data folder
//
// UNIX   : ~/.mozilla/
// WIN    : <Application Data folder on user's machine>\Mozilla
// Mac    : :Documents:Mozilla:
//----------------------------------------------------------------------------------------
NS_METHOD nsAppFileLocationProvider::GetProductDirectory(nsILocalFile **aLocalFile, PRBool aLocal)
{
    NS_ENSURE_ARG_POINTER(aLocalFile);

    nsresult rv;
    PRBool exists;
    nsCOMPtr<nsILocalFile> localDir;

#if defined(XP_MACOSX)
    FSRef fsRef;
    OSType folderType = aLocal ? kCachedDataFolderType : kDomainLibraryFolderType;
    OSErr err = ::FSFindFolder(kUserDomain, folderType, kCreateFolder, &fsRef);
    if (err) return NS_ERROR_FAILURE;
    NS_NewLocalFile(EmptyString(), PR_TRUE, getter_AddRefs(localDir));
    if (!localDir) return NS_ERROR_FAILURE;
    nsCOMPtr<nsILocalFileMac> localDirMac(do_QueryInterface(localDir));
    rv = localDirMac->InitWithFSRef(&fsRef);
    if (NS_FAILED(rv)) return rv;
#elif defined(XP_OS2)
    nsCOMPtr<nsIProperties> directoryService = 
             do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
    if (NS_FAILED(rv)) return rv;
    rv = directoryService->Get(NS_OS2_HOME_DIR, NS_GET_IID(nsILocalFile), getter_AddRefs(localDir));
    if (NS_FAILED(rv)) return rv;
#elif defined(XP_WIN)
    nsCOMPtr<nsIProperties> directoryService = 
             do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
    if (NS_FAILED(rv)) return rv;
    const char* prop = aLocal ? NS_WIN_LOCAL_APPDATA_DIR : NS_WIN_APPDATA_DIR;
    rv = directoryService->Get(prop, NS_GET_IID(nsILocalFile), getter_AddRefs(localDir));
    if (NS_SUCCEEDED(rv))
        rv = localDir->Exists(&exists);
    if (NS_FAILED(rv) || !exists)
    {
        // On some Win95 machines, NS_WIN_APPDATA_DIR does not exist - revert to NS_WIN_WINDOWS_DIR
        localDir = nsnull;
        rv = directoryService->Get(NS_WIN_WINDOWS_DIR, NS_GET_IID(nsILocalFile), getter_AddRefs(localDir));
    }
    if (NS_FAILED(rv)) return rv;
#elif defined(XP_UNIX)
    rv = NS_NewNativeLocalFile(nsDependentCString(PR_GetEnv("HOME")), PR_TRUE, getter_AddRefs(localDir));
    if (NS_FAILED(rv)) return rv;
#elif defined(XP_BEOS)
    char path[MAXPATHLEN];
    find_directory(B_USER_SETTINGS_DIRECTORY, 0, 0, path, MAXPATHLEN);
    // Need enough space to add the trailing backslash
    int len = strlen(path);
    if (len > MAXPATHLEN-2)
        return NS_ERROR_FAILURE;
    path[len]   = '/';
    path[len+1] = '\0';
    rv = NS_NewNativeLocalFile(nsDependentCString(path), PR_TRUE, getter_AddRefs(localDir));
    if (NS_FAILED(rv)) return rv;
#else
#error dont_know_how_to_get_product_dir_on_your_platform
#endif

    rv = localDir->AppendRelativeNativePath(DEFAULT_PRODUCT_DIR);
    if (NS_FAILED(rv)) return rv;
    rv = localDir->Exists(&exists);

    if (NS_SUCCEEDED(rv) && !exists)
        rv = localDir->Create(nsIFile::DIRECTORY_TYPE, 0700);

    if (NS_FAILED(rv)) return rv;

    *aLocalFile = localDir;
    NS_ADDREF(*aLocalFile);

   return rv;
}

nsresult
MediaEngineWebRTCVideoSource::Snapshot(PRUint32 aDuration, nsIDOMFile** aFile)
{
  /**
   * To get a Snapshot we do the following:
   * - Set a condition variable (mInSnapshotMode) to true
   * - Attach the external renderer and start the camera
   * - Wait for the condition variable to change to false
   *
   * Starting the camera has the effect of invoking DeliverFrame() when
   * the first frame arrives from the camera. We only need one frame for
   * GetCaptureDeviceSnapshot to work, so we immediately set the condition
   * variable to false and notify this method.
   *
   * This causes the current thread to continue (PR_CondWaitVar will return),
   * at which point we can grab a snapshot, convert it to a file and
   * return from this function after cleaning up the temporary stream object
   * and caling Stop() on the media source.
   */
  *aFile = nsnull;
  if (!mInitDone || mState != kAllocated) {
    return NS_ERROR_FAILURE;
  }

  mSnapshotLock = PR_NewLock();
  mSnapshotCondVar = PR_NewCondVar(mSnapshotLock);

  PR_Lock(mSnapshotLock);
  mInSnapshotMode = true;

  // Start the rendering (equivalent to calling Start(), but without a track).
  int error = 0;
  if (!mInitDone || mState != kAllocated) {
    return NS_ERROR_FAILURE;
  }
  error = mViERender->AddRenderer(mCapIndex, webrtc::kVideoI420, (webrtc::ExternalRenderer*)this);
  if (error == -1) {
    return NS_ERROR_FAILURE;
  }
  error = mViERender->StartRender(mCapIndex);
  if (error == -1) {
    return NS_ERROR_FAILURE;
  }

  // Wait for the condition variable, will be set in DeliverFrame.
  // We use a while loop, because even if PR_WaitCondVar returns, it's not
  // guaranteed that the condition variable changed.
  while (mInSnapshotMode) {
    PR_WaitCondVar(mSnapshotCondVar, PR_INTERVAL_NO_TIMEOUT);
  }

  // If we get here, DeliverFrame received at least one frame.
  PR_Unlock(mSnapshotLock);
  PR_DestroyCondVar(mSnapshotCondVar);
  PR_DestroyLock(mSnapshotLock);

  webrtc::ViEFile* vieFile = webrtc::ViEFile::GetInterface(mVideoEngine);
  if (!vieFile) {
    return NS_ERROR_FAILURE;
  }

  // Create a temporary file on the main thread and put the snapshot in it.
  // See Run() in MediaEngineWebRTCVideo.h (sets mSnapshotPath).
  NS_DispatchToMainThread(this, NS_DISPATCH_SYNC);

  if (!mSnapshotPath) {
    return NS_ERROR_FAILURE;
  }

  const char* path = NS_ConvertUTF16toUTF8(*mSnapshotPath).get();
  if (vieFile->GetCaptureDeviceSnapshot(mCapIndex, path) < 0) {
    delete mSnapshotPath;
    mSnapshotPath = NULL;
    return NS_ERROR_FAILURE;
  }

  // Stop the camera.
  mViERender->StopRender(mCapIndex);
  mViERender->RemoveRenderer(mCapIndex);

  nsCOMPtr<nsIFile> file;
  nsresult rv = NS_NewLocalFile(*mSnapshotPath, false, getter_AddRefs(file));

  delete mSnapshotPath;
  mSnapshotPath = NULL;

  NS_ENSURE_SUCCESS(rv, rv);

  NS_ADDREF(*aFile = new nsDOMFileFile(file));

  return NS_OK;
}

nsresult
nsXREDirProvider::GetUserDataDirectoryHome(nsIFile** aFile, bool aLocal)
{
  // Copied from nsAppFileLocationProvider (more or less)
  nsresult rv;
  nsCOMPtr<nsIFile> localDir;

#if defined(XP_MACOSX)
  FSRef fsRef;
  OSType folderType;
  if (aLocal) {
    folderType = kCachedDataFolderType;
  } else {
#ifdef MOZ_THUNDERBIRD
    folderType = kDomainLibraryFolderType;
#else
    folderType = kApplicationSupportFolderType;
#endif
  }
  OSErr err = ::FSFindFolder(kUserDomain, folderType, kCreateFolder, &fsRef);
  NS_ENSURE_FALSE(err, NS_ERROR_FAILURE);

  rv = NS_NewNativeLocalFile(EmptyCString(), true, getter_AddRefs(localDir));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsILocalFileMac> dirFileMac = do_QueryInterface(localDir);
  NS_ENSURE_TRUE(dirFileMac, NS_ERROR_UNEXPECTED);

  rv = dirFileMac->InitWithFSRef(&fsRef);
  NS_ENSURE_SUCCESS(rv, rv);

  localDir = do_QueryInterface(dirFileMac, &rv);
#elif defined(XP_WIN)
  nsString path;
  if (aLocal) {
    rv = GetShellFolderPath(CSIDL_LOCAL_APPDATA, path);
    if (NS_FAILED(rv))
      rv = GetRegWindowsAppDataFolder(aLocal, path);
  }
  if (!aLocal || NS_FAILED(rv)) {
    rv = GetShellFolderPath(CSIDL_APPDATA, path);
    if (NS_FAILED(rv)) {
      if (!aLocal)
        rv = GetRegWindowsAppDataFolder(aLocal, path);
    }
  }
  NS_ENSURE_SUCCESS(rv, rv);

  rv = NS_NewLocalFile(path, true, getter_AddRefs(localDir));
#elif defined(XP_OS2)
#if 0 /* For OS/2 we want to always use MOZILLA_HOME */
  // we want an environment variable of the form
  // FIREFOX_HOME, etc
  if (!gAppData)
    return NS_ERROR_FAILURE;
  nsDependentCString envVar(nsDependentCString(gAppData->name));
  envVar.Append("_HOME");
  char *pHome = getenv(envVar.get());
#endif
  char *pHome = getenv("MOZILLA_HOME");
  if (pHome && *pHome) {
    rv = NS_NewNativeLocalFile(nsDependentCString(pHome), true,
                               getter_AddRefs(localDir));
  } else {
    PPIB ppib;
    PTIB ptib;
    char appDir[CCHMAXPATH];

    DosGetInfoBlocks(&ptib, &ppib);
    DosQueryModuleName(ppib->pib_hmte, CCHMAXPATH, appDir);
    *strrchr(appDir, '\\') = '\0';
    rv = NS_NewNativeLocalFile(nsDependentCString(appDir), true, getter_AddRefs(localDir));
  }
#elif defined(MOZ_WIDGET_GONK)
  rv = NS_NewNativeLocalFile(NS_LITERAL_CSTRING("/data/b2g"), true,
                             getter_AddRefs(localDir));
#elif defined(XP_UNIX)
  const char* homeDir = getenv("HOME");
  if (!homeDir || !*homeDir)
    return NS_ERROR_FAILURE;

#ifdef ANDROID /* We want (ProfD == ProfLD) on Android. */
  aLocal = false;
#endif

  if (aLocal) {
    // If $XDG_CACHE_HOME is defined use it, otherwise use $HOME/.cache.
    const char* cacheHome = getenv("XDG_CACHE_HOME");
    if (cacheHome && *cacheHome) {
      rv = NS_NewNativeLocalFile(nsDependentCString(cacheHome), true,
                                 getter_AddRefs(localDir));
    } else {
      rv = NS_NewNativeLocalFile(nsDependentCString(homeDir), true,
                                 getter_AddRefs(localDir));
      if (NS_SUCCEEDED(rv))
        rv = localDir->AppendNative(NS_LITERAL_CSTRING(".cache"));
    }
  } else {
    rv = NS_NewNativeLocalFile(nsDependentCString(homeDir), true,
                               getter_AddRefs(localDir));
//.........这里部分代码省略.........