C++ do_CreateInstance函数代码示例

already_AddRefed<nsITransferable>
DataTransfer::GetTransferable(uint32_t aIndex, nsILoadContext* aLoadContext)
{
  if (aIndex >= mItems.Length()) {
    return nullptr;
  }

  nsTArray<TransferItem>& item = mItems[aIndex];
  uint32_t count = item.Length();
  if (!count) {
    return nullptr;
  }

  nsCOMPtr<nsITransferable> transferable =
    do_CreateInstance("@mozilla.org/widget/transferable;1");
  if (!transferable) {
    return nullptr;
  }
  transferable->Init(aLoadContext);

  nsCOMPtr<nsIStorageStream> storageStream;
  nsCOMPtr<nsIBinaryOutputStream> stream;

  bool added = false;
  bool handlingCustomFormats = true;
  uint32_t totalCustomLength = 0;

  const char* knownFormats[] = {
    kTextMime, kHTMLMime, kNativeHTMLMime, kRTFMime,
    kURLMime, kURLDataMime, kURLDescriptionMime, kURLPrivateMime,
    kPNGImageMime, kJPEGImageMime, kGIFImageMime, kNativeImageMime,
    kFileMime, kFilePromiseMime, kFilePromiseURLMime,
    kFilePromiseDestFilename, kFilePromiseDirectoryMime,
    kMozTextInternal, kHTMLContext, kHTMLInfo };

  /*
   * Two passes are made here to iterate over all of the types. First, look for
   * any types that are not in the list of known types. For this pass,
   * handlingCustomFormats will be true. Data that corresponds to unknown types
   * will be pulled out and inserted into a single type (kCustomTypesMime) by
   * writing the data into a stream.
   *
   * The second pass will iterate over the formats looking for known types.
   * These are added as is. The unknown types are all then inserted as a single
   * type (kCustomTypesMime) in the same position of the first custom type. This
   * model is used to maintain the format order as best as possible.
   *
   * The format of the kCustomTypesMime type is one or more of the following
   * stored sequentially:
   *   <32-bit> type (only none or string is supported)
   *   <32-bit> length of format
   *   <wide string> format
   *   <32-bit> length of data
   *   <wide string> data
   * A type of eCustomClipboardTypeId_None ends the list, without any following
   * data.
   */
  do {
    for (uint32_t f = 0; f < count; f++) {
      const TransferItem& formatitem = item[f];
      if (!formatitem.mData) { // skip empty items
        continue;
      }

      // If the data is of one of the well-known formats, use it directly.
      bool isCustomFormat = true;
      for (uint32_t f = 0; f < ArrayLength(knownFormats); f++) {
        if (formatitem.mFormat.EqualsASCII(knownFormats[f])) {
          isCustomFormat = false;
          break;
        }
      }

      uint32_t lengthInBytes;
      nsCOMPtr<nsISupports> convertedData;

      if (handlingCustomFormats) {
        if (!ConvertFromVariant(formatitem.mData, getter_AddRefs(convertedData),
                                &lengthInBytes)) {
          continue;
        }

        // When handling custom types, add the data to the stream if this is a
        // custom type.
        if (isCustomFormat) {
          // If it isn't a string, just ignore it. The dataTransfer is cached in
          // the drag sesion during drag-and-drop, so non-strings will be
          // available when dragging locally.
          nsCOMPtr<nsISupportsString> str(do_QueryInterface(convertedData));
          if (str) {
            nsAutoString data;
            str->GetData(data);

            if (!stream) {
              // Create a storage stream to write to.
              NS_NewStorageStream(1024, UINT32_MAX, getter_AddRefs(storageStream));

              nsCOMPtr<nsIOutputStream> outputStream;
              storageStream->GetOutputStream(0, getter_AddRefs(outputStream));

//.........这里部分代码省略.........

NS_IMETHODIMP
nsNSSDialogs::ChooseCertificate(nsIInterfaceRequestor *ctx, const char16_t *cn, const char16_t *organization, const char16_t *issuer, const char16_t **certNickList, const char16_t **certDetailsList, uint32_t count, int32_t *selectedIndex, bool *canceled) 
{
  nsresult rv;
  uint32_t i;

  *canceled = false;

  // Get the parent window for the dialog
  nsCOMPtr<nsIDOMWindow> parent = do_GetInterface(ctx);

  nsCOMPtr<nsIDialogParamBlock> block =
           do_CreateInstance(NS_DIALOGPARAMBLOCK_CONTRACTID);
  if (!block) return NS_ERROR_FAILURE;

  block->SetNumberStrings(4+count*2);

  rv = block->SetString(0, cn);
  if (NS_FAILED(rv)) return rv;

  rv = block->SetString(1, organization);
  if (NS_FAILED(rv)) return rv;

  rv = block->SetString(2, issuer);
  if (NS_FAILED(rv)) return rv;

  for (i = 0; i < count; i++) {
    rv = block->SetString(i+3, certNickList[i]);
    if (NS_FAILED(rv)) return rv;
  }

  for (i = 0; i < count; i++) {
    rv = block->SetString(i+count+3, certDetailsList[i]);
    if (NS_FAILED(rv)) return rv;
  }

  rv = block->SetInt(0, count);
  if (NS_FAILED(rv)) return rv;

  rv = nsNSSDialogHelper::openDialog(nullptr,
                                "chrome://pippki/content/clientauthask.xul",
                                block);
  if (NS_FAILED(rv)) return rv;

  int32_t status;
  rv = block->GetInt(0, &status);
  if (NS_FAILED(rv)) return rv;

  nsCOMPtr<nsIClientAuthUserDecision> extraResult = do_QueryInterface(ctx);
  if (extraResult) {
    int32_t rememberSelection;
    rv = block->GetInt(2, &rememberSelection);
    if (NS_SUCCEEDED(rv)) {
      extraResult->SetRememberClientAuthCertificate(rememberSelection!=0);
    }
  }

  *canceled = (status == 0)?true:false;
  if (!*canceled) {
    // retrieve the nickname
    rv = block->GetInt(1, selectedIndex);
  }
  return rv;
}

already_AddRefed<nsIPrincipal>
PrincipalInfoToPrincipal(const PrincipalInfo& aPrincipalInfo,
                         nsresult* aOptionalResult)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aPrincipalInfo.type() != PrincipalInfo::T__None);

  nsresult stackResult;
  nsresult& rv = aOptionalResult ? *aOptionalResult : stackResult;

  nsCOMPtr<nsIScriptSecurityManager> secMan =
    do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return nullptr;
  }

  nsCOMPtr<nsIPrincipal> principal;

  switch (aPrincipalInfo.type()) {
    case PrincipalInfo::TSystemPrincipalInfo: {
      rv = secMan->GetSystemPrincipal(getter_AddRefs(principal));
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return nullptr;
      }

      return principal.forget();
    }

    case PrincipalInfo::TNullPrincipalInfo: {
      principal = do_CreateInstance(NS_NULLPRINCIPAL_CONTRACTID, &rv);
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return nullptr;
      }

      return principal.forget();
    }

    case PrincipalInfo::TContentPrincipalInfo: {
      const ContentPrincipalInfo& info =
        aPrincipalInfo.get_ContentPrincipalInfo();

      nsCOMPtr<nsIURI> uri;
      rv = NS_NewURI(getter_AddRefs(uri), info.spec());
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return nullptr;
      }

      if (info.appId() == nsIScriptSecurityManager::UNKNOWN_APP_ID) {
        rv = secMan->GetSimpleCodebasePrincipal(uri, getter_AddRefs(principal));
      } else {
        rv = secMan->GetAppCodebasePrincipal(uri,
                                             info.appId(),
                                             info.isInBrowserElement(),
                                             getter_AddRefs(principal));
      }
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return nullptr;
      }

      return principal.forget();
    }

    case PrincipalInfo::TExpandedPrincipalInfo: {
      const ExpandedPrincipalInfo& info = aPrincipalInfo.get_ExpandedPrincipalInfo();

      nsTArray< nsCOMPtr<nsIPrincipal> > whitelist;
      nsCOMPtr<nsIPrincipal> wlPrincipal;

      for (uint32_t i = 0; i < info.whitelist().Length(); i++) {
        wlPrincipal = PrincipalInfoToPrincipal(info.whitelist()[i], &rv);
        if (NS_WARN_IF(NS_FAILED(rv))) {
          return nullptr;
        }
        // append that principal to the whitelist
        whitelist.AppendElement(wlPrincipal);
      }

      nsRefPtr<nsExpandedPrincipal> expandedPrincipal = new nsExpandedPrincipal(whitelist);
      if (!expandedPrincipal) {
        NS_WARNING("could not instantiate expanded principal");
        return nullptr;
      }

      principal = expandedPrincipal;
      return principal.forget();
    }

    default:
      MOZ_CRASH("Unknown PrincipalInfo type!");
  }

  MOZ_CRASH("Should never get here!");
}

NS_IMETHODIMP nsAutoSyncState::GetNextGroupOfMessages(uint32_t aSuggestedGroupSizeLimit, 
                                                      uint32_t *aActualGroupSize, 
                                                      nsIMutableArray **aMessagesList)
{
  NS_ENSURE_ARG_POINTER(aMessagesList);
  NS_ENSURE_ARG_POINTER(aActualGroupSize);

  *aActualGroupSize = 0;

  nsresult rv;
  nsCOMPtr <nsIMsgFolder> folder = do_QueryReferent(mOwnerFolder, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIMsgDatabase> database;
  folder->GetMsgDatabase(getter_AddRefs(database));

  nsCOMPtr<nsIMutableArray> group = do_CreateInstance(NS_ARRAY_CONTRACTID);
  if (database)
  {
    if (!mDownloadQ.IsEmpty())
    {
      // sort the download queue if new items are added since the last time
      if (mIsDownloadQChanged)
      {
        // we want to sort only pending messages. mOffset is
        // the position of the first pending message in the download queue
        rv = (mOffset > 0)
          ? SortSubQueueBasedOnStrategy(mDownloadQ, mOffset)
          : SortQueueBasedOnStrategy(mDownloadQ);

        if (NS_SUCCEEDED(rv))
          mIsDownloadQChanged = false;
      }

      nsCOMPtr<nsIAutoSyncManager> autoSyncMgr = do_GetService(NS_AUTOSYNCMANAGER_CONTRACTID, &rv);
      NS_ENSURE_SUCCESS(rv, rv);

      uint32_t msgCount = mDownloadQ.Length();
      uint32_t idx = mOffset;

      nsCOMPtr<nsIAutoSyncMsgStrategy> msgStrategy;
      autoSyncMgr->GetMsgStrategy(getter_AddRefs(msgStrategy));

      for (; idx < msgCount; idx++)
      {
        bool containsKey = false;
        database->ContainsKey(mDownloadQ[idx], &containsKey);
        if (!containsKey)
        {
          mDownloadQ.RemoveElementAt(idx--);
          msgCount--;
          continue;
        }
        nsCOMPtr<nsIMsgDBHdr> qhdr;
        database->GetMsgHdrForKey(mDownloadQ[idx], getter_AddRefs(qhdr));
        if(!qhdr)
          continue; //maybe deleted, skip it!

        // ensure that we don't have this message body offline already,
        // possible if the user explicitly selects this message prior
        // to auto-sync kicks in
        uint32_t msgFlags = 0;
        qhdr->GetFlags(&msgFlags);
        if (msgFlags & nsMsgMessageFlags::Offline)
          continue;

        // this check point allows msg strategy function
        // to do last minute decisions based on the current
        // state of TB such as the size of the message store etc.
        if (msgStrategy)
        {
          bool excluded = false;
          if (NS_SUCCEEDED(msgStrategy->IsExcluded(folder, qhdr, &excluded)) && excluded)
            continue;
        }

        uint32_t msgSize;
        qhdr->GetMessageSize(&msgSize);
        // ignore 0 byte messages; the imap parser asserts when we try 
        // to download them, and there's no point anyway.
        if (!msgSize)
          continue;

        if (!*aActualGroupSize && msgSize >= aSuggestedGroupSizeLimit) 
        {
          *aActualGroupSize = msgSize;
          group->AppendElement(qhdr, false);
          idx++;
          break;
        }
        else if ((*aActualGroupSize) + msgSize > aSuggestedGroupSizeLimit)
          break;
        else
        {
          group->AppendElement(qhdr, false);
          *aActualGroupSize += msgSize;
        }
      }// endfor

      mLastOffset = mOffset;
//.........这里部分代码省略.........

NS_IMETHODIMP nsDeviceContextSpecQt::GetSurfaceForPrinter(
        gfxASurface** aSurface)
{
    NS_ENSURE_ARG_POINTER(aSurface);
    *aSurface = nullptr;

    double width, height;
    mPrintSettings->GetEffectivePageSize(&width, &height);

    // If we're in landscape mode, we'll be rotating the output --
    // need to swap width & height.
    int32_t orientation;
    mPrintSettings->GetOrientation(&orientation);
    if (nsIPrintSettings::kLandscapeOrientation == orientation) {
        double tmp = width;
        width = height;
        height = tmp;
    }

    // convert twips to points
    width  /= TWIPS_PER_POINT_FLOAT;
    height /= TWIPS_PER_POINT_FLOAT;

    DO_PR_DEBUG_LOG(("\"%s\", %f, %f\n", mPath, width, height));

    QTemporaryFile file;
    if(!file.open()) {
        return NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE;
    }
    file.setAutoRemove(false);

    nsresult rv = NS_NewNativeLocalFile(
            nsDependentCString(file.fileName().toUtf8().constData()),
            false,
            getter_AddRefs(mSpoolFile));
    if (NS_FAILED(rv)) {
        file.remove();
        return NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE;
    }

    mSpoolName = file.fileName().toUtf8().constData();

    mSpoolFile->SetPermissions(0600);

    nsCOMPtr<nsIFileOutputStream> stream =
        do_CreateInstance("@mozilla.org/network/file-output-stream;1");

    rv = stream->Init(mSpoolFile, -1, -1, 0);
    if (NS_FAILED(rv))
        return rv;

    int16_t format;
    mPrintSettings->GetOutputFormat(&format);

    nsRefPtr<gfxASurface> surface;
    gfxSize surfaceSize(width, height);

    if (format == nsIPrintSettings::kOutputFormatNative) {
        if (mIsPPreview) {
            // There is nothing to detect on Print Preview, use PS.
            // TODO: implement for Qt?
            //format = nsIPrintSettings::kOutputFormatPS;
            return NS_ERROR_NOT_IMPLEMENTED;
        }
        format = nsIPrintSettings::kOutputFormatPDF;
    }
    if (format == nsIPrintSettings::kOutputFormatPDF) {
        surface = new gfxPDFSurface(stream, surfaceSize);
    } else {
        return NS_ERROR_NOT_IMPLEMENTED;
    }

    NS_ABORT_IF_FALSE(surface, "valid address expected");

    surface.swap(*aSurface);
    return NS_OK;
}

NS_IMETHODIMP
DOMStorageObserver::Observe(nsISupports* aSubject,
                            const char* aTopic,
                            const char16_t* aData)
{
  nsresult rv;

  // Start the thread that opens the database.
  if (!strcmp(aTopic, kStartupTopic)) {
    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
    obs->RemoveObserver(this, kStartupTopic);

    mDBThreadStartDelayTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
    if (!mDBThreadStartDelayTimer) {
      return NS_ERROR_UNEXPECTED;
    }

    mDBThreadStartDelayTimer->Init(this, nsITimer::TYPE_ONE_SHOT, kStartupDelay);

    return NS_OK;
  }

  // Timer callback used to start the database a short timer after startup
  if (!strcmp(aTopic, NS_TIMER_CALLBACK_TOPIC)) {
    nsCOMPtr<nsITimer> timer = do_QueryInterface(aSubject);
    if (!timer) {
      return NS_ERROR_UNEXPECTED;
    }

    if (timer == mDBThreadStartDelayTimer) {
      mDBThreadStartDelayTimer = nullptr;

      DOMStorageDBBridge* db = DOMStorageCache::StartDatabase();
      NS_ENSURE_TRUE(db, NS_ERROR_FAILURE);
    }

    return NS_OK;
  }

  // Clear everything, caches + database
  if (!strcmp(aTopic, "cookie-changed")) {
    if (!NS_LITERAL_STRING("cleared").Equals(aData)) {
      return NS_OK;
    }

    DOMStorageDBBridge* db = DOMStorageCache::StartDatabase();
    NS_ENSURE_TRUE(db, NS_ERROR_FAILURE);

    db->AsyncClearAll();

    Notify("cookie-cleared");

    return NS_OK;
  }

  // Clear from caches everything that has been stored
  // while in session-only mode
  if (!strcmp(aTopic, "perm-changed")) {
    // Check for cookie permission change
    nsCOMPtr<nsIPermission> perm(do_QueryInterface(aSubject));
    if (!perm) {
      return NS_OK;
    }

    nsAutoCString type;
    perm->GetType(type);
    if (type != NS_LITERAL_CSTRING("cookie")) {
      return NS_OK;
    }

    uint32_t cap = 0;
    perm->GetCapability(&cap);
    if (!(cap & nsICookiePermission::ACCESS_SESSION) ||
        !NS_LITERAL_STRING("deleted").Equals(nsDependentString(aData))) {
      return NS_OK;
    }

    nsCOMPtr<nsIPrincipal> principal;
    perm->GetPrincipal(getter_AddRefs(principal));
    if (!principal) {
      return NS_OK;
    }

    nsAutoCString originSuffix;
    BasePrincipal::Cast(principal)->OriginAttributesRef().CreateSuffix(originSuffix);

    nsCOMPtr<nsIURI> origin;
    principal->GetURI(getter_AddRefs(origin));
    if (!origin) {
      return NS_OK;
    }

    nsAutoCString host;
    origin->GetHost(host);
    if (host.IsEmpty()) {
      return NS_OK;
    }

    nsAutoCString originScope;
    rv = CreateReversedDomain(host, originScope);
//.........这里部分代码省略.........

NS_IMETHODIMP
nsTypeAheadFind::Find(const nsAString& aSearchString, bool aLinksOnly,
                      PRUint16* aResult)
{
  *aResult = FIND_NOTFOUND;

  nsCOMPtr<nsIPresShell> presShell (GetPresShell());
  if (!presShell) {    
    nsCOMPtr<nsIDocShell> ds (do_QueryReferent(mDocShell));
    NS_ENSURE_TRUE(ds, NS_ERROR_FAILURE);

    ds->GetPresShell(getter_AddRefs(presShell));
    mPresShell = do_GetWeakReference(presShell);    
  }  
  nsCOMPtr<nsISelection> selection;
  nsCOMPtr<nsISelectionController> selectionController = 
    do_QueryReferent(mSelectionController);
  if (!selectionController) {
    GetSelection(presShell, getter_AddRefs(selectionController),
                 getter_AddRefs(selection)); // cache for reuse
    mSelectionController = do_GetWeakReference(selectionController);
  } else {
    selectionController->GetSelection(
      nsISelectionController::SELECTION_NORMAL, getter_AddRefs(selection));
  }

  if (selection)
    selection->CollapseToStart();

  if (aSearchString.IsEmpty()) {
    mTypeAheadBuffer.Truncate();

    // These will be initialized to their true values after the first character
    // is typed
    mStartFindRange = nsnull;
    mSelectionController = nsnull;

    *aResult = FIND_FOUND;
    return NS_OK;
  }

  bool atEnd = false;    
  if (mTypeAheadBuffer.Length()) {
    const nsAString& oldStr = Substring(mTypeAheadBuffer, 0, mTypeAheadBuffer.Length());
    const nsAString& newStr = Substring(aSearchString, 0, mTypeAheadBuffer.Length());
    if (oldStr.Equals(newStr))
      atEnd = true;
  
    const nsAString& newStr2 = Substring(aSearchString, 0, aSearchString.Length());
    const nsAString& oldStr2 = Substring(mTypeAheadBuffer, 0, aSearchString.Length());
    if (oldStr2.Equals(newStr2))
      atEnd = true;
    
    if (!atEnd)
      mStartFindRange = nsnull;
  }

  if (!mIsSoundInitialized && !mNotFoundSoundURL.IsEmpty()) {
    // This makes sure system sound library is loaded so that
    // there's no lag before the first sound is played
    // by waiting for the first keystroke, we still get the startup time benefits.
    mIsSoundInitialized = true;
    mSoundInterface = do_CreateInstance("@mozilla.org/sound;1");
    if (mSoundInterface && !mNotFoundSoundURL.Equals(NS_LITERAL_CSTRING("beep"))) {
      mSoundInterface->Init();
    }
  }

#ifdef XP_WIN
  // After each keystroke, ensure sound object is destroyed, to free up memory 
  // allocated for error sound, otherwise Windows' nsISound impl 
  // holds onto the last played sound, using up memory.
  mSoundInterface = nsnull;
#endif

  PRInt32 bufferLength = mTypeAheadBuffer.Length();

  mTypeAheadBuffer = aSearchString;

  bool isFirstVisiblePreferred = false;

  // --------- Initialize find if 1st char ----------
  if (bufferLength == 0) {
    // If you can see the selection (not collapsed or thru caret browsing),
    // or if already focused on a page element, start there.
    // Otherwise we're going to start at the first visible element
    bool isSelectionCollapsed = true;
    if (selection)
      selection->GetIsCollapsed(&isSelectionCollapsed);

    // If true, we will scan from top left of visible area
    // If false, we will scan from start of selection
    isFirstVisiblePreferred = !atEnd && !mCaretBrowsingOn && isSelectionCollapsed;
    if (isFirstVisiblePreferred) {
      // Get the focused content. If there is a focused node, ensure the
      // selection is at that point. Otherwise, we will just want to start
      // from the caret position or the beginning of the document.
      nsPresContext* presContext = presShell->GetPresContext();
      NS_ENSURE_TRUE(presContext, NS_OK);

//.........这里部分代码省略.........

// The "real" name of a given helper app (as specified by the path to the 
// executable file held in various registry keys) is stored n the VERSIONINFO
// block in the file's resources. We need to find the path to the executable
// and then retrieve the "FileDescription" field value from the file. 
nsresult
nsOSHelperAppService::GetDefaultAppInfo(const nsAString& aAppInfo,
                                        nsAString& aDefaultDescription, 
                                        nsIFile** aDefaultApplication)
{
  nsAutoString handlerCommand;

  // If all else fails, use the file type key name, which will be 
  // something like "pngfile" for .pngs, "WMVFile" for .wmvs, etc. 
  aDefaultDescription = aAppInfo;
  *aDefaultApplication = nullptr;

  if (aAppInfo.IsEmpty())
    return NS_ERROR_FAILURE;

  // aAppInfo may be a file, file path, program id, or
  // Applications reference -
  // c:\dir\app.exe
  // Applications\appfile.exe/dll (shell\open...)
  // ProgID.progid (shell\open...)

  nsAutoString handlerKeyName(aAppInfo);

  nsCOMPtr<nsIWindowsRegKey> chkKey = 
    do_CreateInstance("@mozilla.org/windows-registry-key;1");
  if (!chkKey) 
    return NS_ERROR_FAILURE;
      
  nsresult rv = chkKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
                             handlerKeyName, 
                             nsIWindowsRegKey::ACCESS_QUERY_VALUE);
  if (NS_FAILED(rv)) {
    // It's a file system path to a handler 
    handlerCommand.Assign(aAppInfo);
  }
  else {
    handlerKeyName.AppendLiteral("\\shell\\open\\command");
    nsCOMPtr<nsIWindowsRegKey> regKey = 
      do_CreateInstance("@mozilla.org/windows-registry-key;1");
    if (!regKey) 
      return NS_ERROR_FAILURE;

    nsresult rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
                               handlerKeyName, 
                               nsIWindowsRegKey::ACCESS_QUERY_VALUE);
    if (NS_FAILED(rv))
      return NS_ERROR_FAILURE;
     
    // OK, the default value here is the description of the type.
    rv = regKey->ReadStringValue(EmptyString(), handlerCommand);
    if (NS_FAILED(rv)) {

      // Check if there is a DelegateExecute string
      nsAutoString delegateExecute;
      rv = regKey->ReadStringValue(NS_LITERAL_STRING("DelegateExecute"), delegateExecute);
      NS_ENSURE_SUCCESS(rv, rv);

      // Look for InProcServer32
      nsAutoString delegateExecuteRegPath;
      delegateExecuteRegPath.AssignLiteral("CLSID\\");
      delegateExecuteRegPath.Append(delegateExecute);
      delegateExecuteRegPath.AppendLiteral("\\InProcServer32");
      rv = chkKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
                        delegateExecuteRegPath, 
                        nsIWindowsRegKey::ACCESS_QUERY_VALUE);
      if (NS_SUCCEEDED(rv)) {
        rv = chkKey->ReadStringValue(EmptyString(), handlerCommand);
      }

      if (NS_FAILED(rv)) {
        // Look for LocalServer32
        delegateExecuteRegPath.AssignLiteral("CLSID\\");
        delegateExecuteRegPath.Append(delegateExecute);
        delegateExecuteRegPath.AppendLiteral("\\LocalServer32");
        rv = chkKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
                          delegateExecuteRegPath, 
                          nsIWindowsRegKey::ACCESS_QUERY_VALUE);
        NS_ENSURE_SUCCESS(rv, rv);
        rv = chkKey->ReadStringValue(EmptyString(), handlerCommand);
        NS_ENSURE_SUCCESS(rv, rv);
      }
    }
  }

  if (!CleanupCmdHandlerPath(handlerCommand))
    return NS_ERROR_FAILURE;

  // XXX FIXME: If this fails, the UI will display the full command
  // string.
  // There are some rare cases this can happen - ["url.dll" -foo]
  // for example won't resolve correctly to the system dir. The 
  // subsequent launch of the helper app will work though.
  nsCOMPtr<nsIFile> lf;
  NS_NewLocalFile(handlerCommand, true, getter_AddRefs(lf));
  if (!lf)
    return NS_ERROR_FILE_NOT_FOUND;
//.........这里部分代码省略.........

nsresult
nsPluginStreamListenerPeer::RequestRead(NPByteRange* rangeList)
{
  nsAutoCString rangeString;
  int32_t numRequests;
  
  MakeByteRangeString(rangeList, rangeString, &numRequests);
  
  if (numRequests == 0)
    return NS_ERROR_FAILURE;
  
  nsresult rv = NS_OK;
  
  nsCOMPtr<nsIInterfaceRequestor> callbacks = do_QueryReferent(mWeakPtrChannelCallbacks);
  nsCOMPtr<nsILoadGroup> loadGroup = do_QueryReferent(mWeakPtrChannelLoadGroup);
  nsCOMPtr<nsIChannel> channel;
  rv = NS_NewChannel(getter_AddRefs(channel), mURL, nullptr, loadGroup, callbacks);
  if (NS_FAILED(rv))
    return rv;
  
  nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
  if (!httpChannel)
    return NS_ERROR_FAILURE;
  
  httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Range"), rangeString, false);
  
  mAbort = true; // instruct old stream listener to cancel
  // the request on the next ODA.
  
  nsCOMPtr<nsIStreamListener> converter;
  
  if (numRequests == 1) {
    converter = this;
    // set current stream offset equal to the first offset in the range list
    // it will work for single byte range request
    // for multy range we'll reset it in ODA
    SetStreamOffset(rangeList->offset);
  } else {
    nsWeakPtr weakpeer =
    do_GetWeakReference(static_cast<nsISupportsWeakReference*>(this));
    nsPluginByteRangeStreamListener *brrListener =
    new nsPluginByteRangeStreamListener(weakpeer);
    if (brrListener)
      converter = brrListener;
    else
      return NS_ERROR_OUT_OF_MEMORY;
  }
  
  mPendingRequests += numRequests;
  
  nsCOMPtr<nsISupportsPRUint32> container = do_CreateInstance(NS_SUPPORTS_PRUINT32_CONTRACTID, &rv);
  if (NS_FAILED(rv))
    return rv;
  rv = container->SetData(MAGIC_REQUEST_CONTEXT);
  if (NS_FAILED(rv))
    return rv;
  
  rv = channel->AsyncOpen(converter, container);
  if (NS_SUCCEEDED(rv))
    TrackRequest(channel);
  return rv;
}

bool
nsTypeAheadFind::IsRangeVisible(nsIPresShell *aPresShell,
                                nsPresContext *aPresContext,
                                nsIDOMRange *aRange, bool aMustBeInViewPort,
                                bool aGetTopVisibleLeaf,
                                nsIDOMRange **aFirstVisibleRange,
                                bool *aUsesIndependentSelection)
{
  NS_ASSERTION(aPresShell && aPresContext && aRange && aFirstVisibleRange, 
               "params are invalid");

  // We need to know if the range start is visible.
  // Otherwise, return the first visible range start 
  // in aFirstVisibleRange

  aRange->CloneRange(aFirstVisibleRange);
  nsCOMPtr<nsIDOMNode> node;
  aRange->GetStartContainer(getter_AddRefs(node));

  nsCOMPtr<nsIContent> content(do_QueryInterface(node));
  if (!content)
    return false;

  nsIFrame *frame = content->GetPrimaryFrame();
  if (!frame)    
    return false;  // No frame! Not visible then.

  if (!frame->GetStyleVisibility()->IsVisible())
    return false;

  // Detect if we are _inside_ a text control, or something else with its own
  // selection controller.
  if (aUsesIndependentSelection) {
    *aUsesIndependentSelection = 
      (frame->GetStateBits() & NS_FRAME_INDEPENDENT_SELECTION);
  }

  // ---- We have a frame ----
  if (!aMustBeInViewPort)   
    return true; //  Don't need it to be on screen, just in rendering tree

  // Get the next in flow frame that contains the range start
  PRInt32 startRangeOffset, startFrameOffset, endFrameOffset;
  aRange->GetStartOffset(&startRangeOffset);
  while (true) {
    frame->GetOffsets(startFrameOffset, endFrameOffset);
    if (startRangeOffset < endFrameOffset)
      break;

    nsIFrame *nextContinuationFrame = frame->GetNextContinuation();
    if (nextContinuationFrame)
      frame = nextContinuationFrame;
    else
      break;
  }

  // Set up the variables we need, return true if we can't get at them all
  const PRUint16 kMinPixels  = 12;
  nscoord minDistance = nsPresContext::CSSPixelsToAppUnits(kMinPixels);

  // Get the bounds of the current frame, relative to the current view.
  // We don't use the more accurate AccGetBounds, because that is
  // more expensive and the STATE_OFFSCREEN flag that this is used
  // for only needs to be a rough indicator
  nsRectVisibility rectVisibility = nsRectVisibility_kAboveViewport;

  if (!aGetTopVisibleLeaf && !frame->GetRect().IsEmpty()) {
    rectVisibility =
      aPresShell->GetRectVisibility(frame,
                                    nsRect(nsPoint(0,0), frame->GetSize()),
                                    minDistance);

    if (rectVisibility != nsRectVisibility_kAboveViewport) {
      return true;
    }
  }

  // We know that the target range isn't usable because it's not in the
  // view port. Move range forward to first visible point,
  // this speeds us up a lot in long documents
  nsCOMPtr<nsIFrameEnumerator> frameTraversal;
  nsCOMPtr<nsIFrameTraversal> trav(do_CreateInstance(kFrameTraversalCID));
  if (trav)
    trav->NewFrameTraversal(getter_AddRefs(frameTraversal),
                            aPresContext, frame,
                            eLeaf,
                            false, // aVisual
                            false, // aLockInScrollView
                            false     // aFollowOOFs
                            );

  if (!frameTraversal)
    return false;

  while (rectVisibility == nsRectVisibility_kAboveViewport) {
    frameTraversal->Next();
    frame = frameTraversal->CurrentItem();
    if (!frame)
      return false;

//.........这里部分代码省略.........

nsAutoCompleteResults::nsAutoCompleteResults() :
    mItems(do_CreateInstance(NS_SUPPORTSARRAY_CONTRACTID)),
    mDefaultItemIndex(0)
{
}

nsresult
BackgroundFileSaver::ExtractSignatureInfo(const nsAString& filePath)
{
  MOZ_ASSERT(!NS_IsMainThread(), "Cannot extract signature on main thread");

  nsNSSShutDownPreventionLock nssLock;
  if (isAlreadyShutDown()) {
    return NS_ERROR_NOT_AVAILABLE;
  }
  {
    MutexAutoLock lock(mLock);
    if (!mSignatureInfoEnabled) {
      return NS_OK;
    }
  }
  nsresult rv;
  nsCOMPtr<nsIX509CertDB> certDB = do_GetService(NS_X509CERTDB_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);
#ifdef XP_WIN
  // Setup the file to check.
  WINTRUST_FILE_INFO fileToCheck = {0};
  fileToCheck.cbStruct = sizeof(WINTRUST_FILE_INFO);
  fileToCheck.pcwszFilePath = filePath.Data();
  fileToCheck.hFile = nullptr;
  fileToCheck.pgKnownSubject = nullptr;

  // We want to check it is signed and trusted.
  WINTRUST_DATA trustData = {0};
  trustData.cbStruct = sizeof(trustData);
  trustData.pPolicyCallbackData = nullptr;
  trustData.pSIPClientData = nullptr;
  trustData.dwUIChoice = WTD_UI_NONE;
  trustData.fdwRevocationChecks = WTD_REVOKE_NONE;
  trustData.dwUnionChoice = WTD_CHOICE_FILE;
  trustData.dwStateAction = WTD_STATEACTION_VERIFY;
  trustData.hWVTStateData = nullptr;
  trustData.pwszURLReference = nullptr;
  // Disallow revocation checks over the network
  trustData.dwProvFlags = WTD_CACHE_ONLY_URL_RETRIEVAL;
  // no UI
  trustData.dwUIContext = 0;
  trustData.pFile = &fileToCheck;

  // The WINTRUST_ACTION_GENERIC_VERIFY_V2 policy verifies that the certificate
  // chains up to a trusted root CA and has appropriate permissions to sign
  // code.
  GUID policyGUID = WINTRUST_ACTION_GENERIC_VERIFY_V2;
  // Check if the file is signed by something that is trusted. If the file is
  // not signed, this is a no-op.
  LONG ret = WinVerifyTrust(nullptr, &policyGUID, &trustData);
  CRYPT_PROVIDER_DATA* cryptoProviderData = nullptr;
  // According to the Windows documentation, we should check against 0 instead
  // of ERROR_SUCCESS, which is an HRESULT.
  if (ret == 0) {
    cryptoProviderData = WTHelperProvDataFromStateData(trustData.hWVTStateData);
  }
  if (cryptoProviderData) {
    // Lock because signature information is read on the main thread.
    MutexAutoLock lock(mLock);
    LOG(("Downloaded trusted and signed file [this = %p].", this));
    // A binary may have multiple signers. Each signer may have multiple certs
    // in the chain.
    for (DWORD i = 0; i < cryptoProviderData->csSigners; ++i) {
      const CERT_CHAIN_CONTEXT* certChainContext =
        cryptoProviderData->pasSigners[i].pChainContext;
      if (!certChainContext) {
        break;
      }
      for (DWORD j = 0; j < certChainContext->cChain; ++j) {
        const CERT_SIMPLE_CHAIN* certSimpleChain =
          certChainContext->rgpChain[j];
        if (!certSimpleChain) {
          break;
        }
        nsCOMPtr<nsIX509CertList> nssCertList =
          do_CreateInstance(NS_X509CERTLIST_CONTRACTID);
        if (!nssCertList) {
          break;
        }
        bool extractionSuccess = true;
        for (DWORD k = 0; k < certSimpleChain->cElement; ++k) {
          CERT_CHAIN_ELEMENT* certChainElement = certSimpleChain->rgpElement[k];
          if (certChainElement->pCertContext->dwCertEncodingType !=
            X509_ASN_ENCODING) {
              continue;
          }
          nsCOMPtr<nsIX509Cert> nssCert = nullptr;
          rv = certDB->ConstructX509(
            reinterpret_cast<char *>(
              certChainElement->pCertContext->pbCertEncoded),
            certChainElement->pCertContext->cbCertEncoded,
            getter_AddRefs(nssCert));
          if (!nssCert) {
            extractionSuccess = false;
            LOG(("Couldn't create NSS cert [this = %p]", this));
            break;
          }
          nssCertList->AddCert(nssCert);
          nsString subjectName;
          nssCert->GetSubjectName(subjectName);
//.........这里部分代码省略.........

void
DataTransfer::FillInExternalData(TransferItem& aItem, uint32_t aIndex)
{
  NS_PRECONDITION(mIsExternal, "Not an external data transfer");

  if (aItem.mData) {
    return;
  }

  // only drag and paste events should be calling FillInExternalData
  NS_ASSERTION(mEventMessage != eCut && mEventMessage != eCopy,
               "clipboard event with empty data");

    NS_ConvertUTF16toUTF8 utf8format(aItem.mFormat);
    const char* format = utf8format.get();
    if (strcmp(format, "text/plain") == 0)
      format = kUnicodeMime;
    else if (strcmp(format, "text/uri-list") == 0)
      format = kURLDataMime;

    nsCOMPtr<nsITransferable> trans =
      do_CreateInstance("@mozilla.org/widget/transferable;1");
    if (!trans)
      return;

  trans->Init(nullptr);
  trans->AddDataFlavor(format);

  if (mEventMessage == ePaste) {
    MOZ_ASSERT(aIndex == 0, "index in clipboard must be 0");

    nsCOMPtr<nsIClipboard> clipboard = do_GetService("@mozilla.org/widget/clipboard;1");
    if (!clipboard || mClipboardType < 0) {
      return;
    }

    clipboard->GetData(trans, mClipboardType);
  } else {
    nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
    if (!dragSession) {
      return;
    }

#ifdef DEBUG
    // Since this is an external drag, the source document will always be null.
    nsCOMPtr<nsIDOMDocument> domDoc;
    dragSession->GetSourceDocument(getter_AddRefs(domDoc));
    MOZ_ASSERT(!domDoc);
#endif

    dragSession->GetData(trans, aIndex);
  }

    uint32_t length = 0;
    nsCOMPtr<nsISupports> data;
    trans->GetTransferData(format, getter_AddRefs(data), &length);
    if (!data)
      return;

    nsCOMPtr<nsIWritableVariant> variant = do_CreateInstance(NS_VARIANT_CONTRACTID);
    if (!variant)
      return;

    nsCOMPtr<nsISupportsString> supportsstr = do_QueryInterface(data);
    if (supportsstr) {
      nsAutoString str;
      supportsstr->GetData(str);
      variant->SetAsAString(str);
    }
    else {
      variant->SetAsISupports(data);
    }

    aItem.mData = variant;
  }

already_AddRefed<nsMIMEInfoWin> nsOSHelperAppService::GetByExtension(const nsAFlatString& aFileExt, const char *aTypeHint)
{
  if (aFileExt.IsEmpty())
    return nullptr;

  // windows registry assumes your file extension is going to include the '.'.
  // so make sure it's there...
  nsAutoString fileExtToUse;
  if (aFileExt.First() != char16_t('.'))
    fileExtToUse = char16_t('.');

  fileExtToUse.Append(aFileExt);

  // Try to get an entry from the windows registry.
  nsCOMPtr<nsIWindowsRegKey> regKey = 
    do_CreateInstance("@mozilla.org/windows-registry-key;1");
  if (!regKey) 
    return nullptr; 

  nsresult rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
                             fileExtToUse,
                             nsIWindowsRegKey::ACCESS_QUERY_VALUE);
  if (NS_FAILED(rv))
    return nullptr; 

  nsAutoCString typeToUse;
  if (aTypeHint && *aTypeHint) {
    typeToUse.Assign(aTypeHint);
  }
  else {
    nsAutoString temp;
    if (NS_FAILED(regKey->ReadStringValue(NS_LITERAL_STRING("Content Type"),
                  temp)) || temp.IsEmpty()) {
      return nullptr; 
    }
    // Content-Type is always in ASCII
    LossyAppendUTF16toASCII(temp, typeToUse);
  }

  nsRefPtr<nsMIMEInfoWin> mimeInfo = new nsMIMEInfoWin(typeToUse);

  // don't append the '.'
  mimeInfo->AppendExtension(NS_ConvertUTF16toUTF8(Substring(fileExtToUse, 1)));
  mimeInfo->SetPreferredAction(nsIMIMEInfo::useSystemDefault);

  nsAutoString appInfo;
  bool found;

  // Retrieve the default application for this extension
  if (mAppAssoc) {
    // Vista: use the new application association COM interfaces
    // for resolving helpers.
    nsString assocType(fileExtToUse);
    wchar_t * pResult = nullptr;
    HRESULT hr = mAppAssoc->QueryCurrentDefault(assocType.get(),
                                                AT_FILEEXTENSION, AL_EFFECTIVE,
                                                &pResult);
    if (SUCCEEDED(hr)) {
      found = true;
      appInfo.Assign(pResult);
      CoTaskMemFree(pResult);
    } 
    else {
      found = false;
    }
  } 
  else
  {
    found = NS_SUCCEEDED(regKey->ReadStringValue(EmptyString(), 
                                                 appInfo));
  }

  // Bug 358297 - ignore the default handler, force the user to choose app
  if (appInfo.EqualsLiteral("XPSViewer.Document"))
    found = false;

  if (!found) {
    return nullptr;
  }

  // Get other nsIMIMEInfo fields from registry, if possible.
  nsAutoString defaultDescription;
  nsCOMPtr<nsIFile> defaultApplication;
  
  if (NS_FAILED(GetDefaultAppInfo(appInfo, defaultDescription,
                                  getter_AddRefs(defaultApplication)))) {
    return nullptr;
  }

  mimeInfo->SetDefaultDescription(defaultDescription);
  mimeInfo->SetDefaultApplicationHandler(defaultApplication);

  // Grab the general description
  GetMIMEInfoFromRegistry(appInfo, mimeInfo);

  return mimeInfo.forget();
}

NS_IMETHODIMP
nsCookiePromptService::CookieDialog(nsIDOMWindow *aParent,
                                    nsICookie *aCookie,
                                    const nsACString &aHostname,
                                    PRInt32 aCookiesFromHost,
                                    bool aChangingCookie,
                                    bool *aRememberDecision,
                                    PRInt32 *aAccept)
{
  nsresult rv;

  nsCOMPtr<nsIDialogParamBlock> block = do_CreateInstance(NS_DIALOGPARAMBLOCK_CONTRACTID,&rv);
  if (NS_FAILED(rv)) return rv;

  block->SetInt(nsICookieAcceptDialog::ACCEPT_COOKIE, 1);
  block->SetString(nsICookieAcceptDialog::HOSTNAME, NS_ConvertUTF8toUTF16(aHostname).get());
  block->SetInt(nsICookieAcceptDialog::COOKIESFROMHOST, aCookiesFromHost);
  block->SetInt(nsICookieAcceptDialog::CHANGINGCOOKIE, aChangingCookie ? 1 : 0);
  
  nsCOMPtr<nsIMutableArray> objects =
    do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
  if (NS_FAILED(rv)) return rv;

  rv = objects->AppendElement(aCookie, false);
  if (NS_FAILED(rv)) return rv;

  block->SetObjects(objects);

  nsCOMPtr<nsIWindowWatcher> wwatcher = do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);
  if (NS_FAILED(rv)) return rv;

  nsCOMPtr<nsISupports> arguments = do_QueryInterface(block);
  nsCOMPtr<nsIDOMWindow> dialog;

  nsCOMPtr<nsIDOMWindow> parent(aParent);
  if (!parent) // if no parent provided, consult the window watcher:
    wwatcher->GetActiveWindow(getter_AddRefs(parent));

  if (parent) {
    nsCOMPtr<nsPIDOMWindow> privateParent(do_QueryInterface(parent));
    if (privateParent)
      privateParent = privateParent->GetPrivateRoot();
    parent = do_QueryInterface(privateParent);
  }

  // The cookie dialog will be modal for the root chrome window rather than the
  // tab containing the permission-requesting page.  This removes confusion
  // about which monitor is displaying the dialog (see bug 470356), but also
  // avoids unwanted tab switches (see bug 405239).
  rv = wwatcher->OpenWindow(parent, "chrome://cookie/content/cookieAcceptDialog.xul", "_blank",
                            "centerscreen,chrome,modal,titlebar", arguments,
                            getter_AddRefs(dialog));

  if (NS_FAILED(rv)) return rv;

  // get back output parameters
  PRInt32 tempValue;
  block->GetInt(nsICookieAcceptDialog::ACCEPT_COOKIE, &tempValue);
  *aAccept = tempValue;
  
  // GetInt returns a PRInt32; we need to sanitize it into bool
  block->GetInt(nsICookieAcceptDialog::REMEMBER_DECISION, &tempValue);
  *aRememberDecision = (tempValue == 1);

  return rv;
}