Set an upper limit to the number of characters that can appear in a tooltip s...

chrome/browser/render_widget_host_hwnd.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/render_widget_host_hwnd.h"
 
 #include "base/command_line.h"
 #include "base/gfx/bitmap_header.h"
 #include "base/gfx/rect.h"
 #include "base/histogram.h"
 #include "base/win_util.h"
 #include "chrome/browser/render_process_host.h"
 // TODO(beng): (Cleanup) we should not need to include this file... see comment
 //             in |DidBecomeSelected|.
 #include "chrome/browser/render_view_host.h"
 #include "chrome/browser/render_widget_host.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/l10n_util.h"
 #include "chrome/common/plugin_messages.h"
 #include "chrome/common/win_util.h"
 #include "chrome/views/hwnd_view_container.h"
 #include "webkit/glue/webcursor.h"
 
 // Tooltips will wrap after this width. Yes, wrap. Imagine that!
 static const int kTooltipMaxWidthPixels = 300;
 
+// Maximum number of characters we allow in a tooltip.
+static const int kMaxTooltipLength = 1024;
+
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostHWND, public:
 
 RenderWidgetHostHWND::RenderWidgetHostHWND(
     RenderWidgetHost* render_widget_host)
     : RenderWidgetHostView(),
       render_widget_host_(render_widget_host),
       real_cursor_(LoadCursor(NULL, IDC_ARROW)),
       real_cursor_type_(WebCursor::ARROW),
       track_mouse_leave_(false),
@@ skipping 252 matching lines @@
   // (caused by windows messages resulting from the DestroyWindow) from
   // triggering further destructions.  The deletion of this is handled by
   // OnFinalMessage();
   close_on_deactivate_ = false;
   DestroyWindow();
 }
 
 void RenderWidgetHostHWND::SetTooltipText(const std::wstring& tooltip_text) {
   if (tooltip_text != tooltip_text_) {
     tooltip_text_ = tooltip_text;
+
+    // Clamp the tooltip length to kMaxTooltipLength so that we don't
+    // accidentally DOS the user with a mega tooltip (since Windows doesn't seem
+    // to do this itself).
+    if (tooltip_text_.length() > kMaxTooltipLength)
+      tooltip_text_ = tooltip_text_.substr(0, kMaxTooltipLength);
+
     // Need to check if the tooltip is already showing so that we don't
     // immediately show the tooltip with no delay when we move the mouse from
     // a region with no tooltip to a region with a tooltip.
     if (::IsWindow(tooltip_hwnd_) && tooltip_showing_) {
       ::SendMessage(tooltip_hwnd_, TTM_POP, 0, 0);
       ::SendMessage(tooltip_hwnd_, TTM_POPUP, 0, 0);
     }
   } else {
     // Make sure the tooltip gets closed after TTN_POP gets sent. For some
     // reason this doesn't happen automatically, so moving the mouse around
@@ skipping 527 matching lines @@
 
   return TRUE;
 }
 
 void RenderWidgetHostHWND::ShutdownHost() {
   shutdown_factory_.RevokeAll();
   render_widget_host_->Shutdown();
   // Do not touch any members at this point, |this| has been deleted.
 }