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Side by Side Diff: chrome_frame/buggy_bho_handling.h

Issue 126143005: Remove Chrome Frame code and resources. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: sync to r244038 Created 6 years, 11 months ago
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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef CHROME_FRAME_BUGGY_BHO_HANDLING_H_
6 #define CHROME_FRAME_BUGGY_BHO_HANDLING_H_
7
8 #include <atlbase.h>
9 #include <atlcom.h>
10 #include <exdisp.h>
11
12 #include <vector>
13
14 #include "base/threading/thread_local.h"
15 #include "base/win/scoped_comptr.h"
16
17 namespace buggy_bho {
18
19 // Method prototype for IDispatch::Invoke.
20 typedef HRESULT (__stdcall* InvokeFunc)(IDispatch* me, DISPID dispid,
21 REFIID riid, LCID lcid, WORD flags,
22 DISPPARAMS* params, VARIANT* result,
23 EXCEPINFO* ei, UINT* err);
24
25 // Construct a per thread instance of this class before firing web browser
26 // events that can be sent to buggy BHOs. This class will intercept those
27 // BHOs (see list in cc file) and ignore notifications to those components
28 // as long as ChromeFrame is the active view.
29 class BuggyBhoTls {
30 public:
31 // This method traverses the list of DWebBrowserEvents and DWebBrowserEvents2
32 // subscribers and checks if any of the sinks belong to a list of
33 // known-to-be-buggy BHOs.
34 // For each of those, a patch will be applied that temporarily ignores certain
35 // invokes.
36 HRESULT PatchBuggyBHOs(IWebBrowser2* browser);
37
38 // Returns the instance of the BuggyBhoTls object for the current thread.
39 static BuggyBhoTls* GetInstance();
40
41 // Destroys the BuggyBhoTls instance foe the current thread.
42 static void DestroyInstance();
43
44 void set_web_browser(IWebBrowser2* web_browser2) {
45 web_browser2_ = web_browser2;
46 }
47
48 protected:
49 BuggyBhoTls();
50 ~BuggyBhoTls();
51 // internal implementation:
52
53 // Called when a buggy instance is found to be subscribing to browser events.
54 void AddBuggyObject(IDispatch* obj);
55
56 // Called from our patch to check if calls for this object should be ignored.
57 // The reason we do this check is because there might be more than one browser
58 // object running on the same thread (e.g. IE6) with one running CF and the
59 // other MSHTML. We don't want to drop events being fired by MSHTML, only
60 // events fired by CF since these BHOs should handle MSHTML correctly.
61 bool ShouldSkipInvoke(IDispatch* obj) const;
62
63 // Static, protected member methods
64
65 // Patches a subscriber if it belongs to a buggy dll.
66 bool PatchIfBuggy(IUnknown* unk, const IID& diid);
67
68 // Patches the IDispatch::Invoke method.
69 static HRESULT PatchInvokeMethod(PROC* invoke);
70
71 // This is our substitute function that is called instead of the buggy DLLs.
72 // Here we call IsBuggyObject to check if we should ignore invokes or allow
73 // them to go through.
74 static STDMETHODIMP BuggyBhoInvoke(InvokeFunc original, IDispatch* me,
75 DISPID dispid, REFIID riid, LCID lcid, WORD flags, DISPPARAMS* params,
76 VARIANT* result, EXCEPINFO* ei, UINT* err);
77
78 protected:
79 // List of buggy subscribers.
80 std::vector<IDispatch*> bad_objects_;
81 // Where we store the current thread's instance.
82 static base::ThreadLocalPointer<BuggyBhoTls> s_bad_object_tls_;
83 // The IWebBrowser2 instance for this thread.
84 base::win::ScopedComPtr<IWebBrowser2> web_browser2_;
85 // Set to true when we are done patching the event sinks of buggy bho's.
86 bool patched_;
87 };
88
89 } // end namespace buggy_bho
90
91 #endif // CHROME_FRAME_BUGGY_BHO_HANDLING_H_
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