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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef WEBKIT_ACTIVEX_SHIM_ACTIVEX_UTIL_H__
#define WEBKIT_ACTIVEX_SHIM_ACTIVEX_UTIL_H__
#include <windows.h>
#include <comdef.h>
#include <string>
#include "base/logging.h"
#include "webkit/glue/plugins/nphostapi.h"
namespace activex_shim {
class DispatchObject;
// Logging
#ifdef TRACK_INTERFACE
#define TRACK_METHOD() LOG(INFO) << "Called: " << __FUNCTION__
#define TRACK_QUERY_INTERFACE(iid, succeeded) \
TrackQueryInterface(iid, succeeded, __FUNCTION__)
#else
#define TRACK_METHOD()
#define TRACK_QUERY_INTERFACE(iid, succeeded)
#endif
// Unfortunately this value is not defined in any Windows header.
const int kHimetricPerInch = 2540;
// Used in macro to log which interface is queried and if it is successful.
void TrackQueryInterface(REFIID iid, bool succeeded, const char* from_function);
// NP types conversions
bool NPIdentifierToWString(NPIdentifier name, std::wstring* ret);
bool VariantToNPVariant(DispatchObject* obj, const VARIANT* vt, NPVariant* npv);
bool NPVariantToVariant(const NPVariant* npv, VARIANT* vt);
// Dispatch interface helpers
bool DispGetID(IDispatch* disp, const wchar_t* name, DISPID* dispid);
bool DispIsMethodOrProperty(IDispatch* disp, const wchar_t* name,
bool checkmethod);
// This is a general invoke function. Use this function to call methods or
// get properties.
// DO NOT use this function to set properties. Use DispSetProperty instead.
bool DispInvoke(IDispatch* disp, const wchar_t* name, VARIANT* args,
int arg_count, VARIANT* result);
// A special version for PROPERTYSET.
bool DispSetProperty(IDispatch* disp, const wchar_t* name,
const VARIANT& rvalue);
// ActiveX object security
enum ActiveXSafety {
SAFE_FOR_SCRIPTING = 0x1,
SAFE_FOR_INITIALIZING = 0x2,
};
// Gets the IObjectSafety interface of the control and set its safe options.
unsigned long GetAndSetObjectSafetyOptions(IUnknown* control);
// Uses the StdComponentCategoriesMgr to determine the safety options the object
// registered.
unsigned long GetRegisteredObjectSafetyOptions(const CLSID& clsid);
// Coord transformation
// Screen coord to Himetric coord.
long ScreenToHimetricX(long x);
long ScreenToHimetricY(long y);
void ScreenToHimetric(long cx, long cy, SIZE* size);
// Create a copy of the string with memory allocated by CoTaskMemAlloc
wchar_t* CoTaskMemAllocString(const std::wstring& s);
// Reference counted IUnknown implementation.
template <class Base> class IUnknownImpl : public Base {
public:
IUnknownImpl() : ref_(1) {
}
// IUnknown
virtual ULONG STDMETHODCALLTYPE AddRef() { return ++ref_; }
virtual ULONG STDMETHODCALLTYPE Release() {
--ref_;
if (ref_ == 0) {
delete this;
}
}
// We don't add QueryInterface here cause normally the subclass should
// have its own implementation.
private:
ULONG ref_;
};
// The original CComObject does reference counting and delete object when
// reference count reaches 0. This is not desirable for us. If an ActiveX
// control incorrectly decrease our reference, then we will crash. Thus
// let's manage our own life!
template <class Base> class NoRefIUnknownImpl : public Base {
public:
~NoRefIUnknownImpl() {
// Let the base class clean up before destruction. It's dangerous for base
// class to do cleanup in destructor, because we usually create the
// object as: NoRefIUnknownImpl<WebActiveXSite>. So when it
// destructs, the outer NoRefIUnknownImpl destructs first, then virtual
// table pointer of IUnknown interface is modified. At this time if we call
// control's code like IOleInPlaceObject::InPlaceDeactivate, and it calls
// back to IUnknown of myself, it will cause "pure function call" exception.
//
// Using a FinalRelease is what ATL does. I found the reason after getting
// the crashes in base class' destructor.
FinalRelease();
}
// IUnknown
virtual ULONG STDMETHODCALLTYPE AddRef() { return 1; }
virtual ULONG STDMETHODCALLTYPE Release() { return 0; }
// We don't add QueryInterface here cause normally the subclass should
// have its own implementation.
};
// A Minimum IDispatch implementation. Used for other classes who need
// the interface but lazy to implement all the typeinfo etc.
class MinimumIDispatchImpl : public IDispatch {
public:
virtual HRESULT STDMETHODCALLTYPE GetTypeInfoCount(UINT* ctinfo) {
*ctinfo = 0;
return S_OK;
}
virtual HRESULT STDMETHODCALLTYPE GetTypeInfo(UINT itinfo, LCID lcid,
ITypeInfo** tinfo) {
return E_NOTIMPL;
}
virtual HRESULT STDMETHODCALLTYPE GetIDsOfNames(
REFIID riid,
LPOLESTR* names,
UINT cnames,
LCID lcid,
DISPID* dispids) {
return E_NOTIMPL;
}
virtual HRESULT STDMETHODCALLTYPE Invoke(
DISPID dispid,
REFIID riid,
LCID lcid,
WORD flags,
DISPPARAMS* params,
VARIANT* result,
EXCEPINFO* except_info,
UINT* arg_error) {
return E_NOTIMPL;
}
};
// This struct is a simple wrap of VARIANT type, so that it could automatically
// initialize when constructed and clear when destructed.
// DO NOT add any virtual function or variable members to this struct, because
// it could be used in arrays.
struct ScopedVariant : public VARIANT {
ScopedVariant() {
VariantInit(this);
}
~ScopedVariant() {
VariantClear(this);
}
};
} // namespace activex_shim
#endif // #ifndef WEBKIT_ACTIVEX_SHIM_ACTIVEX_UTIL_H__
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