144 lines
2.8 KiB
C
144 lines
2.8 KiB
C
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// WndProcThunk.h
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// Interfaces to the CWndProcThunk class responsible for WNDPROC class-thunking
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// For details, see http://www.hackcraft.net/cpp/windowsThunk/thiscall/
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// Also available is a CDlgProcThunk class doing the same work for DIALOGPROC
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// MD: Made NX-compat by allocating the code structure using VirtualAlloc(..., PAGE_EXECUTE_READWRITE)
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// fwd:
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template <class W> class CWndProcThunk;
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#ifndef WNDPROCTHUNK_H_INCLUDED
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#define WNDPROCTHUNK_H_INCLUDED
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template<typename To, typename From> inline To union_cast(From fr) throw()
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{
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union
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{
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From f;
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To t;
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} uc;
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uc.f = fr;
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return uc.t;
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}
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#pragma warning(push)
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#pragma warning(disable : 4355)
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#if defined(_M_IX86)
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#pragma pack(push,1)
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template <class W> class CWndProcThunk
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{
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typedef ::LRESULT (W::* WndProc)(::HWND, ::UINT, ::WPARAM, ::LPARAM);
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typedef CWndProcThunk ThisClass;
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struct SCode
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{
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BYTE m_mov; // mov ECX, m_this
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W * m_this; //
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BYTE m_jmp; // jmp m_relproc
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ptrdiff_t m_relproc; // relative jmp
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};
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SCode * Code;
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public:
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ThisClass(WndProc proc, W * obj)
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{
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Code = (SCode *)VirtualAlloc(NULL, sizeof(SCode), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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Code->m_mov = 0xB9,
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Code->m_this = obj,
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Code->m_jmp = 0xE9,
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Code->m_relproc = union_cast<char *>(proc) - reinterpret_cast<char *>(Code) - sizeof(*Code);
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::FlushInstructionCache(::GetCurrentProcess(), Code, sizeof(*Code));
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}
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virtual ~CWndProcThunk()
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{
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VirtualFree(Code, sizeof(*Code), MEM_RELEASE);
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Code = NULL;
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}
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operator ::WNDPROC() const {return reinterpret_cast<::WNDPROC>(Code); }
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operator ::LONG_PTR() const {return reinterpret_cast<::LONG_PTR>(Code); }
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} ;
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template <class W> class CDlgProcThunk
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{
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typedef ::BOOL (W::* DlgProc)(::HWND, ::UINT, ::WPARAM, ::LPARAM);
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typedef CDlgProcThunk ThisClass;
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struct SCode
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{
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BYTE m_mov; // mov ECX, m_this
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W * m_this; //
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BYTE m_jmp; // jmp m_relproc
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ptrdiff_t m_relproc; // relative jmp
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};
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SCode * Code;
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public:
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CDlgProcThunk(DlgProc proc, W * obj)
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{
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Code = (SCode *)VirtualAlloc(NULL, sizeof(SCode), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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Code->m_mov = 0xB9,
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Code->m_this = obj,
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Code->m_jmp = 0xE9,
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Code->m_relproc = union_cast<char *>(proc) - reinterpret_cast<char *>(Code) - sizeof(*Code);
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::FlushInstructionCache(::GetCurrentProcess(), Code, sizeof(*Code));
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}
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virtual ~CDlgProcThunk()
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{
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VirtualFree(Code, sizeof(*Code), MEM_RELEASE);
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Code = NULL;
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}
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operator ::DLGPROC() const {return reinterpret_cast<::DLGPROC>(Code); }
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operator ::LONG_PTR() const {return reinterpret_cast<::LONG_PTR>(Code); }
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} ;
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#pragma pack(pop)
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#else // _M_IX86
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#error Only X86 supported
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#endif
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#endif // WNDPROCTHUNK_H_INCLUDED
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