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95 lines
1.8 KiB
C++
95 lines
1.8 KiB
C++
#ifndef NULLSOFT_MAKETHUNKH
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#define NULLSOFT_MAKETHUNKH
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#include <vector>
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class ThunkHolder
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{
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private:
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#pragma pack(push,1)
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class ThisThunk
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{
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private:
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unsigned __int8 mov_eax_imm32;
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unsigned __int32 save_ebx;
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unsigned __int16 mov_reax_ebx;
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unsigned __int8 pop_ebx;
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unsigned __int8 push_imm32;
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unsigned __int32 m_this;
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unsigned __int8 m_call_rel32;
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unsigned __int32 m_rel_proc;
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unsigned __int8 m_pop_eax;
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unsigned __int8 m_push_ebx;
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unsigned __int8 m_mov_ecx_imm32_2;
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unsigned __int32 m_restore_ebx;
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unsigned __int16 m_mov_ebx_recx;
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unsigned __int8 m_ret;
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unsigned __int32 m_ebx;
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public:
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template <class class_t, class proc_t>
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ThisThunk(class_t *pThis, proc_t proc)
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{
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__int32 procAdr = *(__int32 *) & proc;
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/* first, save ebx to memory,
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effectively: save_ebx = ebx;
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*/
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mov_eax_imm32 = 0xB8;
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save_ebx = (__int32) & m_ebx;
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mov_reax_ebx = 0x1889;
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pop_ebx = 0x5B;
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push_imm32 = 0x68;
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m_this = (__int32)pThis;
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m_call_rel32 = 0xE8;
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m_rel_proc = procAdr - (__int32) & m_pop_eax;
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m_pop_eax = 0x59;
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m_push_ebx = 0x53;
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m_mov_ecx_imm32_2 = 0xB9;
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m_restore_ebx = (__int32) & m_ebx;
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m_mov_ebx_recx = 0x198B;
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m_ret = 0xC3;
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}
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/*
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mov eax, &save_ebx
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mov [eax], ebx
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pop ebx
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push pThis
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call rel32 m_relproc
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pop ecx
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push ebx
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mov ecx, &save_ebx
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mov ebx, [ecx]
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ret
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*/
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};
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#pragma pack(pop)
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public:
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template <class class_t, class proc_t, class this_proc_t>
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void operator ()(class_t *pThis, proc_t &proc, this_proc_t thisProc)
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{
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ThisThunk *newThunk = new ThisThunk(pThis, thisProc);
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thunks.push_back(newThunk);
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proc = (proc_t)newThunk;
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}
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~ThunkHolder()
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{
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std::vector<ThisThunk *>::iterator itr;
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for (itr = thunks.begin();itr != thunks.end();itr++)
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{
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delete (*itr);
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*itr = 0;
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}
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thunks.clear();
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}
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std::vector<ThisThunk *> thunks;
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};
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#endif
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