winamp/Src/nu/MakeThunk.h

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2024-09-24 13:54:57 +01:00
#ifndef NULLSOFT_MAKETHUNKH
#define NULLSOFT_MAKETHUNKH
#include <vector>
class ThunkHolder
{
private:
#pragma pack(push,1)
class ThisThunk
{
private:
unsigned __int8 mov_eax_imm32;
unsigned __int32 save_ebx;
unsigned __int16 mov_reax_ebx;
unsigned __int8 pop_ebx;
unsigned __int8 push_imm32;
unsigned __int32 m_this;
unsigned __int8 m_call_rel32;
unsigned __int32 m_rel_proc;
unsigned __int8 m_pop_eax;
unsigned __int8 m_push_ebx;
unsigned __int8 m_mov_ecx_imm32_2;
unsigned __int32 m_restore_ebx;
unsigned __int16 m_mov_ebx_recx;
unsigned __int8 m_ret;
unsigned __int32 m_ebx;
public:
template <class class_t, class proc_t>
ThisThunk(class_t *pThis, proc_t proc)
{
__int32 procAdr = *(__int32 *) & proc;
/* first, save ebx to memory,
effectively: save_ebx = ebx;
*/
mov_eax_imm32 = 0xB8;
save_ebx = (__int32) & m_ebx;
mov_reax_ebx = 0x1889;
pop_ebx = 0x5B;
push_imm32 = 0x68;
m_this = (__int32)pThis;
m_call_rel32 = 0xE8;
m_rel_proc = procAdr - (__int32) & m_pop_eax;
m_pop_eax = 0x59;
m_push_ebx = 0x53;
m_mov_ecx_imm32_2 = 0xB9;
m_restore_ebx = (__int32) & m_ebx;
m_mov_ebx_recx = 0x198B;
m_ret = 0xC3;
}
/*
mov eax, &save_ebx
mov [eax], ebx
pop ebx
push pThis
call rel32 m_relproc
pop ecx
push ebx
mov ecx, &save_ebx
mov ebx, [ecx]
ret
*/
};
#pragma pack(pop)
public:
template <class class_t, class proc_t, class this_proc_t>
void operator ()(class_t *pThis, proc_t &proc, this_proc_t thisProc)
{
ThisThunk *newThunk = new ThisThunk(pThis, thisProc);
thunks.push_back(newThunk);
proc = (proc_t)newThunk;
}
~ThunkHolder()
{
std::vector<ThisThunk *>::iterator itr;
for (itr = thunks.begin();itr != thunks.end();itr++)
{
delete (*itr);
*itr = 0;
}
thunks.clear();
}
std::vector<ThisThunk *> thunks;
};
#endif