From 600bf0351476a5a21aabb5429132ddf7f52ac0b9 Mon Sep 17 00:00:00 2001
From: aap <aap@papnet.eu>
Date: Wed, 15 May 2019 16:52:37 +0200
Subject: first commit

---
 src/patcher.h | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 src/patcher.h

(limited to 'src/patcher.h')

diff --git a/src/patcher.h b/src/patcher.h
new file mode 100644
index 00000000..4ac1111b
--- /dev/null
+++ b/src/patcher.h
@@ -0,0 +1,171 @@
+#pragma once
+
+#define WRAPPER __declspec(naked)
+#define DEPRECATED __declspec(deprecated)
+#define EAXJMP(a) { _asm mov eax, a _asm jmp eax }
+#define VARJMP(a) { _asm jmp a }
+#define WRAPARG(a) UNREFERENCED_PARAMETER(a)
+
+#define NOVMT __declspec(novtable)
+#define SETVMT(a) *((DWORD_PTR*)this) = (DWORD_PTR)a
+
+enum
+{
+	PATCH_CALL,
+	PATCH_JUMP,
+	PATCH_NOTHING,
+};
+
+enum
+{
+	III_10 = 1,
+	III_11,
+	III_STEAM,
+	VC_10,
+	VC_11,
+	VC_STEAM
+};
+
+extern int gtaversion;
+
+template<typename T>
+inline T AddressByVersion(uint32_t addressIII10, uint32_t addressIII11, uint32_t addressIIISteam, uint32_t addressvc10, uint32_t addressvc11, uint32_t addressvcSteam)
+{
+	if(gtaversion == -1){
+		     if(*(uint32_t*)0x5C1E75 == 0xB85548EC) gtaversion = III_10;
+		else if(*(uint32_t*)0x5C2135 == 0xB85548EC) gtaversion = III_11;
+		else if(*(uint32_t*)0x5C6FD5 == 0xB85548EC) gtaversion = III_STEAM;
+		else if(*(uint32_t*)0x667BF5 == 0xB85548EC) gtaversion = VC_10;
+		else if(*(uint32_t*)0x667C45 == 0xB85548EC) gtaversion = VC_11;
+		else if(*(uint32_t*)0x666BA5 == 0xB85548EC) gtaversion = VC_STEAM;
+		else gtaversion = 0;
+	}
+	switch(gtaversion){
+	case III_10:
+		return (T)addressIII10;
+	case III_11:
+		return (T)addressIII11;
+	case III_STEAM:
+		return (T)addressIIISteam;
+	case VC_10:
+		return (T)addressvc10;
+	case VC_11:
+		return (T)addressvc11;
+	case VC_STEAM:
+		return (T)addressvcSteam;
+	default:
+		return (T)0;
+	}
+}
+
+inline bool
+is10(void)
+{
+	return gtaversion == III_10 || gtaversion == VC_10;
+}
+
+inline bool
+isIII(void)
+{
+	return gtaversion >= III_10 && gtaversion <= III_STEAM;
+}
+
+inline bool
+isVC(void)
+{
+	return gtaversion >= VC_10 && gtaversion <= VC_STEAM;
+}
+
+#define PTRFROMCALL(addr) (uint32_t)(*(uint32_t*)((uint32_t)addr+1) + (uint32_t)addr + 5)
+#define INTERCEPT(saved, func, a) \
+{ \
+	saved = PTRFROMCALL(a); \
+	InjectHook(a, func); \
+}
+
+template<typename T, typename AT> inline void
+Patch(AT address, T value)
+{
+	DWORD		dwProtect[2];
+	VirtualProtect((void*)address, sizeof(T), PAGE_EXECUTE_READWRITE, &dwProtect[0]);
+	*(T*)address = value;
+	VirtualProtect((void*)address, sizeof(T), dwProtect[0], &dwProtect[1]);
+}
+
+template<typename AT> inline void
+Nop(AT address, unsigned int nCount)
+{
+	DWORD		dwProtect[2];
+	VirtualProtect((void*)address, nCount, PAGE_EXECUTE_READWRITE, &dwProtect[0]);
+	memset((void*)address, 0x90, nCount);
+	VirtualProtect((void*)address, nCount, dwProtect[0], &dwProtect[1]);
+}
+
+template<typename AT, typename HT> inline void
+InjectHook(AT address, HT hook, unsigned int nType=PATCH_NOTHING)
+{
+	DWORD		dwProtect[2];
+	switch ( nType )
+	{
+	case PATCH_JUMP:
+		VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &dwProtect[0]);
+		*(BYTE*)address = 0xE9;
+		break;
+	case PATCH_CALL:
+		VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &dwProtect[0]);
+		*(BYTE*)address = 0xE8;
+		break;
+	default:
+		VirtualProtect((void*)((DWORD)address + 1), 4, PAGE_EXECUTE_READWRITE, &dwProtect[0]);
+		break;
+	}
+	DWORD		dwHook;
+	_asm
+	{
+		mov		eax, hook
+		mov		dwHook, eax
+	}
+
+	*(ptrdiff_t*)((DWORD)address + 1) = (DWORD)dwHook - (DWORD)address - 5;
+	if ( nType == PATCH_NOTHING )
+		VirtualProtect((void*)((DWORD)address + 1), 4, dwProtect[0], &dwProtect[1]);
+	else
+		VirtualProtect((void*)address, 5, dwProtect[0], &dwProtect[1]);
+}
+
+inline void ExtractCall(void *dst, uint32_t a)
+{
+	*(uint32_t*)dst = (uint32_t)(*(uint32_t*)(a+1) + a + 5);
+}
+template<typename T>
+inline void InterceptCall(void *dst, T func, uint32_t a)
+{
+	ExtractCall(dst, a);
+	InjectHook(a, func);
+}
+template<typename T>
+inline void InterceptVmethod(void *dst, T func, uint32_t a)
+{
+	*(uint32_t*)dst = *(uint32_t*)a;
+	Patch(a, func);
+}
+
+
+
+class StaticPatcher
+{
+private:
+	using Patcher = void(*)();
+
+	Patcher		m_func;
+	StaticPatcher	*m_next;
+	static StaticPatcher	*ms_head;
+
+	void Run() { m_func(); }
+public:
+	StaticPatcher(Patcher func);
+	static void Apply();
+};
+
+#define STARTPATCHES static StaticPatcher Patcher([](){
+#define ENDPATCHES });
-- 
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