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-rw-r--r--src/core/patcher.h192
1 files changed, 192 insertions, 0 deletions
diff --git a/src/core/patcher.h b/src/core/patcher.h
new file mode 100644
index 00000000..87a6bea4
--- /dev/null
+++ b/src/core/patcher.h
@@ -0,0 +1,192 @@
+#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
+
+#include <algorithm>
+#include <vector>
+
+#include "common.h"
+
+enum
+{
+ PATCH_CALL,
+ PATCH_JUMP,
+ PATCH_NOTHING,
+};
+
+enum
+{
+ III_10 = 1,
+ III_11,
+ III_STEAM,
+ VC_10,
+ VC_11,
+ VC_STEAM
+};
+
+extern int gtaversion;
+
+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();
+};
+
+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> inline void
+ClearCC(AT address, unsigned int nCount)
+{
+ DWORD dwProtect[2];
+ VirtualProtect((void*)address, nCount, PAGE_EXECUTE_READWRITE, &dwProtect[0]);
+ memset((void*)address, 0xCC, nCount);
+ VirtualProtect((void*)address, nCount, dwProtect[0], &dwProtect[1]);
+}
+
+extern std::vector<int32> usedAddresses;
+
+template<typename AT, typename HT> inline void
+InjectHook(AT address, HT hook, unsigned int nType=PATCH_NOTHING)
+{
+ if(std::any_of(usedAddresses.begin(), usedAddresses.end(),
+ [address](AT value) { return (int32)value == address; })) {
+ debug("Used address %#06x twice when injecting hook\n", address);
+ }
+
+ usedAddresses.push_back((int32)address);
+
+ 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);
+}
+
+#define STARTPATCHES static StaticPatcher Patcher([](){
+#define ENDPATCHES });