Created
February 26, 2021 05:38
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| #include "chook.h" | |
| CHook::CHook(DWORD Func,SIZE_T Size) | |
| { | |
| pFunc = Func; | |
| DetourSize = Size; | |
| OrigBytes = (PBYTE)malloc(Size); | |
| } | |
| CHook::~CHook() | |
| { | |
| if(hooked) | |
| UnHookFunction(); | |
| } | |
| DWORD CHook::HookFunction(DWORD Hook) | |
| { | |
| DWORD dwProtect; | |
| pHook = Hook; | |
| hooked = true; | |
| VirtualProtect((LPVOID)pFunc,DetourSize,PAGE_EXECUTE_READWRITE,&dwProtect); | |
| memcpy(OrigBytes,(LPVOID)pFunc,DetourSize); | |
| memset((LPVOID)pFunc,'\x90',DetourSize); | |
| *(PBYTE)pFunc = 0xE9; | |
| *(PDWORD)(pFunc+1) = (pHook - pFunc) - 5; | |
| pOrig = (DWORD)VirtualAlloc(NULL,DetourSize+5,MEM_RESERVE | MEM_COMMIT,PAGE_EXECUTE_READWRITE); | |
| memcpy((LPVOID)pOrig,OrigBytes,DetourSize); | |
| *(PBYTE)(pOrig+DetourSize) = 0xE9; | |
| *(PDWORD)(pOrig+DetourSize+1) = ((pFunc+DetourSize) - pOrig) - DetourSize - 5; | |
| VirtualProtect((LPVOID)pFunc,DetourSize,dwProtect,NULL); | |
| return pOrig; | |
| } | |
| DWORD CHook::UnHookFunction() | |
| { | |
| DWORD dwProtect; | |
| hooked = false; | |
| VirtualProtect((LPVOID)pFunc,DetourSize,PAGE_EXECUTE_READWRITE,&dwProtect); | |
| memcpy((LPVOID)pFunc,OrigBytes,DetourSize); | |
| free(OrigBytes); | |
| VirtualFree((LPVOID)pOrig,DetourSize+5,MEM_RELEASE | MEM_DECOMMIT); | |
| return pFunc; | |
| } |
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