JmpPatch

void JmpPatch(void *pDest, void *pSrc, int nNops = 0) {
    DWORD OldProt;
    VirtualProtect(pSrc, 5 + nNops, PAGE_EXECUTE_READWRITE, &OldProt);
    *(char*)pSrc = (char)0xE9;
    *(DWORD*)((DWORD)pSrc + 1) = (DWORD)pDest - (DWORD)pSrc - 5;
    for (int i = 0; i < nNops; ++i) { *(BYTE*)((DWORD)pSrc + 5 + i) = 0x90; }
    VirtualProtect(pSrc, 5 + nNops, OldProt, &OldProt);
}