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improve hotpatching

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This commit is contained in:
FunkyFr3sh 2019-03-20 05:07:28 +01:00
parent 822b5c5f32
commit 69b29ebac3
2 changed files with 26 additions and 3 deletions
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24
src/hook.c
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@ -86,8 +86,30 @@ PROC Hook_HotPatch(PROC function, PROC newFunction)
{ {
PROC result = function; PROC result = function;
if (!function)
return result;
unsigned short *bytes = (unsigned short *)function; unsigned short *bytes = (unsigned short *)function;
if (function && *bytes == 0xFF8B) // mov edi, edi
if (*bytes == 0x25FF) // JMP DWORD PTR
{
char *address = (char *)function;
DWORD oldProtect;
if (VirtualProtect(address, 8, PAGE_EXECUTE_READWRITE, &oldProtect))
{
if (memcmp(address + 6, (const char[]) { 0xCC, 0xCC }, 2) == 0 ||
memcmp(address + 6, (const char[]) { 0x90, 0x90 }, 2) == 0)
{
memmove(address + 2, address, 6);
*((WORD *)(&address[0])) = 0xFF8B; // mov edi, edi
}
VirtualProtect(address, 8, oldProtect, &oldProtect);
}
}
if (*bytes == 0xFF8B) // mov edi, edi
{ {
char *address = ((char *)function) - 5; char *address = ((char *)function) - 5;
DWORD oldProtect; DWORD oldProtect;

5
src/settings.c
View File

@ -41,7 +41,7 @@ void Settings_Load()
ddraw->noactivateapp = GetBool("noactivateapp", FALSE); ddraw->noactivateapp = GetBool("noactivateapp", FALSE);
ddraw->vhack = GetBool("vhack", FALSE); ddraw->vhack = GetBool("vhack", FALSE);
ddraw->accurateTimers = GetBool("accuratetimers", FALSE); ddraw->accurateTimers = GetBool("accuratetimers", FALSE);
ddraw->hotPatch = GetBool("hotPatch", FALSE); ddraw->hotPatch = GetBool("hotpatch", FALSE);
WindowRect.right = GetInt("width", 0); WindowRect.right = GetInt("width", 0);
WindowRect.bottom = GetInt("height", 0); WindowRect.bottom = GetInt("height", 0);
@ -277,7 +277,8 @@ static void CreateSettingsIni()
"\n" "\n"
"; Use hotpatching rather than IAT hooking\n" "; Use hotpatching rather than IAT hooking\n"
"; Note: Can be used to fix issues related to new features added by cnc-ddraw such as windowed mode or stretching\n" "; Note: Can be used to fix issues related to new features added by cnc-ddraw such as windowed mode or stretching\n"
"hotPatch=false\n" "hotpatch=false\n"
"\n"
"\n" "\n"
"\n" "\n"
"; ### Game specific settings ###\n" "; ### Game specific settings ###\n"