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Code Issues Projects Releases Activity

add separate GetDeviceCaps hook for system dlls

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FunkyFr3sh 2024-12-22 23:41:09 +01:00
parent c5058f8371
commit 07aab3b8d2
4 changed files with 24 additions and 0 deletions
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1
inc/hook.h
View File

@ -7,6 +7,7 @@
#define HOOK_SKIP_2 0x00000001l
#define HOOK_LOCAL_ONLY 0x00000002l
#define HOOK_SYSTEM_ONLY 0x00000004l
typedef struct HOOKLISTDATA {
char function_name[32];

1
inc/winapi_hooks.h
View File

@ -41,6 +41,7 @@ LRESULT WINAPI fake_DefWindowProcA(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lP
SHORT WINAPI fake_GetKeyState(int nVirtKey);
SHORT WINAPI fake_GetAsyncKeyState(int vKey);
int WINAPI fake_GetDeviceCaps(HDC hdc, int index);
int WINAPI fake_GetDeviceCaps_system(HDC hdc, int index);
BOOL WINAPI fake_StretchBlt(
HDC hdcDest, int xDest, int yDest, int wDest, int hDest, HDC hdcSrc, int xSrc, int ySrc, int wSrc, int hSrc, DWORD rop);

7
src/hook.c
View File

@ -174,6 +174,7 @@ HOOKLIST g_hook_hooklist[] =
{ "SetDIBitsToDevice", (PROC)fake_SetDIBitsToDevice, (PROC*)&real_SetDIBitsToDevice, HOOK_SKIP_2 },
{ "StretchDIBits", (PROC)fake_StretchDIBits, (PROC*)&real_StretchDIBits, HOOK_SKIP_2 },
{ "GetDeviceCaps", (PROC)fake_GetDeviceCaps, (PROC*)&real_GetDeviceCaps, HOOK_LOCAL_ONLY },
{ "GetDeviceCaps", (PROC)fake_GetDeviceCaps_system, NULL, HOOK_SYSTEM_ONLY },
{ "CreateFontA", (PROC)fake_CreateFontA, (PROC*)&real_CreateFontA, 0 },
{ "GetSystemPaletteEntries", (PROC)fake_GetSystemPaletteEntries, (PROC*)&real_GetSystemPaletteEntries, 0 },
{ "SelectPalette", (PROC)fake_SelectPalette, (PROC*)&real_SelectPalette, 0 },
@ -289,6 +290,9 @@ void hook_patch_obfuscated_iat_list(HMODULE hmod, BOOL unhook, HOOKLIST* hooks,
if (!is_local && (hooks[i].data[x].flags & HOOK_LOCAL_ONLY))
continue;
if (is_local && (hooks[i].data[x].flags & HOOK_SYSTEM_ONLY))
continue;
if (unhook)
{
if (first_thunk->u1.Function == (DWORD)hooks[i].data[x].new_function)
@ -407,6 +411,9 @@ void hook_patch_iat_list(HMODULE hmod, BOOL unhook, HOOKLIST* hooks, BOOL is_loc
if (!is_local && (hooks[i].data[x].flags & HOOK_LOCAL_ONLY))
continue;
if (is_local && (hooks[i].data[x].flags & HOOK_SYSTEM_ONLY))
continue;
#if defined(__GNUC__)
if (util_is_bad_read_ptr((void*)import->Name))
continue;

15
src/winapi_hooks.c
View File

@ -956,6 +956,21 @@ int WINAPI fake_GetDeviceCaps(HDC hdc, int index)
return real_GetDeviceCaps(hdc, index);
}
int WINAPI fake_GetDeviceCaps_system(HDC hdc, int index)
{
if (g_ddraw.ref &&
g_ddraw.bpp == 8 &&
((g_ddraw.hwnd && WindowFromDC(hdc) == g_ddraw.hwnd) || WindowFromDC(hdc) == GetDesktopWindow()))
{
if (index == RASTERCAPS)
{
return RC_PALETTE | real_GetDeviceCaps(hdc, index);
}
}
return real_GetDeviceCaps(hdc, index);
}
BOOL WINAPI fake_StretchBlt(
HDC hdcDest,
int xDest,