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-fix a bug in GetDisplayNumberFromDeviceName

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-don't overwrite memory in IntEnumDisplaySettings

svn path=/trunk/; revision=28934
This commit is contained in:
Christoph von Wittich 2007-09-08 07:43:45 +00:00
parent 6a0d3658f6
commit 30dc779d1c
1 changed files with 13 additions and 28 deletions
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37
reactos/subsystems/win32/win32k/objects/dc.c
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@ -2736,7 +2736,7 @@ GetDisplayNumberFromDeviceName(
*DisplayNumber = ((GDIDEVICE *)pDC->GDIDevice)->DisplayNumber;
DC_UnlockDc(DesktopHDC);
DC_UnlockDc(pDC);
UserReleaseDC(DesktopObject, DesktopHDC, FALSE);
return STATUS_SUCCESS;
@ -2787,7 +2787,6 @@ IntEnumDisplaySettings(
static UNICODE_STRING CachedDeviceName;
PDEVMODEW CachedMode = NULL;
DEVMODEW DevMode;
INT Size, OldSize;
ULONG DisplayNumber;
if (!NT_SUCCESS(GetDisplayNumberFromDeviceName(pDeviceName, &DisplayNumber)))
@ -2999,20 +2998,9 @@ IntEnumDisplaySettings(
ASSERT(CachedMode != NULL);
Size = OldSize = pDevMode->dmSize;
if (Size > CachedMode->dmSize)
Size = CachedMode->dmSize;
RtlCopyMemory(pDevMode, CachedMode, Size);
RtlZeroMemory((PCHAR)pDevMode + Size, OldSize - Size);
pDevMode->dmSize = OldSize;
Size = OldSize = pDevMode->dmDriverExtra;
if (Size > CachedMode->dmDriverExtra)
Size = CachedMode->dmDriverExtra;
RtlCopyMemory((PCHAR)pDevMode + pDevMode->dmSize,
(PCHAR)CachedMode + CachedMode->dmSize, Size);
RtlZeroMemory((PCHAR)pDevMode + pDevMode->dmSize + Size, OldSize - Size);
pDevMode->dmDriverExtra = OldSize;
RtlCopyMemory(pDevMode, CachedMode, pDevMode->dmSize);
RtlZeroMemory(pDevMode + pDevMode->dmSize, pDevMode->dmDriverExtra);
RtlCopyMemory(pDevMode + pDevMode->dmSize, CachedMode + CachedMode->dmSize, min(pDevMode->dmDriverExtra, CachedMode->dmDriverExtra));
return TRUE;
}
@ -3162,7 +3150,7 @@ IntChangeDisplaySettings(
LONG Ret=0;
NTSTATUS Status ;
DPRINT1("display flag : %x\n",dwflags);
DPRINT1("display flags : %x\n",dwflags);
if ((dwflags & CDS_UPDATEREGISTRY) == CDS_UPDATEREGISTRY)
{
@ -3185,7 +3173,7 @@ IntChangeDisplaySettings(
if (dwflags == 0)
{
/* Dynamically change graphics mode */
DPRINT1("flag 0 UNIMPLEMENT \n");
DPRINT1("flag 0 UNIMPLEMENTED\n");
return DISP_CHANGE_FAILED;
}
@ -3193,7 +3181,7 @@ IntChangeDisplaySettings(
{
/* Test reslution */
dwflags &= ~CDS_TEST;
DPRINT1("flag CDS_TEST UNIMPLEMENT");
DPRINT1("flag CDS_TEST UNIMPLEMENTED\n");
Ret = DISP_CHANGE_FAILED;
}
@ -3202,15 +3190,12 @@ IntChangeDisplaySettings(
DEVMODEW lpDevMode;
/* Full Screen */
dwflags &= ~CDS_FULLSCREEN;
DPRINT1("flag CDS_FULLSCREEN partially implemented");
DPRINT1("flag CDS_FULLSCREEN partially implemented\n");
Ret = DISP_CHANGE_FAILED;
lpDevMode.dmBitsPerPel =0;
lpDevMode.dmPelsWidth =0;
lpDevMode.dmPelsHeight =0;
lpDevMode.dmDriverExtra =0;
RtlZeroMemory(&lpDevMode, sizeof(DEVMODEW));
lpDevMode.dmSize = sizeof(DEVMODEW);
if (!IntEnumDisplaySettings(pDeviceName, ENUM_CURRENT_SETTINGS, &lpDevMode, 0))
return DISP_CHANGE_FAILED;
@ -3231,7 +3216,7 @@ IntChangeDisplaySettings(
Ret=DISP_CHANGE_BADPARAM;
else
{
DPRINT1("flag CDS_VIDEOPARAMETERS UNIMPLEMENT");
DPRINT1("flag CDS_VIDEOPARAMETERS UNIMPLEMENTED\n");
Ret = DISP_CHANGE_FAILED;
}