gditools.c File Reference

#include <windef.h>
#include <winbase.h>
#include <wingdi.h>
#include <winddi.h>
#include <prntfont.h>
#include <ndk/ntndk.h>
#include <ntgdityp.h>
#include <ntgdi.h>
#include <ntgdihdl.h>

Include dependency graph for gditools.c:

Go to the source code of this file.

Macros
#define	WIN32_NO_STATUS
#define	NTOS_MODE_USER

Functions
PENTRY	GdiQueryTable (VOID)
BOOL	GdiIsHandleValid (_In_ HGDIOBJ hobj)
BOOL	GdiIsHandleValidEx (_In_ HGDIOBJ hobj, _In_ GDILOOBJTYPE ObjectType)
PVOID	GdiGetHandleUserData (_In_ HGDIOBJ hobj)

Macro Definition Documentation

NTOS_MODE_USER

#define NTOS_MODE_USER

Definition at line 11 of file gditools.c.

WIN32_NO_STATUS

#define WIN32_NO_STATUS

Definition at line 4 of file gditools.c.

Function Documentation

GdiGetHandleUserData()

PVOID GdiGetHandleUserData

(

_In_ HGDIOBJ

hobj

)

Definition at line 68 of file gditools.c.

{
    PENTRY pentHmgr = GdiQueryTable();
    USHORT Index = (ULONG_PTR)hobj;
    PENTRY pentry = &pentHmgr[Index];
 
    if (!GdiIsHandleValid(hobj))
    {
        return NULL;
    }
 
    return pentry->pUser;
}

Referenced by CancelDC(), CreateCompatibleBitmap(), CreateCompatibleDC(), CreatePen(), GdiDeleteBrushOrPen(), GetBrushOrgEx(), GetColorSpace(), IntCreateDICW(), SetBrushOrgEx(), SetDIBitsToDevice(), START_TEST(), and StretchDIBits().

GdiIsHandleValid()

BOOL GdiIsHandleValid

(

_In_ HGDIOBJ

hobj

)

Definition at line 29 of file gditools.c.

{
    PENTRY pentHmgr = GdiQueryTable();
    USHORT Index = (ULONG_PTR)hobj & 0xFFFF;
    PENTRY pentry = &pentHmgr[Index];
 
    if ((pentry->einfo.pobj == NULL) ||
        ((LONG_PTR)pentry->einfo.pobj > 0) ||
        (pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16)))
    {
        return FALSE;
    }
 
    return TRUE;
}

Referenced by GdiGetHandleUserData(), and START_TEST().

GdiIsHandleValidEx()

BOOL GdiIsHandleValidEx	(	_In_ HGDIOBJ	hobj,
		_In_ GDILOOBJTYPE	ObjectType
	)

Definition at line 47 of file gditools.c.

{
    PENTRY pentHmgr = GdiQueryTable();
    USHORT Index = (ULONG_PTR)hobj & 0xFFFF;
    PENTRY pentry = &pentHmgr[Index];
 
    if ((pentry->einfo.pobj == NULL) ||
        ((LONG_PTR)pentry->einfo.pobj > 0) ||
        (pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16)) ||
        (pentry->Objt != (UCHAR)(ObjectType >> 16)) ||
        (pentry->Flags != (UCHAR)(ObjectType >> 24)))
    {
        return FALSE;
    }
 
    return TRUE;
}

GdiQueryTable()

PENTRY GdiQueryTable

(

VOID

)

Definition at line 20 of file gditools.c.

{
    PTEB pTeb = NtCurrentTeb();
    PPEB pPeb = pTeb->ProcessEnvironmentBlock;
    return pPeb->GdiSharedHandleTable;
}

Referenced by GdiGetHandleUserData(), GdiIsHandleValid(), and GdiIsHandleValidEx().