mirror of
https://github.com/reactos/reactos.git
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83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
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/* SDK/DDK/NDK Headers. */
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#define WIN32_NO_STATUS
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#include <windef.h>
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#include <winbase.h>
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#include <wingdi.h>
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#include <winddi.h>
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#include <prntfont.h>
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#define NTOS_MODE_USER
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#include <ndk/ntndk.h>
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/* Public Win32K Headers */
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#include <ntgdityp.h>
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#include <ntgdi.h>
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#include <ntgdihdl.h>
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PENTRY
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GdiQueryTable(
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VOID)
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{
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PTEB pTeb = NtCurrentTeb();
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PPEB pPeb = pTeb->ProcessEnvironmentBlock;
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return pPeb->GdiSharedHandleTable;
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}
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BOOL
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GdiIsHandleValid(
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_In_ HGDIOBJ hobj)
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{
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PENTRY pentHmgr = GdiQueryTable();
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USHORT Index = (ULONG_PTR)hobj & 0xFFFF;
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PENTRY pentry = &pentHmgr[Index];
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if ((pentry->einfo.pobj == NULL) ||
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((LONG_PTR)pentry->einfo.pobj > 0) ||
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(pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16)))
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{
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return FALSE;
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}
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return TRUE;
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}
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BOOL
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GdiIsHandleValidEx(
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_In_ HGDIOBJ hobj,
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_In_ GDILOOBJTYPE ObjectType)
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{
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PENTRY pentHmgr = GdiQueryTable();
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USHORT Index = (ULONG_PTR)hobj & 0xFFFF;
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PENTRY pentry = &pentHmgr[Index];
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if ((pentry->einfo.pobj == NULL) ||
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((LONG_PTR)pentry->einfo.pobj > 0) ||
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(pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16)) ||
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(pentry->Objt != (UCHAR)(ObjectType >> 16)) ||
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(pentry->Flags != (UCHAR)(ObjectType >> 24)))
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{
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return FALSE;
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}
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return TRUE;
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}
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PVOID
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GdiGetHandleUserData(
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_In_ HGDIOBJ hobj)
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{
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PENTRY pentHmgr = GdiQueryTable();
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USHORT Index = (ULONG_PTR)hobj;
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PENTRY pentry = &pentHmgr[Index];
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if (!GdiIsHandleValid(hobj))
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{
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return NULL;
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}
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return pentry->pUser;
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}
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