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reactos/win32ss/gdi/ntgdi/gdiobj.c
James Tabor 72f115d6ed [NtGDI] Set owner after changing object type.
2021-09-27 23:49:35 -05:00

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/*
* PROJECT: ReactOS win32 kernel mode subsystem
* LICENSE: GPL - See COPYING in the top level directory
* FILE: win32ss/gdi/ntgdi/gdiobj.c
* PURPOSE: General GDI object manipulation routines
* PROGRAMMERS: Timo Kreuzer
*/
/*
* If you want to understand this code, you need to start thinking in portals.
* - gpaulRefCount is a global pointer to an allocated array of ULONG values,
* one for each handle. Bits 0 - 22 contain a reference count for the handle.
* It gets increased for each handle lock / reference. Bit 23 contains a valid
* bit. If this bit is 0, the handle got deleted and will be pushed to the free
* list, once all references are gone. Bits 24 - 31 contain the reuse value of
* the handle, which allows to check if the entry was changed before atomically
* exchanging the reference count.
* - Objects can exist with or without a handle
* - Objects with a handle can be locked either exclusively or shared.
* Both locks increase the handle reference count in gpaulRefCount.
* Exclusive locks also increase the BASEOBJECT's cExclusiveLock field
* and the first lock (can be acquired recursively) acquires a pushlock
* that is also stored in the BASEOBJECT.
* - Objects without a handle cannot have exclusive locks. Their reference
* count is tracked in the BASEOBJECT's ulShareCount field.
* - An object that is inserted in the handle table automatically has an
* exclusive lock. For objects that are "shared objects" (BRUSH, PALETTE, ...)
* this is the only way it can ever be exclusively locked. It prevents the
* object from being locked by another thread. A shared lock will simply fail,
* while an exclusive lock will succeed after the object was unlocked.
*
* Ownership:
*
* Owner: POWNED PUBLIC NONE spec
* ---------------------------------------------------
* LockForRead + + - PUBLIC
* LockForWrite + - - POWNED
* LockAny + + + NONE
* NtGdiDeleteObjectApp + - - PUBLIC
* GreDeleteObject + + + NONE
* GreSetOwner(POWNED) - - + -
* GreSetOwner(PUBLIC) + - + -
* GreSetOwner(NONE) + - - -
*
*/
/* INCLUDES ******************************************************************/
#include <win32k.h>
#define NDEBUG
#include <debug.h>
FORCEINLINE
ULONG
InterlockedReadUlong(
_In_ _Interlocked_operand_ ULONG volatile *Source)
{
return *Source;
}
FORCEINLINE
void
INCREASE_THREAD_LOCK_COUNT(
_In_ HANDLE hobj)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
DBG_UNREFERENCED_PARAMETER(hobj);
if (pti)
{
#if DBG
pti->acExclusiveLockCount[((ULONG_PTR)hobj >> 16) & 0x1f]++;
#endif
pti->cExclusiveLocks++;
}
}
FORCEINLINE
void
DECREASE_THREAD_LOCK_COUNT(
_In_ HANDLE hobj)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
DBG_UNREFERENCED_PARAMETER(hobj);
if (pti)
{
#if DBG
pti->acExclusiveLockCount[((ULONG_PTR)hobj >> 16) & 0x1f]--;
#endif
pti->cExclusiveLocks--;
}
}
#if DBG
VOID
ASSERT_LOCK_ORDER(
_In_ UCHAR objt)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
ULONG i;
if (pti)
{
/* Ensure correct locking order! */
for (i = objt + 1; i < GDIObjTypeTotal; i++)
{
NT_ASSERT(pti->acExclusiveLockCount[i] == 0);
}
}
}
#define ASSERT_SHARED_OBJECT_TYPE(objt) \
ASSERT((objt) == GDIObjType_SURF_TYPE || \
(objt) == GDIObjType_PAL_TYPE || \
(objt) == GDIObjType_LFONT_TYPE || \
(objt) == GDIObjType_PATH_TYPE || \
(objt) == GDIObjType_BRUSH_TYPE)
#define ASSERT_EXCLUSIVE_OBJECT_TYPE(objt) \
ASSERT((objt) == GDIObjType_DC_TYPE || \
(objt) == GDIObjType_RGN_TYPE || \
(objt) == GDIObjType_UMPD_TYPE || \
(objt) == GDIObjType_META_TYPE)
#define ASSERT_TRYLOCK_OBJECT_TYPE(objt) \
ASSERT((objt) == GDIObjType_DRVOBJ_TYPE)
#else
#define ASSERT_LOCK_ORDER(hobj)
#define ASSERT_SHARED_OBJECT_TYPE(objt)
#define ASSERT_EXCLUSIVE_OBJECT_TYPE(objt)
#define ASSERT_TRYLOCK_OBJECT_TYPE(objt)
#endif
#if defined(_M_IX86) || defined(_M_AMD64)
#define InterlockedOr16 _InterlockedOr16
#endif
#define GDIOBJ_POOL_TAG(type) ('00hG' + (((type) & 0x1f) << 24))
enum
{
REF_MASK_REUSE = 0xff000000,
REF_INC_REUSE = 0x01000000,
REF_MASK_VALID = 0x00800000,
REF_MASK_COUNT = 0x007fffff,
REF_MASK_INUSE = 0x00ffffff,
};
/* GLOBALS *******************************************************************/
/* Per session handle table globals */
static PVOID gpvGdiHdlTblSection = NULL;
PENTRY gpentHmgr;
PULONG gpaulRefCount;
volatile ULONG gulFirstFree;
volatile ULONG gulFirstUnused;
static PPAGED_LOOKASIDE_LIST gpaLookasideList;
static VOID NTAPI GDIOBJ_vCleanup(PVOID ObjectBody);
static const
GDICLEANUPPROC
apfnCleanup[] =
{
NULL, /* 00 GDIObjType_DEF_TYPE */
DC_vCleanup, /* 01 GDIObjType_DC_TYPE */
NULL, /* 02 GDIObjType_UNUSED1_TYPE */
NULL, /* 03 GDIObjType_UNUSED2_TYPE */
REGION_vCleanup, /* 04 GDIObjType_RGN_TYPE */
SURFACE_vCleanup, /* 05 GDIObjType_SURF_TYPE */
GDIOBJ_vCleanup, /* 06 GDIObjType_CLIENTOBJ_TYPE */
GDIOBJ_vCleanup, /* 07 GDIObjType_PATH_TYPE */
PALETTE_vCleanup, /* 08 GDIObjType_PAL_TYPE */
GDIOBJ_vCleanup, /* 09 GDIObjType_ICMLCS_TYPE */
GDIOBJ_vCleanup, /* 0a GDIObjType_LFONT_TYPE */
NULL, /* 0b GDIObjType_RFONT_TYPE, unused */
NULL, /* 0c GDIObjType_PFE_TYPE, unused */
NULL, /* 0d GDIObjType_PFT_TYPE, unused */
GDIOBJ_vCleanup, /* 0e GDIObjType_ICMCXF_TYPE */
NULL, /* 0f GDIObjType_SPRITE_TYPE, unused */
NULL, /* 10 GDIObjType_BRUSH_TYPE, BRUSH, PEN, EXTPEN */
NULL, /* 11 GDIObjType_UMPD_TYPE, unused */
NULL, /* 12 GDIObjType_UNUSED4_TYPE */
NULL, /* 13 GDIObjType_SPACE_TYPE, unused */
NULL, /* 14 GDIObjType_UNUSED5_TYPE */
GDIOBJ_vCleanup, /* 15 GDIObjType_META_TYPE */
NULL, /* 16 GDIObjType_EFSTATE_TYPE, unused */
NULL, /* 17 GDIObjType_BMFD_TYPE, unused */
NULL, /* 18 GDIObjType_VTFD_TYPE, unused */
NULL, /* 19 GDIObjType_TTFD_TYPE, unused */
NULL, /* 1a GDIObjType_RC_TYPE, unused */
NULL, /* 1b GDIObjType_TEMP_TYPE, unused */
DRIVEROBJ_vCleanup,/* 1c GDIObjType_DRVOBJ_TYPE */
NULL, /* 1d GDIObjType_DCIOBJ_TYPE, unused */
NULL, /* 1e GDIObjType_SPOOL_TYPE, unused */
NULL, /* 1f reserved entry */
};
static const
GDIOBJDELETEPROC
apfnDelete[] =
{
NULL, /* 00 GDIObjType_DEF_TYPE */
NULL, /* 01 GDIObjType_DC_TYPE */
NULL, /* 02 GDIObjType_UNUSED1_TYPE */
NULL, /* 03 GDIObjType_UNUSED2_TYPE */
NULL, /* 04 GDIObjType_RGN_TYPE */
NULL, /* 05 GDIObjType_SURF_TYPE */
NULL, /* 06 GDIObjType_CLIENTOBJ_TYPE */
NULL, /* 07 GDIObjType_PATH_TYPE */
NULL, /* 08 GDIObjType_PAL_TYPE */
NULL, /* 09 GDIObjType_ICMLCS_TYPE */
NULL, /* 0a GDIObjType_LFONT_TYPE */
NULL, /* 0b GDIObjType_RFONT_TYPE, unused */
NULL, /* 0c GDIObjType_PFE_TYPE, unused */
NULL, /* 0d GDIObjType_PFT_TYPE, unused */
NULL, /* 0e GDIObjType_ICMCXF_TYPE */
NULL, /* 0f GDIObjType_SPRITE_TYPE, unused */
BRUSH_vDeleteObject, /* 10 GDIObjType_BRUSH_TYPE, BRUSH, PEN, EXTPEN */
NULL, /* 11 GDIObjType_UMPD_TYPE, unused */
NULL, /* 12 GDIObjType_UNUSED4_TYPE */
NULL, /* 13 GDIObjType_SPACE_TYPE, unused */
NULL, /* 14 GDIObjType_UNUSED5_TYPE */
NULL, /* 15 GDIObjType_META_TYPE, unused */
NULL, /* 16 GDIObjType_EFSTATE_TYPE, unused */
NULL, /* 17 GDIObjType_BMFD_TYPE, unused */
NULL, /* 18 GDIObjType_VTFD_TYPE, unused */
NULL, /* 19 GDIObjType_TTFD_TYPE, unused */
NULL, /* 1a GDIObjType_RC_TYPE, unused */
NULL, /* 1b GDIObjType_TEMP_TYPE, unused */
NULL, /* 1c GDIObjType_DRVOBJ_TYPE */
NULL, /* 1d GDIObjType_DCIOBJ_TYPE, unused */
NULL, /* 1e GDIObjType_SPOOL_TYPE, unused */
NULL, /* 1f reserved entry */
};
/* INTERNAL FUNCTIONS ********************************************************/
static
VOID
NTAPI
GDIOBJ_vCleanup(PVOID ObjectBody)
{
/* Nothing to do */
}
static
VOID
InitLookasideList(UCHAR objt, ULONG cjSize)
{
ExInitializePagedLookasideList(&gpaLookasideList[objt],
NULL,
NULL,
0,
cjSize,
GDITAG_HMGR_LOOKASIDE_START + (objt << 24),
0);
}
CODE_SEG("INIT")
NTSTATUS
NTAPI
InitGdiHandleTable(void)
{
NTSTATUS status;
LARGE_INTEGER liSize;
PVOID pvSection;
SIZE_T cjViewSize = 0;
/* Create a section for the shared handle table */
liSize.QuadPart = sizeof(GDI_HANDLE_TABLE); // GDI_HANDLE_COUNT * sizeof(ENTRY);
status = MmCreateSection(&gpvGdiHdlTblSection,
SECTION_ALL_ACCESS,
NULL,
&liSize,
PAGE_READWRITE,
SEC_COMMIT | 0x1,
NULL,
NULL);
if (!NT_SUCCESS(status))
{
DPRINT1("INITGDI: Could not allocate a GDI handle table.\n");
return status;
}
/* Map the section in session space */
status = MmMapViewInSessionSpace(gpvGdiHdlTblSection,
(PVOID*)&gpentHmgr,
&cjViewSize);
if (!NT_SUCCESS(status))
{
DPRINT1("INITGDI: Failed to map handle table section\n");
ObDereferenceObject(gpvGdiHdlTblSection);
return status;
}
/* Allocate memory for the reference counter table */
gpaulRefCount = EngAllocSectionMem(&pvSection,
FL_ZERO_MEMORY,
GDI_HANDLE_COUNT * sizeof(ULONG),
'frHG');
if (!gpaulRefCount)
{
DPRINT1("INITGDI: Failed to allocate reference table.\n");
ObDereferenceObject(gpvGdiHdlTblSection);
return STATUS_INSUFFICIENT_RESOURCES;
}
gulFirstFree = 0;
gulFirstUnused = RESERVE_ENTRIES_COUNT;
GdiHandleTable = (PVOID)gpentHmgr;
/* Initialize the lookaside lists */
gpaLookasideList = ExAllocatePoolWithTag(NonPagedPool,
GDIObjTypeTotal * sizeof(PAGED_LOOKASIDE_LIST),
TAG_GDIHNDTBLE);
if(!gpaLookasideList)
return STATUS_NO_MEMORY;
InitLookasideList(GDIObjType_DC_TYPE, sizeof(DC));
InitLookasideList(GDIObjType_RGN_TYPE, sizeof(REGION));
InitLookasideList(GDIObjType_SURF_TYPE, sizeof(SURFACE));
InitLookasideList(GDIObjType_CLIENTOBJ_TYPE, sizeof(CLIENTOBJ));
InitLookasideList(GDIObjType_PATH_TYPE, sizeof(PATH));
InitLookasideList(GDIObjType_PAL_TYPE, sizeof(PALETTE));
InitLookasideList(GDIObjType_ICMLCS_TYPE, sizeof(COLORSPACE));
InitLookasideList(GDIObjType_LFONT_TYPE, sizeof(TEXTOBJ));
InitLookasideList(GDIObjType_BRUSH_TYPE, sizeof(BRUSH));
return STATUS_SUCCESS;
}
FORCEINLINE
VOID
IncrementCurrentProcessGdiHandleCount(void)
{
PPROCESSINFO ppi = PsGetCurrentProcessWin32Process();
if (ppi) InterlockedIncrement((LONG*)&ppi->GDIHandleCount);
}
FORCEINLINE
VOID
DecrementCurrentProcessGdiHandleCount(void)
{
PPROCESSINFO ppi = PsGetCurrentProcessWin32Process();
if (ppi) InterlockedDecrement((LONG*)&ppi->GDIHandleCount);
}
static inline
VOID
IncrementGdiHandleCount(ULONG ulProcessId)
{
PEPROCESS pep;
PPROCESSINFO ppi;
NTSTATUS Status;
Status = PsLookupProcessByProcessId(ULongToHandle(ulProcessId), &pep);
NT_ASSERT(NT_SUCCESS(Status));
__analysis_assume(NT_SUCCESS(Status));
ppi = PsGetProcessWin32Process(pep);
if (ppi) InterlockedIncrement((LONG*)&ppi->GDIHandleCount);
if (NT_SUCCESS(Status)) ObDereferenceObject(pep);
}
static inline
VOID
DecrementGdiHandleCount(ULONG ulProcessId)
{
PEPROCESS pep;
PPROCESSINFO ppi;
NTSTATUS Status;
Status = PsLookupProcessByProcessId(ULongToHandle(ulProcessId), &pep);
NT_ASSERT(NT_SUCCESS(Status));
__analysis_assume(NT_SUCCESS(Status));
ppi = PsGetProcessWin32Process(pep);
if (ppi) InterlockedDecrement((LONG*)&ppi->GDIHandleCount);
if (NT_SUCCESS(Status)) ObDereferenceObject(pep);
}
static
PENTRY
ENTRY_pentPopFreeEntry(VOID)
{
ULONG iFirst, iNext, iPrev;
PENTRY pentFree;
DPRINT("Enter InterLockedPopFreeEntry\n");
do
{
/* Get the index and sequence number of the first free entry */
iFirst = InterlockedReadUlong(&gulFirstFree);
/* Check if we have a free entry */
if (!(iFirst & GDI_HANDLE_INDEX_MASK))
{
/* Increment FirstUnused and get the new index */
iFirst = InterlockedIncrement((LONG*)&gulFirstUnused) - 1;
/* Check if we have unused entries left */
if (iFirst >= GDI_HANDLE_COUNT)
{
DPRINT1("No more GDI handles left!\n");
#if DBG_ENABLE_GDIOBJ_BACKTRACES
DbgDumpGdiHandleTableWithBT();
#endif
InterlockedDecrement((LONG*)&gulFirstUnused);
return 0;
}
/* Return the old entry */
return &gpentHmgr[iFirst];
}
/* Get a pointer to the first free entry */
pentFree = &gpentHmgr[iFirst & GDI_HANDLE_INDEX_MASK];
/* Create a new value with an increased sequence number */
iNext = GDI_HANDLE_GET_INDEX(pentFree->einfo.hFree);
iNext |= (iFirst & ~GDI_HANDLE_INDEX_MASK) + 0x10000;
/* Try to exchange the FirstFree value */
iPrev = InterlockedCompareExchange((LONG*)&gulFirstFree,
iNext,
iFirst);
}
while (iPrev != iFirst);
/* Sanity check: is entry really free? */
ASSERT(((ULONG_PTR)pentFree->einfo.pobj & ~GDI_HANDLE_INDEX_MASK) == 0);
return pentFree;
}
/* Pushes an entry of the handle table to the free list,
The entry must not have any references left */
static
VOID
ENTRY_vPushFreeEntry(PENTRY pentFree)
{
ULONG iToFree, iFirst, iPrev, idxToFree;
DPRINT("Enter ENTRY_vPushFreeEntry\n");
idxToFree = pentFree - gpentHmgr;
ASSERT((gpaulRefCount[idxToFree] & REF_MASK_INUSE) == 0);
/* Initialize entry */
pentFree->Objt = GDIObjType_DEF_TYPE;
pentFree->ObjectOwner.ulObj = 0;
pentFree->pUser = NULL;
/* Increase reuse counter in entry and reference counter */
InterlockedExchangeAdd((LONG*)&gpaulRefCount[idxToFree], REF_INC_REUSE);
pentFree->FullUnique += 0x0100;
do
{
/* Get the current first free index and sequence number */
iFirst = InterlockedReadUlong(&gulFirstFree);
/* Set the einfo.pobj member to the index of the first free entry */
pentFree->einfo.pobj = UlongToPtr(iFirst & GDI_HANDLE_INDEX_MASK);
/* Combine new index and increased sequence number in iToFree */
iToFree = idxToFree | ((iFirst & ~GDI_HANDLE_INDEX_MASK) + 0x10000);
/* Try to atomically update the first free entry */
iPrev = InterlockedCompareExchange((LONG*)&gulFirstFree,
iToFree,
iFirst);
}
while (iPrev != iFirst);
}
static
PENTRY
ENTRY_ReferenceEntryByHandle(HGDIOBJ hobj, FLONG fl)
{
ULONG ulIndex, cNewRefs, cOldRefs;
PENTRY pentry;
/* Get the handle index and check if its too big */
ulIndex = GDI_HANDLE_GET_INDEX(hobj);
/* Get pointer to the entry */
pentry = &gpentHmgr[ulIndex];
/* Get the current reference count */
cOldRefs = gpaulRefCount[ulIndex];
do
{
/* Check if the slot is deleted */
if ((cOldRefs & REF_MASK_VALID) == 0)
{
DPRINT("GDIOBJ: Slot is not valid: 0x%lx, hobh=%p\n", cOldRefs, hobj);
return NULL;
}
/* Check if the unique value matches */
if (pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16))
{
DPRINT("GDIOBJ: Wrong unique value. Handle: 0x%4x, entry: 0x%4x\n",
(USHORT)((ULONG_PTR)hobj >> 16), pentry->FullUnique);
return NULL;
}
/* Check if the object owner is this process or public */
if (!(fl & GDIOBJFLAG_IGNOREPID) &&
pentry->ObjectOwner.ulObj != GDI_OBJ_HMGR_PUBLIC &&
pentry->ObjectOwner.ulObj != PtrToUlong(PsGetCurrentProcessId()))
{
DPRINT("GDIOBJ: Cannot reference foreign handle %p, pentry=%p:%lx.\n",
hobj, pentry, pentry->ObjectOwner.ulObj);
return NULL;
}
/* Try to atomically increment the reference count */
cNewRefs = cOldRefs + 1;
cOldRefs = InterlockedCompareExchange((PLONG)&gpaulRefCount[ulIndex],
cNewRefs,
cOldRefs);
}
while (cNewRefs != cOldRefs + 1);
/* Integrity checks */
ASSERT((pentry->FullUnique & 0x1f) == pentry->Objt);
ASSERT(pentry->einfo.pobj != NULL);
/* Check if lower 32 bits match, the upper 32 bits are ignored */
ASSERT(pentry->einfo.pobj->hHmgr == UlongToPtr(PtrToUlong(hobj)));
return pentry;
}
static
HGDIOBJ
ENTRY_hInsertObject(PENTRY pentry, POBJ pobj, UCHAR objt, ULONG ulOwner)
{
ULONG ulIndex;
/* Calculate the handle index */
ulIndex = pentry - gpentHmgr;
/* Update the fields in the ENTRY */
pentry->einfo.pobj = pobj;
pentry->Objt = objt & 0x1f;
pentry->FullUnique = (pentry->FullUnique & 0xff00) | objt;
pentry->ObjectOwner.ulObj = ulOwner;
/* Make the handle valid with 1 reference */
ASSERT((gpaulRefCount[ulIndex] & REF_MASK_INUSE) == 0);
InterlockedOr((LONG*)&gpaulRefCount[ulIndex], REF_MASK_VALID | 1);
/* Return the handle */
return (HGDIOBJ)(((ULONG_PTR)pentry->FullUnique << 16) | ulIndex);
}
POBJ
NTAPI
GDIOBJ_AllocateObject(UCHAR objt, ULONG cjSize, FLONG fl)
{
POBJ pobj;
if (fl & BASEFLAG_LOOKASIDE)
{
/* Allocate the object from a lookaside list */
pobj = ExAllocateFromPagedLookasideList(&gpaLookasideList[objt & 0x1f]);
}
else
{
/* Allocate the object from paged pool */
pobj = ExAllocatePoolWithTag(PagedPool, cjSize, GDIOBJ_POOL_TAG(objt));
}
if (!pobj) return NULL;
/* Initialize the object */
RtlZeroMemory(pobj, cjSize);
pobj->hHmgr = (HGDIOBJ)((ULONG_PTR)objt << 16);
pobj->cExclusiveLock = 0;
pobj->ulShareCount = 1;
pobj->BaseFlags = fl & 0xffff;
DBG_INITLOG(&pobj->slhLog);
DBG_LOGEVENT(&pobj->slhLog, EVENT_ALLOCATE, 0);
#if DBG_ENABLE_GDIOBJ_BACKTRACES
DbgCaptureStackBackTace(pobj->apvBackTrace, 1, GDI_OBJECT_STACK_LEVELS);
#endif /* GDI_DEBUG */
return pobj;
}
VOID
NTAPI
GDIOBJ_vFreeObject(POBJ pobj)
{
UCHAR objt;
DBG_CLEANUP_EVENT_LIST(&pobj->slhLog);
/* Get the object type */
objt = ((ULONG_PTR)pobj->hHmgr >> 16) & 0x1f;
/* Check if we have a delete procedure (for C++ based objects) */
if (apfnDelete[objt] != NULL)
{
/* Invoke the delete procedure */
apfnDelete[objt](pobj);
}
else
{
/* Call the cleanup procedure */
NT_ASSERT(apfnCleanup[objt]);
apfnCleanup[objt](pobj);
/* Check if the object is allocated from a lookaside list */
if (pobj->BaseFlags & BASEFLAG_LOOKASIDE)
{
ExFreeToPagedLookasideList(&gpaLookasideList[objt], pobj);
}
else
{
ExFreePoolWithTag(pobj, GDIOBJ_POOL_TAG(objt));
}
}
}
VOID
NTAPI
GDIOBJ_vDereferenceObject(POBJ pobj)
{
ULONG cRefs, ulIndex;
/* Calculate the index */
ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
/* Check if the object has a handle */
if (ulIndex)
{
/* Decrement reference count */
if ((gpaulRefCount[ulIndex] & REF_MASK_COUNT) == 0)
{
DBG_DUMP_EVENT_LIST(&pobj->slhLog);
}
ASSERT((gpaulRefCount[ulIndex] & REF_MASK_COUNT) > 0);
cRefs = InterlockedDecrement((LONG*)&gpaulRefCount[ulIndex]);
DBG_LOGEVENT(&pobj->slhLog, EVENT_DEREFERENCE, cRefs);
/* Check if we reached 0 and handle bit is not set */
if ((cRefs & REF_MASK_INUSE) == 0)
{
/* Make sure it's ok to delete the object */
ASSERT(pobj->BaseFlags & BASEFLAG_READY_TO_DIE);
/* Check if the handle was process owned */
if (gpentHmgr[ulIndex].ObjectOwner.ulObj != GDI_OBJ_HMGR_PUBLIC &&
gpentHmgr[ulIndex].ObjectOwner.ulObj != GDI_OBJ_HMGR_NONE)
{
/* Decrement the process handle count */
ASSERT(gpentHmgr[ulIndex].ObjectOwner.ulObj ==
HandleToUlong(PsGetCurrentProcessId()));
DecrementCurrentProcessGdiHandleCount();
}
/* Push entry to the free list */
ENTRY_vPushFreeEntry(&gpentHmgr[ulIndex]);
/* Free the object */
GDIOBJ_vFreeObject(pobj);
}
}
else
{
/* Decrement the objects reference count */
ASSERT(pobj->ulShareCount > 0);
cRefs = InterlockedDecrement((LONG*)&pobj->ulShareCount);
DBG_LOGEVENT(&pobj->slhLog, EVENT_DEREFERENCE, cRefs);
/* Check if we reached 0 */
if (cRefs == 0)
{
/* Free the object */
GDIOBJ_vFreeObject(pobj);
}
}
}
POBJ
NTAPI
GDIOBJ_ReferenceObjectByHandle(
HGDIOBJ hobj,
UCHAR objt)
{
PENTRY pentry;
POBJ pobj;
/* Check if the handle type matches */
ASSERT_SHARED_OBJECT_TYPE(objt);
if ((((ULONG_PTR)hobj >> 16) & 0x1f) != objt)
{
DPRINT("GDIOBJ: Wrong type. handle=%p, type=%x\n", hobj, objt);
return NULL;
}
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(hobj, 0);
if (!pentry)
{
DPRINT("GDIOBJ: Requested handle 0x%p is not valid.\n", hobj);
return NULL;
}
/* Get the pointer to the BASEOBJECT */
pobj = pentry->einfo.pobj;
/* Check if the object is exclusively locked */
if (pobj->cExclusiveLock != 0)
{
DPRINT1("GDIOBJ: Cannot reference object %p with exclusive lock.\n", hobj);
GDIOBJ_vDereferenceObject(pobj);
DBG_DUMP_EVENT_LIST(&pobj->slhLog);
return NULL;
}
DBG_LOGEVENT(&pobj->slhLog, EVENT_REFERENCE, gpaulRefCount[pentry - gpentHmgr]);
/* All is well, return the object */
return pobj;
}
VOID
NTAPI
GDIOBJ_vReferenceObjectByPointer(POBJ pobj)
{
ULONG cRefs;
/* Check if the object has a handle */
if (GDI_HANDLE_GET_INDEX(pobj->hHmgr))
{
/* Increase the handle's reference count */
ULONG ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
ASSERT((gpaulRefCount[ulIndex] & REF_MASK_COUNT) > 0);
cRefs = InterlockedIncrement((LONG*)&gpaulRefCount[ulIndex]);
}
else
{
/* Increase the object's reference count */
cRefs = InterlockedIncrement((LONG*)&pobj->ulShareCount);
}
DBG_LOGEVENT(&pobj->slhLog, EVENT_REFERENCE, cRefs);
}
PGDIOBJ
NTAPI
GDIOBJ_TryLockObject(
HGDIOBJ hobj,
UCHAR objt)
{
PENTRY pentry;
POBJ pobj;
DWORD dwThreadId;
/* Check if the handle type matches */
ASSERT_TRYLOCK_OBJECT_TYPE(objt);
if ((((ULONG_PTR)hobj >> 16) & 0x1f) != objt)
{
DPRINT("Wrong object type: hobj=0x%p, objt=0x%x\n", hobj, objt);
return NULL;
}
/* Make sure lock order is correct */
ASSERT_LOCK_ORDER(objt);
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(hobj, 0);
if (!pentry)
{
DPRINT("GDIOBJ: Requested handle 0x%p is not valid.\n", hobj);
return NULL;
}
/* Get the pointer to the BASEOBJECT */
pobj = pentry->einfo.pobj;
/* Check if we already own the lock */
dwThreadId = PtrToUlong(PsGetCurrentThreadId());
if (pobj->dwThreadId != dwThreadId)
{
/* Disable APCs and try acquiring the push lock */
KeEnterCriticalRegion();
if(!ExTryAcquirePushLockExclusive(&pobj->pushlock))
{
ULONG cRefs, ulIndex;
/* Already owned. Clean up and leave. */
KeLeaveCriticalRegion();
/* Calculate the index */
ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
/* Decrement reference count */
ASSERT((gpaulRefCount[ulIndex] & REF_MASK_COUNT) > 0);
cRefs = InterlockedDecrement((LONG*)&gpaulRefCount[ulIndex]);
ASSERT(cRefs & REF_MASK_VALID);
return NULL;
}
/* Set us as lock owner */
ASSERT(pobj->dwThreadId == 0);
pobj->dwThreadId = dwThreadId;
}
/* Increase lock count */
pobj->cExclusiveLock++;
INCREASE_THREAD_LOCK_COUNT(hobj);
DBG_LOGEVENT(&pobj->slhLog, EVENT_LOCK, 0);
/* Return the object */
return pobj;
}
PGDIOBJ
NTAPI
GDIOBJ_LockObject(
HGDIOBJ hobj,
UCHAR objt)
{
PENTRY pentry;
POBJ pobj;
DWORD dwThreadId;
/* Check if the handle type matches */
ASSERT_EXCLUSIVE_OBJECT_TYPE(objt);
if ((((ULONG_PTR)hobj >> 16) & 0x1f) != objt)
{
DPRINT("Wrong object type: hobj=0x%p, objt=0x%x\n", hobj, objt);
return NULL;
}
/* Make sure lock order is correct */
ASSERT_LOCK_ORDER(objt);
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(hobj, 0);
if (!pentry)
{
DPRINT("GDIOBJ: Requested handle 0x%p is not valid.\n", hobj);
return NULL;
}
/* Get the pointer to the BASEOBJECT */
pobj = pentry->einfo.pobj;
/* Check if we already own the lock */
dwThreadId = PtrToUlong(PsGetCurrentThreadId());
if (pobj->dwThreadId != dwThreadId)
{
/* Disable APCs and acquire the push lock */
KeEnterCriticalRegion();
ExAcquirePushLockExclusive(&pobj->pushlock);
/* Set us as lock owner */
ASSERT(pobj->dwThreadId == 0);
pobj->dwThreadId = dwThreadId;
}
/* Increase lock count */
pobj->cExclusiveLock++;
INCREASE_THREAD_LOCK_COUNT(hobj);
DBG_LOGEVENT(&pobj->slhLog, EVENT_LOCK, 0);
/* Return the object */
return pobj;
}
VOID
NTAPI
GDIOBJ_vUnlockObject(POBJ pobj)
{
ULONG cRefs, ulIndex;
ASSERT(pobj->cExclusiveLock > 0);
/* Decrease lock count */
pobj->cExclusiveLock--;
DECREASE_THREAD_LOCK_COUNT(pobj->hHmgr);
DBG_LOGEVENT(&pobj->slhLog, EVENT_UNLOCK, 0);
/* Check if this was the last lock */
if (pobj->cExclusiveLock == 0)
{
/* Reset lock owner */
pobj->dwThreadId = 0;
/* Release the pushlock and reenable APCs */
ExReleasePushLockExclusive(&pobj->pushlock);
KeLeaveCriticalRegion();
}
/* Calculate the index */
ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
/* Decrement reference count */
ASSERT((gpaulRefCount[ulIndex] & REF_MASK_COUNT) > 0);
cRefs = InterlockedDecrement((LONG*)&gpaulRefCount[ulIndex]);
ASSERT(cRefs & REF_MASK_VALID);
}
HGDIOBJ
NTAPI
GDIOBJ_hInsertObject(
POBJ pobj,
ULONG ulOwner)
{
PENTRY pentry;
UCHAR objt;
/* Must have no handle and only one reference */
ASSERT(GDI_HANDLE_GET_INDEX(pobj->hHmgr) == 0);
ASSERT(pobj->cExclusiveLock == 0);
ASSERT(pobj->ulShareCount == 1);
/* Get a free handle entry */
pentry = ENTRY_pentPopFreeEntry();
if (!pentry)
{
DPRINT1("GDIOBJ: Could not get a free entry.\n");
return NULL;
}
/* Make the object exclusively locked */
ExInitializePushLock(&pobj->pushlock);
KeEnterCriticalRegion();
ExAcquirePushLockExclusive(&pobj->pushlock);
pobj->cExclusiveLock = 1;
pobj->dwThreadId = PtrToUlong(PsGetCurrentThreadId());
INCREASE_THREAD_LOCK_COUNT(pobj->hHmgr);
/* Get object type from the hHmgr field */
objt = ((ULONG_PTR)pobj->hHmgr >> 16) & 0xff;
ASSERT(objt != GDIObjType_DEF_TYPE);
/* Check if current process is requested owner */
if (ulOwner == GDI_OBJ_HMGR_POWNED)
{
/* Increment the process handle count */
IncrementCurrentProcessGdiHandleCount();
/* Use Process id */
ulOwner = HandleToUlong(PsGetCurrentProcessId());
}
/* Insert the object into the handle table */
pobj->hHmgr = ENTRY_hInsertObject(pentry, pobj, objt, ulOwner);
/* Return the handle */
DPRINT("GDIOBJ: Created handle: %p\n", pobj->hHmgr);
DBG_LOGEVENT(&pobj->slhLog, EVENT_CREATE_HANDLE, 0);
return pobj->hHmgr;
}
VOID
NTAPI
GDIOBJ_vSetObjectOwner(
POBJ pobj,
ULONG ulNewOwner)
{
PENTRY pentry;
ULONG ulOldOwner;
/* This is a ugly HACK, needed to fix IntGdiSetDCOwnerEx */
if (GDI_HANDLE_IS_STOCKOBJ(pobj->hHmgr))
{
DPRINT("Trying to set ownership of stock object %p to %lx\n", pobj->hHmgr, ulNewOwner);
return;
}
/* Get the handle entry */
NT_ASSERT(GDI_HANDLE_GET_INDEX(pobj->hHmgr));
pentry = &gpentHmgr[GDI_HANDLE_GET_INDEX(pobj->hHmgr)];
/* Check if the new owner is the same as the old one */
ulOldOwner = pentry->ObjectOwner.ulObj;
if (ulOldOwner == ulNewOwner)
{
/* Nothing to do */
return;
}
/* Is the current process requested? */
if (ulNewOwner == GDI_OBJ_HMGR_POWNED)
{
/* Use process id */
ulNewOwner = HandleToUlong(PsGetCurrentProcessId());
}
// HACK
if (ulNewOwner == GDI_OBJ_HMGR_NONE)
ulNewOwner = GDI_OBJ_HMGR_PUBLIC;
/* Was the object process owned? */
if ((ulOldOwner != GDI_OBJ_HMGR_PUBLIC) &&
(ulOldOwner != GDI_OBJ_HMGR_NONE))
{
/* Decrement the previous owners handle count */
DecrementGdiHandleCount(ulOldOwner);
}
/* Is the new owner a process? */
if ((ulNewOwner != GDI_OBJ_HMGR_PUBLIC) &&
(ulNewOwner != GDI_OBJ_HMGR_NONE))
{
/* Increment the new owners handle count */
IncrementGdiHandleCount(ulNewOwner);
}
else
{
/* Make sure we don't leak user mode memory */
NT_ASSERT(pentry->pUser == NULL);
}
/* Set new owner */
pentry->ObjectOwner.ulObj = ulNewOwner;
DBG_LOGEVENT(&pobj->slhLog, EVENT_SET_OWNER, 0);
}
/* Locks 2 or 3 objects at a time */
BOOL
NTAPI
GDIOBJ_bLockMultipleObjects(
IN ULONG ulCount,
IN HGDIOBJ* ahObj,
OUT PGDIOBJ* apObj,
IN UCHAR objt)
{
UINT auiIndices[3] = {0, 1, 2};
UINT i, j, tmp;
ASSERT(ulCount <= 3);
/* Sort the handles */
for (i = 0; i < ulCount - 1; i++)
{
for (j = i + 1; j < ulCount; j++)
{
if ((ULONG_PTR)ahObj[auiIndices[i]] <
(ULONG_PTR)ahObj[auiIndices[j]])
{
tmp = auiIndices[i];
auiIndices[i] = auiIndices[j];
auiIndices[j] = tmp;
}
}
}
/* Lock the objects in safe order */
for (i = 0; i < ulCount; i++)
{
/* Skip NULL handles */
if (ahObj[auiIndices[i]] == NULL)
{
apObj[auiIndices[i]] = NULL;
continue;
}
/* Lock the object */
apObj[auiIndices[i]] = GDIOBJ_LockObject(ahObj[auiIndices[i]], objt);
/* Check for failure */
if (apObj[auiIndices[i]] == NULL)
{
/* Cleanup */
while (i--)
{
if (apObj[auiIndices[i]])
GDIOBJ_vUnlockObject(apObj[auiIndices[i]]);
}
return FALSE;
}
}
return TRUE;
}
PVOID
NTAPI
GDIOBJ_pvGetObjectAttr(POBJ pobj)
{
ULONG ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
return gpentHmgr[ulIndex].pUser;
}
VOID
NTAPI
GDIOBJ_vSetObjectAttr(POBJ pobj, PVOID pvObjAttr)
{
ULONG ulIndex;
ASSERT(pobj->hHmgr);
/* Get the handle index */
ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
/* Set pointer to the usermode attribute */
gpentHmgr[ulIndex].pUser = pvObjAttr;
}
VOID
NTAPI
GDIOBJ_vDeleteObject(POBJ pobj)
{
ULONG ulIndex;
/* Set the object's delete flag */
InterlockedOr16((SHORT*)&pobj->BaseFlags, BASEFLAG_READY_TO_DIE);
DBG_LOGEVENT(&pobj->slhLog, EVENT_DELETE, 0);
/* Get the handle index */
ulIndex = GDI_HANDLE_GET_INDEX(pobj->hHmgr);
if (ulIndex)
{
/* Reset the handle valid bit */
InterlockedAnd((LONG*)&gpaulRefCount[ulIndex], ~REF_MASK_VALID);
/* Check if the object is exclusively locked */
if (pobj->cExclusiveLock != 0)
{
/* Reset lock owner and lock count */
pobj->dwThreadId = 0;
pobj->cExclusiveLock = 0;
/* Release the pushlock and reenable APCs */
ExReleasePushLockExclusive(&pobj->pushlock);
KeLeaveCriticalRegion();
DECREASE_THREAD_LOCK_COUNT(pobj->hHmgr);
}
}
/* Dereference the object (will take care of deletion) */
GDIOBJ_vDereferenceObject(pobj);
}
BOOL
NTAPI
GreIsHandleValid(HGDIOBJ hobj)
{
PENTRY pentry;
pentry = ENTRY_ReferenceEntryByHandle(hobj, 0);
if (!pentry) return FALSE;
GDIOBJ_vDereferenceObject(pentry->einfo.pobj);
return TRUE;
}
BOOL
NTAPI
GreDeleteObject(HGDIOBJ hobj)
{
PENTRY pentry;
/* Check for stock objects */
if (GDI_HANDLE_IS_STOCKOBJ(hobj))
{
DPRINT1("GreDeleteObject: Cannot delete stock object %p.\n", hobj);
return FALSE;
}
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(hobj, 0);
if (!pentry)
{
DPRINT1("GreDeleteObject: Trying to delete invalid object %p\n", hobj);
return FALSE;
}
/* Check for public owner */
if (pentry->ObjectOwner.ulObj == GDI_OBJ_HMGR_PUBLIC)
{
DPRINT1("GreDeleteObject: Trying to delete global object %p\n", hobj);
GDIOBJ_vDereferenceObject(pentry->einfo.pobj);
return FALSE;
}
/* Delete the object */
GDIOBJ_vDeleteObject(pentry->einfo.pobj);
return TRUE;
}
ULONG
NTAPI
GreGetObjectOwner(HGDIOBJ hobj)
{
ULONG ulIndex, ulOwner;
/* Get the handle index */
ulIndex = GDI_HANDLE_GET_INDEX(hobj);
/* Check if the handle is valid */
if (ulIndex >= GDI_HANDLE_COUNT ||
gpentHmgr[ulIndex].Objt == GDIObjType_DEF_TYPE ||
((ULONG_PTR)hobj >> 16) != gpentHmgr[ulIndex].FullUnique)
{
DPRINT1("GreGetObjectOwner: invalid handle 0x%p.\n", hobj);
return GDI_OBJ_HMGR_RESTRICTED;
}
/* Get the object owner */
ulOwner = gpentHmgr[ulIndex].ObjectOwner.ulObj;
if (ulOwner == HandleToUlong(PsGetCurrentProcessId()))
return GDI_OBJ_HMGR_POWNED;
if (ulOwner == GDI_OBJ_HMGR_PUBLIC)
return GDI_OBJ_HMGR_PUBLIC;
return GDI_OBJ_HMGR_RESTRICTED;
}
BOOL
NTAPI
GreSetObjectOwnerEx(
HGDIOBJ hobj,
ULONG ulOwner,
ULONG Flags)
{
PENTRY pentry;
/* Check for stock objects */
if (GDI_HANDLE_IS_STOCKOBJ(hobj))
{
DPRINT("GreSetObjectOwner: Got stock object %p\n", hobj);
return FALSE;
}
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(hobj, Flags);
if (!pentry)
{
DPRINT("GreSetObjectOwner: Invalid handle 0x%p.\n", hobj);
return FALSE;
}
/* Call internal function */
GDIOBJ_vSetObjectOwner(pentry->einfo.pobj, ulOwner);
/* Dereference the object */
GDIOBJ_vDereferenceObject(pentry->einfo.pobj);
return TRUE;
}
BOOL
NTAPI
GreSetObjectOwner(
HGDIOBJ hobj,
ULONG ulOwner)
{
return GreSetObjectOwnerEx(hobj, ulOwner, 0);
}
INT
NTAPI
GreGetObject(
IN HGDIOBJ hobj,
IN INT cbCount,
OUT PVOID pvBuffer)
{
PVOID pvObj;
UCHAR objt;
INT iResult = 0;
/* Verify object type */
objt = ((ULONG_PTR)hobj >> 16) & 0x1f;
if (objt != GDIObjType_BRUSH_TYPE &&
objt != GDIObjType_SURF_TYPE &&
objt != GDIObjType_LFONT_TYPE &&
objt != GDIObjType_PAL_TYPE)
{
DPRINT1("GreGetObject: Invalid object type\n");
return 0;
}
pvObj = GDIOBJ_ReferenceObjectByHandle(hobj, objt);
if (!pvObj)
{
DPRINT("GreGetObject: Could not lock object\n");
return 0;
}
switch (GDI_HANDLE_GET_TYPE(hobj))
{
case GDILoObjType_LO_PEN_TYPE:
case GDILoObjType_LO_EXTPEN_TYPE:
iResult = PEN_GetObject(pvObj, cbCount, pvBuffer);
break;
case GDILoObjType_LO_BRUSH_TYPE:
iResult = BRUSH_GetObject(pvObj, cbCount, pvBuffer);
break;
case GDILoObjType_LO_BITMAP_TYPE:
iResult = BITMAP_GetObject(pvObj, cbCount, pvBuffer);
break;
case GDILoObjType_LO_FONT_TYPE:
iResult = FontGetObject(pvObj, cbCount, pvBuffer);
break;
case GDILoObjType_LO_PALETTE_TYPE:
iResult = PALETTE_GetObject(pvObj, cbCount, pvBuffer);
break;
default:
DPRINT1("GDI object type of 0x%p not implemented\n", hobj);
break;
}
GDIOBJ_vDereferenceObject(pvObj);
return iResult;
}
W32KAPI
INT
APIENTRY
NtGdiExtGetObjectW(
IN HANDLE hobj,
IN INT cjBufferSize,
OUT LPVOID lpBuffer)
{
UINT iResult, cjMaxSize;
union
{
BITMAP bitmap;
DIBSECTION dibsection;
LOGPEN logpen;
LOGBRUSH logbrush;
LOGFONTW logfontw;
EXTLOGFONTW extlogfontw;
ENUMLOGFONTEXDVW enumlogfontexdvw;
} object;
/* Normalize to the largest supported object size */
cjMaxSize = min((UINT)cjBufferSize, sizeof(object));
/* Now do the actual call */
iResult = GreGetObject(hobj, cjMaxSize, lpBuffer ? &object : NULL);
/* Check if we have a buffer and data */
if ((lpBuffer != NULL) && (iResult != 0))
{
/* Enter SEH for buffer transfer */
_SEH2_TRY
{
/* Probe the buffer and copy it */
cjMaxSize = min(cjMaxSize, iResult);
ProbeForWrite(lpBuffer, cjMaxSize, sizeof(WORD));
RtlCopyMemory(lpBuffer, &object, cjMaxSize);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Clear the return value.
* Do *NOT* set last error here! */
iResult = 0;
}
_SEH2_END;
}
/* Return the count */
return iResult;
}
W32KAPI
HANDLE
APIENTRY
NtGdiCreateClientObj(
IN ULONG ulType)
{
POBJ pObject;
HANDLE handle;
/* Check if ulType is valid */
if ((ulType != GDILoObjType_LO_METAFILE16_TYPE) &&
(ulType != GDILoObjType_LO_METAFILE_TYPE) &&
(ulType != GDILoObjType_LO_METADC16_TYPE))
{
DPRINT1("NtGdiCreateClientObj: Invalid object type 0x%lx.\n", ulType);
return NULL;
}
/* Allocate a new object */
pObject = GDIOBJ_AllocateObject(GDIObjType_CLIENTOBJ_TYPE,
sizeof(CLIENTOBJ),
BASEFLAG_LOOKASIDE);
if (!pObject)
{
DPRINT1("NtGdiCreateClientObj: Could not allocate a clientobj.\n");
return NULL;
}
/* Set the real object type */
pObject->hHmgr = UlongToHandle(ulType | GDILoObjType_LO_CLIENTOBJ_TYPE);
/* Create a handle */
handle = GDIOBJ_hInsertObject(pObject, GDI_OBJ_HMGR_POWNED);
if (!handle)
{
DPRINT1("NtGdiCreateClientObj: Could not create a handle.\n");
GDIOBJ_vFreeObject(pObject);
return NULL;
}
/* Unlock it */
GDIOBJ_vUnlockObject(pObject);
return handle;
}
W32KAPI
BOOL
APIENTRY
NtGdiDeleteClientObj(
IN HANDLE hobj)
{
/* We first need to get the real type from the handle */
ULONG ulType = GDI_HANDLE_GET_TYPE(hobj);
/* Check if it's really a CLIENTOBJ */
if ((ulType & GDI_HANDLE_BASETYPE_MASK) != GDILoObjType_LO_CLIENTOBJ_TYPE)
{
/* FIXME: SetLastError? */
return FALSE;
}
return GreDeleteObject(hobj);
}
PGDI_HANDLE_TABLE GdiHandleTable = NULL;
PGDIOBJ NTAPI
GDIOBJ_ShareLockObj(HGDIOBJ hObj, DWORD ExpectedType)
{
if (ExpectedType == GDI_OBJECT_TYPE_DONTCARE)
ExpectedType = GDI_HANDLE_GET_TYPE(hObj);
return GDIOBJ_ReferenceObjectByHandle(hObj, (ExpectedType >> 16) & 0x1f);
}
// This function is not safe to use with concurrent deleting attempts
// That shouldn't be a problem, since we don't have any processes yet,
// that could delete the handle
BOOL
NTAPI
GDIOBJ_ConvertToStockObj(HGDIOBJ *phObj)
{
PENTRY pentry;
POBJ pobj;
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(*phObj, 0);
if (!pentry)
{
DPRINT1("GDIOBJ: Requested handle 0x%p is not valid.\n", *phObj);
return FALSE;
}
/* Update the entry */
pentry->FullUnique |= GDI_ENTRY_STOCK_MASK;
pentry->ObjectOwner.ulObj = 0;
/* Get the pointer to the BASEOBJECT */
pobj = pentry->einfo.pobj;
/* Calculate the new handle */
pobj->hHmgr = (HGDIOBJ)((ULONG_PTR)pobj->hHmgr | GDI_HANDLE_STOCK_MASK);
/* Return the new handle */
*phObj = pobj->hHmgr;
/* Dereference the handle */
GDIOBJ_vDereferenceObject(pobj);
return TRUE;
}
BOOL
NTAPI
GDIOBJ_ConvertFromStockObj(HGDIOBJ *phObj)
{
PENTRY pentry;
POBJ pobj;
/* Reference the handle entry */
pentry = ENTRY_ReferenceEntryByHandle(*phObj, 0);
if (!pentry)
{
DPRINT1("GDIOBJ: Requested handle 0x%p is not valid.\n", *phObj);
return FALSE;
}
/* Update the entry */
pentry->FullUnique &= ~GDI_ENTRY_STOCK_MASK;
pentry->ObjectOwner.ulObj = PtrToUlong(PsGetCurrentProcessId());
/* Get the pointer to the BASEOBJECT */
pobj = pentry->einfo.pobj;
/* Calculate the new handle */
pobj->hHmgr = (HGDIOBJ)((ULONG_PTR)pobj->hHmgr & ~GDI_HANDLE_STOCK_MASK);
/* Return the new handle */
*phObj = pobj->hHmgr;
/* Dereference the handle */
GDIOBJ_vDereferenceObject(pobj);
return TRUE;
}
POBJ NTAPI
GDIOBJ_AllocObjWithHandle(ULONG ObjectType, ULONG cjSize)
{
POBJ pobj;
FLONG fl = 0;
UCHAR objt = (ObjectType >> 16) & 0xFF;
if ((objt == GDIObjType_DC_TYPE && cjSize == sizeof(DC)) ||
(objt == GDIObjType_PAL_TYPE && cjSize == sizeof(PALETTE)) ||
(objt == GDIObjType_RGN_TYPE && cjSize == sizeof(REGION)) ||
(objt == GDIObjType_SURF_TYPE && cjSize == sizeof(SURFACE)) ||
(objt == GDIObjType_PATH_TYPE && cjSize == sizeof(PATH)))
{
fl |= BASEFLAG_LOOKASIDE;
}
pobj = GDIOBJ_AllocateObject(objt, cjSize, fl);
if (!pobj)
{
return NULL;
}
if (!GDIOBJ_hInsertObject(pobj, GDI_OBJ_HMGR_POWNED))
{
GDIOBJ_vFreeObject(pobj);
return NULL;
}
return pobj;
}
PVOID NTAPI
GDI_MapHandleTable(PEPROCESS pProcess)
{
PVOID pvMappedView = NULL;
NTSTATUS Status;
LARGE_INTEGER liOffset;
SIZE_T cjViewSize = sizeof(GDI_HANDLE_TABLE);
liOffset.QuadPart = 0;
ASSERT(gpvGdiHdlTblSection != NULL);
ASSERT(pProcess != NULL);
Status = MmMapViewOfSection(gpvGdiHdlTblSection,
pProcess,
&pvMappedView,
0,
0,
&liOffset,
&cjViewSize,
ViewUnmap,
SEC_NO_CHANGE,
PAGE_READONLY);
if (!NT_SUCCESS(Status))
return NULL;
return pvMappedView;
}
BOOL NTAPI
GDI_CleanupForProcess(struct _EPROCESS *Process)
{
PENTRY pentry;
ULONG ulIndex;
DWORD dwProcessId;
PPROCESSINFO ppi;
DPRINT("CleanupForProcess prochandle %p Pid %p\n",
Process, Process->UniqueProcessId);
ASSERT(Process == PsGetCurrentProcess());
/* Get the current process Id */
dwProcessId = PtrToUlong(PsGetCurrentProcessId());
/* Loop all handles in the handle table */
for (ulIndex = RESERVE_ENTRIES_COUNT; ulIndex < gulFirstUnused; ulIndex++)
{
pentry = &gpentHmgr[ulIndex];
/* Check if the object is owned by the process */
if (pentry->ObjectOwner.ulObj == dwProcessId)
{
ASSERT(pentry->einfo.pobj->cExclusiveLock == 0);
/* Reference the object and delete it */
InterlockedIncrement((LONG*)&gpaulRefCount[ulIndex]);
GDIOBJ_vDeleteObject(pentry->einfo.pobj);
}
}
#if DBG
DbgGdiHTIntegrityCheck();
#endif
ppi = PsGetCurrentProcessWin32Process();
DPRINT("Completed cleanup for process %p\n", Process->UniqueProcessId);
if (ppi->GDIHandleCount != 0)
{
DPRINT1("Leaking %d handles!\n", ppi->GDIHandleCount);
ASSERT(FALSE);
}
/* Loop all handles in the handle table */
for (ulIndex = RESERVE_ENTRIES_COUNT; ulIndex < gulFirstUnused; ulIndex++)
{
pentry = &gpentHmgr[ulIndex];
/* Check if the object is owned by the process */
if (pentry->ObjectOwner.ulObj == dwProcessId)
{
DPRINT1("Leaking object. Index=%lx, type=0x%x, refcount=%lx\n",
ulIndex, pentry->Objt, gpaulRefCount[ulIndex]);
DBG_DUMP_EVENT_LIST(&pentry->einfo.pobj->slhLog);
//DBG_CLEANUP_EVENT_LIST(&pentry->einfo.pobj->slhLog);
ASSERT(FALSE);
}
}
return TRUE;
}
/// HACK!
PGDI_POOL
GetBrushAttrPool(VOID)
{
PPROCESSINFO ppi;
ppi = PsGetCurrentProcessWin32Process();
NT_ASSERT(ppi != NULL);
return ppi->pPoolBrushAttr;
}
/* EOF */
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