setupapi: Implement SetupDiCreateDevRegKeyW.
[wine] / dlls / ole32 / ifs.c
1 /*
2  *      basic interfaces
3  *
4  *      Copyright 1997  Marcus Meissner
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19  */
20
21 #include "config.h"
22
23 #include <ctype.h>
24 #include <stdarg.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <assert.h>
28
29 #define COBJMACROS
30
31 #include "windef.h"
32 #include "winbase.h"
33 #include "winuser.h"
34 #include "ole2.h"
35 #include "winerror.h"
36
37 #include "wine/debug.h"
38
39 WINE_DEFAULT_DEBUG_CHANNEL(olemalloc);
40
41 /******************************************************************************
42  *      IMalloc32 implementation
43  *
44  * NOTES
45  *  For supporting CoRegisterMallocSpy the IMalloc implementation must know if
46  *  a given memory block was allocated with a spy active.
47  *
48  *****************************************************************************/
49 /* set the vtable later */
50 static const IMallocVtbl VT_IMalloc32;
51
52 typedef struct {
53         const IMallocVtbl *lpVtbl;
54         DWORD dummy;                /* nothing, we are static */
55         IMallocSpy * pSpy;          /* the spy when active */
56         DWORD SpyedAllocationsLeft; /* number of spyed allocations left */
57         BOOL SpyReleasePending;     /* CoRevokeMallocSpy called with spyed allocations left*/
58         LPVOID * SpyedBlocks;       /* root of the table */
59         DWORD SpyedBlockTableLength;/* size of the table*/
60 } _Malloc32;
61
62 /* this is the static object instance */
63 static _Malloc32 Malloc32 = {&VT_IMalloc32, 0, NULL, 0, 0, NULL, 0};
64
65 /* with a spy active all calls from pre to post methods are threadsave */
66 static CRITICAL_SECTION IMalloc32_SpyCS;
67 static CRITICAL_SECTION_DEBUG critsect_debug =
68 {
69     0, 0, &IMalloc32_SpyCS,
70     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
71       0, 0, { (DWORD_PTR)(__FILE__ ": IMalloc32_SpyCS") }
72 };
73 static CRITICAL_SECTION IMalloc32_SpyCS = { &critsect_debug, -1, 0, 0, 0, 0 };
74
75 /* resize the old table */
76 static int SetSpyedBlockTableLength ( DWORD NewLength )
77 {
78         LPVOID *NewSpyedBlocks;
79
80         if (!Malloc32.SpyedBlocks) NewSpyedBlocks = LocalAlloc(LMEM_ZEROINIT, NewLength * sizeof(PVOID));
81         else NewSpyedBlocks = LocalReAlloc(Malloc32.SpyedBlocks, NewLength * sizeof(PVOID), LMEM_ZEROINIT);
82         if (NewSpyedBlocks) {
83                 Malloc32.SpyedBlocks = NewSpyedBlocks;
84                 Malloc32.SpyedBlockTableLength = NewLength;
85         }
86
87         return NewSpyedBlocks != NULL;
88 }
89
90 /* add a location to the table */
91 static int AddMemoryLocation(LPVOID * pMem)
92 {
93         LPVOID * Current;
94
95         /* allocate the table if not already allocated */
96         if (!Malloc32.SpyedBlockTableLength) {
97             if (!SetSpyedBlockTableLength(0x1000)) return 0;
98         }
99
100         /* find a free location */
101         Current = Malloc32.SpyedBlocks;
102         while (*Current) {
103             Current++;
104             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength) {
105                 /* no more space in table, grow it */
106                 DWORD old_length = Malloc32.SpyedBlockTableLength;
107                 if (!SetSpyedBlockTableLength( Malloc32.SpyedBlockTableLength + 0x1000 )) return 0;
108                 Current = Malloc32.SpyedBlocks + old_length;
109             }
110         };
111
112         /* put the location in our table */
113         *Current = pMem;
114         Malloc32.SpyedAllocationsLeft++;
115         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
116         return 1;
117 }
118
119 static int RemoveMemoryLocation(LPCVOID pMem)
120 {
121         LPVOID * Current;
122
123         /* allocate the table if not already allocated */
124         if (!Malloc32.SpyedBlockTableLength) {
125             if (!SetSpyedBlockTableLength(0x1000)) return 0;
126         }
127
128         Current = Malloc32.SpyedBlocks;
129
130         /* find the location */
131         while (*Current != pMem) {
132             Current++;
133             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength)  return 0;      /* not found  */
134         }
135
136         /* location found */
137         Malloc32.SpyedAllocationsLeft--;
138         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
139         *Current = NULL;
140         return 1;
141 }
142
143 /******************************************************************************
144  *      IMalloc32_QueryInterface        [VTABLE]
145  */
146 static HRESULT WINAPI IMalloc_fnQueryInterface(LPMALLOC iface,REFIID refiid,LPVOID *obj) {
147
148         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
149
150         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMalloc,refiid)) {
151                 *obj = (LPMALLOC)&Malloc32;
152                 return S_OK;
153         }
154         return E_NOINTERFACE;
155 }
156
157 /******************************************************************************
158  *      IMalloc32_AddRefRelease         [VTABLE]
159  */
160 static ULONG WINAPI IMalloc_fnAddRefRelease (LPMALLOC iface) {
161         return 1;
162 }
163
164 /******************************************************************************
165  *      IMalloc32_Alloc                 [VTABLE]
166  */
167 static LPVOID WINAPI IMalloc_fnAlloc(LPMALLOC iface, DWORD cb) {
168
169         LPVOID addr;
170
171         TRACE("(%d)\n",cb);
172
173         if(Malloc32.pSpy) {
174             DWORD preAllocResult;
175             
176             EnterCriticalSection(&IMalloc32_SpyCS);
177             preAllocResult = IMallocSpy_PreAlloc(Malloc32.pSpy, cb);
178             if ((cb != 0) && (preAllocResult == 0)) {
179                 /* PreAlloc can force Alloc to fail, but not if cb == 0 */
180                 TRACE("returning null\n");
181                 LeaveCriticalSection(&IMalloc32_SpyCS);
182                 return NULL;
183             }
184         }
185         
186         addr = HeapAlloc(GetProcessHeap(),0,cb);
187
188         if(Malloc32.pSpy) {
189             addr = IMallocSpy_PostAlloc(Malloc32.pSpy, addr);
190             if (addr) AddMemoryLocation(addr);
191             LeaveCriticalSection(&IMalloc32_SpyCS);
192         }
193
194         TRACE("--(%p)\n",addr);
195         return addr;
196 }
197
198 /******************************************************************************
199  * IMalloc32_Realloc [VTABLE]
200  */
201 static LPVOID WINAPI IMalloc_fnRealloc(LPMALLOC iface,LPVOID pv,DWORD cb) {
202
203         LPVOID pNewMemory;
204
205         TRACE("(%p,%d)\n",pv,cb);
206
207         if(Malloc32.pSpy) {
208             LPVOID pRealMemory;
209             BOOL fSpyed;
210
211             EnterCriticalSection(&IMalloc32_SpyCS);
212             fSpyed = RemoveMemoryLocation(pv);
213             cb = IMallocSpy_PreRealloc(Malloc32.pSpy, pv, cb, &pRealMemory, fSpyed);
214
215             /* check if can release the spy */
216             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
217                 IMallocSpy_Release(Malloc32.pSpy);
218                 Malloc32.SpyReleasePending = FALSE;
219                 Malloc32.pSpy = NULL;
220             }
221
222             if (0==cb) {
223                 /* PreRealloc can force Realloc to fail */
224                 LeaveCriticalSection(&IMalloc32_SpyCS);
225                 return NULL;
226             }
227             pv = pRealMemory;
228         }
229
230         if (!pv) pNewMemory = HeapAlloc(GetProcessHeap(),0,cb);
231         else if (cb) pNewMemory = HeapReAlloc(GetProcessHeap(),0,pv,cb);
232         else {
233             HeapFree(GetProcessHeap(),0,pv);
234             pNewMemory = NULL;
235         }
236
237         if(Malloc32.pSpy) {
238             pNewMemory = IMallocSpy_PostRealloc(Malloc32.pSpy, pNewMemory, TRUE);
239             if (pNewMemory) AddMemoryLocation(pNewMemory);
240             LeaveCriticalSection(&IMalloc32_SpyCS);
241         }
242
243         TRACE("--(%p)\n",pNewMemory);
244         return pNewMemory;
245 }
246
247 /******************************************************************************
248  * IMalloc32_Free [VTABLE]
249  */
250 static VOID WINAPI IMalloc_fnFree(LPMALLOC iface,LPVOID pv) {
251
252         BOOL fSpyed = 0;
253
254         TRACE("(%p)\n",pv);
255
256         if(Malloc32.pSpy) {
257             EnterCriticalSection(&IMalloc32_SpyCS);
258             fSpyed = RemoveMemoryLocation(pv);
259             pv = IMallocSpy_PreFree(Malloc32.pSpy, pv, fSpyed);
260         }
261
262         HeapFree(GetProcessHeap(),0,pv);
263
264         if(Malloc32.pSpy) {
265             IMallocSpy_PostFree(Malloc32.pSpy, fSpyed);
266
267             /* check if can release the spy */
268             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
269                 IMallocSpy_Release(Malloc32.pSpy);
270                 Malloc32.SpyReleasePending = FALSE;
271                 Malloc32.pSpy = NULL;
272             }
273
274             LeaveCriticalSection(&IMalloc32_SpyCS);
275         }
276 }
277
278 /******************************************************************************
279  * IMalloc32_GetSize [VTABLE]
280  *
281  * NOTES
282  *  FIXME returns:
283  *      win95:  size allocated (4 byte boundarys)
284  *      win2k:  size originally requested !!! (allocated on 8 byte boundarys)
285  */
286 static DWORD WINAPI IMalloc_fnGetSize(LPMALLOC iface,LPVOID pv) {
287
288         DWORD cb;
289         BOOL fSpyed = 0;
290
291         TRACE("(%p)\n",pv);
292
293         if(Malloc32.pSpy) {
294             EnterCriticalSection(&IMalloc32_SpyCS);
295             pv = IMallocSpy_PreGetSize(Malloc32.pSpy, pv, fSpyed);
296         }
297
298         cb = HeapSize(GetProcessHeap(),0,pv);
299
300         if(Malloc32.pSpy) {
301             cb = IMallocSpy_PostGetSize(Malloc32.pSpy, cb, fSpyed);
302             LeaveCriticalSection(&IMalloc32_SpyCS);
303         }
304
305         return cb;
306 }
307
308 /******************************************************************************
309  * IMalloc32_DidAlloc [VTABLE]
310  */
311 static INT WINAPI IMalloc_fnDidAlloc(LPMALLOC iface,LPVOID pv) {
312
313         BOOL fSpyed = 0;
314         int didAlloc;
315
316         TRACE("(%p)\n",pv);
317
318         if(Malloc32.pSpy) {
319             EnterCriticalSection(&IMalloc32_SpyCS);
320             pv = IMallocSpy_PreDidAlloc(Malloc32.pSpy, pv, fSpyed);
321         }
322
323         didAlloc = -1;
324
325         if(Malloc32.pSpy) {
326             didAlloc = IMallocSpy_PostDidAlloc(Malloc32.pSpy, pv, fSpyed, didAlloc);
327             LeaveCriticalSection(&IMalloc32_SpyCS);
328         }
329         return didAlloc;
330 }
331
332 /******************************************************************************
333  * IMalloc32_HeapMinimize [VTABLE]
334  */
335 static VOID WINAPI IMalloc_fnHeapMinimize(LPMALLOC iface) {
336         TRACE("()\n");
337
338         if(Malloc32.pSpy) {
339             EnterCriticalSection(&IMalloc32_SpyCS);
340             IMallocSpy_PreHeapMinimize(Malloc32.pSpy);
341         }
342
343         if(Malloc32.pSpy) {
344             IMallocSpy_PostHeapMinimize(Malloc32.pSpy);
345             LeaveCriticalSection(&IMalloc32_SpyCS);
346         }
347 }
348
349 static const IMallocVtbl VT_IMalloc32 =
350 {
351         IMalloc_fnQueryInterface,
352         IMalloc_fnAddRefRelease,
353         IMalloc_fnAddRefRelease,
354         IMalloc_fnAlloc,
355         IMalloc_fnRealloc,
356         IMalloc_fnFree,
357         IMalloc_fnGetSize,
358         IMalloc_fnDidAlloc,
359         IMalloc_fnHeapMinimize
360 };
361
362 /******************************************************************************
363  *      IMallocSpy implementation
364  *****************************************************************************/
365
366 /* set the vtable later */
367 static const IMallocSpyVtbl VT_IMallocSpy;
368
369 typedef struct {
370         const IMallocSpyVtbl *lpVtbl;
371         LONG ref;
372 } _MallocSpy;
373
374 /* this is the static object instance */
375 static _MallocSpy MallocSpy = {&VT_IMallocSpy, 0};
376
377 /******************************************************************************
378  *      IMalloc32_QueryInterface        [VTABLE]
379  */
380 static HRESULT WINAPI IMallocSpy_fnQueryInterface(LPMALLOCSPY iface,REFIID refiid,LPVOID *obj)
381 {
382
383         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
384
385         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMallocSpy,refiid)) {
386                 *obj = (LPMALLOC)&MallocSpy;
387                 return S_OK;
388         }
389         return E_NOINTERFACE;
390 }
391
392 /******************************************************************************
393  *      IMalloc32_AddRef                [VTABLE]
394  */
395 static ULONG WINAPI IMallocSpy_fnAddRef (LPMALLOCSPY iface)
396 {
397
398     _MallocSpy *This = (_MallocSpy *)iface;
399     ULONG ref = InterlockedIncrement(&This->ref);
400
401     TRACE ("(%p)->(count=%u)\n", This, ref - 1);
402
403     return ref;
404 }
405
406 /******************************************************************************
407  *      IMalloc32_AddRelease            [VTABLE]
408  *
409  * NOTES
410  *   Our MallocSpy is static. If the count reaches 0 we dump the leaks
411  */
412 static ULONG WINAPI IMallocSpy_fnRelease (LPMALLOCSPY iface)
413 {
414
415     _MallocSpy *This = (_MallocSpy *)iface;
416     ULONG ref = InterlockedDecrement(&This->ref);
417
418     TRACE ("(%p)->(count=%u)\n", This, ref + 1);
419
420     if (!ref) {
421         /* our allocation list MUST be empty here */
422     }
423     return ref;
424 }
425
426 static ULONG WINAPI IMallocSpy_fnPreAlloc(LPMALLOCSPY iface, ULONG cbRequest)
427 {
428     _MallocSpy *This = (_MallocSpy *)iface;
429     TRACE ("(%p)->(%u)\n", This, cbRequest);
430     return cbRequest;
431 }
432 static PVOID WINAPI IMallocSpy_fnPostAlloc(LPMALLOCSPY iface, void* pActual)
433 {
434     _MallocSpy *This = (_MallocSpy *)iface;
435     TRACE ("(%p)->(%p)\n", This, pActual);
436     return pActual;
437 }
438
439 static PVOID WINAPI IMallocSpy_fnPreFree(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
440 {
441     _MallocSpy *This = (_MallocSpy *)iface;
442     TRACE ("(%p)->(%p %u)\n", This, pRequest, fSpyed);
443     return pRequest;
444 }
445 static void  WINAPI IMallocSpy_fnPostFree(LPMALLOCSPY iface, BOOL fSpyed)
446 {
447     _MallocSpy *This = (_MallocSpy *)iface;
448     TRACE ("(%p)->(%u)\n", This, fSpyed);
449 }
450
451 static ULONG WINAPI IMallocSpy_fnPreRealloc(LPMALLOCSPY iface, void* pRequest, ULONG cbRequest, void** ppNewRequest, BOOL fSpyed)
452 {
453     _MallocSpy *This = (_MallocSpy *)iface;
454     TRACE ("(%p)->(%p %u %u)\n", This, pRequest, cbRequest, fSpyed);
455     *ppNewRequest = pRequest;
456     return cbRequest;
457 }
458
459 static PVOID WINAPI IMallocSpy_fnPostRealloc(LPMALLOCSPY iface, void* pActual, BOOL fSpyed)
460 {
461     _MallocSpy *This = (_MallocSpy *)iface;
462     TRACE ("(%p)->(%p %u)\n", This, pActual, fSpyed);
463     return pActual;
464 }
465
466 static PVOID WINAPI IMallocSpy_fnPreGetSize(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
467 {
468     _MallocSpy *This = (_MallocSpy *)iface;
469     TRACE ("(%p)->(%p %u)\n", This,  pRequest, fSpyed);
470     return pRequest;
471 }
472
473 static ULONG WINAPI IMallocSpy_fnPostGetSize(LPMALLOCSPY iface, ULONG cbActual, BOOL fSpyed)
474 {
475     _MallocSpy *This = (_MallocSpy *)iface;
476     TRACE ("(%p)->(%u %u)\n", This, cbActual, fSpyed);
477     return cbActual;
478 }
479
480 static PVOID WINAPI IMallocSpy_fnPreDidAlloc(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
481 {
482     _MallocSpy *This = (_MallocSpy *)iface;
483     TRACE ("(%p)->(%p %u)\n", This, pRequest, fSpyed);
484     return pRequest;
485 }
486
487 static int WINAPI IMallocSpy_fnPostDidAlloc(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed, int fActual)
488 {
489     _MallocSpy *This = (_MallocSpy *)iface;
490     TRACE ("(%p)->(%p %u %u)\n", This, pRequest, fSpyed, fActual);
491     return fActual;
492 }
493
494 static void WINAPI IMallocSpy_fnPreHeapMinimize(LPMALLOCSPY iface)
495 {
496     _MallocSpy *This = (_MallocSpy *)iface;
497     TRACE ("(%p)->()\n", This);
498 }
499
500 static void WINAPI IMallocSpy_fnPostHeapMinimize(LPMALLOCSPY iface)
501 {
502     _MallocSpy *This = (_MallocSpy *)iface;
503     TRACE ("(%p)->()\n", This);
504 }
505
506 static void MallocSpyDumpLeaks(void) {
507         TRACE("leaks: %u\n", Malloc32.SpyedAllocationsLeft);
508 }
509
510 static const IMallocSpyVtbl VT_IMallocSpy =
511 {
512         IMallocSpy_fnQueryInterface,
513         IMallocSpy_fnAddRef,
514         IMallocSpy_fnRelease,
515         IMallocSpy_fnPreAlloc,
516         IMallocSpy_fnPostAlloc,
517         IMallocSpy_fnPreFree,
518         IMallocSpy_fnPostFree,
519         IMallocSpy_fnPreRealloc,
520         IMallocSpy_fnPostRealloc,
521         IMallocSpy_fnPreGetSize,
522         IMallocSpy_fnPostGetSize,
523         IMallocSpy_fnPreDidAlloc,
524         IMallocSpy_fnPostDidAlloc,
525         IMallocSpy_fnPreHeapMinimize,
526         IMallocSpy_fnPostHeapMinimize
527 };
528
529 /******************************************************************************
530  *              CoGetMalloc     [OLE32.@]
531  *
532  * Retrieves the current IMalloc interface for the process.
533  *
534  * PARAMS
535  *  dwMemContext [I]
536  *  lpMalloc     [O] Address where memory allocator object will be stored.
537  *
538  * RETURNS
539  *      Success: S_OK.
540  *  Failure: HRESULT code.
541  */
542 HRESULT WINAPI CoGetMalloc(DWORD dwMemContext, LPMALLOC *lpMalloc)
543 {
544         *lpMalloc = (LPMALLOC)&Malloc32;
545         return S_OK;
546 }
547
548 /***********************************************************************
549  *           CoTaskMemAlloc     [OLE32.@]
550  *
551  * Allocates memory using the current process memory allocator.
552  *
553  * PARAMS
554  *  size [I] Size of the memory block to allocate.
555  *
556  * RETURNS
557  *      Success: Pointer to newly allocated memory block.
558  *  Failure: NULL.
559  */
560 LPVOID WINAPI CoTaskMemAlloc(ULONG size)
561 {
562         return IMalloc_Alloc((LPMALLOC)&Malloc32,size);
563 }
564
565 /***********************************************************************
566  *           CoTaskMemFree      [OLE32.@]
567  *
568  * Frees memory allocated from the current process memory allocator.
569  *
570  * PARAMS
571  *  ptr [I] Memory block to free.
572  *
573  * RETURNS
574  *  Nothing.
575  */
576 VOID WINAPI CoTaskMemFree(LPVOID ptr)
577 {
578         IMalloc_Free((LPMALLOC)&Malloc32, ptr);
579 }
580
581 /***********************************************************************
582  *           CoTaskMemRealloc   [OLE32.@]
583  *
584  * Allocates memory using the current process memory allocator.
585  *
586  * PARAMS
587  *  pvOld [I] Pointer to old memory block.
588  *  size  [I] Size of the new memory block.
589  *
590  * RETURNS
591  *      Success: Pointer to newly allocated memory block.
592  *  Failure: NULL.
593  */
594 LPVOID WINAPI CoTaskMemRealloc(LPVOID pvOld, ULONG size)
595 {
596         return IMalloc_Realloc((LPMALLOC)&Malloc32, pvOld, size);
597 }
598
599 /***********************************************************************
600  *           CoRegisterMallocSpy        [OLE32.@]
601  *
602  * Registers an object that receives notifications on memory allocations and
603  * frees.
604  *
605  * PARAMS
606  *  pMallocSpy [I] New spy object.
607  *
608  * RETURNS
609  *  Success: S_OK.
610  *  Failure: HRESULT code.
611  *
612  * NOTES
613  *  if a mallocspy is already registered, we can't do it again since
614  *  only the spy knows, how to free a memory block
615  */
616 HRESULT WINAPI CoRegisterMallocSpy(LPMALLOCSPY pMallocSpy)
617 {
618         IMallocSpy* pSpy;
619         HRESULT hres = E_INVALIDARG;
620
621         TRACE("\n");
622
623         /* HACK TO ACTIVATE OUT SPY */
624         if (pMallocSpy == (LPVOID)-1) pMallocSpy =(IMallocSpy*)&MallocSpy;
625
626         if(Malloc32.pSpy) return CO_E_OBJISREG;
627
628         EnterCriticalSection(&IMalloc32_SpyCS);
629
630         if (SUCCEEDED(IUnknown_QueryInterface(pMallocSpy, &IID_IMallocSpy, (LPVOID*)&pSpy))) {
631             Malloc32.pSpy = pSpy;
632             hres = S_OK;
633         }
634
635         LeaveCriticalSection(&IMalloc32_SpyCS);
636
637         return hres;
638 }
639
640 /***********************************************************************
641  *           CoRevokeMallocSpy  [OLE32.@]
642  *
643  * Revokes a previousl registered object that receives notifications on memory
644  * allocations and frees.
645  *
646  * PARAMS
647  *  pMallocSpy [I] New spy object.
648  *
649  * RETURNS
650  *  Success: S_OK.
651  *  Failure: HRESULT code.
652  *
653  * NOTES
654  *  we can't revoke a malloc spy as long as memory blocks allocated with
655  *  the spy are active since only the spy knows how to free them
656  */
657 HRESULT WINAPI CoRevokeMallocSpy(void)
658 {
659         HRESULT hres = S_OK;
660         TRACE("\n");
661
662         EnterCriticalSection(&IMalloc32_SpyCS);
663
664         /* if it's our spy it's time to dump the leaks */
665         if (Malloc32.pSpy == (IMallocSpy*)&MallocSpy) {
666             MallocSpyDumpLeaks();
667         }
668
669         if (Malloc32.SpyedAllocationsLeft) {
670             TRACE("SpyReleasePending with %u allocations left\n", Malloc32.SpyedAllocationsLeft);
671             Malloc32.SpyReleasePending = TRUE;
672             hres = E_ACCESSDENIED;
673         } else {
674             IMallocSpy_Release(Malloc32.pSpy);
675             Malloc32.pSpy = NULL;
676         }
677         LeaveCriticalSection(&IMalloc32_SpyCS);
678
679         return S_OK;
680 }
681
682 /******************************************************************************
683  *              IsValidInterface        [OLE32.@]
684  *
685  * Determines whether a pointer is a valid interface.
686  *
687  * PARAMS
688  *  punk [I] Interface to be tested.
689  *
690  * RETURNS
691  *  TRUE, if the passed pointer is a valid interface, or FALSE otherwise.
692  */
693 BOOL WINAPI IsValidInterface(LPUNKNOWN punk)
694 {
695         return !(
696                 IsBadReadPtr(punk,4)                                    ||
697                 IsBadReadPtr(punk->lpVtbl,4)                            ||
698                 IsBadReadPtr(punk->lpVtbl->QueryInterface,9)    ||
699                 IsBadCodePtr((FARPROC)punk->lpVtbl->QueryInterface)
700         );
701 }