git.oblomov.eu Git - wine/blob - 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winuser.h"
  32 #include "ole2.h"
  33 #include "winerror.h"
  34
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(olemalloc);
  38
  39 /******************************************************************************
  40  *      IMalloc32 implementation
  41  *
  42  * NOTES
  43  *  For supporting CoRegisterMallocSpy the IMalloc implementation must know if
  44  *  a given memory block was allocated with a spy active.
  45  *
  46  *****************************************************************************/
  47 /* set the vtable later */
  48 static ICOM_VTABLE(IMalloc) VT_IMalloc32;
  49
  50 typedef struct {
  51         ICOM_VFIELD(IMalloc);
  52         DWORD dummy;                /* nothing, we are static */
  53         IMallocSpy * pSpy;          /* the spy when active */
  54         DWORD SpyedAllocationsLeft; /* number of spyed allocations left */
  55         BOOL SpyReleasePending;     /* CoRevokeMallocSpy called with spyed allocations left*/
  56         LPVOID * SpyedBlocks;       /* root of the table */
  57         int SpyedBlockTableLength;  /* size of the table*/
  58 } _Malloc32;
  59
  60 /* this is the static object instance */
  61 _Malloc32 Malloc32 = {&VT_IMalloc32, 0, NULL, 0, 0, NULL, 0};
  62
  63 /* with a spy active all calls from pre to post methods are threadsave */
  64 static CRITICAL_SECTION IMalloc32_SpyCS;
  65 static CRITICAL_SECTION_DEBUG critsect_debug =
  66 {
  67     0, 0, &IMalloc32_SpyCS,
  68     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  69       0, 0, { 0, (DWORD)(__FILE__ ": IMalloc32_SpyCS") }
  70 };
  71 static CRITICAL_SECTION IMalloc32_SpyCS = { &critsect_debug, -1, 0, 0, 0, 0 };
  72
  73 /* resize the old table */
  74 static int SetSpyedBlockTableLength ( int NewLength )
  75 {
  76         LPVOID *NewSpyedBlocks;
  77
  78         if (!Malloc32.SpyedBlocks) NewSpyedBlocks = LocalAlloc(GMEM_ZEROINIT, NewLength);
  79         else NewSpyedBlocks = LocalReAlloc(Malloc32.SpyedBlocks, NewLength, GMEM_ZEROINIT);
  80         if (NewSpyedBlocks) {
  81                 Malloc32.SpyedBlocks = NewSpyedBlocks;
  82                 Malloc32.SpyedBlockTableLength = NewLength;
  83         }
  84
  85         return NewSpyedBlocks != NULL;
  86 }
  87
  88 /* add a location to the table */
  89 static int AddMemoryLocation(LPVOID * pMem)
  90 {
  91         LPVOID * Current;
  92
  93         /* allocate the table if not already allocated */
  94         if (!Malloc32.SpyedBlockTableLength) {
  95             if (!SetSpyedBlockTableLength(0x1000)) return 0;
  96         }
  97
  98         /* find a free location */
  99         Current = Malloc32.SpyedBlocks;
 100         while (*Current) {
 101             Current++;
 102             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength) {
 103                 /* no more space in table, grow it */
 104                 if (!SetSpyedBlockTableLength( Malloc32.SpyedBlockTableLength + 0x1000 )) return 0;
 105             }
 106         };
 107
 108         /* put the location in our table */
 109         *Current = pMem;
 110         Malloc32.SpyedAllocationsLeft++;
 111         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
 112         return 1;
 113 }
 114
 115 static int RemoveMemoryLocation(LPVOID * pMem)
 116 {
 117         LPVOID * Current;
 118
 119         /* allocate the table if not already allocated */
 120         if (!Malloc32.SpyedBlockTableLength) {
 121             if (!SetSpyedBlockTableLength(0x1000)) return 0;
 122         }
 123
 124         Current = Malloc32.SpyedBlocks;
 125
 126         /* find the location */
 127         while (*Current != pMem) {
 128             Current++;
 129             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength)  return 0;      /* not found  */
 130         }
 131
 132         /* location found */
 133         Malloc32.SpyedAllocationsLeft--;
 134         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
 135         *Current = NULL;
 136         return 1;
 137 }
 138
 139 /******************************************************************************
 140  *      IMalloc32_QueryInterface        [VTABLE]
 141  */
 142 static HRESULT WINAPI IMalloc_fnQueryInterface(LPMALLOC iface,REFIID refiid,LPVOID *obj) {
 143
 144         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
 145
 146         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMalloc,refiid)) {
 147                 *obj = (LPMALLOC)&Malloc32;
 148                 return S_OK;
 149         }
 150         return E_NOINTERFACE;
 151 }
 152
 153 /******************************************************************************
 154  *      IMalloc32_AddRefRelease         [VTABLE]
 155  */
 156 static ULONG WINAPI IMalloc_fnAddRefRelease (LPMALLOC iface) {
 157         return 1;
 158 }
 159
 160 /******************************************************************************
 161  *      IMalloc32_Alloc                 [VTABLE]
 162  */
 163 static LPVOID WINAPI IMalloc_fnAlloc(LPMALLOC iface, DWORD cb) {
 164
 165         LPVOID addr;
 166
 167         TRACE("(%ld)\n",cb);
 168
 169         if(Malloc32.pSpy) {
 170             DWORD preAllocResult;
 171
 172             EnterCriticalSection(&IMalloc32_SpyCS);
 173             preAllocResult = IMallocSpy_PreAlloc(Malloc32.pSpy, cb);
 174             if ((cb != 0) && (preAllocResult == 0)) {
 175                 /* PreAlloc can force Alloc to fail, but not if cb == 0 */
 176                 TRACE("returning null\n");
 177                 LeaveCriticalSection(&IMalloc32_SpyCS);
 178                 return NULL;
 179             }
 180         }
 181
 182         addr = HeapAlloc(GetProcessHeap(),0,cb);
 183
 184         if(Malloc32.pSpy) {
 185             addr = IMallocSpy_PostAlloc(Malloc32.pSpy, addr);
 186             if (addr) AddMemoryLocation(addr);
 187             LeaveCriticalSection(&IMalloc32_SpyCS);
 188         }
 189
 190         TRACE("--(%p)\n",addr);
 191         return addr;
 192 }
 193
 194 /******************************************************************************
 195  * IMalloc32_Realloc [VTABLE]
 196  */
 197 static LPVOID WINAPI IMalloc_fnRealloc(LPMALLOC iface,LPVOID pv,DWORD cb) {
 198
 199         LPVOID pNewMemory;
 200
 201         TRACE("(%p,%ld)\n",pv,cb);
 202
 203         if(Malloc32.pSpy) {
 204             LPVOID pRealMemory;
 205             BOOL fSpyed;
 206
 207             EnterCriticalSection(&IMalloc32_SpyCS);
 208             fSpyed = RemoveMemoryLocation(pv);
 209             cb = IMallocSpy_PreRealloc(Malloc32.pSpy, pv, cb, &pRealMemory, fSpyed);
 210
 211             /* check if can release the spy */
 212             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
 213                 IMallocSpy_Release(Malloc32.pSpy);
 214                 Malloc32.SpyReleasePending = FALSE;
 215                 Malloc32.pSpy = NULL;
 216             }
 217
 218             if (0==cb) {
 219                 /* PreRealloc can force Realloc to fail */
 220                 LeaveCriticalSection(&IMalloc32_SpyCS);
 221                 return NULL;
 222             }
 223             pv = pRealMemory;
 224         }
 225
 226         if (!pv) pNewMemory = HeapAlloc(GetProcessHeap(),0,cb);
 227         else if (cb) pNewMemory = HeapReAlloc(GetProcessHeap(),0,pv,cb);
 228         else {
 229             HeapFree(GetProcessHeap(),0,pv);
 230             pNewMemory = NULL;
 231         }
 232
 233         if(Malloc32.pSpy) {
 234             pNewMemory = IMallocSpy_PostRealloc(Malloc32.pSpy, pNewMemory, TRUE);
 235             if (pNewMemory) AddMemoryLocation(pNewMemory);
 236             LeaveCriticalSection(&IMalloc32_SpyCS);
 237         }
 238
 239         TRACE("--(%p)\n",pNewMemory);
 240         return pNewMemory;
 241 }
 242
 243 /******************************************************************************
 244  * IMalloc32_Free [VTABLE]
 245  */
 246 static VOID WINAPI IMalloc_fnFree(LPMALLOC iface,LPVOID pv) {
 247
 248         BOOL fSpyed = 0;
 249
 250         TRACE("(%p)\n",pv);
 251
 252         if(Malloc32.pSpy) {
 253             EnterCriticalSection(&IMalloc32_SpyCS);
 254             fSpyed = RemoveMemoryLocation(pv);
 255             pv = IMallocSpy_PreFree(Malloc32.pSpy, pv, fSpyed);
 256         }
 257
 258         HeapFree(GetProcessHeap(),0,pv);
 259
 260         if(Malloc32.pSpy) {
 261             IMallocSpy_PostFree(Malloc32.pSpy, fSpyed);
 262
 263             /* check if can release the spy */
 264             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
 265                 IMallocSpy_Release(Malloc32.pSpy);
 266                 Malloc32.SpyReleasePending = FALSE;
 267                 Malloc32.pSpy = NULL;
 268             }
 269
 270             LeaveCriticalSection(&IMalloc32_SpyCS);
 271         }
 272 }
 273
 274 /******************************************************************************
 275  * IMalloc32_GetSize [VTABLE]
 276  *
 277  * NOTES
 278  *  FIXME returns:
 279  *      win95:  size allocated (4 byte boundarys)
 280  *      win2k:  size originally requested !!! (allocated on 8 byte boundarys)
 281  */
 282 static DWORD WINAPI IMalloc_fnGetSize(LPMALLOC iface,LPVOID pv) {
 283
 284         DWORD cb;
 285         BOOL fSpyed = 0;
 286
 287         TRACE("(%p)\n",pv);
 288
 289         if(Malloc32.pSpy) {
 290             EnterCriticalSection(&IMalloc32_SpyCS);
 291             pv = IMallocSpy_PreGetSize(Malloc32.pSpy, pv, fSpyed);
 292         }
 293
 294         cb = HeapSize(GetProcessHeap(),0,pv);
 295
 296         if(Malloc32.pSpy) {
 297             cb = IMallocSpy_PostGetSize(Malloc32.pSpy, cb, fSpyed);
 298             LeaveCriticalSection(&IMalloc32_SpyCS);
 299         }
 300
 301         return cb;
 302 }
 303
 304 /******************************************************************************
 305  * IMalloc32_DidAlloc [VTABLE]
 306  */
 307 static INT WINAPI IMalloc_fnDidAlloc(LPMALLOC iface,LPVOID pv) {
 308
 309         BOOL fSpyed = 0;
 310         int didAlloc;
 311
 312         TRACE("(%p)\n",pv);
 313
 314         if(Malloc32.pSpy) {
 315             EnterCriticalSection(&IMalloc32_SpyCS);
 316             pv = IMallocSpy_PreDidAlloc(Malloc32.pSpy, pv, fSpyed);
 317         }
 318
 319         didAlloc = -1;
 320
 321         if(Malloc32.pSpy) {
 322             didAlloc = IMallocSpy_PostDidAlloc(Malloc32.pSpy, pv, fSpyed, didAlloc);
 323             LeaveCriticalSection(&IMalloc32_SpyCS);
 324         }
 325         return didAlloc;
 326 }
 327
 328 /******************************************************************************
 329  * IMalloc32_HeapMinimize [VTABLE]
 330  */
 331 static VOID WINAPI IMalloc_fnHeapMinimize(LPMALLOC iface) {
 332         TRACE("()\n");
 333
 334         if(Malloc32.pSpy) {
 335             EnterCriticalSection(&IMalloc32_SpyCS);
 336             IMallocSpy_PreHeapMinimize(Malloc32.pSpy);
 337         }
 338
 339         if(Malloc32.pSpy) {
 340             IMallocSpy_PostHeapMinimize(Malloc32.pSpy);
 341             LeaveCriticalSection(&IMalloc32_SpyCS);
 342         }
 343 }
 344
 345 static ICOM_VTABLE(IMalloc) VT_IMalloc32 =
 346 {
 347         ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 348         IMalloc_fnQueryInterface,
 349         IMalloc_fnAddRefRelease,
 350         IMalloc_fnAddRefRelease,
 351         IMalloc_fnAlloc,
 352         IMalloc_fnRealloc,
 353         IMalloc_fnFree,
 354         IMalloc_fnGetSize,
 355         IMalloc_fnDidAlloc,
 356         IMalloc_fnHeapMinimize
 357 };
 358
 359 /******************************************************************************
 360  *      IMallocSpy implementation
 361  *****************************************************************************/
 362
 363 /* set the vtable later */
 364 static ICOM_VTABLE(IMallocSpy) VT_IMallocSpy;
 365
 366 typedef struct {
 367         ICOM_VFIELD(IMallocSpy);
 368         DWORD ref;
 369 } _MallocSpy;
 370
 371 /* this is the static object instance */
 372 _MallocSpy MallocSpy = {&VT_IMallocSpy, 0};
 373
 374 /******************************************************************************
 375  *      IMalloc32_QueryInterface        [VTABLE]
 376  */
 377 static HRESULT WINAPI IMallocSpy_fnQueryInterface(LPMALLOCSPY iface,REFIID refiid,LPVOID *obj)
 378 {
 379
 380         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
 381
 382         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMallocSpy,refiid)) {
 383                 *obj = (LPMALLOC)&MallocSpy;
 384                 return S_OK;
 385         }
 386         return E_NOINTERFACE;
 387 }
 388
 389 /******************************************************************************
 390  *      IMalloc32_AddRef                [VTABLE]
 391  */
 392 static ULONG WINAPI IMallocSpy_fnAddRef (LPMALLOCSPY iface)
 393 {
 394
 395     ICOM_THIS (_MallocSpy, iface);
 396
 397     TRACE ("(%p)->(count=%lu)\n", This, This->ref);
 398
 399     return ++(This->ref);
 400 }
 401
 402 /******************************************************************************
 403  *      IMalloc32_AddRelease            [VTABLE]
 404  *
 405  * NOTES
 406  *   Our MallocSpy is static. If the count reaches 0 we dump the leaks
 407  */
 408 static ULONG WINAPI IMallocSpy_fnRelease (LPMALLOCSPY iface)
 409 {
 410
 411     ICOM_THIS (_MallocSpy, iface);
 412
 413     TRACE ("(%p)->(count=%lu)\n", This, This->ref);
 414
 415     if (!--(This->ref)) {
 416         /* our allocation list MUST be empty here */
 417     }
 418     return This->ref;
 419 }
 420
 421 static ULONG WINAPI IMallocSpy_fnPreAlloc(LPMALLOCSPY iface, ULONG cbRequest)
 422 {
 423     ICOM_THIS (_MallocSpy, iface);
 424     TRACE ("(%p)->(%lu)\n", This, cbRequest);
 425     return cbRequest;
 426 }
 427 static PVOID WINAPI IMallocSpy_fnPostAlloc(LPMALLOCSPY iface, void* pActual)
 428 {
 429     ICOM_THIS (_MallocSpy, iface);
 430     TRACE ("(%p)->(%p)\n", This, pActual);
 431     return pActual;
 432 }
 433
 434 static PVOID WINAPI IMallocSpy_fnPreFree(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
 435 {
 436     ICOM_THIS (_MallocSpy, iface);
 437     TRACE ("(%p)->(%p %u)\n", This, pRequest, fSpyed);
 438     return pRequest;
 439 }
 440 static void  WINAPI IMallocSpy_fnPostFree(LPMALLOCSPY iface, BOOL fSpyed)
 441 {
 442     ICOM_THIS (_MallocSpy, iface);
 443     TRACE ("(%p)->(%u)\n", This, fSpyed);
 444 }
 445
 446 static ULONG WINAPI IMallocSpy_fnPreRealloc(LPMALLOCSPY iface, void* pRequest, ULONG cbRequest, void** ppNewRequest, BOOL fSpyed)
 447 {
 448     ICOM_THIS (_MallocSpy, iface);
 449     TRACE ("(%p)->(%p %lu %u)\n", This, pRequest, cbRequest, fSpyed);
 450     *ppNewRequest = pRequest;
 451     return cbRequest;
 452 }
 453
 454 static PVOID WINAPI IMallocSpy_fnPostRealloc(LPMALLOCSPY iface, void* pActual, BOOL fSpyed)
 455 {
 456     ICOM_THIS (_MallocSpy, iface);
 457     TRACE ("(%p)->(%p %u)\n", This, pActual, fSpyed);
 458     return pActual;
 459 }
 460
 461 static PVOID WINAPI IMallocSpy_fnPreGetSize(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
 462 {
 463     ICOM_THIS (_MallocSpy, iface);
 464     TRACE ("(%p)->(%p %u)\n", This,  pRequest, fSpyed);
 465     return pRequest;
 466 }
 467
 468 static ULONG WINAPI IMallocSpy_fnPostGetSize(LPMALLOCSPY iface, ULONG cbActual, BOOL fSpyed)
 469 {
 470     ICOM_THIS (_MallocSpy, iface);
 471     TRACE ("(%p)->(%lu %u)\n", This, cbActual, fSpyed);
 472     return cbActual;
 473 }
 474
 475 static PVOID WINAPI IMallocSpy_fnPreDidAlloc(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
 476 {
 477     ICOM_THIS (_MallocSpy, iface);
 478     TRACE ("(%p)->(%p %u)\n", This, pRequest, fSpyed);
 479     return pRequest;
 480 }
 481
 482 static int WINAPI IMallocSpy_fnPostDidAlloc(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed, int fActual)
 483 {
 484     ICOM_THIS (_MallocSpy, iface);
 485     TRACE ("(%p)->(%p %u %u)\n", This, pRequest, fSpyed, fActual);
 486     return fActual;
 487 }
 488
 489 static void WINAPI IMallocSpy_fnPreHeapMinimize(LPMALLOCSPY iface)
 490 {
 491     ICOM_THIS (_MallocSpy, iface);
 492     TRACE ("(%p)->()\n", This);
 493 }
 494
 495 static void WINAPI IMallocSpy_fnPostHeapMinimize(LPMALLOCSPY iface)
 496 {
 497     ICOM_THIS (_MallocSpy, iface);
 498     TRACE ("(%p)->()\n", This);
 499 }
 500
 501 static void MallocSpyDumpLeaks() {
 502         TRACE("leaks: %lu\n", Malloc32.SpyedAllocationsLeft);
 503 }
 504
 505 static ICOM_VTABLE(IMallocSpy) VT_IMallocSpy =
 506 {
 507         ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 508         IMallocSpy_fnQueryInterface,
 509         IMallocSpy_fnAddRef,
 510         IMallocSpy_fnRelease,
 511         IMallocSpy_fnPreAlloc,
 512         IMallocSpy_fnPostAlloc,
 513         IMallocSpy_fnPreFree,
 514         IMallocSpy_fnPostFree,
 515         IMallocSpy_fnPreRealloc,
 516         IMallocSpy_fnPostRealloc,
 517         IMallocSpy_fnPreGetSize,
 518         IMallocSpy_fnPostGetSize,
 519         IMallocSpy_fnPreDidAlloc,
 520         IMallocSpy_fnPostDidAlloc,
 521         IMallocSpy_fnPreHeapMinimize,
 522         IMallocSpy_fnPostHeapMinimize
 523 };
 524
 525 /******************************************************************************
 526  *              CoGetMalloc     [OLE32.@]
 527  *
 528  * RETURNS
 529  *      The win32 IMalloc
 530  */
 531 HRESULT WINAPI CoGetMalloc(DWORD dwMemContext, LPMALLOC *lpMalloc)
 532 {
 533         *lpMalloc = (LPMALLOC)&Malloc32;
 534         return S_OK;
 535 }
 536
 537 /***********************************************************************
 538  *           CoTaskMemAlloc     [OLE32.@]
 539  * RETURNS
 540  *      pointer to newly allocated block
 541  */
 542 LPVOID WINAPI CoTaskMemAlloc(ULONG size)
 543 {
 544         return IMalloc_Alloc((LPMALLOC)&Malloc32,size);
 545 }
 546 /***********************************************************************
 547  *           CoTaskMemFree      [OLE32.@]
 548  */
 549 VOID WINAPI CoTaskMemFree(LPVOID ptr)
 550 {
 551         IMalloc_Free((LPMALLOC)&Malloc32, ptr);
 552 }
 553
 554 /***********************************************************************
 555  *           CoTaskMemRealloc   [OLE32.@]
 556  * RETURNS
 557  *      pointer to newly allocated block
 558  */
 559 LPVOID WINAPI CoTaskMemRealloc(LPVOID pvOld, ULONG size)
 560 {
 561         return IMalloc_Realloc((LPMALLOC)&Malloc32, pvOld, size);
 562 }
 563
 564 /***********************************************************************
 565  *           CoRegisterMallocSpy        [OLE32.@]
 566  *
 567  * NOTES
 568  *  if a mallocspy is already registered, we can't do it again since
 569  *  only the spy knows, how to free a memory block
 570  */
 571 HRESULT WINAPI CoRegisterMallocSpy(LPMALLOCSPY pMallocSpy)
 572 {
 573         IMallocSpy* pSpy;
 574         HRESULT hres = E_INVALIDARG;
 575
 576         TRACE("\n");
 577
 578         /* HACK TO ACTIVATE OUT SPY */
 579         if (pMallocSpy == (LPVOID)-1) pMallocSpy =(IMallocSpy*)&MallocSpy;
 580
 581         if(Malloc32.pSpy) return CO_E_OBJISREG;
 582
 583         EnterCriticalSection(&IMalloc32_SpyCS);
 584
 585         if (SUCCEEDED(IUnknown_QueryInterface(pMallocSpy, &IID_IMallocSpy, (LPVOID*)&pSpy))) {
 586             Malloc32.pSpy = pSpy;
 587             hres = S_OK;
 588         }
 589
 590         LeaveCriticalSection(&IMalloc32_SpyCS);
 591
 592         return hres;
 593 }
 594
 595 /***********************************************************************
 596  *           CoRevokeMallocSpy  [OLE32.@]
 597  *
 598  * NOTES
 599  *  we can't revoke a malloc spy as long as memory blocks allocated with
 600  *  the spy are active since only the spy knows how to free them
 601  */
 602 HRESULT WINAPI CoRevokeMallocSpy(void)
 603 {
 604         HRESULT hres = S_OK;
 605         TRACE("\n");
 606
 607         EnterCriticalSection(&IMalloc32_SpyCS);
 608
 609         /* if it's our spy it's time to dump the leaks */
 610         if (Malloc32.pSpy == (IMallocSpy*)&MallocSpy) {
 611             MallocSpyDumpLeaks();
 612         }
 613
 614         if (Malloc32.SpyedAllocationsLeft) {
 615             TRACE("SpyReleasePending with %lu allocations left\n", Malloc32.SpyedAllocationsLeft);
 616             Malloc32.SpyReleasePending = TRUE;
 617             hres = E_ACCESSDENIED;
 618         } else {
 619             IMallocSpy_Release(Malloc32.pSpy);
 620             Malloc32.pSpy = NULL;
 621         }
 622         LeaveCriticalSection(&IMalloc32_SpyCS);
 623
 624         return S_OK;
 625 }
 626
 627 /******************************************************************************
 628  *              IsValidInterface        [OLE32.@]
 629  *
 630  * RETURNS
 631  *  True, if the passed pointer is a valid interface
 632  */
 633 BOOL WINAPI IsValidInterface(
 634         LPUNKNOWN punk  /* [in] interface to be tested */
 635 ) {
 636         return !(
 637                 IsBadReadPtr(punk,4)                                    ||
 638                 IsBadReadPtr(punk->lpVtbl,4)                            ||
 639                 IsBadReadPtr(punk->lpVtbl->QueryInterface,9)    ||
 640                 IsBadCodePtr((FARPROC)punk->lpVtbl->QueryInterface)
 641         );
 642 }