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 <stdlib.h>
  25 #include <string.h>
  26 #include <assert.h>
  27
  28 #include "ole2.h"
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winerror.h"
  32
  33 #include "wine/obj_base.h"
  34
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  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 extern 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 = CRITICAL_SECTION_INIT("IMalloc32_SpyCS");
  65
  66 /* resize the old table */
  67 static int SetSpyedBlockTableLength ( int NewLength )
  68 {
  69         Malloc32.SpyedBlocks = (LPVOID*)LocalReAlloc((HLOCAL)Malloc32.SpyedBlocks, NewLength, GMEM_ZEROINIT);
  70         Malloc32.SpyedBlockTableLength = NewLength;
  71         return Malloc32.SpyedBlocks ? 1 : 0;
  72 }
  73
  74 /* add a location to the table */
  75 static int AddMemoryLocation(LPVOID * pMem)
  76 {
  77         LPVOID * Current;
  78
  79         /* allocate the table if not already allocated */
  80         if (!Malloc32.SpyedBlockTableLength) {
  81             if (!SetSpyedBlockTableLength(0x1000)) return 0;
  82         }
  83
  84         /* find a free location */
  85         Current = Malloc32.SpyedBlocks;
  86         while (*Current) {
  87             Current++;
  88             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength) {
  89                 /* no more space in table, grow it */
  90                 if (!SetSpyedBlockTableLength( Malloc32.SpyedBlockTableLength + 0x1000 )) return 0;
  91             }
  92         };
  93
  94         /* put the location in our table */
  95         *Current = pMem;
  96         Malloc32.SpyedAllocationsLeft++;
  97         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
  98         return 1;
  99 }
 100
 101 static int RemoveMemoryLocation(LPVOID * pMem)
 102 {
 103         LPVOID * Current = Malloc32.SpyedBlocks;
 104
 105         /* find the location */
 106         while (*Current != pMem) {
 107             Current++;
 108             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength)  return 0;      /* not found  */
 109         }
 110
 111         /* location found */
 112         Malloc32.SpyedAllocationsLeft--;
 113         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
 114         *Current = NULL;
 115         return 1;
 116 }
 117
 118 /******************************************************************************
 119  *      IMalloc32_QueryInterface        [VTABLE]
 120  */
 121 static HRESULT WINAPI IMalloc_fnQueryInterface(LPMALLOC iface,REFIID refiid,LPVOID *obj) {
 122
 123         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
 124
 125         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMalloc,refiid)) {
 126                 *obj = (LPMALLOC)&Malloc32;
 127                 return S_OK;
 128         }
 129         return E_NOINTERFACE;
 130 }
 131
 132 /******************************************************************************
 133  *      IMalloc32_AddRefRelease         [VTABLE]
 134  */
 135 static ULONG WINAPI IMalloc_fnAddRefRelease (LPMALLOC iface) {
 136         return 1;
 137 }
 138
 139 /******************************************************************************
 140  *      IMalloc32_Alloc                 [VTABLE]
 141  */
 142 static LPVOID WINAPI IMalloc_fnAlloc(LPMALLOC iface, DWORD cb) {
 143
 144         LPVOID addr;
 145
 146         TRACE("(%ld)\n",cb);
 147
 148         if(Malloc32.pSpy) {
 149             EnterCriticalSection(&IMalloc32_SpyCS);
 150             cb = IMallocSpy_PreAlloc(Malloc32.pSpy, cb);
 151             if (0==cb) {
 152                 /* PreAlloc can force Alloc to fail */
 153                 LeaveCriticalSection(&IMalloc32_SpyCS);
 154                 return NULL;
 155             }
 156         }
 157
 158
 159         addr = HeapAlloc(GetProcessHeap(),0,cb);
 160
 161         if(Malloc32.pSpy) {
 162             addr = IMallocSpy_PostAlloc(Malloc32.pSpy, addr);
 163             if (addr) AddMemoryLocation(addr);
 164             LeaveCriticalSection(&IMalloc32_SpyCS);
 165         }
 166
 167         TRACE("--(%p)\n",addr);
 168         return addr;
 169 }
 170
 171 /******************************************************************************
 172  * IMalloc32_Realloc [VTABLE]
 173  */
 174 static LPVOID WINAPI IMalloc_fnRealloc(LPMALLOC iface,LPVOID pv,DWORD cb) {
 175
 176         LPVOID pNewMemory;
 177
 178         TRACE("(%p,%ld)\n",pv,cb);
 179
 180         if(Malloc32.pSpy) {
 181             LPVOID pRealMemory;
 182             BOOL fSpyed;
 183
 184             EnterCriticalSection(&IMalloc32_SpyCS);
 185             fSpyed = RemoveMemoryLocation(pv);
 186             cb = IMallocSpy_PreRealloc(Malloc32.pSpy, pv, cb, &pRealMemory, fSpyed);
 187
 188             /* check if can release the spy */
 189             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
 190                 IMallocSpy_Release(Malloc32.pSpy);
 191                 Malloc32.SpyReleasePending = FALSE;
 192                 Malloc32.pSpy = NULL;
 193             }
 194
 195             if (0==cb) {
 196                 /* PreRealloc can force Realloc to fail */
 197                 LeaveCriticalSection(&IMalloc32_SpyCS);
 198                 return NULL;
 199             }
 200             pv = pRealMemory;
 201         }
 202
 203         pNewMemory = HeapReAlloc(GetProcessHeap(),0,pv,cb);
 204
 205         if(Malloc32.pSpy) {
 206             pNewMemory = IMallocSpy_PostRealloc(Malloc32.pSpy, pNewMemory, TRUE);
 207             if (pNewMemory) AddMemoryLocation(pNewMemory);
 208             LeaveCriticalSection(&IMalloc32_SpyCS);
 209         }
 210
 211         TRACE("--(%p)\n",pNewMemory);
 212         return pNewMemory;
 213 }
 214
 215 /******************************************************************************
 216  * IMalloc32_Free [VTABLE]
 217  */
 218 static VOID WINAPI IMalloc_fnFree(LPMALLOC iface,LPVOID pv) {
 219
 220         BOOL fSpyed = 0;
 221
 222         TRACE("(%p)\n",pv);
 223
 224         if(Malloc32.pSpy) {
 225             EnterCriticalSection(&IMalloc32_SpyCS);
 226             fSpyed = RemoveMemoryLocation(pv);
 227             pv = IMallocSpy_PreFree(Malloc32.pSpy, pv, fSpyed);
 228         }
 229
 230         HeapFree(GetProcessHeap(),0,pv);
 231
 232         if(Malloc32.pSpy) {
 233             IMallocSpy_PostFree(Malloc32.pSpy, fSpyed);
 234
 235             /* check if can release the spy */
 236             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
 237                 IMallocSpy_Release(Malloc32.pSpy);
 238                 Malloc32.SpyReleasePending = FALSE;
 239                 Malloc32.pSpy = NULL;
 240             }
 241
 242             LeaveCriticalSection(&IMalloc32_SpyCS);
 243         }
 244 }
 245
 246 /******************************************************************************
 247  * IMalloc32_GetSize [VTABLE]
 248  *
 249  * NOTES
 250  *  FIXME returns:
 251  *      win95:  size allocated (4 byte boundarys)
 252  *      win2k:  size originally requested !!! (allocated on 8 byte boundarys)
 253  */
 254 static DWORD WINAPI IMalloc_fnGetSize(LPMALLOC iface,LPVOID pv) {
 255
 256         DWORD cb;
 257         BOOL fSpyed = 0;
 258
 259         TRACE("(%p)\n",pv);
 260
 261         if(Malloc32.pSpy) {
 262             EnterCriticalSection(&IMalloc32_SpyCS);
 263             pv = IMallocSpy_PreGetSize(Malloc32.pSpy, pv, fSpyed);
 264         }
 265
 266         cb = HeapSize(GetProcessHeap(),0,pv);
 267
 268         if(Malloc32.pSpy) {
 269             cb = IMallocSpy_PostGetSize(Malloc32.pSpy, cb, fSpyed);
 270             LeaveCriticalSection(&IMalloc32_SpyCS);
 271         }
 272
 273         return cb;
 274 }
 275
 276 /******************************************************************************
 277  * IMalloc32_DidAlloc [VTABLE]
 278  */
 279 static INT WINAPI IMalloc_fnDidAlloc(LPMALLOC iface,LPVOID pv) {
 280
 281         BOOL fSpyed = 0;
 282         int didAlloc;
 283
 284         TRACE("(%p)\n",pv);
 285
 286         if(Malloc32.pSpy) {
 287             EnterCriticalSection(&IMalloc32_SpyCS);
 288             pv = IMallocSpy_PreDidAlloc(Malloc32.pSpy, pv, fSpyed);
 289         }
 290
 291         didAlloc = -1;
 292
 293         if(Malloc32.pSpy) {
 294             didAlloc = IMallocSpy_PostDidAlloc(Malloc32.pSpy, pv, fSpyed, didAlloc);
 295             LeaveCriticalSection(&IMalloc32_SpyCS);
 296         }
 297         return didAlloc;
 298 }
 299
 300 /******************************************************************************
 301  * IMalloc32_HeapMinimize [VTABLE]
 302  */
 303 static VOID WINAPI IMalloc_fnHeapMinimize(LPMALLOC iface) {
 304         TRACE("()\n");
 305
 306         if(Malloc32.pSpy) {
 307             EnterCriticalSection(&IMalloc32_SpyCS);
 308             IMallocSpy_PreHeapMinimize(Malloc32.pSpy);
 309         }
 310
 311         if(Malloc32.pSpy) {
 312             IMallocSpy_PostHeapMinimize(Malloc32.pSpy);
 313             LeaveCriticalSection(&IMalloc32_SpyCS);
 314         }
 315 }
 316
 317 static ICOM_VTABLE(IMalloc) VT_IMalloc32 =
 318 {
 319         ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 320         IMalloc_fnQueryInterface,
 321         IMalloc_fnAddRefRelease,
 322         IMalloc_fnAddRefRelease,
 323         IMalloc_fnAlloc,
 324         IMalloc_fnRealloc,
 325         IMalloc_fnFree,
 326         IMalloc_fnGetSize,
 327         IMalloc_fnDidAlloc,
 328         IMalloc_fnHeapMinimize
 329 };
 330
 331 /******************************************************************************
 332  *      IMallocSpy implementation
 333  *****************************************************************************/
 334
 335 /* set the vtable later */
 336 extern ICOM_VTABLE(IMallocSpy) VT_IMallocSpy;
 337
 338 typedef struct {
 339         ICOM_VFIELD(IMallocSpy);
 340         DWORD ref;
 341 } _MallocSpy;
 342
 343 /* this is the static object instance */
 344 _MallocSpy MallocSpy = {&VT_IMallocSpy, 0};
 345
 346 /******************************************************************************
 347  *      IMalloc32_QueryInterface        [VTABLE]
 348  */
 349 static HRESULT WINAPI IMallocSpy_fnQueryInterface(LPMALLOCSPY iface,REFIID refiid,LPVOID *obj)
 350 {
 351
 352         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
 353
 354         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMallocSpy,refiid)) {
 355                 *obj = (LPMALLOC)&MallocSpy;
 356                 return S_OK;
 357         }
 358         return E_NOINTERFACE;
 359 }
 360
 361 /******************************************************************************
 362  *      IMalloc32_AddRef                [VTABLE]
 363  */
 364 static ULONG WINAPI IMallocSpy_fnAddRef (LPMALLOCSPY iface)
 365 {
 366
 367     ICOM_THIS (_MallocSpy, iface);
 368
 369     TRACE ("(%p)->(count=%lu)\n", This, This->ref);
 370
 371     return ++(This->ref);
 372 }
 373
 374 /******************************************************************************
 375  *      IMalloc32_AddRelease            [VTABLE]
 376  *
 377  * NOTES
 378  *   Our MallocSpy is static. If the count reaches 0 we dump the leaks
 379  */
 380 static ULONG WINAPI IMallocSpy_fnRelease (LPMALLOCSPY iface)
 381 {
 382
 383     ICOM_THIS (_MallocSpy, iface);
 384
 385     TRACE ("(%p)->(count=%lu)\n", This, This->ref);
 386
 387     if (!--(This->ref)) {
 388         /* our allocation list MUST be empty here */
 389     }
 390     return This->ref;
 391 }
 392
 393 static ULONG WINAPI IMallocSpy_fnPreAlloc(LPMALLOCSPY iface, ULONG cbRequest)
 394 {
 395     ICOM_THIS (_MallocSpy, iface);
 396     TRACE ("(%p)->(%lu)\n", This, cbRequest);
 397     return cbRequest;
 398 }
 399 static PVOID WINAPI IMallocSpy_fnPostAlloc(LPMALLOCSPY iface, void* pActual)
 400 {
 401     ICOM_THIS (_MallocSpy, iface);
 402     TRACE ("(%p)->(%p)\n", This, pActual);
 403     return pActual;
 404 }
 405
 406 static PVOID WINAPI IMallocSpy_fnPreFree(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
 407 {
 408     ICOM_THIS (_MallocSpy, iface);
 409     TRACE ("(%p)->(%p %u)\n", This, pRequest, fSpyed);
 410     return pRequest;
 411 }
 412 static void  WINAPI IMallocSpy_fnPostFree(LPMALLOCSPY iface, BOOL fSpyed)
 413 {
 414     ICOM_THIS (_MallocSpy, iface);
 415     TRACE ("(%p)->(%u)\n", This, fSpyed);
 416 }
 417
 418 static ULONG WINAPI IMallocSpy_fnPreRealloc(LPMALLOCSPY iface, void* pRequest, ULONG cbRequest, void** ppNewRequest, BOOL fSpyed)
 419 {
 420     ICOM_THIS (_MallocSpy, iface);
 421     TRACE ("(%p)->(%p %lu %u)\n", This, pRequest, cbRequest, fSpyed);
 422     *ppNewRequest = pRequest;
 423     return cbRequest;
 424 }
 425
 426 static PVOID WINAPI IMallocSpy_fnPostRealloc(LPMALLOCSPY iface, void* pActual, BOOL fSpyed)
 427 {
 428     ICOM_THIS (_MallocSpy, iface);
 429     TRACE ("(%p)->(%p %u)\n", This, pActual, fSpyed);
 430     return pActual;
 431 }
 432
 433 static PVOID WINAPI IMallocSpy_fnPreGetSize(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
 434 {
 435     ICOM_THIS (_MallocSpy, iface);
 436     TRACE ("(%p)->(%p %u)\n", This,  pRequest, fSpyed);
 437     return pRequest;
 438 }
 439
 440 static ULONG WINAPI IMallocSpy_fnPostGetSize(LPMALLOCSPY iface, ULONG cbActual, BOOL fSpyed)
 441 {
 442     ICOM_THIS (_MallocSpy, iface);
 443     TRACE ("(%p)->(%lu %u)\n", This, cbActual, fSpyed);
 444     return cbActual;
 445 }
 446
 447 static PVOID WINAPI IMallocSpy_fnPreDidAlloc(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed)
 448 {
 449     ICOM_THIS (_MallocSpy, iface);
 450     TRACE ("(%p)->(%p %u)\n", This, pRequest, fSpyed);
 451     return pRequest;
 452 }
 453
 454 static int WINAPI IMallocSpy_fnPostDidAlloc(LPMALLOCSPY iface, void* pRequest, BOOL fSpyed, int fActual)
 455 {
 456     ICOM_THIS (_MallocSpy, iface);
 457     TRACE ("(%p)->(%p %u %u)\n", This, pRequest, fSpyed, fActual);
 458     return fActual;
 459 }
 460
 461 static int WINAPI IMallocSpy_fnPreHeapMinimize(LPMALLOCSPY iface)
 462 {
 463     ICOM_THIS (_MallocSpy, iface);
 464     TRACE ("(%p)->()\n", This);
 465     return 0;
 466 }
 467
 468 static int WINAPI IMallocSpy_fnPostHeapMinimize(LPMALLOCSPY iface)
 469 {
 470     ICOM_THIS (_MallocSpy, iface);
 471     TRACE ("(%p)->()\n", This);
 472     return 0;
 473 }
 474
 475 static void MallocSpyDumpLeaks() {
 476         TRACE("leaks: %lu\n", Malloc32.SpyedAllocationsLeft);
 477 }
 478
 479 static ICOM_VTABLE(IMallocSpy) VT_IMallocSpy =
 480 {
 481         ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 482         IMallocSpy_fnQueryInterface,
 483         IMallocSpy_fnAddRef,
 484         IMallocSpy_fnRelease,
 485         IMallocSpy_fnPreAlloc,
 486         IMallocSpy_fnPostAlloc,
 487         IMallocSpy_fnPreFree,
 488         IMallocSpy_fnPostFree,
 489         IMallocSpy_fnPreRealloc,
 490         IMallocSpy_fnPostRealloc,
 491         IMallocSpy_fnPreGetSize,
 492         IMallocSpy_fnPostGetSize,
 493         IMallocSpy_fnPreDidAlloc,
 494         IMallocSpy_fnPostDidAlloc,
 495         IMallocSpy_fnPreHeapMinimize,
 496         IMallocSpy_fnPostHeapMinimize
 497 };
 498
 499 /******************************************************************************
 500  *              CoGetMalloc     [OLE32.20]
 501  *
 502  * RETURNS
 503  *      The win32 IMalloc
 504  */
 505 HRESULT WINAPI CoGetMalloc(DWORD dwMemContext, LPMALLOC *lpMalloc)
 506 {
 507         *lpMalloc = (LPMALLOC)&Malloc32;
 508         return S_OK;
 509 }
 510
 511 /***********************************************************************
 512  *           CoTaskMemAlloc     [OLE32.43]
 513  * RETURNS
 514  *      pointer to newly allocated block
 515  */
 516 LPVOID WINAPI CoTaskMemAlloc(ULONG size)
 517 {
 518         return IMalloc_Alloc((LPMALLOC)&Malloc32,size);
 519 }
 520 /***********************************************************************
 521  *           CoTaskMemFree      [OLE32.44]
 522  */
 523 VOID WINAPI CoTaskMemFree(LPVOID ptr)
 524 {
 525         IMalloc_Free((LPMALLOC)&Malloc32, ptr);
 526 }
 527
 528 /***********************************************************************
 529  *           CoTaskMemRealloc   [OLE32.45]
 530  * RETURNS
 531  *      pointer to newly allocated block
 532  */
 533 LPVOID WINAPI CoTaskMemRealloc(LPVOID pvOld, ULONG size)
 534 {
 535         return IMalloc_Realloc((LPMALLOC)&Malloc32, pvOld, size);
 536 }
 537
 538 /***********************************************************************
 539  *           CoRegisterMallocSpy        [OLE32.37]
 540  *
 541  * NOTES
 542  *  if a mallocspy is already registered, we cant do it again since
 543  *  only the spy knows, how to free a memory block
 544  */
 545 HRESULT WINAPI CoRegisterMallocSpy(LPMALLOCSPY pMallocSpy)
 546 {
 547         IMallocSpy* pSpy;
 548         HRESULT hres = E_INVALIDARG;
 549
 550         TRACE("\n");
 551
 552         /* HACK TO ACTIVATE OUT SPY */
 553         if (pMallocSpy == (LPVOID)-1) pMallocSpy =(IMallocSpy*)&MallocSpy;
 554
 555         if(Malloc32.pSpy) return CO_E_OBJISREG;
 556
 557         EnterCriticalSection(&IMalloc32_SpyCS);
 558
 559         if (SUCCEEDED(IUnknown_QueryInterface(pMallocSpy, &IID_IMallocSpy, (LPVOID*)&pSpy))) {
 560             Malloc32.pSpy = pSpy;
 561             hres = S_OK;
 562         }
 563
 564         LeaveCriticalSection(&IMalloc32_SpyCS);
 565
 566         return hres;
 567 }
 568
 569 /***********************************************************************
 570  *           CoRevokeMallocSpy  [OLE32.41]
 571  *
 572  * NOTES
 573  *  we can't rewoke a malloc spy as long as memory blocks allocated with
 574  *  the spy are active since only the spy knows how to free them
 575  */
 576 HRESULT WINAPI CoRevokeMallocSpy(void)
 577 {
 578         HRESULT hres = S_OK;
 579         TRACE("\n");
 580
 581         EnterCriticalSection(&IMalloc32_SpyCS);
 582
 583         /* if it's our spy it's time to dump the leaks */
 584         if (Malloc32.pSpy == (IMallocSpy*)&MallocSpy) {
 585             MallocSpyDumpLeaks();
 586         }
 587
 588         if (Malloc32.SpyedAllocationsLeft) {
 589             TRACE("SpyReleasePending with %lu allocations left\n", Malloc32.SpyedAllocationsLeft);
 590             Malloc32.SpyReleasePending = TRUE;
 591             hres = E_ACCESSDENIED;
 592         } else {
 593             IMallocSpy_Release(Malloc32.pSpy);
 594             Malloc32.pSpy = NULL;
 595         }
 596         LeaveCriticalSection(&IMalloc32_SpyCS);
 597
 598         return S_OK;
 599 }
 600
 601 /******************************************************************************
 602  *              IsValidInterface        [OLE32.78]
 603  *
 604  * RETURNS
 605  *  True, if the passed pointer is a valid interface
 606  */
 607 BOOL WINAPI IsValidInterface(
 608         LPUNKNOWN punk  /* [in] interface to be tested */
 609 ) {
 610         return !(
 611                 IsBadReadPtr(punk,4)                                    ||
 612                 IsBadReadPtr(ICOM_VTBL(punk),4)                         ||
 613                 IsBadReadPtr(ICOM_VTBL(punk)->QueryInterface,9) ||
 614                 IsBadCodePtr((FARPROC)ICOM_VTBL(punk)->QueryInterface)
 615         );
 616 }