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         IMalloc IMalloc_iface;
  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 BOOL 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 | LMEM_MOVEABLE);
  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 BOOL AddMemoryLocation(LPVOID * pMem)
  92 {
  93         LPVOID * Current;
  94
  95         /* allocate the table if not already allocated */
  96         if (!Malloc32.SpyedBlockTableLength && !SetSpyedBlockTableLength(0x1000))
  97             return FALSE;
  98
  99         /* find a free location */
 100         Current = Malloc32.SpyedBlocks;
 101         while (*Current) {
 102             Current++;
 103             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength) {
 104                 /* no more space in table, grow it */
 105                 DWORD old_length = Malloc32.SpyedBlockTableLength;
 106                 if (!SetSpyedBlockTableLength( Malloc32.SpyedBlockTableLength + 0x1000))
 107                     return FALSE;
 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 TRUE;
 117 }
 118
 119 static BOOL RemoveMemoryLocation(LPCVOID pMem)
 120 {
 121         LPVOID * Current;
 122
 123         /* allocate the table if not already allocated */
 124         if (!Malloc32.SpyedBlockTableLength && !SetSpyedBlockTableLength(0x1000))
 125             return FALSE;
 126
 127         Current = Malloc32.SpyedBlocks;
 128
 129         /* find the location */
 130         while (*Current != pMem) {
 131             Current++;
 132             if (Current >= Malloc32.SpyedBlocks + Malloc32.SpyedBlockTableLength)
 133                 return FALSE; /* not found  */
 134         }
 135
 136         /* location found */
 137         Malloc32.SpyedAllocationsLeft--;
 138         /*TRACE("%lu\n",Malloc32.SpyedAllocationsLeft);*/
 139         *Current = NULL;
 140         return TRUE;
 141 }
 142
 143 /******************************************************************************
 144  *      IMalloc32_QueryInterface        [VTABLE]
 145  */
 146 static HRESULT WINAPI IMalloc_fnQueryInterface(IMalloc *iface, REFIID refiid, void **obj)
 147 {
 148         TRACE("(%s,%p)\n",debugstr_guid(refiid),obj);
 149
 150         if (IsEqualIID(&IID_IUnknown,refiid) || IsEqualIID(&IID_IMalloc,refiid)) {
 151                 *obj = &Malloc32;
 152                 return S_OK;
 153         }
 154         return E_NOINTERFACE;
 155 }
 156
 157 /******************************************************************************
 158  *      IMalloc32_AddRefRelease         [VTABLE]
 159  */
 160 static ULONG WINAPI IMalloc_fnAddRefRelease(IMalloc *iface)
 161 {
 162         return 1;
 163 }
 164
 165 /******************************************************************************
 166  *      IMalloc32_Alloc                 [VTABLE]
 167  */
 168 static void * WINAPI IMalloc_fnAlloc(IMalloc *iface, SIZE_T cb)
 169 {
 170         void *addr;
 171
 172         TRACE("(%ld)\n",cb);
 173
 174         if(Malloc32.pSpy) {
 175             SIZE_T preAllocResult;
 176
 177             EnterCriticalSection(&IMalloc32_SpyCS);
 178             preAllocResult = IMallocSpy_PreAlloc(Malloc32.pSpy, cb);
 179             if ((cb != 0) && (preAllocResult == 0)) {
 180                 /* PreAlloc can force Alloc to fail, but not if cb == 0 */
 181                 TRACE("returning null\n");
 182                 LeaveCriticalSection(&IMalloc32_SpyCS);
 183                 return NULL;
 184             }
 185         }
 186
 187         addr = HeapAlloc(GetProcessHeap(),0,cb);
 188
 189         if(Malloc32.pSpy) {
 190             addr = IMallocSpy_PostAlloc(Malloc32.pSpy, addr);
 191             if (addr) AddMemoryLocation(addr);
 192             LeaveCriticalSection(&IMalloc32_SpyCS);
 193         }
 194
 195         TRACE("--(%p)\n",addr);
 196         return addr;
 197 }
 198
 199 /******************************************************************************
 200  * IMalloc32_Realloc [VTABLE]
 201  */
 202 static void * WINAPI IMalloc_fnRealloc(IMalloc *iface, void *pv, SIZE_T cb)
 203 {
 204         void *pNewMemory;
 205
 206         TRACE("(%p,%ld)\n",pv,cb);
 207
 208         if(Malloc32.pSpy) {
 209             void *pRealMemory;
 210             BOOL fSpyed;
 211
 212             EnterCriticalSection(&IMalloc32_SpyCS);
 213             fSpyed = RemoveMemoryLocation(pv);
 214             cb = IMallocSpy_PreRealloc(Malloc32.pSpy, pv, cb, &pRealMemory, fSpyed);
 215
 216             /* check if can release the spy */
 217             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
 218                 IMallocSpy_Release(Malloc32.pSpy);
 219                 Malloc32.SpyReleasePending = FALSE;
 220                 Malloc32.pSpy = NULL;
 221                 LeaveCriticalSection(&IMalloc32_SpyCS);
 222             }
 223
 224             if (0==cb) {
 225                 /* PreRealloc can force Realloc to fail */
 226                 if (Malloc32.pSpy)
 227                     LeaveCriticalSection(&IMalloc32_SpyCS);
 228                 return NULL;
 229             }
 230
 231             pv = pRealMemory;
 232         }
 233
 234         if (!pv) pNewMemory = HeapAlloc(GetProcessHeap(),0,cb);
 235         else if (cb) pNewMemory = HeapReAlloc(GetProcessHeap(),0,pv,cb);
 236         else {
 237             HeapFree(GetProcessHeap(),0,pv);
 238             pNewMemory = NULL;
 239         }
 240
 241         if(Malloc32.pSpy) {
 242             pNewMemory = IMallocSpy_PostRealloc(Malloc32.pSpy, pNewMemory, TRUE);
 243             if (pNewMemory) AddMemoryLocation(pNewMemory);
 244             LeaveCriticalSection(&IMalloc32_SpyCS);
 245         }
 246
 247         TRACE("--(%p)\n",pNewMemory);
 248         return pNewMemory;
 249 }
 250
 251 /******************************************************************************
 252  * IMalloc32_Free [VTABLE]
 253  */
 254 static void WINAPI IMalloc_fnFree(IMalloc *iface, void *pv)
 255 {
 256         BOOL fSpyed = FALSE;
 257
 258         TRACE("(%p)\n",pv);
 259
 260         if(Malloc32.pSpy) {
 261             EnterCriticalSection(&IMalloc32_SpyCS);
 262             fSpyed = RemoveMemoryLocation(pv);
 263             pv = IMallocSpy_PreFree(Malloc32.pSpy, pv, fSpyed);
 264         }
 265
 266         HeapFree(GetProcessHeap(),0,pv);
 267
 268         if(Malloc32.pSpy) {
 269             IMallocSpy_PostFree(Malloc32.pSpy, fSpyed);
 270
 271             /* check if can release the spy */
 272             if(Malloc32.SpyReleasePending && !Malloc32.SpyedAllocationsLeft) {
 273                 IMallocSpy_Release(Malloc32.pSpy);
 274                 Malloc32.SpyReleasePending = FALSE;
 275                 Malloc32.pSpy = NULL;
 276             }
 277
 278             LeaveCriticalSection(&IMalloc32_SpyCS);
 279         }
 280 }
 281
 282 /******************************************************************************
 283  * IMalloc32_GetSize [VTABLE]
 284  *
 285  * NOTES
 286  *  FIXME returns:
 287  *      win95:  size allocated (4 byte boundarys)
 288  *      win2k:  size originally requested !!! (allocated on 8 byte boundarys)
 289  */
 290 static SIZE_T WINAPI IMalloc_fnGetSize(IMalloc *iface, void *pv)
 291 {
 292         SIZE_T cb;
 293         BOOL fSpyed = FALSE;
 294
 295         TRACE("(%p)\n",pv);
 296
 297         if(Malloc32.pSpy) {
 298             EnterCriticalSection(&IMalloc32_SpyCS);
 299             pv = IMallocSpy_PreGetSize(Malloc32.pSpy, pv, fSpyed);
 300         }
 301
 302         cb = HeapSize(GetProcessHeap(),0,pv);
 303
 304         if(Malloc32.pSpy) {
 305             cb = IMallocSpy_PostGetSize(Malloc32.pSpy, cb, fSpyed);
 306             LeaveCriticalSection(&IMalloc32_SpyCS);
 307         }
 308
 309         return cb;
 310 }
 311
 312 /******************************************************************************
 313  * IMalloc32_DidAlloc [VTABLE]
 314  */
 315 static INT WINAPI IMalloc_fnDidAlloc(IMalloc *iface, void *pv)
 316 {
 317         BOOL fSpyed = FALSE;
 318         int didAlloc;
 319
 320         TRACE("(%p)\n",pv);
 321
 322         if(Malloc32.pSpy) {
 323             EnterCriticalSection(&IMalloc32_SpyCS);
 324             pv = IMallocSpy_PreDidAlloc(Malloc32.pSpy, pv, fSpyed);
 325         }
 326
 327         didAlloc = -1;
 328
 329         if(Malloc32.pSpy) {
 330             didAlloc = IMallocSpy_PostDidAlloc(Malloc32.pSpy, pv, fSpyed, didAlloc);
 331             LeaveCriticalSection(&IMalloc32_SpyCS);
 332         }
 333         return didAlloc;
 334 }
 335
 336 /******************************************************************************
 337  * IMalloc32_HeapMinimize [VTABLE]
 338  */
 339 static void WINAPI IMalloc_fnHeapMinimize(IMalloc *iface)
 340 {
 341         TRACE("()\n");
 342
 343         if(Malloc32.pSpy) {
 344             EnterCriticalSection(&IMalloc32_SpyCS);
 345             IMallocSpy_PreHeapMinimize(Malloc32.pSpy);
 346         }
 347
 348         if(Malloc32.pSpy) {
 349             IMallocSpy_PostHeapMinimize(Malloc32.pSpy);
 350             LeaveCriticalSection(&IMalloc32_SpyCS);
 351         }
 352 }
 353
 354 static const IMallocVtbl VT_IMalloc32 =
 355 {
 356         IMalloc_fnQueryInterface,
 357         IMalloc_fnAddRefRelease,
 358         IMalloc_fnAddRefRelease,
 359         IMalloc_fnAlloc,
 360         IMalloc_fnRealloc,
 361         IMalloc_fnFree,
 362         IMalloc_fnGetSize,
 363         IMalloc_fnDidAlloc,
 364         IMalloc_fnHeapMinimize
 365 };
 366
 367 /******************************************************************************
 368  *              CoGetMalloc     [OLE32.@]
 369  *
 370  * Retrieves the current IMalloc interface for the process.
 371  *
 372  * PARAMS
 373  *  context [I] Should always be MEMCTX_TASK.
 374  *  imalloc [O] Address where memory allocator object will be stored.
 375  *
 376  * RETURNS
 377  *      Success: S_OK.
 378  *  Failure: HRESULT code.
 379  */
 380 HRESULT WINAPI CoGetMalloc(DWORD context, IMalloc **imalloc)
 381 {
 382     if (context != MEMCTX_TASK) {
 383         *imalloc = NULL;
 384         return E_INVALIDARG;
 385     }
 386
 387     *imalloc = &Malloc32.IMalloc_iface;
 388     return S_OK;
 389 }
 390
 391 /***********************************************************************
 392  *           CoTaskMemAlloc     [OLE32.@]
 393  *
 394  * Allocates memory using the current process memory allocator.
 395  *
 396  * PARAMS
 397  *  size [I] Size of the memory block to allocate.
 398  *
 399  * RETURNS
 400  *      Success: Pointer to newly allocated memory block.
 401  *  Failure: NULL.
 402  */
 403 LPVOID WINAPI CoTaskMemAlloc(SIZE_T size)
 404 {
 405         return IMalloc_Alloc(&Malloc32.IMalloc_iface,size);
 406 }
 407
 408 /***********************************************************************
 409  *           CoTaskMemFree      [OLE32.@]
 410  *
 411  * Frees memory allocated from the current process memory allocator.
 412  *
 413  * PARAMS
 414  *  ptr [I] Memory block to free.
 415  *
 416  * RETURNS
 417  *  Nothing.
 418  */
 419 VOID WINAPI CoTaskMemFree(LPVOID ptr)
 420 {
 421         IMalloc_Free(&Malloc32.IMalloc_iface, ptr);
 422 }
 423
 424 /***********************************************************************
 425  *           CoTaskMemRealloc   [OLE32.@]
 426  *
 427  * Allocates memory using the current process memory allocator.
 428  *
 429  * PARAMS
 430  *  pvOld [I] Pointer to old memory block.
 431  *  size  [I] Size of the new memory block.
 432  *
 433  * RETURNS
 434  *      Success: Pointer to newly allocated memory block.
 435  *  Failure: NULL.
 436  */
 437 LPVOID WINAPI CoTaskMemRealloc(LPVOID pvOld, SIZE_T size)
 438 {
 439         return IMalloc_Realloc(&Malloc32.IMalloc_iface, pvOld, size);
 440 }
 441
 442 /***********************************************************************
 443  *           CoRegisterMallocSpy        [OLE32.@]
 444  *
 445  * Registers an object that receives notifications on memory allocations and
 446  * frees.
 447  *
 448  * PARAMS
 449  *  pMallocSpy [I] New spy object.
 450  *
 451  * RETURNS
 452  *  Success: S_OK.
 453  *  Failure: HRESULT code.
 454  *
 455  * NOTES
 456  *  if a mallocspy is already registered, we can't do it again since
 457  *  only the spy knows, how to free a memory block
 458  */
 459 HRESULT WINAPI CoRegisterMallocSpy(LPMALLOCSPY pMallocSpy)
 460 {
 461         IMallocSpy* pSpy;
 462         HRESULT hres = E_INVALIDARG;
 463
 464         TRACE("\n");
 465
 466         if(Malloc32.pSpy) return CO_E_OBJISREG;
 467
 468         EnterCriticalSection(&IMalloc32_SpyCS);
 469
 470         if (SUCCEEDED(IMallocSpy_QueryInterface(pMallocSpy, &IID_IMallocSpy, (void**)&pSpy))) {
 471             Malloc32.pSpy = pSpy;
 472             hres = S_OK;
 473         }
 474
 475         LeaveCriticalSection(&IMalloc32_SpyCS);
 476
 477         return hres;
 478 }
 479
 480 /***********************************************************************
 481  *           CoRevokeMallocSpy  [OLE32.@]
 482  *
 483  * Revokes a previously registered object that receives notifications on memory
 484  * allocations and frees.
 485  *
 486  * PARAMS
 487  *  pMallocSpy [I] New spy object.
 488  *
 489  * RETURNS
 490  *  Success: S_OK.
 491  *  Failure: HRESULT code.
 492  *
 493  * NOTES
 494  *  we can't revoke a malloc spy as long as memory blocks allocated with
 495  *  the spy are active since only the spy knows how to free them
 496  */
 497 HRESULT WINAPI CoRevokeMallocSpy(void)
 498 {
 499         HRESULT hres = S_OK;
 500         TRACE("\n");
 501
 502         EnterCriticalSection(&IMalloc32_SpyCS);
 503
 504         if (Malloc32.SpyedAllocationsLeft) {
 505             TRACE("SpyReleasePending with %u allocations left\n", Malloc32.SpyedAllocationsLeft);
 506             Malloc32.SpyReleasePending = TRUE;
 507             hres = E_ACCESSDENIED;
 508         } else {
 509             IMallocSpy_Release(Malloc32.pSpy);
 510             Malloc32.pSpy = NULL;
 511         }
 512         LeaveCriticalSection(&IMalloc32_SpyCS);
 513
 514         return hres;
 515 }
 516
 517 /******************************************************************************
 518  *              IsValidInterface        [OLE32.@]
 519  *
 520  * Determines whether a pointer is a valid interface.
 521  *
 522  * PARAMS
 523  *  punk [I] Interface to be tested.
 524  *
 525  * RETURNS
 526  *  TRUE, if the passed pointer is a valid interface, or FALSE otherwise.
 527  */
 528 BOOL WINAPI IsValidInterface(LPUNKNOWN punk)
 529 {
 530         return !(
 531                 IsBadReadPtr(punk,4)                                    ||
 532                 IsBadReadPtr(punk->lpVtbl,4)                            ||
 533                 IsBadReadPtr(punk->lpVtbl->QueryInterface,9)    ||
 534                 IsBadCodePtr((FARPROC)punk->lpVtbl->QueryInterface)
 535         );
 536 }