dll/win32/rpcrt4/cstub.c

   1 /*
   2  * COM stub (CStdStubBuffer) implementation
   3  *
   4  * Copyright 2001 Ove Kåven, TransGaming Technologies
   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 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25
  26 #define COBJMACROS
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "winerror.h"
  31 #include "excpt.h"
  32
  33 #include "objbase.h"
  34 #include "rpcproxy.h"
  35
  36 #include "wine/debug.h"
  37 #include "wine/exception.h"
  38
  39 #include "cpsf.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  42
  43 #define STUB_HEADER(This) (((const CInterfaceStubHeader*)((This)->lpVtbl))[-1])
  44
  45 static LONG WINAPI stub_filter(EXCEPTION_POINTERS *eptr)
  46 {
  47     if (eptr->ExceptionRecord->ExceptionFlags & EXCEPTION_NONCONTINUABLE)
  48         return EXCEPTION_CONTINUE_SEARCH;
  49     return EXCEPTION_EXECUTE_HANDLER;
  50 }
  51
  52 typedef struct
  53 {
  54     IUnknownVtbl *base_obj;
  55     IRpcStubBuffer *base_stub;
  56     CStdStubBuffer stub_buffer;
  57 } cstdstubbuffer_delegating_t;
  58
  59 static inline cstdstubbuffer_delegating_t *impl_from_delegating( IRpcStubBuffer *iface )
  60 {
  61     return (cstdstubbuffer_delegating_t*)((char *)iface - FIELD_OFFSET(cstdstubbuffer_delegating_t, stub_buffer));
  62 }
  63
  64 HRESULT WINAPI CStdStubBuffer_Construct(REFIID riid,
  65                                        LPUNKNOWN pUnkServer,
  66                                        PCInterfaceName name,
  67                                        CInterfaceStubVtbl *vtbl,
  68                                        LPPSFACTORYBUFFER pPSFactory,
  69                                        LPRPCSTUBBUFFER *ppStub)
  70 {
  71   CStdStubBuffer *This;
  72   IUnknown *pvServer;
  73   HRESULT r;
  74   TRACE("(%p,%p,%p,%p) %s\n", pUnkServer, vtbl, pPSFactory, ppStub, name);
  75   TRACE("iid=%s\n", debugstr_guid(vtbl->header.piid));
  76   TRACE("vtbl=%p\n", &vtbl->Vtbl);
  77
  78   if (!IsEqualGUID(vtbl->header.piid, riid)) {
  79     ERR("IID mismatch during stub creation\n");
  80     return RPC_E_UNEXPECTED;
  81   }
  82
  83   r = IUnknown_QueryInterface(pUnkServer, riid, (void**)&pvServer);
  84   if(FAILED(r))
  85     return r;
  86
  87   This = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(CStdStubBuffer));
  88   if (!This) {
  89     IUnknown_Release(pvServer);
  90     return E_OUTOFMEMORY;
  91   }
  92
  93   This->lpVtbl = &vtbl->Vtbl;
  94   This->RefCount = 1;
  95   This->pvServerObject = pvServer;
  96   This->pPSFactory = pPSFactory;
  97   *ppStub = (LPRPCSTUBBUFFER)This;
  98
  99   IPSFactoryBuffer_AddRef(pPSFactory);
 100   return S_OK;
 101 }
 102
 103 static CRITICAL_SECTION delegating_vtbl_section;
 104 static CRITICAL_SECTION_DEBUG critsect_debug =
 105 {
 106     0, 0, &delegating_vtbl_section,
 107     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
 108       0, 0, { (DWORD_PTR)(__FILE__ ": delegating_vtbl_section") }
 109 };
 110 static CRITICAL_SECTION delegating_vtbl_section = { &critsect_debug, -1, 0, 0, 0, 0 };
 111
 112 typedef struct
 113 {
 114     DWORD ref;
 115     DWORD size;
 116     void **methods;
 117     IUnknownVtbl vtbl;
 118     /* remaining entries in vtbl */
 119 } ref_counted_vtbl;
 120
 121 static struct
 122 {
 123     ref_counted_vtbl *table;
 124 } current_vtbl;
 125
 126
 127 static HRESULT WINAPI delegating_QueryInterface(IUnknown *pUnk, REFIID iid, void **ppv)
 128 {
 129     *ppv = (void *)pUnk;
 130     return S_OK;
 131 }
 132
 133 static ULONG WINAPI delegating_AddRef(IUnknown *pUnk)
 134 {
 135     return 1;
 136 }
 137
 138 static ULONG WINAPI delegating_Release(IUnknown *pUnk)
 139 {
 140     return 1;
 141 }
 142
 143 #if defined(__i386__)
 144
 145 /* The idea here is to replace the first param on the stack
 146    ie. This (which will point to cstdstubbuffer_delegating_t)
 147    with This->stub_buffer.pvServerObject and then jump to the
 148    relevant offset in This->stub_buffer.pvServerObject's vtbl.
 149 */
 150 #include "pshpack1.h"
 151 typedef struct {
 152     DWORD mov1;    /* mov 0x4(%esp), %eax      8b 44 24 04 */
 153     WORD mov2;     /* mov 0x10(%eax), %eax     8b 40 */
 154     BYTE sixteen;  /*                          10   */
 155     DWORD mov3;    /* mov %eax, 0x4(%esp)      89 44 24 04 */
 156     WORD mov4;     /* mov (%eax), %eax         8b 00 */
 157     WORD mov5;     /* mov offset(%eax), %eax   8b 80 */
 158     DWORD offset;  /*                          xx xx xx xx */
 159     WORD jmp;      /* jmp *%eax                ff e0 */
 160     BYTE pad[3];   /* lea 0x0(%esi), %esi      8d 76 00 */
 161 } vtbl_method_t;
 162 #include "poppack.h"
 163
 164 static void fill_table(IUnknownVtbl *vtbl, void **methods, DWORD num)
 165 {
 166     vtbl_method_t *method;
 167     void **entry;
 168     DWORD i;
 169
 170     vtbl->QueryInterface = delegating_QueryInterface;
 171     vtbl->AddRef = delegating_AddRef;
 172     vtbl->Release = delegating_Release;
 173
 174     method = (vtbl_method_t*)methods;
 175     entry = (void**)(vtbl + 1);
 176
 177     for(i = 3; i < num; i++)
 178     {
 179         *entry = method;
 180         method->mov1 = 0x0424448b;
 181         method->mov2 = 0x408b;
 182         method->sixteen = 0x10;
 183         method->mov3 = 0x04244489;
 184         method->mov4 = 0x008b;
 185         method->mov5 = 0x808b;
 186         method->offset = i << 2;
 187         method->jmp = 0xe0ff;
 188         method->pad[0] = 0x8d;
 189         method->pad[1] = 0x76;
 190         method->pad[2] = 0x00;
 191
 192         method++;
 193         entry++;
 194     }
 195 }
 196
 197 #else  /* __i386__ */
 198
 199 typedef struct {int dummy;} vtbl_method_t;
 200 static void fill_table(IUnknownVtbl *vtbl, void **methods, DWORD num)
 201 {
 202     ERR("delegated stubs are not supported on this architecture\n");
 203 }
 204
 205 #endif  /* __i386__ */
 206
 207 void create_delegating_vtbl(DWORD num_methods)
 208 {
 209     TRACE("%d\n", num_methods);
 210     if(num_methods <= 3)
 211     {
 212         ERR("should have more than %d methods\n", num_methods);
 213         return;
 214     }
 215
 216     EnterCriticalSection(&delegating_vtbl_section);
 217     if(!current_vtbl.table || num_methods > current_vtbl.table->size)
 218     {
 219         DWORD size;
 220         DWORD old_protect;
 221         if(current_vtbl.table && current_vtbl.table->ref == 0)
 222         {
 223             TRACE("freeing old table\n");
 224             VirtualFree(current_vtbl.table->methods, 0, MEM_RELEASE);
 225             HeapFree(GetProcessHeap(), 0, current_vtbl.table);
 226         }
 227         size = (num_methods - 3) * sizeof(vtbl_method_t);
 228         current_vtbl.table = HeapAlloc(GetProcessHeap(), 0, FIELD_OFFSET(ref_counted_vtbl, vtbl) + num_methods * sizeof(void*));
 229         current_vtbl.table->ref = 0;
 230         current_vtbl.table->size = num_methods;
 231         current_vtbl.table->methods = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
 232         fill_table(&current_vtbl.table->vtbl, current_vtbl.table->methods, num_methods);
 233         VirtualProtect(current_vtbl.table->methods, size, PAGE_EXECUTE_READ, &old_protect);
 234     }
 235     LeaveCriticalSection(&delegating_vtbl_section);
 236 }
 237
 238 static IUnknownVtbl *get_delegating_vtbl(void)
 239 {
 240     IUnknownVtbl *ret;
 241
 242     EnterCriticalSection(&delegating_vtbl_section);
 243     current_vtbl.table->ref++;
 244     ret = &current_vtbl.table->vtbl;
 245     LeaveCriticalSection(&delegating_vtbl_section);
 246     return ret;
 247 }
 248
 249 static void release_delegating_vtbl(IUnknownVtbl *vtbl)
 250 {
 251     ref_counted_vtbl *table = (ref_counted_vtbl*)((DWORD *)vtbl - 1);
 252
 253     EnterCriticalSection(&delegating_vtbl_section);
 254     table->ref--;
 255     TRACE("ref now %d\n", table->ref);
 256     if(table->ref == 0 && table != current_vtbl.table)
 257     {
 258         TRACE("... and we're not current so free'ing\n");
 259         VirtualFree(current_vtbl.table->methods, 0, MEM_RELEASE);
 260         HeapFree(GetProcessHeap(), 0, table);
 261     }
 262     LeaveCriticalSection(&delegating_vtbl_section);
 263 }
 264
 265 HRESULT WINAPI CStdStubBuffer_Delegating_Construct(REFIID riid,
 266                                                    LPUNKNOWN pUnkServer,
 267                                                    PCInterfaceName name,
 268                                                    CInterfaceStubVtbl *vtbl,
 269                                                    REFIID delegating_iid,
 270                                                    LPPSFACTORYBUFFER pPSFactory,
 271                                                    LPRPCSTUBBUFFER *ppStub)
 272 {
 273     cstdstubbuffer_delegating_t *This;
 274     IUnknown *pvServer;
 275     HRESULT r;
 276
 277     TRACE("(%p,%p,%p,%p) %s\n", pUnkServer, vtbl, pPSFactory, ppStub, name);
 278     TRACE("iid=%s delegating to %s\n", debugstr_guid(vtbl->header.piid), debugstr_guid(delegating_iid));
 279     TRACE("vtbl=%p\n", &vtbl->Vtbl);
 280
 281     if (!IsEqualGUID(vtbl->header.piid, riid))
 282     {
 283         ERR("IID mismatch during stub creation\n");
 284         return RPC_E_UNEXPECTED;
 285     }
 286
 287     r = IUnknown_QueryInterface(pUnkServer, riid, (void**)&pvServer);
 288     if(FAILED(r)) return r;
 289
 290     This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*This));
 291     if (!This)
 292     {
 293         IUnknown_Release(pvServer);
 294         return E_OUTOFMEMORY;
 295     }
 296
 297     This->base_obj = get_delegating_vtbl();
 298     r = create_stub(delegating_iid, (IUnknown*)&This->base_obj, &This->base_stub);
 299     if(FAILED(r))
 300     {
 301         release_delegating_vtbl(This->base_obj);
 302         HeapFree(GetProcessHeap(), 0, This);
 303         IUnknown_Release(pvServer);
 304         return r;
 305     }
 306
 307     This->stub_buffer.lpVtbl = &vtbl->Vtbl;
 308     This->stub_buffer.RefCount = 1;
 309     This->stub_buffer.pvServerObject = pvServer;
 310     This->stub_buffer.pPSFactory = pPSFactory;
 311     *ppStub = (LPRPCSTUBBUFFER)&This->stub_buffer;
 312
 313     IPSFactoryBuffer_AddRef(pPSFactory);
 314     return S_OK;
 315 }
 316
 317 HRESULT WINAPI CStdStubBuffer_QueryInterface(LPRPCSTUBBUFFER iface,
 318                                             REFIID riid,
 319                                             LPVOID *obj)
 320 {
 321   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 322   TRACE("(%p)->QueryInterface(%s,%p)\n",This,debugstr_guid(riid),obj);
 323
 324   if (IsEqualIID(&IID_IUnknown, riid) ||
 325       IsEqualIID(&IID_IRpcStubBuffer, riid))
 326   {
 327     IUnknown_AddRef(iface);
 328     *obj = iface;
 329     return S_OK;
 330   }
 331   *obj = NULL;
 332   return E_NOINTERFACE;
 333 }
 334
 335 ULONG WINAPI CStdStubBuffer_AddRef(LPRPCSTUBBUFFER iface)
 336 {
 337   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 338   TRACE("(%p)->AddRef()\n",This);
 339   return InterlockedIncrement(&This->RefCount);
 340 }
 341
 342 ULONG WINAPI NdrCStdStubBuffer_Release(LPRPCSTUBBUFFER iface,
 343                                       LPPSFACTORYBUFFER pPSF)
 344 {
 345   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 346   ULONG refs;
 347
 348   TRACE("(%p)->Release()\n",This);
 349
 350   refs = InterlockedDecrement(&This->RefCount);
 351   if (!refs)
 352   {
 353     /* test_Release shows that native doesn't call Disconnect here.
 354        We'll leave it in for the time being. */
 355     IRpcStubBuffer_Disconnect(iface);
 356
 357     IPSFactoryBuffer_Release(pPSF);
 358     HeapFree(GetProcessHeap(),0,This);
 359   }
 360   return refs;
 361 }
 362
 363 ULONG WINAPI NdrCStdStubBuffer2_Release(LPRPCSTUBBUFFER iface,
 364                                         LPPSFACTORYBUFFER pPSF)
 365 {
 366     cstdstubbuffer_delegating_t *This = impl_from_delegating( iface );
 367     ULONG refs;
 368
 369     TRACE("(%p)->Release()\n", This);
 370
 371     refs = InterlockedDecrement(&This->stub_buffer.RefCount);
 372     if (!refs)
 373     {
 374         /* Just like NdrCStdStubBuffer_Release, we shouldn't call
 375            Disconnect here */
 376         IRpcStubBuffer_Disconnect((IRpcStubBuffer *)&This->stub_buffer);
 377
 378         IRpcStubBuffer_Release(This->base_stub);
 379         release_delegating_vtbl(This->base_obj);
 380
 381         IPSFactoryBuffer_Release(pPSF);
 382         HeapFree(GetProcessHeap(), 0, This);
 383     }
 384
 385     return refs;
 386 }
 387
 388 HRESULT WINAPI CStdStubBuffer_Connect(LPRPCSTUBBUFFER iface,
 389                                      LPUNKNOWN lpUnkServer)
 390 {
 391     CStdStubBuffer *This = (CStdStubBuffer *)iface;
 392     HRESULT r;
 393     IUnknown *new = NULL;
 394
 395     TRACE("(%p)->Connect(%p)\n",This,lpUnkServer);
 396
 397     r = IUnknown_QueryInterface(lpUnkServer, STUB_HEADER(This).piid, (void**)&new);
 398     new = InterlockedExchangePointer((void**)&This->pvServerObject, new);
 399     if(new)
 400         IUnknown_Release(new);
 401     return r;
 402 }
 403
 404 void WINAPI CStdStubBuffer_Disconnect(LPRPCSTUBBUFFER iface)
 405 {
 406     CStdStubBuffer *This = (CStdStubBuffer *)iface;
 407     IUnknown *old;
 408     TRACE("(%p)->Disconnect()\n",This);
 409
 410     old = InterlockedExchangePointer((void**)&This->pvServerObject, NULL);
 411
 412     if(old)
 413         IUnknown_Release(old);
 414 }
 415
 416 HRESULT WINAPI CStdStubBuffer_Invoke(LPRPCSTUBBUFFER iface,
 417                                     PRPCOLEMESSAGE pMsg,
 418                                     LPRPCCHANNELBUFFER pChannel)
 419 {
 420   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 421   DWORD dwPhase = STUB_UNMARSHAL;
 422   HRESULT hr = S_OK;
 423
 424   TRACE("(%p)->Invoke(%p,%p)\n",This,pMsg,pChannel);
 425
 426   __TRY
 427   {
 428     if (STUB_HEADER(This).pDispatchTable)
 429       STUB_HEADER(This).pDispatchTable[pMsg->iMethod](iface, pChannel, (PRPC_MESSAGE)pMsg, &dwPhase);
 430     else /* pure interpreted */
 431       NdrStubCall2(iface, pChannel, (PRPC_MESSAGE)pMsg, &dwPhase);
 432   }
 433   __EXCEPT(stub_filter)
 434   {
 435     DWORD dwExceptionCode = GetExceptionCode();
 436     WARN("a stub call failed with exception 0x%08x (%d)\n", dwExceptionCode, dwExceptionCode);
 437     if (FAILED(dwExceptionCode))
 438       hr = dwExceptionCode;
 439     else
 440       hr = HRESULT_FROM_WIN32(dwExceptionCode);
 441   }
 442   __ENDTRY
 443
 444   return hr;
 445 }
 446
 447 LPRPCSTUBBUFFER WINAPI CStdStubBuffer_IsIIDSupported(LPRPCSTUBBUFFER iface,
 448                                                     REFIID riid)
 449 {
 450   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 451   TRACE("(%p)->IsIIDSupported(%s)\n",This,debugstr_guid(riid));
 452   return IsEqualGUID(STUB_HEADER(This).piid, riid) ? iface : NULL;
 453 }
 454
 455 ULONG WINAPI CStdStubBuffer_CountRefs(LPRPCSTUBBUFFER iface)
 456 {
 457   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 458   TRACE("(%p)->CountRefs()\n",This);
 459   return This->RefCount;
 460 }
 461
 462 HRESULT WINAPI CStdStubBuffer_DebugServerQueryInterface(LPRPCSTUBBUFFER iface,
 463                                                        LPVOID *ppv)
 464 {
 465   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 466   TRACE("(%p)->DebugServerQueryInterface(%p)\n",This,ppv);
 467   return S_OK;
 468 }
 469
 470 void WINAPI CStdStubBuffer_DebugServerRelease(LPRPCSTUBBUFFER iface,
 471                                              LPVOID pv)
 472 {
 473   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 474   TRACE("(%p)->DebugServerRelease(%p)\n",This,pv);
 475 }
 476
 477 const IRpcStubBufferVtbl CStdStubBuffer_Vtbl =
 478 {
 479     CStdStubBuffer_QueryInterface,
 480     CStdStubBuffer_AddRef,
 481     NULL,
 482     CStdStubBuffer_Connect,
 483     CStdStubBuffer_Disconnect,
 484     CStdStubBuffer_Invoke,
 485     CStdStubBuffer_IsIIDSupported,
 486     CStdStubBuffer_CountRefs,
 487     CStdStubBuffer_DebugServerQueryInterface,
 488     CStdStubBuffer_DebugServerRelease
 489 };
 490
 491 static HRESULT WINAPI CStdStubBuffer_Delegating_Connect(LPRPCSTUBBUFFER iface,
 492                                                         LPUNKNOWN lpUnkServer)
 493 {
 494     cstdstubbuffer_delegating_t *This = impl_from_delegating(iface);
 495     HRESULT r;
 496     TRACE("(%p)->Connect(%p)\n", This, lpUnkServer);
 497
 498     r = CStdStubBuffer_Connect(iface, lpUnkServer);
 499     if(SUCCEEDED(r))
 500         r = IRpcStubBuffer_Connect(This->base_stub, (IUnknown*)&This->base_obj);
 501
 502     return r;
 503 }
 504
 505 static void WINAPI CStdStubBuffer_Delegating_Disconnect(LPRPCSTUBBUFFER iface)
 506 {
 507     cstdstubbuffer_delegating_t *This = impl_from_delegating(iface);
 508     TRACE("(%p)->Disconnect()\n", This);
 509
 510     IRpcStubBuffer_Disconnect(This->base_stub);
 511     CStdStubBuffer_Disconnect(iface);
 512 }
 513
 514 static ULONG WINAPI CStdStubBuffer_Delegating_CountRefs(LPRPCSTUBBUFFER iface)
 515 {
 516     cstdstubbuffer_delegating_t *This = impl_from_delegating(iface);
 517     ULONG ret;
 518     TRACE("(%p)->CountRefs()\n", This);
 519
 520     ret = CStdStubBuffer_CountRefs(iface);
 521     ret += IRpcStubBuffer_CountRefs(This->base_stub);
 522
 523     return ret;
 524 }
 525
 526 const IRpcStubBufferVtbl CStdStubBuffer_Delegating_Vtbl =
 527 {
 528     CStdStubBuffer_QueryInterface,
 529     CStdStubBuffer_AddRef,
 530     NULL,
 531     CStdStubBuffer_Delegating_Connect,
 532     CStdStubBuffer_Delegating_Disconnect,
 533     CStdStubBuffer_Invoke,
 534     CStdStubBuffer_IsIIDSupported,
 535     CStdStubBuffer_Delegating_CountRefs,
 536     CStdStubBuffer_DebugServerQueryInterface,
 537     CStdStubBuffer_DebugServerRelease
 538 };
 539
 540 const MIDL_SERVER_INFO *CStdStubBuffer_GetServerInfo(IRpcStubBuffer *iface)
 541 {
 542   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 543   return STUB_HEADER(This).pServerInfo;
 544 }
 545
 546 /************************************************************************
 547  *           NdrStubForwardingFunction [RPCRT4.@]
 548  */
 549 void __RPC_STUB NdrStubForwardingFunction( IRpcStubBuffer *iface, IRpcChannelBuffer *pChannel,
 550                                            PRPC_MESSAGE pMsg, DWORD *pdwStubPhase )
 551 {
 552     /* Note pMsg is passed intact since RPCOLEMESSAGE is basically a RPC_MESSAGE. */
 553
 554     cstdstubbuffer_delegating_t *This = impl_from_delegating(iface);
 555     HRESULT r = IRpcStubBuffer_Invoke(This->base_stub, (RPCOLEMESSAGE*)pMsg, pChannel);
 556     if(FAILED(r)) RpcRaiseException(r);
 557     return;
 558 }
 559
 560 /***********************************************************************
 561  *           NdrStubInitialize [RPCRT4.@]
 562  */
 563 void WINAPI NdrStubInitialize(PRPC_MESSAGE pRpcMsg,
 564                              PMIDL_STUB_MESSAGE pStubMsg,
 565                              PMIDL_STUB_DESC pStubDescriptor,
 566                              LPRPCCHANNELBUFFER pRpcChannelBuffer)
 567 {
 568   TRACE("(%p,%p,%p,%p)\n", pRpcMsg, pStubMsg, pStubDescriptor, pRpcChannelBuffer);
 569   NdrServerInitializeNew(pRpcMsg, pStubMsg, pStubDescriptor);
 570   pStubMsg->pRpcChannelBuffer = pRpcChannelBuffer;
 571   IRpcChannelBuffer_GetDestCtx(pStubMsg->pRpcChannelBuffer,
 572                                &pStubMsg->dwDestContext,
 573                                &pStubMsg->pvDestContext);
 574 }
 575
 576 /***********************************************************************
 577  *           NdrStubGetBuffer [RPCRT4.@]
 578  */
 579 void WINAPI NdrStubGetBuffer(LPRPCSTUBBUFFER iface,
 580                             LPRPCCHANNELBUFFER pRpcChannelBuffer,
 581                             PMIDL_STUB_MESSAGE pStubMsg)
 582 {
 583   CStdStubBuffer *This = (CStdStubBuffer *)iface;
 584   HRESULT hr;
 585
 586   TRACE("(%p, %p, %p)\n", This, pRpcChannelBuffer, pStubMsg);
 587
 588   pStubMsg->RpcMsg->BufferLength = pStubMsg->BufferLength;
 589   hr = IRpcChannelBuffer_GetBuffer(pRpcChannelBuffer,
 590     (RPCOLEMESSAGE *)pStubMsg->RpcMsg, STUB_HEADER(This).piid);
 591   if (FAILED(hr))
 592   {
 593     RpcRaiseException(hr);
 594     return;
 595   }
 596
 597   pStubMsg->Buffer = pStubMsg->RpcMsg->Buffer;
 598 }