dlls/shlwapi/istream.c

   1 /*
   2  * SHLWAPI IStream functions
   3  *
   4  * Copyright 2002 Jon Griffiths
   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 #include <stdarg.h>
  21 #include <string.h>
  22
  23 #define COBJMACROS
  24 #define NONAMELESSUNION
  25 #define NONAMELESSSTRUCT
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winerror.h"
  30 #include "winnls.h"
  31 #define NO_SHLWAPI_REG
  32 #define NO_SHLWAPI_PATH
  33 #include "shlwapi.h"
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  37
  38 #define STGM_ACCESS_MODE(stgm)   ((stgm)&0x0000f)
  39 #define STGM_SHARE_MODE(stgm)    ((stgm)&0x000f0)
  40 #define STGM_CREATE_MODE(stgm)   ((stgm)&0x0f000)
  41
  42 /* Layout of ISHFileStream object */
  43 typedef struct
  44 {
  45   IStream  IStream_iface;
  46   LONG     ref;
  47   HANDLE   hFile;
  48   DWORD    dwMode;
  49   LPOLESTR lpszPath;
  50   DWORD    type;
  51   DWORD    grfStateBits;
  52 } ISHFileStream;
  53
  54 static inline ISHFileStream *impl_from_IStream(IStream *iface)
  55 {
  56   return CONTAINING_RECORD(iface, ISHFileStream, IStream_iface);
  57 }
  58
  59 static HRESULT WINAPI IStream_fnCommit(IStream*,DWORD);
  60
  61
  62 /**************************************************************************
  63 *  IStream_fnQueryInterface
  64 */
  65 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
  66 {
  67   ISHFileStream *This = impl_from_IStream(iface);
  68
  69   TRACE("(%p,%s,%p)\n", This, debugstr_guid(riid), ppvObj);
  70
  71   *ppvObj = NULL;
  72
  73   if(IsEqualIID(riid, &IID_IUnknown) ||
  74      IsEqualIID(riid, &IID_IStream))
  75   {
  76     IStream_AddRef(iface);
  77     *ppvObj = iface;
  78     return S_OK;
  79   }
  80   return E_NOINTERFACE;
  81 }
  82
  83 /**************************************************************************
  84 *  IStream_fnAddRef
  85 */
  86 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
  87 {
  88   ISHFileStream *This = impl_from_IStream(iface);
  89   ULONG refCount = InterlockedIncrement(&This->ref);
  90
  91   TRACE("(%p)->(ref before=%u)\n",This, refCount - 1);
  92
  93   return refCount;
  94 }
  95
  96 /**************************************************************************
  97 *  IStream_fnRelease
  98 */
  99 static ULONG WINAPI IStream_fnRelease(IStream *iface)
 100 {
 101   ISHFileStream *This = impl_from_IStream(iface);
 102   ULONG refCount = InterlockedDecrement(&This->ref);
 103
 104   TRACE("(%p)->(ref before=%u)\n",This, refCount + 1);
 105
 106   if (!refCount)
 107   {
 108     IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 109     LocalFree(This->lpszPath);
 110     CloseHandle(This->hFile);
 111     HeapFree(GetProcessHeap(), 0, This);
 112   }
 113
 114   return refCount;
 115 }
 116
 117 /**************************************************************************
 118  * IStream_fnRead
 119  */
 120 static HRESULT WINAPI IStream_fnRead(IStream *iface, void* pv, ULONG cb, ULONG* pcbRead)
 121 {
 122   ISHFileStream *This = impl_from_IStream(iface);
 123   DWORD dwRead = 0;
 124
 125   TRACE("(%p,%p,0x%08x,%p)\n", This, pv, cb, pcbRead);
 126
 127   if (!ReadFile(This->hFile, pv, cb, &dwRead, NULL))
 128   {
 129     WARN("error %d reading file\n", GetLastError());
 130     return S_FALSE;
 131   }
 132   if (pcbRead)
 133     *pcbRead = dwRead;
 134   return S_OK;
 135 }
 136
 137 /**************************************************************************
 138  * IStream_fnWrite
 139  */
 140 static HRESULT WINAPI IStream_fnWrite(IStream *iface, const void* pv, ULONG cb, ULONG* pcbWritten)
 141 {
 142   ISHFileStream *This = impl_from_IStream(iface);
 143   DWORD dwWritten = 0;
 144
 145   TRACE("(%p,%p,0x%08x,%p)\n", This, pv, cb, pcbWritten);
 146
 147   switch (STGM_ACCESS_MODE(This->dwMode))
 148   {
 149   case STGM_WRITE:
 150   case STGM_READWRITE:
 151     break;
 152   default:
 153     return STG_E_ACCESSDENIED;
 154   }
 155
 156   if (!WriteFile(This->hFile, pv, cb, &dwWritten, NULL))
 157     return HRESULT_FROM_WIN32(GetLastError());
 158
 159   if (pcbWritten)
 160     *pcbWritten = dwWritten;
 161   return S_OK;
 162 }
 163
 164 /**************************************************************************
 165  *  IStream_fnSeek
 166  */
 167 static HRESULT WINAPI IStream_fnSeek(IStream *iface, LARGE_INTEGER dlibMove,
 168                                      DWORD dwOrigin, ULARGE_INTEGER* pNewPos)
 169 {
 170   ISHFileStream *This = impl_from_IStream(iface);
 171   DWORD dwPos;
 172
 173   TRACE("(%p,%d,%d,%p)\n", This, dlibMove.u.LowPart, dwOrigin, pNewPos);
 174
 175   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 176   dwPos = SetFilePointer(This->hFile, dlibMove.u.LowPart, NULL, dwOrigin);
 177   if( dwPos == INVALID_SET_FILE_POINTER )
 178      return HRESULT_FROM_WIN32(GetLastError());
 179
 180   if (pNewPos)
 181   {
 182     pNewPos->u.HighPart = 0;
 183     pNewPos->u.LowPart = dwPos;
 184   }
 185   return S_OK;
 186 }
 187
 188 /**************************************************************************
 189  * IStream_fnSetSize
 190  */
 191 static HRESULT WINAPI IStream_fnSetSize(IStream *iface, ULARGE_INTEGER libNewSize)
 192 {
 193   ISHFileStream *This = impl_from_IStream(iface);
 194
 195   TRACE("(%p,%d)\n", This, libNewSize.u.LowPart);
 196
 197   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 198   if( ! SetFilePointer( This->hFile, libNewSize.QuadPart, NULL, FILE_BEGIN ) )
 199     return E_FAIL;
 200
 201   if( ! SetEndOfFile( This->hFile ) )
 202     return E_FAIL;
 203
 204   return S_OK;
 205 }
 206
 207 /**************************************************************************
 208  * IStream_fnCopyTo
 209  */
 210 static HRESULT WINAPI IStream_fnCopyTo(IStream *iface, IStream* pstm, ULARGE_INTEGER cb,
 211                                        ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
 212 {
 213   ISHFileStream *This = impl_from_IStream(iface);
 214   char copyBuff[1024];
 215   ULONGLONG ulSize;
 216   HRESULT hRet = S_OK;
 217
 218   TRACE("(%p,%p,%d,%p,%p)\n", This, pstm, cb.u.LowPart, pcbRead, pcbWritten);
 219
 220   if (pcbRead)
 221     pcbRead->QuadPart = 0;
 222   if (pcbWritten)
 223     pcbWritten->QuadPart = 0;
 224
 225   if (!pstm)
 226     return S_OK;
 227
 228   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 229
 230   /* Copy data */
 231   ulSize = cb.QuadPart;
 232   while (ulSize)
 233   {
 234     ULONG ulLeft, ulRead, ulWritten;
 235
 236     ulLeft = ulSize > sizeof(copyBuff) ? sizeof(copyBuff) : ulSize;
 237
 238     /* Read */
 239     hRet = IStream_fnRead(iface, copyBuff, ulLeft, &ulRead);
 240     if (FAILED(hRet) || ulRead == 0)
 241       break;
 242     if (pcbRead)
 243       pcbRead->QuadPart += ulRead;
 244
 245     /* Write */
 246     hRet = IStream_fnWrite(pstm, copyBuff, ulRead, &ulWritten);
 247     if (pcbWritten)
 248       pcbWritten->QuadPart += ulWritten;
 249     if (FAILED(hRet) || ulWritten != ulLeft)
 250       break;
 251
 252     ulSize -= ulLeft;
 253   }
 254   return hRet;
 255 }
 256
 257 /**************************************************************************
 258  * IStream_fnCommit
 259  */
 260 static HRESULT WINAPI IStream_fnCommit(IStream *iface, DWORD grfCommitFlags)
 261 {
 262   ISHFileStream *This = impl_from_IStream(iface);
 263
 264   TRACE("(%p,%d)\n", This, grfCommitFlags);
 265   /* Currently unbuffered: This function is not needed */
 266   return S_OK;
 267 }
 268
 269 /**************************************************************************
 270  * IStream_fnRevert
 271  */
 272 static HRESULT WINAPI IStream_fnRevert(IStream *iface)
 273 {
 274   ISHFileStream *This = impl_from_IStream(iface);
 275
 276   TRACE("(%p)\n", This);
 277   return E_NOTIMPL;
 278 }
 279
 280 /**************************************************************************
 281  * IStream_fnLockUnlockRegion
 282  */
 283 static HRESULT WINAPI IStream_fnLockUnlockRegion(IStream *iface, ULARGE_INTEGER libOffset,
 284                                                  ULARGE_INTEGER cb, DWORD dwLockType)
 285 {
 286   ISHFileStream *This = impl_from_IStream(iface);
 287   TRACE("(%p,%d,%d,%d)\n", This, libOffset.u.LowPart, cb.u.LowPart, dwLockType);
 288   return E_NOTIMPL;
 289 }
 290
 291 /*************************************************************************
 292  * IStream_fnStat
 293  */
 294 static HRESULT WINAPI IStream_fnStat(IStream *iface, STATSTG* lpStat,
 295                                      DWORD grfStatFlag)
 296 {
 297     ISHFileStream *This = impl_from_IStream(iface);
 298     BY_HANDLE_FILE_INFORMATION fi;
 299
 300     TRACE("(%p,%p,%d)\n", This, lpStat, grfStatFlag);
 301
 302     if (!grfStatFlag)
 303         return STG_E_INVALIDPOINTER;
 304
 305     memset(&fi, 0, sizeof(fi));
 306     GetFileInformationByHandle(This->hFile, &fi);
 307
 308     if (grfStatFlag & STATFLAG_NONAME)
 309       lpStat->pwcsName = NULL;
 310     else
 311       lpStat->pwcsName = StrDupW(This->lpszPath);
 312     lpStat->type = This->type;
 313     lpStat->cbSize.u.LowPart = fi.nFileSizeLow;
 314     lpStat->cbSize.u.HighPart = fi.nFileSizeHigh;
 315     lpStat->mtime = fi.ftLastWriteTime;
 316     lpStat->ctime = fi.ftCreationTime;
 317     lpStat->atime = fi.ftLastAccessTime;
 318     lpStat->grfMode = This->dwMode;
 319     lpStat->grfLocksSupported = 0;
 320     memcpy(&lpStat->clsid, &IID_IStream, sizeof(CLSID));
 321     lpStat->grfStateBits = This->grfStateBits;
 322     lpStat->reserved = 0;
 323
 324     return S_OK;
 325 }
 326
 327 /*************************************************************************
 328  * IStream_fnClone
 329  */
 330 static HRESULT WINAPI IStream_fnClone(IStream *iface, IStream** ppstm)
 331 {
 332   ISHFileStream *This = impl_from_IStream(iface);
 333
 334   TRACE("(%p)\n",This);
 335   if (ppstm)
 336     *ppstm = NULL;
 337   return E_NOTIMPL;
 338 }
 339
 340 static const IStreamVtbl SHLWAPI_fsVTable =
 341 {
 342   IStream_fnQueryInterface,
 343   IStream_fnAddRef,
 344   IStream_fnRelease,
 345   IStream_fnRead,
 346   IStream_fnWrite,
 347   IStream_fnSeek,
 348   IStream_fnSetSize,
 349   IStream_fnCopyTo,
 350   IStream_fnCommit,
 351   IStream_fnRevert,
 352   IStream_fnLockUnlockRegion,
 353   IStream_fnLockUnlockRegion,
 354   IStream_fnStat,
 355   IStream_fnClone
 356 };
 357
 358 /**************************************************************************
 359  * IStream_Create
 360  *
 361  * Internal helper: Create and initialise a new file stream object.
 362  */
 363 static IStream *IStream_Create(LPCWSTR lpszPath, HANDLE hFile, DWORD dwMode)
 364 {
 365     ISHFileStream *fileStream;
 366
 367     fileStream = HeapAlloc(GetProcessHeap(), 0, sizeof(ISHFileStream));
 368     if (!fileStream) return NULL;
 369
 370     fileStream->IStream_iface.lpVtbl = &SHLWAPI_fsVTable;
 371     fileStream->ref = 1;
 372     fileStream->hFile = hFile;
 373     fileStream->dwMode = dwMode;
 374     fileStream->lpszPath = StrDupW(lpszPath);
 375     fileStream->type = 0; /* FIXME */
 376     fileStream->grfStateBits = 0; /* FIXME */
 377
 378     TRACE ("Returning %p\n", fileStream);
 379     return &fileStream->IStream_iface;
 380 }
 381
 382 /*************************************************************************
 383  * SHCreateStreamOnFileEx   [SHLWAPI.@]
 384  *
 385  * Create a stream on a file.
 386  *
 387  * PARAMS
 388  *  lpszPath     [I] Path of file to create stream on
 389  *  dwMode       [I] Mode to create stream in
 390  *  dwAttributes [I] Attributes of the file
 391  *  bCreate      [I] Whether to create the file if it doesn't exist
 392  *  lpTemplate   [I] Reserved, must be NULL
 393  *  lppStream    [O] Destination for created stream
 394  *
 395  * RETURNS
 396  * Success: S_OK. lppStream contains the new stream object
 397  * Failure: E_INVALIDARG if any parameter is invalid, or an HRESULT error code
 398  *
 399  * NOTES
 400  *  This function is available in Unicode only.
 401  */
 402 HRESULT WINAPI SHCreateStreamOnFileEx(LPCWSTR lpszPath, DWORD dwMode,
 403                                       DWORD dwAttributes, BOOL bCreate,
 404                                       IStream *lpTemplate, IStream **lppStream)
 405 {
 406   DWORD dwAccess, dwShare, dwCreate;
 407   HANDLE hFile;
 408
 409   TRACE("(%s,%d,0x%08X,%d,%p,%p)\n", debugstr_w(lpszPath), dwMode,
 410         dwAttributes, bCreate, lpTemplate, lppStream);
 411
 412   if (!lpszPath || !lppStream || lpTemplate)
 413     return E_INVALIDARG;
 414
 415   *lppStream = NULL;
 416
 417   /* Access */
 418   switch (STGM_ACCESS_MODE(dwMode))
 419   {
 420   case STGM_WRITE:
 421   case STGM_READWRITE:
 422     dwAccess = GENERIC_READ|GENERIC_WRITE;
 423     break;
 424   case STGM_READ:
 425     dwAccess = GENERIC_READ;
 426     break;
 427   default:
 428     return E_INVALIDARG;
 429   }
 430
 431   /* Sharing */
 432   switch (STGM_SHARE_MODE(dwMode))
 433   {
 434   case 0:
 435   case STGM_SHARE_DENY_NONE:
 436     dwShare = FILE_SHARE_READ|FILE_SHARE_WRITE;
 437     break;
 438   case STGM_SHARE_DENY_READ:
 439     dwShare = FILE_SHARE_WRITE;
 440     break;
 441   case STGM_SHARE_DENY_WRITE:
 442     dwShare = FILE_SHARE_READ;
 443     break;
 444   case STGM_SHARE_EXCLUSIVE:
 445     dwShare = 0;
 446     break;
 447   default:
 448     return E_INVALIDARG;
 449   }
 450
 451   switch(STGM_CREATE_MODE(dwMode))
 452   {
 453   case STGM_FAILIFTHERE:
 454     dwCreate = bCreate ? CREATE_NEW : OPEN_EXISTING;
 455     break;
 456   case STGM_CREATE:
 457     dwCreate = CREATE_ALWAYS;
 458     break;
 459   default:
 460     return E_INVALIDARG;
 461   }
 462
 463   /* Open HANDLE to file */
 464   hFile = CreateFileW(lpszPath, dwAccess, dwShare, NULL, dwCreate,
 465                       dwAttributes, 0);
 466
 467   if(hFile == INVALID_HANDLE_VALUE)
 468     return HRESULT_FROM_WIN32(GetLastError());
 469
 470   *lppStream = IStream_Create(lpszPath, hFile, dwMode);
 471
 472   if(!*lppStream)
 473   {
 474     CloseHandle(hFile);
 475     return E_OUTOFMEMORY;
 476   }
 477   return S_OK;
 478 }
 479
 480 /*************************************************************************
 481  * SHCreateStreamOnFileW   [SHLWAPI.@]
 482  *
 483  * See SHCreateStreamOnFileA.
 484  */
 485 HRESULT WINAPI SHCreateStreamOnFileW(LPCWSTR lpszPath, DWORD dwMode,
 486                                    IStream **lppStream)
 487 {
 488   TRACE("(%s,%d,%p)\n", debugstr_w(lpszPath), dwMode, lppStream);
 489
 490   if (!lpszPath || !lppStream)
 491     return E_INVALIDARG;
 492
 493   if ((dwMode & (STGM_CONVERT|STGM_DELETEONRELEASE|STGM_TRANSACTED)) != 0)
 494     return E_INVALIDARG;
 495
 496   return SHCreateStreamOnFileEx(lpszPath, dwMode, 0, FALSE, NULL, lppStream);
 497 }
 498
 499 /*************************************************************************
 500  * SHCreateStreamOnFileA   [SHLWAPI.@]
 501  *
 502  * Create a stream on a file.
 503  *
 504  * PARAMS
 505  *  lpszPath  [I] Path of file to create stream on
 506  *  dwMode    [I] Mode to create stream in
 507  *  lppStream [O] Destination for created IStream object
 508  *
 509  * RETURNS
 510  * Success: S_OK. lppStream contains the new IStream object
 511  * Failure: E_INVALIDARG if any parameter is invalid, or an HRESULT error code
 512  */
 513 HRESULT WINAPI SHCreateStreamOnFileA(LPCSTR lpszPath, DWORD dwMode,
 514                                      IStream **lppStream)
 515 {
 516   WCHAR szPath[MAX_PATH];
 517
 518   TRACE("(%s,%d,%p)\n", debugstr_a(lpszPath), dwMode, lppStream);
 519
 520   if (!lpszPath)
 521     return HRESULT_FROM_WIN32(ERROR_PATH_NOT_FOUND);
 522
 523   MultiByteToWideChar(CP_ACP, 0, lpszPath, -1, szPath, MAX_PATH);
 524   return SHCreateStreamOnFileW(szPath, dwMode, lppStream);
 525 }
 526
 527 /*************************************************************************
 528  * @       [SHLWAPI.184]
 529  *
 530  * Call IStream_Read() on a stream.
 531  *
 532  * PARAMS
 533  *  lpStream [I] IStream object
 534  *  lpvDest  [O] Destination for data read
 535  *  ulSize   [I] Size of data to read
 536  *
 537  * RETURNS
 538  *  Success: S_OK. ulSize bytes have been read from the stream into lpvDest.
 539  *  Failure: An HRESULT error code, or E_FAIL if the read succeeded but the
 540  *           number of bytes read does not match.
 541  */
 542 HRESULT WINAPI SHIStream_Read(IStream *lpStream, LPVOID lpvDest, ULONG ulSize)
 543 {
 544   ULONG ulRead;
 545   HRESULT hRet;
 546
 547   TRACE("(%p,%p,%d)\n", lpStream, lpvDest, ulSize);
 548
 549   hRet = IStream_Read(lpStream, lpvDest, ulSize, &ulRead);
 550
 551   if (SUCCEEDED(hRet) && ulRead != ulSize)
 552     hRet = E_FAIL;
 553   return hRet;
 554 }
 555
 556 /*************************************************************************
 557  * @       [SHLWAPI.166]
 558  *
 559  * Determine if a stream has 0 length.
 560  *
 561  * PARAMS
 562  *  lpStream [I] IStream object
 563  *
 564  * RETURNS
 565  *  TRUE:  If the stream has 0 length
 566  *  FALSE: Otherwise.
 567  */
 568 BOOL WINAPI SHIsEmptyStream(IStream *lpStream)
 569 {
 570   STATSTG statstg;
 571   BOOL bRet = TRUE;
 572
 573   TRACE("(%p)\n", lpStream);
 574
 575   memset(&statstg, 0, sizeof(statstg));
 576
 577   if(SUCCEEDED(IStream_Stat(lpStream, &statstg, 1)))
 578   {
 579     if(statstg.cbSize.QuadPart)
 580       bRet = FALSE; /* Non-Zero */
 581   }
 582   else
 583   {
 584     DWORD dwDummy;
 585
 586     /* Try to read from the stream */
 587     if(SUCCEEDED(SHIStream_Read(lpStream, &dwDummy, sizeof(dwDummy))))
 588     {
 589       LARGE_INTEGER zero;
 590       zero.QuadPart = 0;
 591
 592       IStream_Seek(lpStream, zero, 0, NULL);
 593       bRet = FALSE; /* Non-Zero */
 594     }
 595   }
 596   return bRet;
 597 }
 598
 599 /*************************************************************************
 600  * @       [SHLWAPI.212]
 601  *
 602  * Call IStream_Write() on a stream.
 603  *
 604  * PARAMS
 605  *  lpStream [I] IStream object
 606  *  lpvSrc   [I] Source for data to write
 607  *  ulSize   [I] Size of data
 608  *
 609  * RETURNS
 610  *  Success: S_OK. ulSize bytes have been written to the stream from lpvSrc.
 611  *  Failure: An HRESULT error code, or E_FAIL if the write succeeded but the
 612  *           number of bytes written does not match.
 613  */
 614 HRESULT WINAPI SHIStream_Write(IStream *lpStream, LPCVOID lpvSrc, ULONG ulSize)
 615 {
 616   ULONG ulWritten;
 617   HRESULT hRet;
 618
 619   TRACE("(%p,%p,%d)\n", lpStream, lpvSrc, ulSize);
 620
 621   hRet = IStream_Write(lpStream, lpvSrc, ulSize, &ulWritten);
 622
 623   if (SUCCEEDED(hRet) && ulWritten != ulSize)
 624     hRet = E_FAIL;
 625
 626   return hRet;
 627 }
 628
 629 /*************************************************************************
 630  * @       [SHLWAPI.213]
 631  *
 632  * Seek to the start of a stream.
 633  *
 634  * PARAMS
 635  *  lpStream [I] IStream object
 636  *
 637  * RETURNS
 638  *  Success: S_OK. The current position within the stream is updated
 639  *  Failure: An HRESULT error code.
 640  */
 641 HRESULT WINAPI IStream_Reset(IStream *lpStream)
 642 {
 643   LARGE_INTEGER zero;
 644   TRACE("(%p)\n", lpStream);
 645   zero.QuadPart = 0;
 646   return IStream_Seek(lpStream, zero, 0, NULL);
 647 }
 648
 649 /*************************************************************************
 650  * @       [SHLWAPI.214]
 651  *
 652  * Get the size of a stream.
 653  *
 654  * PARAMS
 655  *  lpStream [I] IStream object
 656  *  lpulSize [O] Destination for size
 657  *
 658  * RETURNS
 659  *  Success: S_OK. lpulSize contains the size of the stream.
 660  *  Failure: An HRESULT error code.
 661  */
 662 HRESULT WINAPI IStream_Size(IStream *lpStream, ULARGE_INTEGER* lpulSize)
 663 {
 664   STATSTG statstg;
 665   HRESULT hRet;
 666
 667   TRACE("(%p,%p)\n", lpStream, lpulSize);
 668
 669   memset(&statstg, 0, sizeof(statstg));
 670
 671   hRet = IStream_Stat(lpStream, &statstg, 1);
 672
 673   if (SUCCEEDED(hRet) && lpulSize)
 674     *lpulSize = statstg.cbSize;
 675   return hRet;
 676 }