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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 /* Layout of ISHFileStream object */
  39 typedef struct
  40 {
  41   const IStreamVtbl *lpVtbl;
  42   ULONG    ref;
  43   HANDLE   hFile;
  44   DWORD    dwMode;
  45   LPOLESTR lpszPath;
  46   DWORD    type;
  47   DWORD    grfStateBits;
  48 } ISHFileStream;
  49
  50 static HRESULT WINAPI IStream_fnCommit(IStream*,DWORD);
  51
  52
  53 /**************************************************************************
  54 *  IStream_fnQueryInterface
  55 */
  56 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
  57 {
  58   ISHFileStream *This = (ISHFileStream *)iface;
  59
  60   TRACE("(%p,%s,%p)\n", This, debugstr_guid(riid), ppvObj);
  61
  62   *ppvObj = NULL;
  63
  64   if(IsEqualIID(riid, &IID_IUnknown) ||
  65      IsEqualIID(riid, &IID_IStream))
  66   {
  67     *ppvObj = This;
  68
  69     IStream_AddRef((IStream*)*ppvObj);
  70     return S_OK;
  71   }
  72   return E_NOINTERFACE;
  73 }
  74
  75 /**************************************************************************
  76 *  IStream_fnAddRef
  77 */
  78 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
  79 {
  80   ISHFileStream *This = (ISHFileStream *)iface;
  81   ULONG refCount = InterlockedIncrement(&This->ref);
  82
  83   TRACE("(%p)->(ref before=%lu)\n",This, refCount - 1);
  84
  85   return refCount;
  86 }
  87
  88 /**************************************************************************
  89 *  IStream_fnRelease
  90 */
  91 static ULONG WINAPI IStream_fnRelease(IStream *iface)
  92 {
  93   ISHFileStream *This = (ISHFileStream *)iface;
  94   ULONG refCount = InterlockedDecrement(&This->ref);
  95
  96   TRACE("(%p)->(ref before=%lu)\n",This, refCount + 1);
  97
  98   if (!refCount)
  99   {
 100     IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 101     LocalFree((HLOCAL)This->lpszPath);
 102     CloseHandle(This->hFile);
 103     HeapFree(GetProcessHeap(), 0, This);
 104   }
 105
 106   return refCount;
 107 }
 108
 109 /**************************************************************************
 110  * IStream_fnRead
 111  */
 112 static HRESULT WINAPI IStream_fnRead(IStream *iface, void* pv, ULONG cb, ULONG* pcbRead)
 113 {
 114   ISHFileStream *This = (ISHFileStream *)iface;
 115   HRESULT hRet = S_OK;
 116   DWORD dwRead = 0;
 117
 118   TRACE("(%p,%p,0x%08lx,%p)\n", This, pv, cb, pcbRead);
 119
 120   if (!pv)
 121     hRet = STG_E_INVALIDPOINTER;
 122   else if (!ReadFile(This->hFile, pv, cb, &dwRead, NULL))
 123   {
 124     hRet = (HRESULT)GetLastError();
 125     if(hRet > 0)
 126       hRet = HRESULT_FROM_WIN32(hRet);
 127   }
 128   if (pcbRead)
 129     *pcbRead = dwRead;
 130   return hRet;
 131 }
 132
 133 /**************************************************************************
 134  * IStream_fnWrite
 135  */
 136 static HRESULT WINAPI IStream_fnWrite(IStream *iface, const void* pv, ULONG cb, ULONG* pcbWritten)
 137 {
 138   ISHFileStream *This = (ISHFileStream *)iface;
 139   HRESULT hRet = S_OK;
 140   DWORD dwWritten = 0;
 141
 142   TRACE("(%p,%p,0x%08lx,%p)\n", This, pv, cb, pcbWritten);
 143
 144   if (!pv)
 145     hRet = STG_E_INVALIDPOINTER;
 146   else if (!(This->dwMode & STGM_WRITE))
 147     hRet = E_FAIL;
 148   else if (!WriteFile(This->hFile, pv, cb, &dwWritten, NULL))
 149   {
 150     hRet = (HRESULT)GetLastError();
 151     if(hRet > 0)
 152       hRet = HRESULT_FROM_WIN32(hRet);
 153   }
 154   if (pcbWritten)
 155     *pcbWritten = dwWritten;
 156   return hRet;
 157 }
 158
 159 /**************************************************************************
 160  *  IStream_fnSeek
 161  */
 162 static HRESULT WINAPI IStream_fnSeek(IStream *iface, LARGE_INTEGER dlibMove,
 163                                      DWORD dwOrigin, ULARGE_INTEGER* pNewPos)
 164 {
 165   ISHFileStream *This = (ISHFileStream *)iface;
 166   DWORD dwPos;
 167
 168   TRACE("(%p,%ld,%ld,%p)\n", This, dlibMove.u.LowPart, dwOrigin, pNewPos);
 169
 170   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 171   dwPos = SetFilePointer(This->hFile, dlibMove.u.LowPart, NULL, dwOrigin);
 172
 173   if (pNewPos)
 174   {
 175     pNewPos->u.HighPart = 0;
 176     pNewPos->u.LowPart = dwPos;
 177   }
 178   return S_OK;
 179 }
 180
 181 /**************************************************************************
 182  * IStream_fnSetSize
 183  */
 184 static HRESULT WINAPI IStream_fnSetSize(IStream *iface, ULARGE_INTEGER libNewSize)
 185 {
 186   ISHFileStream *This = (ISHFileStream *)iface;
 187
 188   TRACE("(%p,%ld)\n", This, libNewSize.u.LowPart);
 189   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 190   return E_NOTIMPL;
 191 }
 192
 193 /**************************************************************************
 194  * IStream_fnCopyTo
 195  */
 196 static HRESULT WINAPI IStream_fnCopyTo(IStream *iface, IStream* pstm, ULARGE_INTEGER cb,
 197                                        ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
 198 {
 199   ISHFileStream *This = (ISHFileStream *)iface;
 200   char copyBuff[1024];
 201   ULONGLONG ulSize;
 202   HRESULT hRet = S_OK;
 203
 204   TRACE("(%p,%p,%ld,%p,%p)\n", This, pstm, cb.u.LowPart, pcbRead, pcbWritten);
 205
 206   if (pcbRead)
 207     pcbRead->QuadPart = 0;
 208   if (pcbWritten)
 209     pcbWritten->QuadPart = 0;
 210
 211   if (!pstm)
 212     return STG_E_INVALIDPOINTER;
 213
 214   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 215
 216   /* Copy data */
 217   ulSize = cb.QuadPart;
 218   while (ulSize)
 219   {
 220     ULONG ulLeft, ulAmt;
 221
 222     ulLeft = ulSize > sizeof(copyBuff) ? sizeof(copyBuff) : ulSize;
 223
 224     /* Read */
 225     hRet = IStream_fnRead(iface, copyBuff, ulLeft, &ulAmt);
 226     if (pcbRead)
 227       pcbRead->QuadPart += ulAmt;
 228     if (FAILED(hRet) || ulAmt != ulLeft)
 229       break;
 230
 231     /* Write */
 232     hRet = IStream_fnWrite(pstm, copyBuff, ulLeft, &ulAmt);
 233     if (pcbWritten)
 234       pcbWritten->QuadPart += ulAmt;
 235     if (FAILED(hRet) || ulAmt != ulLeft)
 236       break;
 237
 238     ulSize -= ulLeft;
 239   }
 240   return hRet;
 241 }
 242
 243 /**************************************************************************
 244  * IStream_fnCommit
 245  */
 246 static HRESULT WINAPI IStream_fnCommit(IStream *iface, DWORD grfCommitFlags)
 247 {
 248   ISHFileStream *This = (ISHFileStream *)iface;
 249
 250   TRACE("(%p,%ld)\n", This, grfCommitFlags);
 251   /* Currently unbuffered: This function is not needed */
 252   return S_OK;
 253 }
 254
 255 /**************************************************************************
 256  * IStream_fnRevert
 257  */
 258 static HRESULT WINAPI IStream_fnRevert(IStream *iface)
 259 {
 260   ISHFileStream *This = (ISHFileStream *)iface;
 261
 262   TRACE("(%p)\n", This);
 263   return E_NOTIMPL;
 264 }
 265
 266 /**************************************************************************
 267  * IStream_fnLockUnlockRegion
 268  */
 269 static HRESULT WINAPI IStream_fnLockUnlockRegion(IStream *iface, ULARGE_INTEGER libOffset,
 270                                                  ULARGE_INTEGER cb, DWORD dwLockType)
 271 {
 272   ISHFileStream *This = (ISHFileStream *)iface;
 273   TRACE("(%p,%ld,%ld,%ld)\n", This, libOffset.u.LowPart, cb.u.LowPart, dwLockType);
 274   return E_NOTIMPL;
 275 }
 276
 277 /*************************************************************************
 278  * IStream_fnStat
 279  */
 280 static HRESULT WINAPI IStream_fnStat(IStream *iface, STATSTG* lpStat,
 281                                      DWORD grfStatFlag)
 282 {
 283   ISHFileStream *This = (ISHFileStream *)iface;
 284   BY_HANDLE_FILE_INFORMATION fi;
 285   HRESULT hRet = S_OK;
 286
 287   TRACE("(%p,%p,%ld)\n", This, lpStat, grfStatFlag);
 288
 289   if (!grfStatFlag)
 290     hRet = STG_E_INVALIDPOINTER;
 291   else
 292   {
 293     memset(&fi, 0, sizeof(fi));
 294     GetFileInformationByHandle(This->hFile, &fi);
 295
 296     if (grfStatFlag & STATFLAG_NONAME)
 297       lpStat->pwcsName = NULL;
 298     else
 299       lpStat->pwcsName = StrDupW(This->lpszPath);
 300     lpStat->type = This->type;
 301     lpStat->cbSize.u.LowPart = fi.nFileSizeLow;
 302     lpStat->cbSize.u.HighPart = fi.nFileSizeHigh;
 303     lpStat->mtime = fi.ftLastWriteTime;
 304     lpStat->ctime = fi.ftCreationTime;
 305     lpStat->atime = fi.ftLastAccessTime;
 306     lpStat->grfMode = This->dwMode;
 307     lpStat->grfLocksSupported = 0;
 308     memcpy(&lpStat->clsid, &IID_IStream, sizeof(CLSID));
 309     lpStat->grfStateBits = This->grfStateBits;
 310     lpStat->reserved = 0;
 311   }
 312   return hRet;
 313 }
 314
 315 /*************************************************************************
 316  * IStream_fnClone
 317  */
 318 static HRESULT WINAPI IStream_fnClone(IStream *iface, IStream** ppstm)
 319 {
 320   ISHFileStream *This = (ISHFileStream *)iface;
 321
 322   TRACE("(%p)\n",This);
 323   if (ppstm)
 324     *ppstm = NULL;
 325   return E_NOTIMPL;
 326 }
 327
 328 static const IStreamVtbl SHLWAPI_fsVTable =
 329 {
 330   IStream_fnQueryInterface,
 331   IStream_fnAddRef,
 332   IStream_fnRelease,
 333   IStream_fnRead,
 334   IStream_fnWrite,
 335   IStream_fnSeek,
 336   IStream_fnSetSize,
 337   IStream_fnCopyTo,
 338   IStream_fnCommit,
 339   IStream_fnRevert,
 340   IStream_fnLockUnlockRegion,
 341   IStream_fnLockUnlockRegion,
 342   IStream_fnStat,
 343   IStream_fnClone
 344 };
 345
 346 /**************************************************************************
 347  * IStream_Create
 348  *
 349  * Internal helper: Create and initialise a new file stream object.
 350  */
 351 static IStream *IStream_Create(LPCWSTR lpszPath, HANDLE hFile, DWORD dwMode)
 352 {
 353  ISHFileStream* fileStream;
 354
 355  fileStream = HeapAlloc(GetProcessHeap(), 0, sizeof(ISHFileStream));
 356
 357  if (fileStream)
 358  {
 359    fileStream->lpVtbl = &SHLWAPI_fsVTable;
 360    fileStream->ref = 1;
 361    fileStream->hFile = hFile;
 362    fileStream->dwMode = dwMode;
 363    fileStream->lpszPath = StrDupW(lpszPath);
 364    fileStream->type = 0; /* FIXME */
 365    fileStream->grfStateBits = 0; /* FIXME */
 366  }
 367  TRACE ("Returning %p\n", fileStream);
 368  return (IStream *)fileStream;
 369 }
 370
 371 /*************************************************************************
 372  * SHCreateStreamOnFileEx   [SHLWAPI.@]
 373  *
 374  * Create a stream on a file.
 375  *
 376  * PARAMS
 377  *  lpszPath     [I] Path of file to create stream on
 378  *  dwMode       [I] Mode to create stream in
 379  *  dwAttributes [I] Attributes of the file
 380  *  bCreate      [I] Whether to create the file if it doesn't exist
 381  *  lpTemplate   [I] Reserved, must be NULL
 382  *  lppStream    [O] Destination for created stream
 383  *
 384  * RETURNS
 385  * Success: S_OK. lppStream contains the new stream object
 386  * Failure: E_INVALIDARG if any parameter is invalid, or an HRESULT error code
 387  *
 388  * NOTES
 389  *  This function is available in Unicode only.
 390  */
 391 HRESULT WINAPI SHCreateStreamOnFileEx(LPCWSTR lpszPath, DWORD dwMode,
 392                                       DWORD dwAttributes, BOOL bCreate,
 393                                       IStream *lpTemplate, IStream **lppStream)
 394 {
 395   DWORD dwAccess, dwShare, dwCreate;
 396   HANDLE hFile;
 397
 398   TRACE("(%s,%ld,0x%08lX,%d,%p,%p)\n", debugstr_w(lpszPath), dwMode,
 399         dwAttributes, bCreate, lpTemplate, lppStream);
 400
 401   if (!lpszPath || !lppStream || lpTemplate)
 402     return E_INVALIDARG;
 403
 404   *lppStream = NULL;
 405
 406   if (dwMode & ~(STGM_WRITE|STGM_READWRITE|STGM_SHARE_DENY_NONE|STGM_SHARE_DENY_READ|STGM_CREATE))
 407   {
 408     WARN("Invalid mode 0x%08lX\n", dwMode);
 409     return E_INVALIDARG;
 410   }
 411
 412   /* Access */
 413   switch (dwMode & (STGM_WRITE|STGM_READWRITE))
 414   {
 415   case STGM_READWRITE|STGM_WRITE:
 416   case STGM_READWRITE:
 417     dwAccess = GENERIC_READ|GENERIC_WRITE;
 418     break;
 419   case STGM_WRITE:
 420     dwAccess = GENERIC_WRITE;
 421     break;
 422   default:
 423     dwAccess = GENERIC_READ;
 424     break;
 425   }
 426
 427   /* Sharing */
 428   switch (dwMode & STGM_SHARE_DENY_READ)
 429   {
 430   case STGM_SHARE_DENY_READ:
 431     dwShare = FILE_SHARE_WRITE;
 432     break;
 433   case STGM_SHARE_DENY_WRITE:
 434     dwShare = FILE_SHARE_READ;
 435     break;
 436   case STGM_SHARE_EXCLUSIVE:
 437     dwShare = 0;
 438     break;
 439   default:
 440     dwShare = FILE_SHARE_READ|FILE_SHARE_WRITE;
 441   }
 442
 443   /* FIXME: Creation Flags, MSDN is fuzzy on the mapping... */
 444   if (dwMode == STGM_FAILIFTHERE)
 445     dwCreate = bCreate ? CREATE_NEW : OPEN_EXISTING;
 446   else if (dwMode & STGM_CREATE)
 447     dwCreate = CREATE_ALWAYS;
 448   else
 449     dwCreate = OPEN_ALWAYS;
 450
 451   /* Open HANDLE to file */
 452   hFile = CreateFileW(lpszPath, dwAccess, dwShare, NULL, dwCreate,
 453                       dwAttributes, 0);
 454
 455   if(hFile == INVALID_HANDLE_VALUE)
 456   {
 457     HRESULT hRet = (HRESULT)GetLastError();
 458     if(hRet > 0)
 459       hRet = HRESULT_FROM_WIN32(hRet);
 460     return hRet;
 461   }
 462
 463   *lppStream = IStream_Create(lpszPath, hFile, dwMode);
 464
 465   if(!*lppStream)
 466   {
 467     CloseHandle(hFile);
 468     return E_OUTOFMEMORY;
 469   }
 470   return S_OK;
 471 }
 472
 473 /*************************************************************************
 474  * SHCreateStreamOnFileW   [SHLWAPI.@]
 475  *
 476  * See SHCreateStreamOnFileA.
 477  */
 478 HRESULT WINAPI SHCreateStreamOnFileW(LPCWSTR lpszPath, DWORD dwMode,
 479                                    IStream **lppStream)
 480 {
 481   DWORD dwAttr;
 482
 483   TRACE("(%s,%ld,%p)\n", debugstr_w(lpszPath), dwMode, lppStream);
 484
 485   if (!lpszPath || !lppStream)
 486     return E_INVALIDARG;
 487
 488   dwAttr = GetFileAttributesW(lpszPath);
 489   if (dwAttr == INVALID_FILE_ATTRIBUTES)
 490     dwAttr = 0;
 491
 492   return SHCreateStreamOnFileEx(lpszPath, dwMode|STGM_WRITE, dwAttr,
 493                                 TRUE, NULL, lppStream);
 494 }
 495
 496 /*************************************************************************
 497  * SHCreateStreamOnFileA   [SHLWAPI.@]
 498  *
 499  * Create a stream on a file.
 500  *
 501  * PARAMS
 502  *  lpszPath  [I] Path of file to create stream on
 503  *  dwMode    [I] Mode to create stream in
 504  *  lppStream [O] Destination for created IStream object
 505  *
 506  * RETURNS
 507  * Success: S_OK. lppStream contains the new IStream object
 508  * Failure: E_INVALIDARG if any parameter is invalid, or an HRESULT error code
 509  */
 510 HRESULT WINAPI SHCreateStreamOnFileA(LPCSTR lpszPath, DWORD dwMode,
 511                                      IStream **lppStream)
 512 {
 513   WCHAR szPath[MAX_PATH];
 514
 515   TRACE("(%s,%ld,%p)\n", debugstr_a(lpszPath), dwMode, lppStream);
 516
 517   if (!lpszPath)
 518     return E_INVALIDARG;
 519   MultiByteToWideChar(0, 0, lpszPath, -1, szPath, MAX_PATH);
 520   return SHCreateStreamOnFileW(szPath, dwMode, lppStream);
 521 }
 522
 523 /*************************************************************************
 524  * @       [SHLWAPI.184]
 525  *
 526  * Call IStream_Read() on a stream.
 527  *
 528  * PARAMS
 529  *  lpStream [I] IStream object
 530  *  lpvDest  [O] Destination for data read
 531  *  ulSize   [I] Size of data to read
 532  *
 533  * RETURNS
 534  *  Success: S_OK. ulSize bytes have been read from the stream into lpvDest.
 535  *  Failure: An HRESULT error code, or E_FAIL if the read succeeded but the
 536  *           number of bytes read does not match.
 537  */
 538 HRESULT WINAPI SHLWAPI_184(IStream *lpStream, LPVOID lpvDest, ULONG ulSize)
 539 {
 540   ULONG ulRead;
 541   HRESULT hRet;
 542
 543   TRACE("(%p,%p,%ld)\n", lpStream, lpvDest, ulSize);
 544
 545   hRet = IStream_Read(lpStream, lpvDest, ulSize, &ulRead);
 546
 547   if (SUCCEEDED(hRet) && ulRead != ulSize)
 548     hRet = E_FAIL;
 549   return hRet;
 550 }
 551
 552 /*************************************************************************
 553  * @       [SHLWAPI.166]
 554  *
 555  * Determine if a stream has 0 length.
 556  *
 557  * PARAMS
 558  *  lpStream [I] IStream object
 559  *
 560  * RETURNS
 561  *  TRUE:  If the stream has 0 length
 562  *  FALSE: Otherwise.
 563  */
 564 BOOL WINAPI SHIsEmptyStream(IStream *lpStream)
 565 {
 566   STATSTG statstg;
 567   BOOL bRet = TRUE;
 568
 569   TRACE("(%p)\n", lpStream);
 570
 571   memset(&statstg, 0, sizeof(statstg));
 572
 573   if(SUCCEEDED(IStream_Stat(lpStream, &statstg, 1)))
 574   {
 575     if(statstg.cbSize.QuadPart)
 576       bRet = FALSE; /* Non-Zero */
 577   }
 578   else
 579   {
 580     DWORD dwDummy;
 581
 582     /* Try to read from the stream */
 583     if(SUCCEEDED(SHLWAPI_184(lpStream, &dwDummy, sizeof(dwDummy))))
 584     {
 585       LARGE_INTEGER zero;
 586       zero.QuadPart = 0;
 587
 588       IStream_Seek(lpStream, zero, 0, NULL);
 589       bRet = FALSE; /* Non-Zero */
 590     }
 591   }
 592   return bRet;
 593 }
 594
 595 /*************************************************************************
 596  * @       [SHLWAPI.212]
 597  *
 598  * Call IStream_Write() on a stream.
 599  *
 600  * PARAMS
 601  *  lpStream [I] IStream object
 602  *  lpvSrc   [I] Source for data to write
 603  *  ulSize   [I] Size of data
 604  *
 605  * RETURNS
 606  *  Success: S_OK. ulSize bytes have been written to the stream from lpvSrc.
 607  *  Failure: An HRESULT error code, or E_FAIL if the write succeeded but the
 608  *           number of bytes written does not match.
 609  */
 610 HRESULT WINAPI SHLWAPI_212(IStream *lpStream, LPCVOID lpvSrc, ULONG ulSize)
 611 {
 612   ULONG ulWritten;
 613   HRESULT hRet;
 614
 615   TRACE("(%p,%p,%ld)\n", lpStream, lpvSrc, ulSize);
 616
 617   hRet = IStream_Write(lpStream, lpvSrc, ulSize, &ulWritten);
 618
 619   if (SUCCEEDED(hRet) && ulWritten != ulSize)
 620     hRet = E_FAIL;
 621
 622   return hRet;
 623 }
 624
 625 /*************************************************************************
 626  * @       [SHLWAPI.213]
 627  *
 628  * Seek to the start of a stream.
 629  *
 630  * PARAMS
 631  *  lpStream [I] IStream object
 632  *
 633  * RETURNS
 634  *  Success: S_OK. The current position within the stream is updated
 635  *  Failure: An HRESULT error code.
 636  */
 637 HRESULT WINAPI IStream_Reset(IStream *lpStream)
 638 {
 639   LARGE_INTEGER zero;
 640   TRACE("(%p)\n", lpStream);
 641   zero.QuadPart = 0;
 642   return IStream_Seek(lpStream, zero, 0, NULL);
 643 }
 644
 645 /*************************************************************************
 646  * @       [SHLWAPI.214]
 647  *
 648  * Get the size of a stream.
 649  *
 650  * PARAMS
 651  *  lpStream [I] IStream object
 652  *  lpulSize [O] Destination for size
 653  *
 654  * RETURNS
 655  *  Success: S_OK. lpulSize contains the size of the stream.
 656  *  Failure: An HRESULT error code.
 657  */
 658 HRESULT WINAPI IStream_Size(IStream *lpStream, ULARGE_INTEGER* lpulSize)
 659 {
 660   STATSTG statstg;
 661   HRESULT hRet;
 662
 663   TRACE("(%p,%p)\n", lpStream, lpulSize);
 664
 665   memset(&statstg, 0, sizeof(statstg));
 666
 667   hRet = IStream_Stat(lpStream, &statstg, 1);
 668
 669   if (SUCCEEDED(hRet) && lpulSize)
 670     *lpulSize = statstg.cbSize;
 671   return hRet;
 672 }