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 NONAMELESSUNION
  24 #define NONAMELESSSTRUCT
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "winerror.h"
  28 #include "winnls.h"
  29 #define NO_SHLWAPI_REG
  30 #define NO_SHLWAPI_PATH
  31 #include "shlwapi.h"
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  35
  36 /* Layout of ISHFileStream object */
  37 typedef struct
  38 {
  39   IStreamVtbl *lpVtbl;
  40   ULONG    ref;
  41   HANDLE   hFile;
  42   DWORD    dwMode;
  43   LPOLESTR lpszPath;
  44   DWORD    type;
  45   DWORD    grfStateBits;
  46 } ISHFileStream;
  47
  48 static HRESULT WINAPI IStream_fnCommit(IStream*,DWORD);
  49
  50
  51 /**************************************************************************
  52 *  IStream_fnQueryInterface
  53 */
  54 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
  55 {
  56   ISHFileStream *This = (ISHFileStream *)iface;
  57
  58   TRACE("(%p,%s,%p)\n", This, debugstr_guid(riid), ppvObj);
  59
  60   *ppvObj = NULL;
  61
  62   if(IsEqualIID(riid, &IID_IUnknown) ||
  63      IsEqualIID(riid, &IID_IStream))
  64   {
  65     *ppvObj = This;
  66
  67     IStream_AddRef((IStream*)*ppvObj);
  68     return S_OK;
  69   }
  70   return E_NOINTERFACE;
  71 }
  72
  73 /**************************************************************************
  74 *  IStream_fnAddRef
  75 */
  76 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
  77 {
  78   ISHFileStream *This = (ISHFileStream *)iface;
  79
  80   TRACE("(%p)\n", This);
  81   return InterlockedIncrement(&This->ref);
  82 }
  83
  84 /**************************************************************************
  85 *  IStream_fnRelease
  86 */
  87 static ULONG WINAPI IStream_fnRelease(IStream *iface)
  88 {
  89   ISHFileStream *This = (ISHFileStream *)iface;
  90   ULONG ulRet;
  91
  92   TRACE("(%p)\n", This);
  93
  94   if (!(ulRet = InterlockedDecrement(&This->ref)))
  95   {
  96     IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
  97     LocalFree((HLOCAL)This->lpszPath);
  98     CloseHandle(This->hFile);
  99     HeapFree(GetProcessHeap(), 0, This);
 100   }
 101   return ulRet;
 102 }
 103
 104 /**************************************************************************
 105  * IStream_fnRead
 106  */
 107 static HRESULT WINAPI IStream_fnRead(IStream *iface, void* pv, ULONG cb, ULONG* pcbRead)
 108 {
 109   ISHFileStream *This = (ISHFileStream *)iface;
 110   HRESULT hRet = S_OK;
 111   DWORD dwRead = 0;
 112
 113   TRACE("(%p,%p,0x%08lx,%p)\n", This, pv, cb, pcbRead);
 114
 115   if (!pv)
 116     hRet = STG_E_INVALIDPOINTER;
 117   else if (!ReadFile(This->hFile, pv, cb, &dwRead, NULL))
 118   {
 119     hRet = (HRESULT)GetLastError();
 120     if(hRet > 0)
 121       hRet = HRESULT_FROM_WIN32(hRet);
 122   }
 123   if (pcbRead)
 124     *pcbRead = dwRead;
 125   return hRet;
 126 }
 127
 128 /**************************************************************************
 129  * IStream_fnWrite
 130  */
 131 static HRESULT WINAPI IStream_fnWrite(IStream *iface, const void* pv, ULONG cb, ULONG* pcbWritten)
 132 {
 133   ISHFileStream *This = (ISHFileStream *)iface;
 134   HRESULT hRet = S_OK;
 135   DWORD dwWritten = 0;
 136
 137   TRACE("(%p,%p,0x%08lx,%p)\n", This, pv, cb, pcbWritten);
 138
 139   if (!pv)
 140     hRet = STG_E_INVALIDPOINTER;
 141   else if (!(This->dwMode & STGM_WRITE))
 142     hRet = E_FAIL;
 143   else if (!WriteFile(This->hFile, pv, cb, &dwWritten, NULL))
 144   {
 145     hRet = (HRESULT)GetLastError();
 146     if(hRet > 0)
 147       hRet = HRESULT_FROM_WIN32(hRet);
 148   }
 149   if (pcbWritten)
 150     *pcbWritten = dwWritten;
 151   return hRet;
 152 }
 153
 154 /**************************************************************************
 155  *  IStream_fnSeek
 156  */
 157 static HRESULT WINAPI IStream_fnSeek(IStream *iface, LARGE_INTEGER dlibMove,
 158                                      DWORD dwOrigin, ULARGE_INTEGER* pNewPos)
 159 {
 160   ISHFileStream *This = (ISHFileStream *)iface;
 161   DWORD dwPos;
 162
 163   TRACE("(%p,%ld,%ld,%p)\n", This, dlibMove.u.LowPart, dwOrigin, pNewPos);
 164
 165   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 166   dwPos = SetFilePointer(This->hFile, dlibMove.u.LowPart, NULL, dwOrigin);
 167
 168   if (pNewPos)
 169   {
 170     pNewPos->u.HighPart = 0;
 171     pNewPos->u.LowPart = dwPos;
 172   }
 173   return S_OK;
 174 }
 175
 176 /**************************************************************************
 177  * IStream_fnSetSize
 178  */
 179 static HRESULT WINAPI IStream_fnSetSize(IStream *iface, ULARGE_INTEGER libNewSize)
 180 {
 181   ISHFileStream *This = (ISHFileStream *)iface;
 182
 183   TRACE("(%p,%ld)\n", This, libNewSize.u.LowPart);
 184   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 185   return E_NOTIMPL;
 186 }
 187
 188 /**************************************************************************
 189  * IStream_fnCopyTo
 190  */
 191 static HRESULT WINAPI IStream_fnCopyTo(IStream *iface, IStream* pstm, ULARGE_INTEGER cb,
 192                                        ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
 193 {
 194   ISHFileStream *This = (ISHFileStream *)iface;
 195   char copyBuff[1024];
 196   ULONGLONG ulSize;
 197   HRESULT hRet = S_OK;
 198
 199   TRACE("(%p,%p,%ld,%p,%p)\n", This, pstm, cb.u.LowPart, pcbRead, pcbWritten);
 200
 201   if (pcbRead)
 202     pcbRead->QuadPart = 0;
 203   if (pcbWritten)
 204     pcbWritten->QuadPart = 0;
 205
 206   if (!pstm)
 207     return STG_E_INVALIDPOINTER;
 208
 209   IStream_fnCommit(iface, 0); /* If ever buffered, this will be needed */
 210
 211   /* Copy data */
 212   ulSize = cb.QuadPart;
 213   while (ulSize)
 214   {
 215     ULONG ulLeft, ulAmt;
 216
 217     ulLeft = ulSize > sizeof(copyBuff) ? sizeof(copyBuff) : ulSize;
 218
 219     /* Read */
 220     hRet = IStream_fnRead(iface, copyBuff, ulLeft, &ulAmt);
 221     if (pcbRead)
 222       pcbRead->QuadPart += ulAmt;
 223     if (FAILED(hRet) || ulAmt != ulLeft)
 224       break;
 225
 226     /* Write */
 227     hRet = IStream_fnWrite(pstm, copyBuff, ulLeft, &ulAmt);
 228     if (pcbWritten)
 229       pcbWritten->QuadPart += ulAmt;
 230     if (FAILED(hRet) || ulAmt != ulLeft)
 231       break;
 232
 233     ulSize -= ulLeft;
 234   }
 235   return hRet;
 236 }
 237
 238 /**************************************************************************
 239  * IStream_fnCommit
 240  */
 241 static HRESULT WINAPI IStream_fnCommit(IStream *iface, DWORD grfCommitFlags)
 242 {
 243   ISHFileStream *This = (ISHFileStream *)iface;
 244
 245   TRACE("(%p,%ld)\n", This, grfCommitFlags);
 246   /* Currently unbuffered: This function is not needed */
 247   return S_OK;
 248 }
 249
 250 /**************************************************************************
 251  * IStream_fnRevert
 252  */
 253 static HRESULT WINAPI IStream_fnRevert(IStream *iface)
 254 {
 255   ISHFileStream *This = (ISHFileStream *)iface;
 256
 257   TRACE("(%p)\n", This);
 258   return E_NOTIMPL;
 259 }
 260
 261 /**************************************************************************
 262  * IStream_fnLockUnlockRegion
 263  */
 264 static HRESULT WINAPI IStream_fnLockUnlockRegion(IStream *iface, ULARGE_INTEGER libOffset,
 265                                                  ULARGE_INTEGER cb, DWORD dwLockType)
 266 {
 267   ISHFileStream *This = (ISHFileStream *)iface;
 268   TRACE("(%p,%ld,%ld,%ld)\n", This, libOffset.u.LowPart, cb.u.LowPart, dwLockType);
 269   return E_NOTIMPL;
 270 }
 271
 272 /*************************************************************************
 273  * IStream_fnStat
 274  */
 275 static HRESULT WINAPI IStream_fnStat(IStream *iface, STATSTG* lpStat,
 276                                      DWORD grfStatFlag)
 277 {
 278   ISHFileStream *This = (ISHFileStream *)iface;
 279   BY_HANDLE_FILE_INFORMATION fi;
 280   HRESULT hRet = S_OK;
 281
 282   TRACE("(%p,%p,%ld)\n", This, lpStat, grfStatFlag);
 283
 284   if (!grfStatFlag)
 285     hRet = STG_E_INVALIDPOINTER;
 286   else
 287   {
 288     memset(&fi, 0, sizeof(fi));
 289     GetFileInformationByHandle(This->hFile, &fi);
 290
 291     if (grfStatFlag & STATFLAG_NONAME)
 292       lpStat->pwcsName = NULL;
 293     else
 294       lpStat->pwcsName = StrDupW(This->lpszPath);
 295     lpStat->type = This->type;
 296     lpStat->cbSize.u.LowPart = fi.nFileSizeLow;
 297     lpStat->cbSize.u.HighPart = fi.nFileSizeHigh;
 298     lpStat->mtime = fi.ftLastWriteTime;
 299     lpStat->ctime = fi.ftCreationTime;
 300     lpStat->atime = fi.ftLastAccessTime;
 301     lpStat->grfMode = This->dwMode;
 302     lpStat->grfLocksSupported = 0;
 303     memcpy(&lpStat->clsid, &IID_IStream, sizeof(CLSID));
 304     lpStat->grfStateBits = This->grfStateBits;
 305     lpStat->reserved = 0;
 306   }
 307   return hRet;
 308 }
 309
 310 /*************************************************************************
 311  * IStream_fnClone
 312  */
 313 static HRESULT WINAPI IStream_fnClone(IStream *iface, IStream** ppstm)
 314 {
 315   ISHFileStream *This = (ISHFileStream *)iface;
 316
 317   TRACE("(%p)\n",This);
 318   if (ppstm)
 319     *ppstm = NULL;
 320   return E_NOTIMPL;
 321 }
 322
 323 static struct IStreamVtbl SHLWAPI_fsVTable =
 324 {
 325   IStream_fnQueryInterface,
 326   IStream_fnAddRef,
 327   IStream_fnRelease,
 328   IStream_fnRead,
 329   IStream_fnWrite,
 330   IStream_fnSeek,
 331   IStream_fnSetSize,
 332   IStream_fnCopyTo,
 333   IStream_fnCommit,
 334   IStream_fnRevert,
 335   IStream_fnLockUnlockRegion,
 336   IStream_fnLockUnlockRegion,
 337   IStream_fnStat,
 338   IStream_fnClone
 339 };
 340
 341 /**************************************************************************
 342  * IStream_Create
 343  *
 344  * Internal helper: Create and initialise a new file stream object.
 345  */
 346 static IStream *IStream_Create(LPCWSTR lpszPath, HANDLE hFile, DWORD dwMode)
 347 {
 348  ISHFileStream* fileStream;
 349
 350  fileStream = (ISHFileStream*)HeapAlloc(GetProcessHeap(), 0, sizeof(ISHFileStream));
 351
 352  if (fileStream)
 353  {
 354    fileStream->lpVtbl = &SHLWAPI_fsVTable;
 355    fileStream->ref = 1;
 356    fileStream->hFile = hFile;
 357    fileStream->dwMode = dwMode;
 358    fileStream->lpszPath = StrDupW(lpszPath);
 359    fileStream->type = 0; /* FIXME */
 360    fileStream->grfStateBits = 0; /* FIXME */
 361  }
 362  TRACE ("Returning %p\n", fileStream);
 363  return (IStream *)fileStream;
 364 }
 365
 366 /*************************************************************************
 367  * SHCreateStreamOnFileEx   [SHLWAPI.@]
 368  *
 369  * Create a stream on a file.
 370  *
 371  * PARAMS
 372  *  lpszPath     [I] Path of file to create stream on
 373  *  dwMode       [I] Mode to create stream in
 374  *  dwAttributes [I] Attributes of the file
 375  *  bCreate      [I] Whether to create the file if it doesn't exist
 376  *  lpTemplate   [I] Reserved, must be NULL
 377  *  lppStream    [O] Destination for created stream
 378  *
 379  * RETURNS
 380  * Success: S_OK. lppStream contains the new stream object
 381  * Failure: E_INVALIDARG if any parameter is invalid, or an HRESULT error code
 382  *
 383  * NOTES
 384  *  This function is available in Unicode only.
 385  */
 386 HRESULT WINAPI SHCreateStreamOnFileEx(LPCWSTR lpszPath, DWORD dwMode,
 387                                       DWORD dwAttributes, BOOL bCreate,
 388                                       IStream *lpTemplate, IStream **lppStream)
 389 {
 390   DWORD dwAccess, dwShare, dwCreate;
 391   HANDLE hFile;
 392
 393   TRACE("(%s,%ld,0x%08lX,%d,%p,%p)\n", debugstr_w(lpszPath), dwMode,
 394         dwAttributes, bCreate, lpTemplate, lppStream);
 395
 396   if (!lpszPath || !lppStream || lpTemplate)
 397     return E_INVALIDARG;
 398
 399   *lppStream = NULL;
 400
 401   if (dwMode & ~(STGM_WRITE|STGM_READWRITE|STGM_SHARE_DENY_NONE|STGM_SHARE_DENY_READ|STGM_CREATE))
 402   {
 403     WARN("Invalid mode 0x%08lX\n", dwMode);
 404     return E_INVALIDARG;
 405   }
 406
 407   /* Access */
 408   switch (dwMode & (STGM_WRITE|STGM_READWRITE))
 409   {
 410   case STGM_READWRITE|STGM_WRITE:
 411   case STGM_READWRITE:
 412     dwAccess = GENERIC_READ|GENERIC_WRITE;
 413     break;
 414   case STGM_WRITE:
 415     dwAccess = GENERIC_WRITE;
 416     break;
 417   default:
 418     dwAccess = GENERIC_READ;
 419     break;
 420   }
 421
 422   /* Sharing */
 423   switch (dwMode & STGM_SHARE_DENY_READ)
 424   {
 425   case STGM_SHARE_DENY_READ:
 426     dwShare = FILE_SHARE_WRITE;
 427     break;
 428   case STGM_SHARE_DENY_WRITE:
 429     dwShare = FILE_SHARE_READ;
 430     break;
 431   case STGM_SHARE_EXCLUSIVE:
 432     dwShare = 0;
 433     break;
 434   default:
 435     dwShare = FILE_SHARE_READ|FILE_SHARE_WRITE;
 436   }
 437
 438   /* FIXME: Creation Flags, MSDN is fuzzy on the mapping... */
 439   if (dwMode == STGM_FAILIFTHERE)
 440     dwCreate = bCreate ? CREATE_NEW : OPEN_EXISTING;
 441   else if (dwMode & STGM_CREATE)
 442     dwCreate = CREATE_ALWAYS;
 443   else
 444     dwCreate = OPEN_ALWAYS;
 445
 446   /* Open HANDLE to file */
 447   hFile = CreateFileW(lpszPath, dwAccess, dwShare, NULL, dwCreate,
 448                       dwAttributes, 0);
 449
 450   if(hFile == INVALID_HANDLE_VALUE)
 451   {
 452     HRESULT hRet = (HRESULT)GetLastError();
 453     if(hRet > 0)
 454       hRet = HRESULT_FROM_WIN32(hRet);
 455     return hRet;
 456   }
 457
 458   *lppStream = IStream_Create(lpszPath, hFile, dwMode);
 459
 460   if(!*lppStream)
 461   {
 462     CloseHandle(hFile);
 463     return E_OUTOFMEMORY;
 464   }
 465   return S_OK;
 466 }
 467
 468 /*************************************************************************
 469  * SHCreateStreamOnFileW   [SHLWAPI.@]
 470  *
 471  * See SHCreateStreamOnFileA.
 472  */
 473 HRESULT WINAPI SHCreateStreamOnFileW(LPCWSTR lpszPath, DWORD dwMode,
 474                                    IStream **lppStream)
 475 {
 476   DWORD dwAttr;
 477
 478   TRACE("(%s,%ld,%p)\n", debugstr_w(lpszPath), dwMode, lppStream);
 479
 480   if (!lpszPath || !lppStream)
 481     return E_INVALIDARG;
 482
 483   dwAttr = GetFileAttributesW(lpszPath);
 484   if (dwAttr == INVALID_FILE_ATTRIBUTES)
 485     dwAttr = 0;
 486
 487   return SHCreateStreamOnFileEx(lpszPath, dwMode|STGM_WRITE, dwAttr,
 488                                 TRUE, NULL, lppStream);
 489 }
 490
 491 /*************************************************************************
 492  * SHCreateStreamOnFileA   [SHLWAPI.@]
 493  *
 494  * Create a stream on a file.
 495  *
 496  * PARAMS
 497  *  lpszPath  [I] Path of file to create stream on
 498  *  dwMode    [I] Mode to create stream in
 499  *  lppStream [O] Destination for created IStream object
 500  *
 501  * RETURNS
 502  * Success: S_OK. lppStream contains the new IStream object
 503  * Failure: E_INVALIDARG if any parameter is invalid, or an HRESULT error code
 504  */
 505 HRESULT WINAPI SHCreateStreamOnFileA(LPCSTR lpszPath, DWORD dwMode,
 506                                      IStream **lppStream)
 507 {
 508   WCHAR szPath[MAX_PATH];
 509
 510   TRACE("(%s,%ld,%p)\n", debugstr_a(lpszPath), dwMode, lppStream);
 511
 512   if (!lpszPath)
 513     return E_INVALIDARG;
 514   MultiByteToWideChar(0, 0, lpszPath, -1, szPath, MAX_PATH);
 515   return SHCreateStreamOnFileW(szPath, dwMode, lppStream);
 516 }
 517
 518 /*************************************************************************
 519  * @       [SHLWAPI.184]
 520  *
 521  * Call IStream_Read() on a stream.
 522  *
 523  * PARAMS
 524  *  lpStream [I] IStream object
 525  *  lpvDest  [O] Destination for data read
 526  *  ulSize   [I] Size of data to read
 527  *
 528  * RETURNS
 529  *  Success: S_OK. ulSize bytes have been read from the stream into lpvDest.
 530  *  Failure: An HRESULT error code, or E_FAIL if the read succeeded but the
 531  *           number of bytes read does not match.
 532  */
 533 HRESULT WINAPI SHLWAPI_184(IStream *lpStream, LPVOID lpvDest, ULONG ulSize)
 534 {
 535   ULONG ulRead;
 536   HRESULT hRet;
 537
 538   TRACE("(%p,%p,%ld)\n", lpStream, lpvDest, ulSize);
 539
 540   hRet = IStream_Read(lpStream, lpvDest, ulSize, &ulRead);
 541
 542   if (SUCCEEDED(hRet) && ulRead != ulSize)
 543     hRet = E_FAIL;
 544   return hRet;
 545 }
 546
 547 /*************************************************************************
 548  * @       [SHLWAPI.166]
 549  *
 550  * Determine if a stream has 0 length.
 551  *
 552  * PARAMS
 553  *  lpStream [I] IStream object
 554  *
 555  * RETURNS
 556  *  TRUE:  If the stream has 0 length
 557  *  FALSE: Otherwise.
 558  */
 559 BOOL WINAPI SHIsEmptyStream(IStream *lpStream)
 560 {
 561   STATSTG statstg;
 562   BOOL bRet = TRUE;
 563
 564   TRACE("(%p)\n", lpStream);
 565
 566   memset(&statstg, 0, sizeof(statstg));
 567
 568   if(SUCCEEDED(IStream_Stat(lpStream, &statstg, 1)))
 569   {
 570     if(statstg.cbSize.QuadPart)
 571       bRet = FALSE; /* Non-Zero */
 572   }
 573   else
 574   {
 575     DWORD dwDummy;
 576
 577     /* Try to read from the stream */
 578     if(SUCCEEDED(SHLWAPI_184(lpStream, &dwDummy, sizeof(dwDummy))))
 579     {
 580       LARGE_INTEGER zero;
 581       zero.QuadPart = 0;
 582
 583       IStream_Seek(lpStream, zero, 0, NULL);
 584       bRet = FALSE; /* Non-Zero */
 585     }
 586   }
 587   return bRet;
 588 }
 589
 590 /*************************************************************************
 591  * @       [SHLWAPI.212]
 592  *
 593  * Call IStream_Write() on a stream.
 594  *
 595  * PARAMS
 596  *  lpStream [I] IStream object
 597  *  lpvSrc   [I] Source for data to write
 598  *  ulSize   [I] Size of data
 599  *
 600  * RETURNS
 601  *  Success: S_OK. ulSize bytes have been written to the stream from lpvSrc.
 602  *  Failure: An HRESULT error code, or E_FAIL if the write succeeded but the
 603  *           number of bytes written does not match.
 604  */
 605 HRESULT WINAPI SHLWAPI_212(IStream *lpStream, LPCVOID lpvSrc, ULONG ulSize)
 606 {
 607   ULONG ulWritten;
 608   HRESULT hRet;
 609
 610   TRACE("(%p,%p,%ld)\n", lpStream, lpvSrc, ulSize);
 611
 612   hRet = IStream_Write(lpStream, lpvSrc, ulSize, &ulWritten);
 613
 614   if (SUCCEEDED(hRet) && ulWritten != ulSize)
 615     hRet = E_FAIL;
 616
 617   return hRet;
 618 }
 619
 620 /*************************************************************************
 621  * @       [SHLWAPI.213]
 622  *
 623  * Seek to the start of a stream.
 624  *
 625  * PARAMS
 626  *  lpStream [I] IStream object
 627  *
 628  * RETURNS
 629  *  Success: S_OK. The current position within the stream is updated
 630  *  Failure: An HRESULT error code.
 631  */
 632 HRESULT WINAPI IStream_Reset(IStream *lpStream)
 633 {
 634   LARGE_INTEGER zero;
 635   TRACE("(%p)\n", lpStream);
 636   zero.QuadPart = 0;
 637   return IStream_Seek(lpStream, zero, 0, NULL);
 638 }
 639
 640 /*************************************************************************
 641  * @       [SHLWAPI.214]
 642  *
 643  * Get the size of a stream.
 644  *
 645  * PARAMS
 646  *  lpStream [I] IStream object
 647  *  lpulSize [O] Destination for size
 648  *
 649  * RETURNS
 650  *  Success: S_OK. lpulSize contains the size of the stream.
 651  *  Failure: An HRESULT error code.
 652  */
 653 HRESULT WINAPI IStream_Size(IStream *lpStream, ULARGE_INTEGER* lpulSize)
 654 {
 655   STATSTG statstg;
 656   HRESULT hRet;
 657
 658   TRACE("(%p,%p)\n", lpStream, lpulSize);
 659
 660   memset(&statstg, 0, sizeof(statstg));
 661
 662   hRet = IStream_Stat(lpStream, &statstg, 1);
 663
 664   if (SUCCEEDED(hRet) && lpulSize)
 665     *lpulSize = statstg.cbSize;
 666   return hRet;
 667 }