source: trunk/src/ole32/hglobalstream.c@ 10579

Last change on this file since 10579 was 9400, checked in by sandervl, 23 years ago

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File size: 20.3 KB
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1/*
2 * HGLOBAL Stream implementation
3 *
4 * This file contains the implementation of the stream interface
5 * for streams contained supported by an HGLOBAL pointer.
6 *
7 * Copyright 1999 Francis Beaudet
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include "config.h"
25
26#include <assert.h>
27#include <stdlib.h>
28#include <stdio.h>
29#include <string.h>
30
31#include "windef.h"
32#include "objbase.h"
33#include "ole2.h"
34#include "winbase.h"
35#include "winerror.h"
36#include "winternl.h"
37
38#include "wine/debug.h"
39
40WINE_DEFAULT_DEBUG_CHANNEL(storage);
41
42/****************************************************************************
43 * HGLOBALStreamImpl definition.
44 *
45 * This class imlements the IStream inteface and represents a stream
46 * supported by an HGLOBAL pointer.
47 */
48struct HGLOBALStreamImpl
49{
50 ICOM_VFIELD(IStream); /* Needs to be the first item in the stuct
51 * since we want to cast this in a IStream pointer */
52
53 /*
54 * Reference count
55 */
56 ULONG ref;
57
58 /*
59 * Support for the stream
60 */
61 HGLOBAL supportHandle;
62
63 /*
64 * This flag is TRUE if the HGLOBAL is destroyed when the stream
65 * is finally released.
66 */
67 BOOL deleteOnRelease;
68
69 /*
70 * Helper variable that contains the size of the stream
71 */
72 ULARGE_INTEGER streamSize;
73
74 /*
75 * This is the current position of the cursor in the stream
76 */
77 ULARGE_INTEGER currentPosition;
78};
79
80typedef struct HGLOBALStreamImpl HGLOBALStreamImpl;
81
82/*
83 * Method definition for the StgStreamImpl class.
84 */
85HGLOBALStreamImpl* HGLOBALStreamImpl_Construct(
86 HGLOBAL hGlobal,
87 BOOL fDeleteOnRelease);
88
89void HGLOBALStreamImpl_Destroy(
90 HGLOBALStreamImpl* This);
91
92void HGLOBALStreamImpl_OpenBlockChain(
93 HGLOBALStreamImpl* This);
94
95HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
96 IStream* iface,
97 REFIID riid, /* [in] */
98 void** ppvObject); /* [iid_is][out] */
99
100ULONG WINAPI HGLOBALStreamImpl_AddRef(
101 IStream* iface);
102
103ULONG WINAPI HGLOBALStreamImpl_Release(
104 IStream* iface);
105
106HRESULT WINAPI HGLOBALStreamImpl_Read(
107 IStream* iface,
108 void* pv, /* [length_is][size_is][out] */
109 ULONG cb, /* [in] */
110 ULONG* pcbRead); /* [out] */
111
112HRESULT WINAPI HGLOBALStreamImpl_Write(
113 IStream* iface,
114 const void* pv, /* [size_is][in] */
115 ULONG cb, /* [in] */
116 ULONG* pcbWritten); /* [out] */
117
118HRESULT WINAPI HGLOBALStreamImpl_Seek(
119 IStream* iface,
120 LARGE_INTEGER dlibMove, /* [in] */
121 DWORD dwOrigin, /* [in] */
122 ULARGE_INTEGER* plibNewPosition); /* [out] */
123
124HRESULT WINAPI HGLOBALStreamImpl_SetSize(
125 IStream* iface,
126 ULARGE_INTEGER libNewSize); /* [in] */
127
128HRESULT WINAPI HGLOBALStreamImpl_CopyTo(
129 IStream* iface,
130 IStream* pstm, /* [unique][in] */
131 ULARGE_INTEGER cb, /* [in] */
132 ULARGE_INTEGER* pcbRead, /* [out] */
133 ULARGE_INTEGER* pcbWritten); /* [out] */
134
135HRESULT WINAPI HGLOBALStreamImpl_Commit(
136 IStream* iface,
137 DWORD grfCommitFlags); /* [in] */
138
139HRESULT WINAPI HGLOBALStreamImpl_Revert(
140 IStream* iface);
141
142HRESULT WINAPI HGLOBALStreamImpl_LockRegion(
143 IStream* iface,
144 ULARGE_INTEGER libOffset, /* [in] */
145 ULARGE_INTEGER cb, /* [in] */
146 DWORD dwLockType); /* [in] */
147
148HRESULT WINAPI HGLOBALStreamImpl_UnlockRegion(
149 IStream* iface,
150 ULARGE_INTEGER libOffset, /* [in] */
151 ULARGE_INTEGER cb, /* [in] */
152 DWORD dwLockType); /* [in] */
153
154HRESULT WINAPI HGLOBALStreamImpl_Stat(
155 IStream* iface,
156 STATSTG* pstatstg, /* [out] */
157 DWORD grfStatFlag); /* [in] */
158
159HRESULT WINAPI HGLOBALStreamImpl_Clone(
160 IStream* iface,
161 IStream** ppstm); /* [out] */
162
163
164/*
165 * Virtual function table for the HGLOBALStreamImpl class.
166 */
167static ICOM_VTABLE(IStream) HGLOBALStreamImpl_Vtbl =
168{
169 ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
170 HGLOBALStreamImpl_QueryInterface,
171 HGLOBALStreamImpl_AddRef,
172 HGLOBALStreamImpl_Release,
173 HGLOBALStreamImpl_Read,
174 HGLOBALStreamImpl_Write,
175 HGLOBALStreamImpl_Seek,
176 HGLOBALStreamImpl_SetSize,
177 HGLOBALStreamImpl_CopyTo,
178 HGLOBALStreamImpl_Commit,
179 HGLOBALStreamImpl_Revert,
180 HGLOBALStreamImpl_LockRegion,
181 HGLOBALStreamImpl_UnlockRegion,
182 HGLOBALStreamImpl_Stat,
183 HGLOBALStreamImpl_Clone
184};
185
186/***********************************************************************
187 * CreateStreamOnHGlobal [OLE32.61]
188 */
189HRESULT WINAPI CreateStreamOnHGlobal(
190 HGLOBAL hGlobal,
191 BOOL fDeleteOnRelease,
192 LPSTREAM* ppstm)
193{
194 HGLOBALStreamImpl* newStream;
195
196 newStream = HGLOBALStreamImpl_Construct(hGlobal,
197 fDeleteOnRelease);
198
199 if (newStream!=NULL)
200 {
201 return IUnknown_QueryInterface((IUnknown*)newStream,
202 &IID_IStream,
203 (void**)ppstm);
204 }
205
206 return E_OUTOFMEMORY;
207}
208
209/***********************************************************************
210 * GetHGlobalFromStream [OLE32.71]
211 */
212HRESULT WINAPI GetHGlobalFromStream(IStream* pstm, HGLOBAL* phglobal)
213{
214 HGLOBALStreamImpl* pStream;
215
216 if (pstm == NULL)
217 return E_INVALIDARG;
218
219 pStream = (HGLOBALStreamImpl*) pstm;
220
221 /*
222 * Verify that the stream object was created with CreateStreamOnHGlobal.
223 */
224 if (ICOM_VTBL(pStream) == &HGLOBALStreamImpl_Vtbl)
225 *phglobal = pStream->supportHandle;
226 else
227 {
228 *phglobal = 0;
229 return E_INVALIDARG;
230 }
231
232 return S_OK;
233}
234
235/******************************************************************************
236** HGLOBALStreamImpl implementation
237*/
238
239/***
240 * This is the constructor for the HGLOBALStreamImpl class.
241 *
242 * Params:
243 * hGlobal - Handle that will support the stream. can be NULL.
244 * fDeleteOnRelease - Flag set to TRUE if the HGLOBAL will be released
245 * when the IStream object is destroyed.
246 */
247HGLOBALStreamImpl* HGLOBALStreamImpl_Construct(
248 HGLOBAL hGlobal,
249 BOOL fDeleteOnRelease)
250{
251 HGLOBALStreamImpl* newStream;
252
253 newStream = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALStreamImpl));
254
255 if (newStream!=0)
256 {
257 /*
258 * Set-up the virtual function table and reference count.
259 */
260 ICOM_VTBL(newStream) = &HGLOBALStreamImpl_Vtbl;
261 newStream->ref = 0;
262
263 /*
264 * Initialize the support.
265 */
266 newStream->supportHandle = hGlobal;
267 newStream->deleteOnRelease = fDeleteOnRelease;
268
269 /*
270 * This method will allocate a handle if one is not supplied.
271 */
272 if (!newStream->supportHandle)
273 {
274 newStream->supportHandle = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD |
275 GMEM_SHARE, 0);
276 }
277
278 /*
279 * Start the stream at the beginning.
280 */
281 newStream->currentPosition.s.HighPart = 0;
282 newStream->currentPosition.s.LowPart = 0;
283
284 /*
285 * Initialize the size of the stream to the size of the handle.
286 */
287 newStream->streamSize.s.HighPart = 0;
288 newStream->streamSize.s.LowPart = GlobalSize(newStream->supportHandle);
289 }
290
291 return newStream;
292}
293
294/***
295 * This is the destructor of the HGLOBALStreamImpl class.
296 *
297 * This method will clean-up all the resources used-up by the given HGLOBALStreamImpl
298 * class. The pointer passed-in to this function will be freed and will not
299 * be valid anymore.
300 */
301void HGLOBALStreamImpl_Destroy(HGLOBALStreamImpl* This)
302{
303 TRACE("(%p)\n", This);
304
305 /*
306 * Release the HGlobal if the constructor asked for that.
307 */
308 if (This->deleteOnRelease)
309 {
310 GlobalFree(This->supportHandle);
311 This->supportHandle=0;
312 }
313
314 /*
315 * Finally, free the memory used-up by the class.
316 */
317 HeapFree(GetProcessHeap(), 0, This);
318}
319
320/***
321 * This implements the IUnknown method QueryInterface for this
322 * class
323 */
324HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
325 IStream* iface,
326 REFIID riid, /* [in] */
327 void** ppvObject) /* [iid_is][out] */
328{
329 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
330
331 /*
332 * Perform a sanity check on the parameters.
333 */
334 if (ppvObject==0)
335 return E_INVALIDARG;
336
337 /*
338 * Initialize the return parameter.
339 */
340 *ppvObject = 0;
341
342 /*
343 * Compare the riid with the interface IDs implemented by this object.
344 */
345 if (memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) == 0)
346 {
347 *ppvObject = (IStream*)This;
348 }
349 else if (memcmp(&IID_IStream, riid, sizeof(IID_IStream)) == 0)
350 {
351 *ppvObject = (IStream*)This;
352 }
353
354 /*
355 * Check that we obtained an interface.
356 */
357 if ((*ppvObject)==0)
358 return E_NOINTERFACE;
359
360 /*
361 * Query Interface always increases the reference count by one when it is
362 * successful
363 */
364 HGLOBALStreamImpl_AddRef(iface);
365
366 return S_OK;
367}
368
369/***
370 * This implements the IUnknown method AddRef for this
371 * class
372 */
373ULONG WINAPI HGLOBALStreamImpl_AddRef(
374 IStream* iface)
375{
376 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
377
378 This->ref++;
379
380 return This->ref;
381}
382
383/***
384 * This implements the IUnknown method Release for this
385 * class
386 */
387ULONG WINAPI HGLOBALStreamImpl_Release(
388 IStream* iface)
389{
390 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
391
392 ULONG newRef;
393
394 This->ref--;
395
396 newRef = This->ref;
397
398 /*
399 * If the reference count goes down to 0, perform suicide.
400 */
401 if (newRef==0)
402 {
403 HGLOBALStreamImpl_Destroy(This);
404 }
405
406 return newRef;
407}
408
409/***
410 * This method is part of the ISequentialStream interface.
411 *
412 * If reads a block of information from the stream at the current
413 * position. It then moves the current position at the end of the
414 * read block
415 *
416 * See the documentation of ISequentialStream for more info.
417 */
418HRESULT WINAPI HGLOBALStreamImpl_Read(
419 IStream* iface,
420 void* pv, /* [length_is][size_is][out] */
421 ULONG cb, /* [in] */
422 ULONG* pcbRead) /* [out] */
423{
424 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
425
426 void* supportBuffer;
427 ULONG bytesReadBuffer;
428 ULONG bytesToReadFromBuffer;
429
430 TRACE("(%p, %p, %ld, %p)\n", iface,
431 pv, cb, pcbRead);
432
433 /*
434 * If the caller is not interested in the nubmer of bytes read,
435 * we use another buffer to avoid "if" statements in the code.
436 */
437 if (pcbRead==0)
438 pcbRead = &bytesReadBuffer;
439
440 /*
441 * Using the known size of the stream, calculate the number of bytes
442 * to read from the block chain
443 */
444 bytesToReadFromBuffer = min( This->streamSize.s.LowPart - This->currentPosition.s.LowPart, cb);
445
446 /*
447 * Lock the buffer in position and copy the data.
448 */
449 supportBuffer = GlobalLock(This->supportHandle);
450
451 memcpy(pv, (char *) supportBuffer+This->currentPosition.s.LowPart, bytesToReadFromBuffer);
452
453 /*
454 * Move the current position to the new position
455 */
456 This->currentPosition.s.LowPart+=bytesToReadFromBuffer;
457
458 /*
459 * Return the number of bytes read.
460 */
461 *pcbRead = bytesToReadFromBuffer;
462
463 /*
464 * Cleanup
465 */
466 GlobalUnlock(This->supportHandle);
467
468 /*
469 * The function returns S_OK if the buffer was filled completely
470 * it returns S_FALSE if the end of the stream is reached before the
471 * buffer is filled
472 */
473 if(*pcbRead == cb)
474 return S_OK;
475
476 return S_FALSE;
477}
478
479/***
480 * This method is part of the ISequentialStream interface.
481 *
482 * It writes a block of information to the stream at the current
483 * position. It then moves the current position at the end of the
484 * written block. If the stream is too small to fit the block,
485 * the stream is grown to fit.
486 *
487 * See the documentation of ISequentialStream for more info.
488 */
489HRESULT WINAPI HGLOBALStreamImpl_Write(
490 IStream* iface,
491 const void* pv, /* [size_is][in] */
492 ULONG cb, /* [in] */
493 ULONG* pcbWritten) /* [out] */
494{
495 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
496
497 void* supportBuffer;
498 ULARGE_INTEGER newSize;
499 ULONG bytesWritten = 0;
500
501 TRACE("(%p, %p, %ld, %p)\n", iface,
502 pv, cb, pcbWritten);
503
504 /*
505 * If the caller is not interested in the number of bytes written,
506 * we use another buffer to avoid "if" statements in the code.
507 */
508 if (pcbWritten == 0)
509 pcbWritten = &bytesWritten;
510
511 if (cb == 0)
512 {
513 return S_OK;
514 }
515 else
516 {
517 newSize.s.HighPart = 0;
518 newSize.s.LowPart = This->currentPosition.s.LowPart + cb;
519 }
520
521 /*
522 * Verify if we need to grow the stream
523 */
524 if (newSize.s.LowPart > This->streamSize.s.LowPart)
525 {
526 /* grow stream */
527 IStream_SetSize(iface, newSize);
528 }
529
530 /*
531 * Lock the buffer in position and copy the data.
532 */
533 supportBuffer = GlobalLock(This->supportHandle);
534
535 memcpy((char *) supportBuffer+This->currentPosition.s.LowPart, pv, cb);
536
537 /*
538 * Move the current position to the new position
539 */
540 This->currentPosition.s.LowPart+=cb;
541
542 /*
543 * Return the number of bytes read.
544 */
545 *pcbWritten = cb;
546
547 /*
548 * Cleanup
549 */
550 GlobalUnlock(This->supportHandle);
551
552 return S_OK;
553}
554
555/***
556 * This method is part of the IStream interface.
557 *
558 * It will move the current stream pointer according to the parameters
559 * given.
560 *
561 * See the documentation of IStream for more info.
562 */
563HRESULT WINAPI HGLOBALStreamImpl_Seek(
564 IStream* iface,
565 LARGE_INTEGER dlibMove, /* [in] */
566 DWORD dwOrigin, /* [in] */
567 ULARGE_INTEGER* plibNewPosition) /* [out] */
568{
569 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
570
571 ULARGE_INTEGER newPosition;
572
573 TRACE("(%p, %ld, %ld, %p)\n", iface,
574 dlibMove.s.LowPart, dwOrigin, plibNewPosition);
575
576 /*
577 * The file pointer is moved depending on the given "function"
578 * parameter.
579 */
580 switch (dwOrigin)
581 {
582 case STREAM_SEEK_SET:
583 newPosition.s.HighPart = 0;
584 newPosition.s.LowPart = 0;
585 break;
586 case STREAM_SEEK_CUR:
587 newPosition = This->currentPosition;
588 break;
589 case STREAM_SEEK_END:
590 newPosition = This->streamSize;
591 break;
592 default:
593 return STG_E_INVALIDFUNCTION;
594 }
595
596 /*
597 * Move the actual file pointer
598 * If the file pointer ends-up after the end of the stream, the next Write operation will
599 * make the file larger. This is how it is documented.
600 */
601#ifdef __WIN32OS2__
602 *(LARGE_INTEGER *)&newPosition = RtlpLargeIntegerAdd( (LARGE_INTEGER *)&newPosition, &dlibMove );
603#else
604 newPosition.QuadPart = RtlLargeIntegerAdd(newPosition.QuadPart, dlibMove.QuadPart);
605#endif
606 if (newPosition.QuadPart < 0) return STG_E_INVALIDFUNCTION;
607
608 if (plibNewPosition) *plibNewPosition = newPosition;
609 This->currentPosition = newPosition;
610
611 return S_OK;
612}
613
614/***
615 * This method is part of the IStream interface.
616 *
617 * It will change the size of a stream.
618 *
619 * TODO: Switch from small blocks to big blocks and vice versa.
620 *
621 * See the documentation of IStream for more info.
622 */
623HRESULT WINAPI HGLOBALStreamImpl_SetSize(
624 IStream* iface,
625 ULARGE_INTEGER libNewSize) /* [in] */
626{
627 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
628
629 TRACE("(%p, %ld)\n", iface, libNewSize.s.LowPart);
630
631 /*
632 * As documented.
633 */
634 if (libNewSize.s.HighPart != 0)
635 return STG_E_INVALIDFUNCTION;
636
637 if (This->streamSize.s.LowPart == libNewSize.s.LowPart)
638 return S_OK;
639
640 /*
641 * Re allocate the HGlobal to fit the new size of the stream.
642 */
643 This->supportHandle = GlobalReAlloc(This->supportHandle,
644 libNewSize.s.LowPart,
645 0);
646
647 This->streamSize.s.LowPart = libNewSize.s.LowPart;
648
649 return S_OK;
650}
651
652/***
653 * This method is part of the IStream interface.
654 *
655 * It will copy the 'cb' Bytes to 'pstm' IStream.
656 *
657 * See the documentation of IStream for more info.
658 */
659HRESULT WINAPI HGLOBALStreamImpl_CopyTo(
660 IStream* iface,
661 IStream* pstm, /* [unique][in] */
662 ULARGE_INTEGER cb, /* [in] */
663 ULARGE_INTEGER* pcbRead, /* [out] */
664 ULARGE_INTEGER* pcbWritten) /* [out] */
665{
666 HRESULT hr = S_OK;
667 BYTE tmpBuffer[128];
668 ULONG bytesRead, bytesWritten, copySize;
669 ULARGE_INTEGER totalBytesRead;
670 ULARGE_INTEGER totalBytesWritten;
671
672 TRACE("(%p, %p, %ld, %p, %p)\n", iface, pstm,
673 cb.s.LowPart, pcbRead, pcbWritten);
674
675 /*
676 * Sanity check
677 */
678 if ( pstm == 0 )
679 return STG_E_INVALIDPOINTER;
680
681 totalBytesRead.s.LowPart = totalBytesRead.s.HighPart = 0;
682 totalBytesWritten.s.LowPart = totalBytesWritten.s.HighPart = 0;
683
684 /*
685 * use stack to store data temporarly
686 * there is surely more performant way of doing it, for now this basic
687 * implementation will do the job
688 */
689 while ( cb.s.LowPart > 0 )
690 {
691 if ( cb.s.LowPart >= 128 )
692 copySize = 128;
693 else
694 copySize = cb.s.LowPart;
695
696 IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
697
698 totalBytesRead.s.LowPart += bytesRead;
699
700 IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
701
702 totalBytesWritten.s.LowPart += bytesWritten;
703
704 /*
705 * Check that read & write operations were succesfull
706 */
707 if (bytesRead != bytesWritten)
708 {
709 hr = STG_E_MEDIUMFULL;
710 break;
711 }
712
713 if (bytesRead!=copySize)
714 cb.s.LowPart = 0;
715 else
716 cb.s.LowPart -= bytesRead;
717 }
718
719 /*
720 * Update number of bytes read and written
721 */
722 if (pcbRead)
723 {
724 pcbRead->s.LowPart = totalBytesRead.s.LowPart;
725 pcbRead->s.HighPart = totalBytesRead.s.HighPart;
726 }
727
728 if (pcbWritten)
729 {
730 pcbWritten->s.LowPart = totalBytesWritten.s.LowPart;
731 pcbWritten->s.HighPart = totalBytesWritten.s.HighPart;
732 }
733 return hr;
734}
735
736/***
737 * This method is part of the IStream interface.
738 *
739 * For streams supported by HGLOBALS, this function does nothing.
740 * This is what the documentation tells us.
741 *
742 * See the documentation of IStream for more info.
743 */
744HRESULT WINAPI HGLOBALStreamImpl_Commit(
745 IStream* iface,
746 DWORD grfCommitFlags) /* [in] */
747{
748 return S_OK;
749}
750
751/***
752 * This method is part of the IStream interface.
753 *
754 * For streams supported by HGLOBALS, this function does nothing.
755 * This is what the documentation tells us.
756 *
757 * See the documentation of IStream for more info.
758 */
759HRESULT WINAPI HGLOBALStreamImpl_Revert(
760 IStream* iface)
761{
762 return S_OK;
763}
764
765/***
766 * This method is part of the IStream interface.
767 *
768 * For streams supported by HGLOBALS, this function does nothing.
769 * This is what the documentation tells us.
770 *
771 * See the documentation of IStream for more info.
772 */
773HRESULT WINAPI HGLOBALStreamImpl_LockRegion(
774 IStream* iface,
775 ULARGE_INTEGER libOffset, /* [in] */
776 ULARGE_INTEGER cb, /* [in] */
777 DWORD dwLockType) /* [in] */
778{
779 return S_OK;
780}
781
782/*
783 * This method is part of the IStream interface.
784 *
785 * For streams supported by HGLOBALS, this function does nothing.
786 * This is what the documentation tells us.
787 *
788 * See the documentation of IStream for more info.
789 */
790HRESULT WINAPI HGLOBALStreamImpl_UnlockRegion(
791 IStream* iface,
792 ULARGE_INTEGER libOffset, /* [in] */
793 ULARGE_INTEGER cb, /* [in] */
794 DWORD dwLockType) /* [in] */
795{
796 return S_OK;
797}
798
799/***
800 * This method is part of the IStream interface.
801 *
802 * This method returns information about the current
803 * stream.
804 *
805 * See the documentation of IStream for more info.
806 */
807HRESULT WINAPI HGLOBALStreamImpl_Stat(
808 IStream* iface,
809 STATSTG* pstatstg, /* [out] */
810 DWORD grfStatFlag) /* [in] */
811{
812 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
813
814 memset(pstatstg, 0, sizeof(STATSTG));
815
816 pstatstg->pwcsName = NULL;
817 pstatstg->type = STGTY_STREAM;
818 pstatstg->cbSize = This->streamSize;
819
820 return S_OK;
821}
822
823HRESULT WINAPI HGLOBALStreamImpl_Clone(
824 IStream* iface,
825 IStream** ppstm) /* [out] */
826{
827 ULARGE_INTEGER dummy;
828 LARGE_INTEGER offset;
829 HRESULT hr;
830 HGLOBALStreamImpl* const This=(HGLOBALStreamImpl*)iface;
831 TRACE(" Cloning %p (deleteOnRelease=%d seek position=%ld)\n",iface,This->deleteOnRelease,(long)This->currentPosition.QuadPart);
832 hr=CreateStreamOnHGlobal(This->supportHandle, FALSE, ppstm);
833 if(FAILED(hr))
834 return hr;
835 offset.QuadPart=(LONGLONG)This->currentPosition.QuadPart;
836 HGLOBALStreamImpl_Seek(*ppstm,offset,STREAM_SEEK_SET,&dummy);
837 return S_OK;
838}
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