2 * Compound Storage (32 bit version)
3 * Stream implementation
5 * This file contains the implementation of the stream interface
6 * for streams contained in a compound storage.
8 * Copyright 1999 Francis Beaudet
9 * Copyright 1999 Thuy Nguyen
19 #include "debugtools.h"
21 #include "storage32.h"
23 DEFAULT_DEBUG_CHANNEL(storage
);
27 * Virtual function table for the StgStreamImpl class.
29 static ICOM_VTABLE(IStream
) StgStreamImpl_Vtbl
=
31 ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
32 StgStreamImpl_QueryInterface
,
34 StgStreamImpl_Release
,
38 StgStreamImpl_SetSize
,
42 StgStreamImpl_LockRegion
,
43 StgStreamImpl_UnlockRegion
,
48 /******************************************************************************
49 ** StgStreamImpl implementation
53 * This is the constructor for the StgStreamImpl class.
56 * parentStorage - Pointer to the storage that contains the stream to open
57 * ownerProperty - Index of the property that points to this stream.
59 StgStreamImpl
* StgStreamImpl_Construct(
60 StorageBaseImpl
* parentStorage
,
64 StgStreamImpl
* newStream
;
66 newStream
= HeapAlloc(GetProcessHeap(), 0, sizeof(StgStreamImpl
));
71 * Set-up the virtual function table and reference count.
73 ICOM_VTBL(newStream
) = &StgStreamImpl_Vtbl
;
77 * We want to nail-down the reference to the storage in case the
78 * stream out-lives the storage in the client application.
80 newStream
->parentStorage
= parentStorage
;
81 IStorage_AddRef((IStorage
*)newStream
->parentStorage
);
83 newStream
->grfMode
= grfMode
;
84 newStream
->ownerProperty
= ownerProperty
;
87 * Start the stream at the begining.
89 newStream
->currentPosition
.s
.HighPart
= 0;
90 newStream
->currentPosition
.s
.LowPart
= 0;
93 * Initialize the rest of the data.
95 newStream
->streamSize
.s
.HighPart
= 0;
96 newStream
->streamSize
.s
.LowPart
= 0;
97 newStream
->bigBlockChain
= 0;
98 newStream
->smallBlockChain
= 0;
101 * Read the size from the property and determine if the blocks forming
102 * this stream are large or small.
104 StgStreamImpl_OpenBlockChain(newStream
);
111 * This is the destructor of the StgStreamImpl class.
113 * This method will clean-up all the resources used-up by the given StgStreamImpl
114 * class. The pointer passed-in to this function will be freed and will not
117 void StgStreamImpl_Destroy(StgStreamImpl
* This
)
119 TRACE("(%p)\n", This
);
122 * Release the reference we are holding on the parent storage.
124 IStorage_Release((IStorage
*)This
->parentStorage
);
125 This
->parentStorage
= 0;
128 * Make sure we clean-up the block chain stream objects that we were using.
130 if (This
->bigBlockChain
!= 0)
132 BlockChainStream_Destroy(This
->bigBlockChain
);
133 This
->bigBlockChain
= 0;
136 if (This
->smallBlockChain
!= 0)
138 SmallBlockChainStream_Destroy(This
->smallBlockChain
);
139 This
->smallBlockChain
= 0;
143 * Finally, free the memory used-up by the class.
145 HeapFree(GetProcessHeap(), 0, This
);
149 * This implements the IUnknown method QueryInterface for this
152 HRESULT WINAPI
StgStreamImpl_QueryInterface(
154 REFIID riid
, /* [in] */
155 void** ppvObject
) /* [iid_is][out] */
157 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
160 * Perform a sanity check on the parameters.
166 * Initialize the return parameter.
171 * Compare the riid with the interface IDs implemented by this object.
173 if (memcmp(&IID_IUnknown
, riid
, sizeof(IID_IUnknown
)) == 0)
175 *ppvObject
= (IStream
*)This
;
177 else if (memcmp(&IID_IStream
, riid
, sizeof(IID_IStream
)) == 0)
179 *ppvObject
= (IStream
*)This
;
183 * Check that we obtained an interface.
186 return E_NOINTERFACE
;
189 * Query Interface always increases the reference count by one when it is
192 StgStreamImpl_AddRef(iface
);
198 * This implements the IUnknown method AddRef for this
201 ULONG WINAPI
StgStreamImpl_AddRef(
204 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
212 * This implements the IUnknown method Release for this
215 ULONG WINAPI
StgStreamImpl_Release(
218 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
227 * If the reference count goes down to 0, perform suicide.
231 StgStreamImpl_Destroy(This
);
238 * This method will open the block chain pointed by the property
239 * that describes the stream.
240 * If the stream's size is null, no chain is opened.
242 void StgStreamImpl_OpenBlockChain(
245 StgProperty curProperty
;
249 * Make sure no old object is staying behind.
251 if (This
->smallBlockChain
!= 0)
253 SmallBlockChainStream_Destroy(This
->smallBlockChain
);
254 This
->smallBlockChain
= 0;
257 if (This
->bigBlockChain
!= 0)
259 BlockChainStream_Destroy(This
->bigBlockChain
);
260 This
->bigBlockChain
= 0;
264 * Read the information from the property.
266 readSucessful
= StorageImpl_ReadProperty(This
->parentStorage
->ancestorStorage
,
272 This
->streamSize
= curProperty
.size
;
275 * This code supports only streams that are <32 bits in size.
277 assert(This
->streamSize
.s
.HighPart
== 0);
279 if(curProperty
.startingBlock
== BLOCK_END_OF_CHAIN
)
281 assert( (This
->streamSize
.s
.HighPart
== 0) && (This
->streamSize
.s
.LowPart
== 0) );
285 if ( (This
->streamSize
.s
.HighPart
== 0) &&
286 (This
->streamSize
.s
.LowPart
< LIMIT_TO_USE_SMALL_BLOCK
) )
288 This
->smallBlockChain
= SmallBlockChainStream_Construct(
289 This
->parentStorage
->ancestorStorage
,
290 This
->ownerProperty
);
294 This
->bigBlockChain
= BlockChainStream_Construct(
295 This
->parentStorage
->ancestorStorage
,
297 This
->ownerProperty
);
304 * This method is part of the ISequentialStream interface.
306 * If reads a block of information from the stream at the current
307 * position. It then moves the current position at the end of the
310 * See the documentation of ISequentialStream for more info.
312 HRESULT WINAPI
StgStreamImpl_Read(
314 void* pv
, /* [length_is][size_is][out] */
316 ULONG
* pcbRead
) /* [out] */
318 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
320 ULONG bytesReadBuffer
;
321 ULONG bytesToReadFromBuffer
;
323 TRACE("(%p, %p, %ld, %p)\n",
324 iface
, pv
, cb
, pcbRead
);
327 * If the caller is not interested in the nubmer of bytes read,
328 * we use another buffer to avoid "if" statements in the code.
331 pcbRead
= &bytesReadBuffer
;
334 * Using the known size of the stream, calculate the number of bytes
335 * to read from the block chain
337 bytesToReadFromBuffer
= min( This
->streamSize
.s
.LowPart
- This
->currentPosition
.s
.LowPart
, cb
);
340 * Depending on the type of chain that was opened when the stream was constructed,
341 * we delegate the work to the method that read the block chains.
343 if (This
->smallBlockChain
!=0)
345 SmallBlockChainStream_ReadAt(This
->smallBlockChain
,
346 This
->currentPosition
,
347 bytesToReadFromBuffer
,
352 else if (This
->bigBlockChain
!=0)
354 BlockChainStream_ReadAt(This
->bigBlockChain
,
355 This
->currentPosition
,
356 bytesToReadFromBuffer
,
363 * Small and big block chains are both NULL. This case will happen
364 * when a stream starts with BLOCK_END_OF_CHAIN and has size zero.
372 * We should always be able to read the proper amount of data from the
375 assert(bytesToReadFromBuffer
== *pcbRead
);
378 * Advance the pointer for the number of positions read.
380 This
->currentPosition
.s
.LowPart
+= *pcbRead
;
383 * The function returns S_OK if the buffer was filled completely
384 * it returns S_FALSE if the end of the stream is reached before the
394 * This method is part of the ISequentialStream interface.
396 * It writes a block of information to the stream at the current
397 * position. It then moves the current position at the end of the
398 * written block. If the stream is too small to fit the block,
399 * the stream is grown to fit.
401 * See the documentation of ISequentialStream for more info.
403 HRESULT WINAPI
StgStreamImpl_Write(
405 const void* pv
, /* [size_is][in] */
407 ULONG
* pcbWritten
) /* [out] */
409 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
411 ULARGE_INTEGER newSize
;
412 ULONG bytesWritten
= 0;
414 TRACE("(%p, %p, %ld, %p)\n",
415 iface
, pv
, cb
, pcbWritten
);
418 * Do we have permission to write to this stream?
420 if (!(This
->grfMode
& (STGM_WRITE
| STGM_READWRITE
))) {
421 return STG_E_ACCESSDENIED
;
425 * If the caller is not interested in the number of bytes written,
426 * we use another buffer to avoid "if" statements in the code.
429 pcbWritten
= &bytesWritten
;
432 * Initialize the out parameter
442 newSize
.s
.HighPart
= 0;
443 newSize
.s
.LowPart
= This
->currentPosition
.s
.LowPart
+ cb
;
447 * Verify if we need to grow the stream
449 if (newSize
.s
.LowPart
> This
->streamSize
.s
.LowPart
)
452 IStream_SetSize(iface
, newSize
);
456 * Depending on the type of chain that was opened when the stream was constructed,
457 * we delegate the work to the method that readwrites to the block chains.
459 if (This
->smallBlockChain
!=0)
461 SmallBlockChainStream_WriteAt(This
->smallBlockChain
,
462 This
->currentPosition
,
468 else if (This
->bigBlockChain
!=0)
470 BlockChainStream_WriteAt(This
->bigBlockChain
,
471 This
->currentPosition
,
480 * Advance the position pointer for the number of positions written.
482 This
->currentPosition
.s
.LowPart
+= *pcbWritten
;
488 * This method is part of the IStream interface.
490 * It will move the current stream pointer according to the parameters
493 * See the documentation of IStream for more info.
495 HRESULT WINAPI
StgStreamImpl_Seek(
497 LARGE_INTEGER dlibMove
, /* [in] */
498 DWORD dwOrigin
, /* [in] */
499 ULARGE_INTEGER
* plibNewPosition
) /* [out] */
501 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
503 ULARGE_INTEGER newPosition
;
505 TRACE("(%p, %ld, %ld, %p)\n",
506 iface
, dlibMove
.s
.LowPart
, dwOrigin
, plibNewPosition
);
509 * The caller is allowed to pass in NULL as the new position return value.
510 * If it happens, we assign it to a dynamic variable to avoid special cases
513 if (plibNewPosition
== 0)
515 plibNewPosition
= &newPosition
;
519 * The file pointer is moved depending on the given "function"
524 case STREAM_SEEK_SET
:
525 plibNewPosition
->s
.HighPart
= 0;
526 plibNewPosition
->s
.LowPart
= 0;
528 case STREAM_SEEK_CUR
:
529 *plibNewPosition
= This
->currentPosition
;
531 case STREAM_SEEK_END
:
532 *plibNewPosition
= This
->streamSize
;
535 return STG_E_INVALIDFUNCTION
;
538 plibNewPosition
->QuadPart
= RtlLargeIntegerAdd( plibNewPosition
->QuadPart
, dlibMove
.QuadPart
);
541 * tell the caller what we calculated
543 This
->currentPosition
= *plibNewPosition
;
549 * This method is part of the IStream interface.
551 * It will change the size of a stream.
553 * TODO: Switch from small blocks to big blocks and vice versa.
555 * See the documentation of IStream for more info.
557 HRESULT WINAPI
StgStreamImpl_SetSize(
559 ULARGE_INTEGER libNewSize
) /* [in] */
561 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
563 StgProperty curProperty
;
566 TRACE("(%p, %ld)\n", iface
, libNewSize
.s
.LowPart
);
571 if (libNewSize
.s
.HighPart
!= 0)
572 return STG_E_INVALIDFUNCTION
;
575 * Do we have permission?
577 if (!(This
->grfMode
& (STGM_WRITE
| STGM_READWRITE
)))
578 return STG_E_ACCESSDENIED
;
580 if (This
->streamSize
.s
.LowPart
== libNewSize
.s
.LowPart
)
584 * This will happen if we're creating a stream
586 if ((This
->smallBlockChain
== 0) && (This
->bigBlockChain
== 0))
588 if (libNewSize
.s
.LowPart
< LIMIT_TO_USE_SMALL_BLOCK
)
590 This
->smallBlockChain
= SmallBlockChainStream_Construct(
591 This
->parentStorage
->ancestorStorage
,
592 This
->ownerProperty
);
596 This
->bigBlockChain
= BlockChainStream_Construct(
597 This
->parentStorage
->ancestorStorage
,
599 This
->ownerProperty
);
604 * Read this stream's property to see if it's small blocks or big blocks
606 Success
= StorageImpl_ReadProperty(This
->parentStorage
->ancestorStorage
,
610 * Determine if we have to switch from small to big blocks or vice versa
612 if ( (This
->smallBlockChain
!=0) &&
613 (curProperty
.size
.s
.LowPart
< LIMIT_TO_USE_SMALL_BLOCK
) )
615 if (libNewSize
.s
.LowPart
>= LIMIT_TO_USE_SMALL_BLOCK
)
618 * Transform the small block chain into a big block chain
620 This
->bigBlockChain
= Storage32Impl_SmallBlocksToBigBlocks(
621 This
->parentStorage
->ancestorStorage
,
622 &This
->smallBlockChain
);
626 if (This
->smallBlockChain
!=0)
628 Success
= SmallBlockChainStream_SetSize(This
->smallBlockChain
, libNewSize
);
632 Success
= BlockChainStream_SetSize(This
->bigBlockChain
, libNewSize
);
636 * Write to the property the new information about this stream
638 Success
= StorageImpl_ReadProperty(This
->parentStorage
->ancestorStorage
,
642 curProperty
.size
.s
.HighPart
= libNewSize
.s
.HighPart
;
643 curProperty
.size
.s
.LowPart
= libNewSize
.s
.LowPart
;
647 StorageImpl_WriteProperty(This
->parentStorage
->ancestorStorage
,
652 This
->streamSize
= libNewSize
;
658 * This method is part of the IStream interface.
660 * It will copy the 'cb' Bytes to 'pstm' IStream.
662 * See the documentation of IStream for more info.
664 HRESULT WINAPI
StgStreamImpl_CopyTo(
666 IStream
* pstm
, /* [unique][in] */
667 ULARGE_INTEGER cb
, /* [in] */
668 ULARGE_INTEGER
* pcbRead
, /* [out] */
669 ULARGE_INTEGER
* pcbWritten
) /* [out] */
673 ULONG bytesRead
, bytesWritten
, copySize
;
674 ULARGE_INTEGER totalBytesRead
;
675 ULARGE_INTEGER totalBytesWritten
;
677 TRACE("(%p, %p, %ld, %p, %p)\n",
678 iface
, pstm
, cb
.s
.LowPart
, pcbRead
, pcbWritten
);
684 return STG_E_INVALIDPOINTER
;
686 totalBytesRead
.s
.LowPart
= totalBytesRead
.s
.HighPart
= 0;
687 totalBytesWritten
.s
.LowPart
= totalBytesWritten
.s
.HighPart
= 0;
690 * use stack to store data temporarly
691 * there is surely more performant way of doing it, for now this basic
692 * implementation will do the job
694 while ( cb
.s
.LowPart
> 0 )
696 if ( cb
.s
.LowPart
>= 128 )
699 copySize
= cb
.s
.LowPart
;
701 IStream_Read(iface
, tmpBuffer
, copySize
, &bytesRead
);
703 totalBytesRead
.s
.LowPart
+= bytesRead
;
705 IStream_Write(pstm
, tmpBuffer
, bytesRead
, &bytesWritten
);
707 totalBytesWritten
.s
.LowPart
+= bytesWritten
;
710 * Check that read & write operations were succesfull
712 if (bytesRead
!= bytesWritten
)
714 hr
= STG_E_MEDIUMFULL
;
718 if (bytesRead
!=copySize
)
721 cb
.s
.LowPart
-= bytesRead
;
725 * Update number of bytes read and written
729 pcbRead
->s
.LowPart
= totalBytesRead
.s
.LowPart
;
730 pcbRead
->s
.HighPart
= totalBytesRead
.s
.HighPart
;
735 pcbWritten
->s
.LowPart
= totalBytesWritten
.s
.LowPart
;
736 pcbWritten
->s
.HighPart
= totalBytesWritten
.s
.HighPart
;
742 * This method is part of the IStream interface.
744 * For streams contained in structured storages, this method
745 * does nothing. This is what the documentation tells us.
747 * See the documentation of IStream for more info.
749 HRESULT WINAPI
StgStreamImpl_Commit(
751 DWORD grfCommitFlags
) /* [in] */
757 * This method is part of the IStream interface.
759 * For streams contained in structured storages, this method
760 * does nothing. This is what the documentation tells us.
762 * See the documentation of IStream for more info.
764 HRESULT WINAPI
StgStreamImpl_Revert(
770 HRESULT WINAPI
StgStreamImpl_LockRegion(
772 ULARGE_INTEGER libOffset
, /* [in] */
773 ULARGE_INTEGER cb
, /* [in] */
774 DWORD dwLockType
) /* [in] */
776 FIXME("not implemented!\n");
780 HRESULT WINAPI
StgStreamImpl_UnlockRegion(
782 ULARGE_INTEGER libOffset
, /* [in] */
783 ULARGE_INTEGER cb
, /* [in] */
784 DWORD dwLockType
) /* [in] */
786 FIXME("not implemented!\n");
791 * This method is part of the IStream interface.
793 * This method returns information about the current
796 * See the documentation of IStream for more info.
798 HRESULT WINAPI
StgStreamImpl_Stat(
800 STATSTG
* pstatstg
, /* [out] */
801 DWORD grfStatFlag
) /* [in] */
803 StgStreamImpl
* const This
=(StgStreamImpl
*)iface
;
805 StgProperty curProperty
;
809 * Read the information from the property.
811 readSucessful
= StorageImpl_ReadProperty(This
->parentStorage
->ancestorStorage
,
817 StorageUtl_CopyPropertyToSTATSTG(pstatstg
,
821 pstatstg
->grfMode
= This
->grfMode
;
829 HRESULT WINAPI
StgStreamImpl_Clone(
831 IStream
** ppstm
) /* [out] */
833 FIXME("not implemented!\n");