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
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
33 #define NONAMELESSUNION
34 #define NONAMELESSSTRUCT
40 #include "wine/debug.h"
42 #include "storage32.h"
44 WINE_DEFAULT_DEBUG_CHANNEL(storage);
47 * This implements the IUnknown method QueryInterface for this
50 static HRESULT WINAPI StgStreamImpl_QueryInterface(
52 REFIID riid, /* [in] */
53 void** ppvObject) /* [iid_is][out] */
55 StgStreamImpl* This = impl_from_IStream(iface);
62 if (IsEqualIID(&IID_IUnknown, riid) ||
63 IsEqualIID(&IID_ISequentialStream, riid) ||
64 IsEqualIID(&IID_IStream, riid))
66 *ppvObject = &This->IStream_iface;
71 IStream_AddRef(iface);
77 * This implements the IUnknown method AddRef for this
80 static ULONG WINAPI StgStreamImpl_AddRef(
83 StgStreamImpl* This = impl_from_IStream(iface);
84 return InterlockedIncrement(&This->ref);
88 * This implements the IUnknown method Release for this
91 static ULONG WINAPI StgStreamImpl_Release(
94 StgStreamImpl* This = impl_from_IStream(iface);
95 ULONG ref = InterlockedDecrement(&This->ref);
99 TRACE("(%p)\n", This);
102 * Release the reference we are holding on the parent storage.
103 * IStorage_Release(&This->parentStorage->IStorage_iface);
105 * No, don't do this. Some apps call IStorage_Release without
106 * calling IStream_Release first. If we grab a reference the
107 * file is not closed, and the app fails when it tries to
108 * reopen the file (Easy-PC, for example). Just inform the
109 * storage that we have closed the stream
112 if (This->parentStorage)
113 StorageBaseImpl_RemoveStream(This->parentStorage, This);
114 This->parentStorage = 0;
115 HeapFree(GetProcessHeap(), 0, This);
122 * This method is part of the ISequentialStream interface.
124 * It reads a block of information from the stream at the current
125 * position. It then moves the current position at the end of the
128 * See the documentation of ISequentialStream for more info.
130 static HRESULT WINAPI StgStreamImpl_Read(
132 void* pv, /* [length_is][size_is][out] */
134 ULONG* pcbRead) /* [out] */
136 StgStreamImpl* This = impl_from_IStream(iface);
138 ULONG bytesReadBuffer;
141 TRACE("(%p, %p, %d, %p)\n",
142 iface, pv, cb, pcbRead);
144 if (!This->parentStorage)
146 WARN("storage reverted\n");
147 return STG_E_REVERTED;
151 * If the caller is not interested in the number of bytes read,
152 * we use another buffer to avoid "if" statements in the code.
155 pcbRead = &bytesReadBuffer;
157 res = StorageBaseImpl_StreamReadAt(This->parentStorage,
159 This->currentPosition,
167 * Advance the pointer for the number of positions read.
169 This->currentPosition.u.LowPart += *pcbRead;
172 TRACE("<-- %08x\n", res);
177 * This method is part of the ISequentialStream interface.
179 * It writes a block of information to the stream at the current
180 * position. It then moves the current position at the end of the
181 * written block. If the stream is too small to fit the block,
182 * the stream is grown to fit.
184 * See the documentation of ISequentialStream for more info.
186 static HRESULT WINAPI StgStreamImpl_Write(
188 const void* pv, /* [size_is][in] */
190 ULONG* pcbWritten) /* [out] */
192 StgStreamImpl* This = impl_from_IStream(iface);
194 ULONG bytesWritten = 0;
197 TRACE("(%p, %p, %d, %p)\n",
198 iface, pv, cb, pcbWritten);
201 * Do we have permission to write to this stream?
203 switch(STGM_ACCESS_MODE(This->grfMode))
209 WARN("access denied by flags: 0x%x\n", STGM_ACCESS_MODE(This->grfMode));
210 return STG_E_ACCESSDENIED;
214 return STG_E_INVALIDPOINTER;
216 if (!This->parentStorage)
218 WARN("storage reverted\n");
219 return STG_E_REVERTED;
223 * If the caller is not interested in the number of bytes written,
224 * we use another buffer to avoid "if" statements in the code.
227 pcbWritten = &bytesWritten;
230 * Initialize the out parameter
236 TRACE("<-- S_OK, written 0\n");
240 res = StorageBaseImpl_StreamWriteAt(This->parentStorage,
242 This->currentPosition,
248 * Advance the position pointer for the number of positions written.
250 This->currentPosition.u.LowPart += *pcbWritten;
253 res = StorageBaseImpl_Flush(This->parentStorage);
255 TRACE("<-- S_OK, written %u\n", *pcbWritten);
260 * This method is part of the IStream interface.
262 * It will move the current stream pointer according to the parameters
265 * See the documentation of IStream for more info.
267 static HRESULT WINAPI StgStreamImpl_Seek(
269 LARGE_INTEGER dlibMove, /* [in] */
270 DWORD dwOrigin, /* [in] */
271 ULARGE_INTEGER* plibNewPosition) /* [out] */
273 StgStreamImpl* This = impl_from_IStream(iface);
275 ULARGE_INTEGER newPosition;
276 DirEntry currentEntry;
279 TRACE("(%p, %d, %d, %p)\n",
280 iface, dlibMove.u.LowPart, dwOrigin, plibNewPosition);
283 * fail if the stream has no parent (as does windows)
286 if (!This->parentStorage)
288 WARN("storage reverted\n");
289 return STG_E_REVERTED;
293 * The caller is allowed to pass in NULL as the new position return value.
294 * If it happens, we assign it to a dynamic variable to avoid special cases
297 if (plibNewPosition == 0)
299 plibNewPosition = &newPosition;
303 * The file pointer is moved depending on the given "function"
308 case STREAM_SEEK_SET:
309 plibNewPosition->u.HighPart = 0;
310 plibNewPosition->u.LowPart = 0;
312 case STREAM_SEEK_CUR:
313 *plibNewPosition = This->currentPosition;
315 case STREAM_SEEK_END:
316 hr = StorageBaseImpl_ReadDirEntry(This->parentStorage, This->dirEntry, ¤tEntry);
317 if (FAILED(hr)) return hr;
318 *plibNewPosition = currentEntry.size;
321 WARN("invalid dwOrigin %d\n", dwOrigin);
322 return STG_E_INVALIDFUNCTION;
325 plibNewPosition->QuadPart += dlibMove.QuadPart;
328 * tell the caller what we calculated
330 This->currentPosition = *plibNewPosition;
336 * This method is part of the IStream interface.
338 * It will change the size of a stream.
340 * See the documentation of IStream for more info.
342 static HRESULT WINAPI StgStreamImpl_SetSize(
344 ULARGE_INTEGER libNewSize) /* [in] */
346 StgStreamImpl* This = impl_from_IStream(iface);
350 TRACE("(%p, %d)\n", iface, libNewSize.u.LowPart);
352 if(!This->parentStorage)
354 WARN("storage reverted\n");
355 return STG_E_REVERTED;
361 if (libNewSize.u.HighPart != 0)
363 WARN("invalid value for libNewSize.u.HighPart %d\n", libNewSize.u.HighPart);
364 return STG_E_INVALIDFUNCTION;
368 * Do we have permission?
370 if (!(This->grfMode & (STGM_WRITE | STGM_READWRITE)))
372 WARN("access denied\n");
373 return STG_E_ACCESSDENIED;
376 hr = StorageBaseImpl_StreamSetSize(This->parentStorage, This->dirEntry, libNewSize);
379 hr = StorageBaseImpl_Flush(This->parentStorage);
385 * This method is part of the IStream interface.
387 * It will copy the 'cb' Bytes to 'pstm' IStream.
389 * See the documentation of IStream for more info.
391 static HRESULT WINAPI StgStreamImpl_CopyTo(
393 IStream* pstm, /* [unique][in] */
394 ULARGE_INTEGER cb, /* [in] */
395 ULARGE_INTEGER* pcbRead, /* [out] */
396 ULARGE_INTEGER* pcbWritten) /* [out] */
398 StgStreamImpl* This = impl_from_IStream(iface);
401 ULONG bytesRead, bytesWritten, copySize;
402 ULARGE_INTEGER totalBytesRead;
403 ULARGE_INTEGER totalBytesWritten;
405 TRACE("(%p, %p, %d, %p, %p)\n",
406 iface, pstm, cb.u.LowPart, pcbRead, pcbWritten);
412 if (!This->parentStorage)
414 WARN("storage reverted\n");
415 return STG_E_REVERTED;
419 return STG_E_INVALIDPOINTER;
421 totalBytesRead.QuadPart = 0;
422 totalBytesWritten.QuadPart = 0;
424 while ( cb.QuadPart > 0 )
426 if ( cb.QuadPart >= sizeof(tmpBuffer) )
427 copySize = sizeof(tmpBuffer);
429 copySize = cb.u.LowPart;
431 IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
433 totalBytesRead.QuadPart += bytesRead;
435 IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
437 totalBytesWritten.QuadPart += bytesWritten;
440 * Check that read & write operations were successful
442 if (bytesRead != bytesWritten)
444 hr = STG_E_MEDIUMFULL;
445 WARN("medium full\n");
449 if (bytesRead!=copySize)
452 cb.QuadPart -= bytesRead;
455 if (pcbRead) pcbRead->QuadPart = totalBytesRead.QuadPart;
456 if (pcbWritten) pcbWritten->QuadPart = totalBytesWritten.QuadPart;
462 * This method is part of the IStream interface.
464 * For streams contained in structured storages, this method
465 * does nothing. This is what the documentation tells us.
467 * See the documentation of IStream for more info.
469 static HRESULT WINAPI StgStreamImpl_Commit(
471 DWORD grfCommitFlags) /* [in] */
473 StgStreamImpl* This = impl_from_IStream(iface);
475 if (!This->parentStorage)
477 WARN("storage reverted\n");
478 return STG_E_REVERTED;
481 return StorageBaseImpl_Flush(This->parentStorage);
485 * This method is part of the IStream interface.
487 * For streams contained in structured storages, this method
488 * does nothing. This is what the documentation tells us.
490 * See the documentation of IStream for more info.
492 static HRESULT WINAPI StgStreamImpl_Revert(
498 static HRESULT WINAPI StgStreamImpl_LockRegion(
500 ULARGE_INTEGER libOffset, /* [in] */
501 ULARGE_INTEGER cb, /* [in] */
502 DWORD dwLockType) /* [in] */
504 StgStreamImpl* This = impl_from_IStream(iface);
506 if (!This->parentStorage)
508 WARN("storage reverted\n");
509 return STG_E_REVERTED;
512 FIXME("not implemented!\n");
516 static HRESULT WINAPI StgStreamImpl_UnlockRegion(
518 ULARGE_INTEGER libOffset, /* [in] */
519 ULARGE_INTEGER cb, /* [in] */
520 DWORD dwLockType) /* [in] */
522 StgStreamImpl* This = impl_from_IStream(iface);
524 if (!This->parentStorage)
526 WARN("storage reverted\n");
527 return STG_E_REVERTED;
530 FIXME("not implemented!\n");
535 * This method is part of the IStream interface.
537 * This method returns information about the current
540 * See the documentation of IStream for more info.
542 static HRESULT WINAPI StgStreamImpl_Stat(
544 STATSTG* pstatstg, /* [out] */
545 DWORD grfStatFlag) /* [in] */
547 StgStreamImpl* This = impl_from_IStream(iface);
549 DirEntry currentEntry;
552 TRACE("%p %p %d\n", This, pstatstg, grfStatFlag);
555 * if stream has no parent, return STG_E_REVERTED
558 if (!This->parentStorage)
560 WARN("storage reverted\n");
561 return STG_E_REVERTED;
565 * Read the information from the directory entry.
567 hr = StorageBaseImpl_ReadDirEntry(This->parentStorage,
573 StorageUtl_CopyDirEntryToSTATSTG(This->parentStorage,
578 pstatstg->grfMode = This->grfMode;
580 /* In simple create mode cbSize is the current pos */
581 if((This->parentStorage->openFlags & STGM_SIMPLE) && This->parentStorage->create)
582 pstatstg->cbSize = This->currentPosition;
587 WARN("failed to read entry\n");
592 * This method is part of the IStream interface.
594 * This method returns a clone of the interface that allows for
595 * another seek pointer
597 * See the documentation of IStream for more info.
599 * I am not totally sure what I am doing here but I presume that this
600 * should be basically as simple as creating a new stream with the same
601 * parent etc and positioning its seek cursor.
603 static HRESULT WINAPI StgStreamImpl_Clone(
605 IStream** ppstm) /* [out] */
607 StgStreamImpl* This = impl_from_IStream(iface);
609 StgStreamImpl* new_stream;
610 LARGE_INTEGER seek_pos;
612 TRACE("%p %p\n", This, ppstm);
618 if (!This->parentStorage)
619 return STG_E_REVERTED;
622 return STG_E_INVALIDPOINTER;
624 new_stream = StgStreamImpl_Construct (This->parentStorage, This->grfMode, This->dirEntry);
627 return STG_E_INSUFFICIENTMEMORY; /* Currently the only reason for new_stream=0 */
629 *ppstm = &new_stream->IStream_iface;
630 IStream_AddRef(*ppstm);
632 seek_pos.QuadPart = This->currentPosition.QuadPart;
634 hres = IStream_Seek(*ppstm, seek_pos, STREAM_SEEK_SET, NULL);
636 assert (SUCCEEDED(hres));
642 * Virtual function table for the StgStreamImpl class.
644 static const IStreamVtbl StgStreamVtbl =
646 StgStreamImpl_QueryInterface,
647 StgStreamImpl_AddRef,
648 StgStreamImpl_Release,
652 StgStreamImpl_SetSize,
653 StgStreamImpl_CopyTo,
654 StgStreamImpl_Commit,
655 StgStreamImpl_Revert,
656 StgStreamImpl_LockRegion,
657 StgStreamImpl_UnlockRegion,
662 /******************************************************************************
663 ** StgStreamImpl implementation
667 * This is the constructor for the StgStreamImpl class.
670 * parentStorage - Pointer to the storage that contains the stream to open
671 * dirEntry - Index of the directory entry that points to this stream.
673 StgStreamImpl* StgStreamImpl_Construct(
674 StorageBaseImpl* parentStorage,
678 StgStreamImpl* newStream;
680 newStream = HeapAlloc(GetProcessHeap(), 0, sizeof(StgStreamImpl));
685 * Set-up the virtual function table and reference count.
687 newStream->IStream_iface.lpVtbl = &StgStreamVtbl;
690 newStream->parentStorage = parentStorage;
693 * We want to nail-down the reference to the storage in case the
694 * stream out-lives the storage in the client application.
696 * -- IStorage_AddRef(&newStream->parentStorage->IStorage_iface);
698 * No, don't do this. Some apps call IStorage_Release without
699 * calling IStream_Release first. If we grab a reference the
700 * file is not closed, and the app fails when it tries to
701 * reopen the file (Easy-PC, for example)
704 newStream->grfMode = grfMode;
705 newStream->dirEntry = dirEntry;
708 * Start the stream at the beginning.
710 newStream->currentPosition.u.HighPart = 0;
711 newStream->currentPosition.u.LowPart = 0;
713 /* add us to the storage's list of active streams */
714 StorageBaseImpl_AddStream(parentStorage, newStream);