2 * HGLOBAL Stream implementation
4 * This file contains the implementation of the stream interface
5 * for streams contained supported by an HGLOBAL pointer.
7 * Copyright 1999 Francis Beaudet
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.
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.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
33 #define NONAMELESSUNION
34 #define NONAMELESSSTRUCT
44 #include "wine/debug.h"
46 WINE_DEFAULT_DEBUG_CHANNEL(storage);
48 /****************************************************************************
49 * HGLOBALStreamImpl definition.
51 * This class implements the IStream interface and represents a stream
52 * supported by an HGLOBAL pointer.
56 IStream IStream_iface;
59 /* support for the stream */
60 HGLOBAL supportHandle;
62 /* if TRUE the HGLOBAL is destroyed when the stream is finally released */
65 /* size of the stream */
66 ULARGE_INTEGER streamSize;
68 /* current position of the cursor */
69 ULARGE_INTEGER currentPosition;
72 static inline HGLOBALStreamImpl *impl_from_IStream(IStream *iface)
74 return CONTAINING_RECORD(iface, HGLOBALStreamImpl, IStream_iface);
77 static HRESULT WINAPI HGLOBALStreamImpl_QueryInterface(
79 REFIID riid, /* [in] */
80 void** ppvObject) /* [iid_is][out] */
82 HGLOBALStreamImpl* This = impl_from_IStream(iface);
89 if (IsEqualIID(&IID_IUnknown, riid) ||
90 IsEqualIID(&IID_ISequentialStream, riid) ||
91 IsEqualIID(&IID_IStream, riid))
99 IStream_AddRef(iface);
104 static ULONG WINAPI HGLOBALStreamImpl_AddRef(IStream* iface)
106 HGLOBALStreamImpl* This = impl_from_IStream(iface);
107 return InterlockedIncrement(&This->ref);
110 static ULONG WINAPI HGLOBALStreamImpl_Release(
113 HGLOBALStreamImpl* This= impl_from_IStream(iface);
114 ULONG ref = InterlockedDecrement(&This->ref);
118 if (This->deleteOnRelease)
120 GlobalFree(This->supportHandle);
121 This->supportHandle = NULL;
124 HeapFree(GetProcessHeap(), 0, This);
131 * This method is part of the ISequentialStream interface.
133 * If reads a block of information from the stream at the current
134 * position. It then moves the current position at the end of the
137 * See the documentation of ISequentialStream for more info.
139 static HRESULT WINAPI HGLOBALStreamImpl_Read(
141 void* pv, /* [length_is][size_is][out] */
143 ULONG* pcbRead) /* [out] */
145 HGLOBALStreamImpl* This = impl_from_IStream(iface);
148 ULONG bytesReadBuffer;
149 ULONG bytesToReadFromBuffer;
151 TRACE("(%p, %p, %d, %p)\n", iface,
155 * If the caller is not interested in the number of bytes read,
156 * we use another buffer to avoid "if" statements in the code.
159 pcbRead = &bytesReadBuffer;
162 * Using the known size of the stream, calculate the number of bytes
163 * to read from the block chain
165 bytesToReadFromBuffer = min( This->streamSize.u.LowPart - This->currentPosition.u.LowPart, cb);
168 * Lock the buffer in position and copy the data.
170 supportBuffer = GlobalLock(This->supportHandle);
173 WARN("read from invalid hglobal %p\n", This->supportHandle);
178 memcpy(pv, (char *) supportBuffer+This->currentPosition.u.LowPart, bytesToReadFromBuffer);
181 * Move the current position to the new position
183 This->currentPosition.u.LowPart+=bytesToReadFromBuffer;
186 * Return the number of bytes read.
188 *pcbRead = bytesToReadFromBuffer;
193 GlobalUnlock(This->supportHandle);
196 * Always returns S_OK even if the end of the stream is reached before the
204 * This method is part of the ISequentialStream interface.
206 * It writes a block of information to the stream at the current
207 * position. It then moves the current position at the end of the
208 * written block. If the stream is too small to fit the block,
209 * the stream is grown to fit.
211 * See the documentation of ISequentialStream for more info.
213 static HRESULT WINAPI HGLOBALStreamImpl_Write(
215 const void* pv, /* [size_is][in] */
217 ULONG* pcbWritten) /* [out] */
219 HGLOBALStreamImpl* This = impl_from_IStream(iface);
222 ULARGE_INTEGER newSize;
223 ULONG bytesWritten = 0;
225 TRACE("(%p, %p, %d, %p)\n", iface, pv, cb, pcbWritten);
228 * If the caller is not interested in the number of bytes written,
229 * we use another buffer to avoid "if" statements in the code.
232 pcbWritten = &bytesWritten;
239 newSize.u.HighPart = 0;
240 newSize.u.LowPart = This->currentPosition.u.LowPart + cb;
243 * Verify if we need to grow the stream
245 if (newSize.u.LowPart > This->streamSize.u.LowPart)
248 HRESULT hr = IStream_SetSize(iface, newSize);
251 ERR("IStream_SetSize failed with error 0x%08x\n", hr);
257 * Lock the buffer in position and copy the data.
259 supportBuffer = GlobalLock(This->supportHandle);
262 WARN("write to invalid hglobal %p\n", This->supportHandle);
266 memcpy((char *) supportBuffer+This->currentPosition.u.LowPart, pv, cb);
269 * Move the current position to the new position
271 This->currentPosition.u.LowPart+=cb;
276 GlobalUnlock(This->supportHandle);
280 * Return the number of bytes read.
288 * This method is part of the IStream interface.
290 * It will move the current stream pointer according to the parameters
293 * See the documentation of IStream for more info.
295 static HRESULT WINAPI HGLOBALStreamImpl_Seek(
297 LARGE_INTEGER dlibMove, /* [in] */
298 DWORD dwOrigin, /* [in] */
299 ULARGE_INTEGER* plibNewPosition) /* [out] */
301 HGLOBALStreamImpl* This = impl_from_IStream(iface);
303 ULARGE_INTEGER newPosition = This->currentPosition;
306 TRACE("(%p, %x%08x, %d, %p)\n", iface, dlibMove.u.HighPart,
307 dlibMove.u.LowPart, dwOrigin, plibNewPosition);
310 * The file pointer is moved depending on the given "function"
315 case STREAM_SEEK_SET:
316 newPosition.u.HighPart = 0;
317 newPosition.u.LowPart = 0;
319 case STREAM_SEEK_CUR:
321 case STREAM_SEEK_END:
322 newPosition = This->streamSize;
325 hr = STG_E_SEEKERROR;
330 * Move the actual file pointer
331 * If the file pointer ends-up after the end of the stream, the next Write operation will
332 * make the file larger. This is how it is documented.
334 newPosition.u.HighPart = 0;
335 newPosition.u.LowPart += dlibMove.QuadPart;
337 if (dlibMove.u.LowPart >= 0x80000000 &&
338 newPosition.u.LowPart >= dlibMove.u.LowPart)
340 /* We tried to seek backwards and went past the start. */
341 hr = STG_E_SEEKERROR;
345 This->currentPosition = newPosition;
348 if (plibNewPosition) *plibNewPosition = This->currentPosition;
354 * This method is part of the IStream interface.
356 * It will change the size of a stream.
358 * TODO: Switch from small blocks to big blocks and vice versa.
360 * See the documentation of IStream for more info.
362 static HRESULT WINAPI HGLOBALStreamImpl_SetSize(
364 ULARGE_INTEGER libNewSize) /* [in] */
366 HGLOBALStreamImpl* This = impl_from_IStream(iface);
367 HGLOBAL supportHandle;
369 TRACE("(%p, %d)\n", iface, libNewSize.u.LowPart);
372 * HighPart is ignored as shown in tests
375 if (This->streamSize.u.LowPart == libNewSize.u.LowPart)
379 * Re allocate the HGlobal to fit the new size of the stream.
381 supportHandle = GlobalReAlloc(This->supportHandle, libNewSize.u.LowPart, 0);
383 if (supportHandle == 0)
384 return E_OUTOFMEMORY;
386 This->supportHandle = supportHandle;
387 This->streamSize.u.LowPart = libNewSize.u.LowPart;
393 * This method is part of the IStream interface.
395 * It will copy the 'cb' Bytes to 'pstm' IStream.
397 * See the documentation of IStream for more info.
399 static HRESULT WINAPI HGLOBALStreamImpl_CopyTo(
401 IStream* pstm, /* [unique][in] */
402 ULARGE_INTEGER cb, /* [in] */
403 ULARGE_INTEGER* pcbRead, /* [out] */
404 ULARGE_INTEGER* pcbWritten) /* [out] */
408 ULONG bytesRead, bytesWritten, copySize;
409 ULARGE_INTEGER totalBytesRead;
410 ULARGE_INTEGER totalBytesWritten;
412 TRACE("(%p, %p, %d, %p, %p)\n", iface, pstm,
413 cb.u.LowPart, pcbRead, pcbWritten);
416 return STG_E_INVALIDPOINTER;
418 totalBytesRead.QuadPart = 0;
419 totalBytesWritten.QuadPart = 0;
421 while ( cb.QuadPart > 0 )
423 if ( cb.QuadPart >= sizeof(tmpBuffer) )
424 copySize = sizeof(tmpBuffer);
426 copySize = cb.u.LowPart;
428 hr = IStream_Read(iface, tmpBuffer, copySize, &bytesRead);
432 totalBytesRead.QuadPart += bytesRead;
436 hr = IStream_Write(pstm, tmpBuffer, bytesRead, &bytesWritten);
440 totalBytesWritten.QuadPart += bytesWritten;
443 if (bytesRead!=copySize)
446 cb.QuadPart -= bytesRead;
449 if (pcbRead) pcbRead->QuadPart = totalBytesRead.QuadPart;
450 if (pcbWritten) pcbWritten->QuadPart = totalBytesWritten.QuadPart;
456 * This method is part of the IStream interface.
458 * For streams supported by HGLOBALS, this function does nothing.
459 * This is what the documentation tells us.
461 * See the documentation of IStream for more info.
463 static HRESULT WINAPI HGLOBALStreamImpl_Commit(
465 DWORD grfCommitFlags) /* [in] */
471 * This method is part of the IStream interface.
473 * For streams supported by HGLOBALS, this function does nothing.
474 * This is what the documentation tells us.
476 * See the documentation of IStream for more info.
478 static HRESULT WINAPI HGLOBALStreamImpl_Revert(
485 * This method is part of the IStream interface.
487 * For streams supported by HGLOBALS, this function does nothing.
488 * This is what the documentation tells us.
490 * See the documentation of IStream for more info.
492 static HRESULT WINAPI HGLOBALStreamImpl_LockRegion(
494 ULARGE_INTEGER libOffset, /* [in] */
495 ULARGE_INTEGER cb, /* [in] */
496 DWORD dwLockType) /* [in] */
498 return STG_E_INVALIDFUNCTION;
502 * This method is part of the IStream interface.
504 * For streams supported by HGLOBALS, this function does nothing.
505 * This is what the documentation tells us.
507 * See the documentation of IStream for more info.
509 static HRESULT WINAPI HGLOBALStreamImpl_UnlockRegion(
511 ULARGE_INTEGER libOffset, /* [in] */
512 ULARGE_INTEGER cb, /* [in] */
513 DWORD dwLockType) /* [in] */
519 * This method is part of the IStream interface.
521 * This method returns information about the current
524 * See the documentation of IStream for more info.
526 static HRESULT WINAPI HGLOBALStreamImpl_Stat(
528 STATSTG* pstatstg, /* [out] */
529 DWORD grfStatFlag) /* [in] */
531 HGLOBALStreamImpl* This = impl_from_IStream(iface);
533 memset(pstatstg, 0, sizeof(STATSTG));
535 pstatstg->pwcsName = NULL;
536 pstatstg->type = STGTY_STREAM;
537 pstatstg->cbSize = This->streamSize;
542 static HRESULT WINAPI HGLOBALStreamImpl_Clone(
544 IStream** ppstm) /* [out] */
546 HGLOBALStreamImpl* This = impl_from_IStream(iface);
547 ULARGE_INTEGER dummy;
548 LARGE_INTEGER offset;
551 TRACE(" Cloning %p (deleteOnRelease=%d seek position=%ld)\n",iface,This->deleteOnRelease,(long)This->currentPosition.QuadPart);
552 hr = CreateStreamOnHGlobal(This->supportHandle, FALSE, ppstm);
555 offset.QuadPart = (LONGLONG)This->currentPosition.QuadPart;
556 IStream_Seek(*ppstm, offset, STREAM_SEEK_SET, &dummy);
560 static const IStreamVtbl HGLOBALStreamImplVtbl =
562 HGLOBALStreamImpl_QueryInterface,
563 HGLOBALStreamImpl_AddRef,
564 HGLOBALStreamImpl_Release,
565 HGLOBALStreamImpl_Read,
566 HGLOBALStreamImpl_Write,
567 HGLOBALStreamImpl_Seek,
568 HGLOBALStreamImpl_SetSize,
569 HGLOBALStreamImpl_CopyTo,
570 HGLOBALStreamImpl_Commit,
571 HGLOBALStreamImpl_Revert,
572 HGLOBALStreamImpl_LockRegion,
573 HGLOBALStreamImpl_UnlockRegion,
574 HGLOBALStreamImpl_Stat,
575 HGLOBALStreamImpl_Clone
578 /***********************************************************************
579 * CreateStreamOnHGlobal [OLE32.@]
581 HRESULT WINAPI CreateStreamOnHGlobal(
583 BOOL fDeleteOnRelease,
586 HGLOBALStreamImpl* This;
591 This = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALStreamImpl));
592 if (!This) return E_OUTOFMEMORY;
594 This->IStream_iface.lpVtbl = &HGLOBALStreamImplVtbl;
597 /* initialize the support */
598 This->supportHandle = hGlobal;
599 This->deleteOnRelease = fDeleteOnRelease;
601 /* allocate a handle if one is not supplied */
602 if (!This->supportHandle)
603 This->supportHandle = GlobalAlloc(GMEM_MOVEABLE|GMEM_NODISCARD|GMEM_SHARE, 0);
605 /* start at the beginning */
606 This->currentPosition.u.HighPart = 0;
607 This->currentPosition.u.LowPart = 0;
609 /* initialize the size of the stream to the size of the handle */
610 This->streamSize.u.HighPart = 0;
611 This->streamSize.u.LowPart = GlobalSize(This->supportHandle);
613 *ppstm = &This->IStream_iface;
618 /***********************************************************************
619 * GetHGlobalFromStream [OLE32.@]
621 HRESULT WINAPI GetHGlobalFromStream(IStream* pstm, HGLOBAL* phglobal)
623 HGLOBALStreamImpl* pStream;
628 pStream = (HGLOBALStreamImpl*) pstm;
631 * Verify that the stream object was created with CreateStreamOnHGlobal.
633 if (pStream->IStream_iface.lpVtbl == &HGLOBALStreamImplVtbl)
634 *phglobal = pStream->supportHandle;