1 /******************************************************************************
3 * Global memory implementation of ILockBytes.
5 * Copyright 1999 Thuy Nguyen
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #define NONAMELESSUNION
30 #define NONAMELESSSTRUCT
39 #include "wine/debug.h"
41 WINE_DEFAULT_DEBUG_CHANNEL(ole);
43 /******************************************************************************
44 * HGLOBALLockBytesImpl definition.
46 * This class imlements the ILockBytes inteface and represents a byte array
47 * object supported by an HGLOBAL pointer.
49 struct HGLOBALLockBytesImpl
52 * Needs to be the first item in the struct
53 * since we want to cast this in an ILockBytes pointer
55 ILockBytesVtbl *lpVtbl;
63 * Support for the LockBytes object
65 HGLOBAL supportHandle;
68 * This flag is TRUE if the HGLOBAL is destroyed when the object
69 * is finally released.
74 * Helper variable that contains the size of the byte array
76 ULARGE_INTEGER byteArraySize;
79 typedef struct HGLOBALLockBytesImpl HGLOBALLockBytesImpl;
82 * Method definition for the HGLOBALLockBytesImpl class.
84 HGLOBALLockBytesImpl* HGLOBALLockBytesImpl_Construct(
86 BOOL fDeleteOnRelease);
88 void HGLOBALLockBytesImpl_Destroy(HGLOBALLockBytesImpl* This);
90 HRESULT WINAPI HGLOBALLockBytesImpl_QueryInterface(
92 REFIID riid, /* [in] */
93 void** ppvObject); /* [iid_is][out] */
95 ULONG WINAPI HGLOBALLockBytesImpl_AddRef(
98 ULONG WINAPI HGLOBALLockBytesImpl_Release(
101 HRESULT WINAPI HGLOBALLockBytesImpl_ReadAt(
103 ULARGE_INTEGER ulOffset, /* [in] */
104 void* pv, /* [length_is][size_is][out] */
106 ULONG* pcbRead); /* [out] */
108 HRESULT WINAPI HGLOBALLockBytesImpl_WriteAt(
110 ULARGE_INTEGER ulOffset, /* [in] */
111 const void* pv, /* [size_is][in] */
113 ULONG* pcbWritten); /* [out] */
115 HRESULT WINAPI HGLOBALLockBytesImpl_Flush(
118 HRESULT WINAPI HGLOBALLockBytesImpl_SetSize(
120 ULARGE_INTEGER libNewSize); /* [in] */
122 HRESULT WINAPI HGLOBALLockBytesImpl_LockRegion(
124 ULARGE_INTEGER libOffset, /* [in] */
125 ULARGE_INTEGER cb, /* [in] */
126 DWORD dwLockType); /* [in] */
128 HRESULT WINAPI HGLOBALLockBytesImpl_UnlockRegion(
130 ULARGE_INTEGER libOffset, /* [in] */
131 ULARGE_INTEGER cb, /* [in] */
132 DWORD dwLockType); /* [in] */
134 HRESULT WINAPI HGLOBALLockBytesImpl_Stat(
136 STATSTG* pstatstg, /* [out] */
137 DWORD grfStatFlag); /* [in] */
140 * Virtual function table for the HGLOBALLockBytesImpl class.
142 static ILockBytesVtbl HGLOBALLockBytesImpl_Vtbl =
144 HGLOBALLockBytesImpl_QueryInterface,
145 HGLOBALLockBytesImpl_AddRef,
146 HGLOBALLockBytesImpl_Release,
147 HGLOBALLockBytesImpl_ReadAt,
148 HGLOBALLockBytesImpl_WriteAt,
149 HGLOBALLockBytesImpl_Flush,
150 HGLOBALLockBytesImpl_SetSize,
151 HGLOBALLockBytesImpl_LockRegion,
152 HGLOBALLockBytesImpl_UnlockRegion,
153 HGLOBALLockBytesImpl_Stat,
156 /******************************************************************************
157 * CreateILockBytesOnHGlobal [OLE32.@]
159 HRESULT WINAPI CreateILockBytesOnHGlobal(HGLOBAL hGlobal,
160 BOOL fDeleteOnRelease,
161 LPLOCKBYTES* ppLkbyt)
163 HGLOBALLockBytesImpl* newLockBytes;
165 newLockBytes = HGLOBALLockBytesImpl_Construct(hGlobal, fDeleteOnRelease);
167 if (newLockBytes != NULL)
169 return IUnknown_QueryInterface((IUnknown*)newLockBytes,
174 return E_OUTOFMEMORY;
177 /******************************************************************************
178 * GetHGlobalFromILockBytes [OLE32.@]
180 HRESULT WINAPI GetHGlobalFromILockBytes(ILockBytes* plkbyt, HGLOBAL* phglobal)
182 HGLOBALLockBytesImpl* const pMemLockBytes = (HGLOBALLockBytesImpl*)plkbyt;
185 ULARGE_INTEGER start;
189 if (pMemLockBytes->lpVtbl == &HGLOBALLockBytesImpl_Vtbl) {
190 *phglobal = pMemLockBytes->supportHandle;
195 /* It is not our lockbytes implementation, so use a more generic way */
196 hres = ILockBytes_Stat(plkbyt,&stbuf,0);
198 ERR("Cannot ILockBytes_Stat, %lx\n",hres);
201 FIXME("cbSize is %ld\n",stbuf.cbSize.u.LowPart);
202 *phglobal = GlobalAlloc( GMEM_MOVEABLE|GMEM_SHARE, stbuf.cbSize.u.LowPart);
205 memset(&start,0,sizeof(start));
206 hres = ILockBytes_ReadAt(plkbyt, start, GlobalLock(*phglobal), stbuf.cbSize.u.LowPart, &xread);
207 GlobalUnlock(*phglobal);
209 FIXME("%p->ReadAt failed with %lx\n",plkbyt,hres);
212 if (stbuf.cbSize.u.LowPart != xread) {
213 FIXME("Read size is not requested size %ld vs %ld?\n",stbuf.cbSize.u.LowPart, xread);
218 /******************************************************************************
220 * HGLOBALLockBytesImpl implementation
224 /******************************************************************************
225 * This is the constructor for the HGLOBALLockBytesImpl class.
228 * hGlobal - Handle that will support the stream. can be NULL.
229 * fDeleteOnRelease - Flag set to TRUE if the HGLOBAL will be released
230 * when the IStream object is destroyed.
232 HGLOBALLockBytesImpl* HGLOBALLockBytesImpl_Construct(HGLOBAL hGlobal,
233 BOOL fDeleteOnRelease)
235 HGLOBALLockBytesImpl* newLockBytes;
236 newLockBytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl));
241 * Set up the virtual function table and reference count.
243 newLockBytes->lpVtbl = &HGLOBALLockBytesImpl_Vtbl;
244 newLockBytes->ref = 0;
247 * Initialize the support.
249 newLockBytes->supportHandle = hGlobal;
250 newLockBytes->deleteOnRelease = fDeleteOnRelease;
253 * This method will allocate a handle if one is not supplied.
255 if (newLockBytes->supportHandle == 0)
257 newLockBytes->supportHandle = GlobalAlloc(GMEM_MOVEABLE |
263 * Initialize the size of the array to the size of the handle.
265 newLockBytes->byteArraySize.u.HighPart = 0;
266 newLockBytes->byteArraySize.u.LowPart = GlobalSize(
267 newLockBytes->supportHandle);
273 /******************************************************************************
274 * This is the destructor of the HGLOBALStreamImpl class.
276 * This method will clean-up all the resources used-up by the given
277 * HGLOBALLockBytesImpl class. The pointer passed-in to this function will be
278 * freed and will not be valid anymore.
280 void HGLOBALLockBytesImpl_Destroy(HGLOBALLockBytesImpl* This)
283 * Release the HGlobal if the constructor asked for that.
285 if (This->deleteOnRelease)
287 GlobalFree(This->supportHandle);
288 This->supportHandle = 0;
292 * Finally, free the memory used-up by the class.
294 HeapFree(GetProcessHeap(), 0, This);
297 /******************************************************************************
298 * This implements the IUnknown method QueryInterface for this
301 HRESULT WINAPI HGLOBALLockBytesImpl_QueryInterface(
303 REFIID riid, /* [in] */
304 void** ppvObject) /* [iid_is][out] */
306 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
309 * Perform a sanity check on the parameters.
315 * Initialize the return parameter.
320 * Compare the riid with the interface IDs implemented by this object.
322 if (memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) == 0)
324 *ppvObject = (ILockBytes*)This;
326 else if (memcmp(&IID_ILockBytes, riid, sizeof(IID_ILockBytes)) == 0)
328 *ppvObject = (ILockBytes*)This;
332 * Check that we obtained an interface.
335 return E_NOINTERFACE;
338 * Query Interface always increases the reference count by one when it is
341 HGLOBALLockBytesImpl_AddRef(iface);
346 /******************************************************************************
347 * This implements the IUnknown method AddRef for this
350 ULONG WINAPI HGLOBALLockBytesImpl_AddRef(ILockBytes* iface)
352 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
353 return InterlockedIncrement(&This->ref);
356 /******************************************************************************
357 * This implements the IUnknown method Release for this
360 ULONG WINAPI HGLOBALLockBytesImpl_Release(ILockBytes* iface)
362 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
365 ref = InterlockedDecrement(&This->ref);
368 * If the reference count goes down to 0, perform suicide.
372 HGLOBALLockBytesImpl_Destroy(This);
378 /******************************************************************************
379 * This method is part of the ILockBytes interface.
381 * It reads a block of information from the byte array at the specified
384 * See the documentation of ILockBytes for more info.
386 HRESULT WINAPI HGLOBALLockBytesImpl_ReadAt(
388 ULARGE_INTEGER ulOffset, /* [in] */
389 void* pv, /* [length_is][size_is][out] */
391 ULONG* pcbRead) /* [out] */
393 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
396 ULONG bytesReadBuffer = 0;
397 ULONG bytesToReadFromBuffer;
400 * If the caller is not interested in the number of bytes read,
401 * we use another buffer to avoid "if" statements in the code.
404 pcbRead = &bytesReadBuffer;
407 * Make sure the offset is valid.
409 if (ulOffset.u.LowPart > This->byteArraySize.u.LowPart)
413 * Using the known size of the array, calculate the number of bytes
416 bytesToReadFromBuffer = min(This->byteArraySize.u.LowPart -
417 ulOffset.u.LowPart, cb);
420 * Lock the buffer in position and copy the data.
422 supportBuffer = GlobalLock(This->supportHandle);
425 (char *) supportBuffer + ulOffset.u.LowPart,
426 bytesToReadFromBuffer);
429 * Return the number of bytes read.
431 *pcbRead = bytesToReadFromBuffer;
436 GlobalUnlock(This->supportHandle);
439 * The function returns S_OK if the specified number of bytes were read
440 * or the end of the array was reached.
441 * It returns STG_E_READFAULT if the number of bytes to read does not equal
442 * the number of bytes actually read.
447 return STG_E_READFAULT;
450 /******************************************************************************
451 * This method is part of the ILockBytes interface.
453 * It writes the specified bytes at the specified offset.
454 * position. If the array is too small, it will be resized.
456 * See the documentation of ILockBytes for more info.
458 HRESULT WINAPI HGLOBALLockBytesImpl_WriteAt(
460 ULARGE_INTEGER ulOffset, /* [in] */
461 const void* pv, /* [size_is][in] */
463 ULONG* pcbWritten) /* [out] */
465 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
468 ULARGE_INTEGER newSize;
469 ULONG bytesWritten = 0;
472 * If the caller is not interested in the number of bytes written,
473 * we use another buffer to avoid "if" statements in the code.
476 pcbWritten = &bytesWritten;
484 newSize.u.HighPart = 0;
485 newSize.u.LowPart = ulOffset.u.LowPart + cb;
489 * Verify if we need to grow the stream
491 if (newSize.u.LowPart > This->byteArraySize.u.LowPart)
494 if (HGLOBALLockBytesImpl_SetSize(iface, newSize) == STG_E_MEDIUMFULL)
495 return STG_E_MEDIUMFULL;
499 * Lock the buffer in position and copy the data.
501 supportBuffer = GlobalLock(This->supportHandle);
503 memcpy((char *) supportBuffer + ulOffset.u.LowPart, pv, cb);
506 * Return the number of bytes written.
513 GlobalUnlock(This->supportHandle);
518 /******************************************************************************
519 * This method is part of the ILockBytes interface.
521 * See the documentation of ILockBytes for more info.
523 HRESULT WINAPI HGLOBALLockBytesImpl_Flush(ILockBytes* iface)
528 /******************************************************************************
529 * This method is part of the ILockBytes interface.
531 * It will change the size of the byte array.
533 * See the documentation of ILockBytes for more info.
535 HRESULT WINAPI HGLOBALLockBytesImpl_SetSize(
537 ULARGE_INTEGER libNewSize) /* [in] */
539 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
540 HGLOBAL supportHandle;
545 if (libNewSize.u.HighPart != 0)
546 return STG_E_INVALIDFUNCTION;
548 if (This->byteArraySize.u.LowPart == libNewSize.u.LowPart)
552 * Re allocate the HGlobal to fit the new size of the stream.
554 supportHandle = GlobalReAlloc(This->supportHandle, libNewSize.u.LowPart, 0);
556 if (supportHandle == 0)
557 return STG_E_MEDIUMFULL;
559 This->supportHandle = supportHandle;
560 This->byteArraySize.u.LowPart = libNewSize.u.LowPart;
565 /******************************************************************************
566 * This method is part of the ILockBytes interface.
568 * The global memory implementation of ILockBytes does not support locking.
570 * See the documentation of ILockBytes for more info.
572 HRESULT WINAPI HGLOBALLockBytesImpl_LockRegion(
574 ULARGE_INTEGER libOffset, /* [in] */
575 ULARGE_INTEGER cb, /* [in] */
576 DWORD dwLockType) /* [in] */
578 return STG_E_INVALIDFUNCTION;
581 /******************************************************************************
582 * This method is part of the ILockBytes interface.
584 * The global memory implementation of ILockBytes does not support locking.
586 * See the documentation of ILockBytes for more info.
588 HRESULT WINAPI HGLOBALLockBytesImpl_UnlockRegion(
590 ULARGE_INTEGER libOffset, /* [in] */
591 ULARGE_INTEGER cb, /* [in] */
592 DWORD dwLockType) /* [in] */
594 return STG_E_INVALIDFUNCTION;
597 /******************************************************************************
598 * This method is part of the ILockBytes interface.
600 * This method returns information about the current
603 * See the documentation of ILockBytes for more info.
605 HRESULT WINAPI HGLOBALLockBytesImpl_Stat(
607 STATSTG* pstatstg, /* [out] */
608 DWORD grfStatFlag) /* [in] */
610 HGLOBALLockBytesImpl* const This=(HGLOBALLockBytesImpl*)iface;
612 memset(pstatstg, 0, sizeof(STATSTG));
614 pstatstg->pwcsName = NULL;
615 pstatstg->type = STGTY_LOCKBYTES;
616 pstatstg->cbSize = This->byteArraySize;