2 * Global memory implementation of ILockBytes.
4 * Copyright 1999 Thuy Nguyen
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #define NONAMELESSUNION
28 #define NONAMELESSSTRUCT
31 #include "wine/winbase16.h"
39 #include "wine/debug.h"
41 WINE_DEFAULT_DEBUG_CHANNEL(ole
);
43 /******************************************************************************
44 * HGLOBALLockBytesImpl16 definition.
46 * This class imlements the ILockBytes inteface and represents a byte array
47 * object supported by an HGLOBAL pointer.
49 struct HGLOBALLockBytesImpl16
52 * Needs to be the first item in the stuct
53 * since we want to cast this in an ILockBytes pointer
55 ILockBytes16Vtbl
*lpVtbl
;
59 * Support for the LockBytes object
61 HGLOBAL16 supportHandle
;
64 * This flag is TRUE if the HGLOBAL is destroyed when the object
65 * is finally released.
69 * Helper variable that contains the size of the byte array
71 ULARGE_INTEGER byteArraySize
;
74 typedef struct HGLOBALLockBytesImpl16 HGLOBALLockBytesImpl16
;
76 HGLOBALLockBytesImpl16
* HGLOBALLockBytesImpl16_Construct(
78 BOOL16 fDeleteOnRelease
);
80 void HGLOBALLockBytesImpl16_Destroy(HGLOBALLockBytesImpl16
* This
);
82 HRESULT WINAPI
HGLOBALLockBytesImpl16_QueryInterface(
84 REFIID riid
, /* [in] */
85 void** ppvObject
); /* [out][iid_is] */
87 ULONG WINAPI
HGLOBALLockBytesImpl16_AddRef(
90 ULONG WINAPI
HGLOBALLockBytesImpl16_Release(
93 HRESULT WINAPI
HGLOBALLockBytesImpl16_ReadAt(
95 ULARGE_INTEGER ulOffset
, /* [in] */
96 void* pv
, /* [out][length_is][size_is] */
98 ULONG
* pcbRead
); /* [out] */
100 HRESULT WINAPI
HGLOBALLockBytesImpl16_WriteAt(
102 ULARGE_INTEGER ulOffset
, /* [in] */
103 const void* pv
, /* [in][size_is] */
105 ULONG
* pcbWritten
); /* [out] */
107 HRESULT WINAPI
HGLOBALLockBytesImpl16_Flush(
108 ILockBytes16
* iface
);
110 HRESULT WINAPI
HGLOBALLockBytesImpl16_SetSize(
112 ULARGE_INTEGER libNewSize
); /* [in] */
114 HRESULT WINAPI
HGLOBALLockBytesImpl16_LockRegion(
116 ULARGE_INTEGER libOffset
, /* [in] */
117 ULARGE_INTEGER cb
, /* [in] */
118 DWORD dwLockType
); /* [in] */
120 HRESULT WINAPI
HGLOBALLockBytesImpl16_UnlockRegion(
122 ULARGE_INTEGER libOffset
, /* [in] */
123 ULARGE_INTEGER cb
, /* [in] */
124 DWORD dwLockType
); /* [in] */
126 HRESULT WINAPI
HGLOBALLockBytesImpl16_Stat(
128 STATSTG16
* pstatstg
, /* [out] */
129 DWORD grfStatFlag
); /* [in] */
131 /******************************************************************************
133 * HGLOBALLockBytesImpl16 implementation
137 /******************************************************************************
138 * This is the constructor for the HGLOBALLockBytesImpl16 class.
141 * hGlobal - Handle that will support the stream. can be NULL.
142 * fDeleteOnRelease - Flag set to TRUE if the HGLOBAL16 will be released
143 * when the IStream object is destroyed.
145 HGLOBALLockBytesImpl16
*
146 HGLOBALLockBytesImpl16_Construct(HGLOBAL16 hGlobal
,
147 BOOL16 fDeleteOnRelease
)
149 HGLOBALLockBytesImpl16
* newLockBytes
;
151 static ILockBytes16Vtbl vt16
;
152 static SEGPTR msegvt16
;
153 HMODULE16 hcomp
= GetModuleHandle16("OLE2");
156 TRACE("(%x,%d)\n",hGlobal
,fDeleteOnRelease
);
157 newLockBytes
= HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl16
));
158 if (newLockBytes
== NULL
)
162 * Set up the virtual function table and reference count.
166 #define VTENT(x) vt16.x = (void*)GetProcAddress16(hcomp,"HGLOBALLockBytesImpl16_"#x);assert(vt16.x)
167 VTENT(QueryInterface
);
177 msegvt16
= MapLS( &vt16
);
179 newLockBytes
->lpVtbl
= (ILockBytes16Vtbl
*)msegvt16
;
180 newLockBytes
->ref
= 0;
182 * Initialize the support.
184 newLockBytes
->supportHandle
= hGlobal
;
185 newLockBytes
->deleteOnRelease
= fDeleteOnRelease
;
188 * This method will allocate a handle if one is not supplied.
190 if (newLockBytes
->supportHandle
== 0)
191 newLockBytes
->supportHandle
= GlobalAlloc16(GMEM_MOVEABLE
| GMEM_NODISCARD
, 0);
194 * Initialize the size of the array to the size of the handle.
196 newLockBytes
->byteArraySize
.u
.HighPart
= 0;
197 newLockBytes
->byteArraySize
.u
.LowPart
= GlobalSize16(
198 newLockBytes
->supportHandle
);
200 return (HGLOBALLockBytesImpl16
*)MapLS(newLockBytes
);
203 /******************************************************************************
204 * This is the destructor of the HGLOBALStreamImpl class.
206 * This method will clean-up all the resources used-up by the given
207 * HGLOBALLockBytesImpl16 class. The pointer passed-in to this function will be
208 * freed and will not be valid anymore.
210 void HGLOBALLockBytesImpl16_Destroy(HGLOBALLockBytesImpl16
* This
)
214 * Release the HGlobal if the constructor asked for that.
216 if (This
->deleteOnRelease
)
218 GlobalFree16(This
->supportHandle
);
219 This
->supportHandle
= 0;
223 * Finally, free the memory used-up by the class.
225 HeapFree(GetProcessHeap(), 0, This
);
228 /******************************************************************************
229 * This implements the IUnknown method QueryInterface for this
232 HRESULT WINAPI
HGLOBALLockBytesImpl16_QueryInterface(
233 ILockBytes16
* iface
, /* [in] SEGPTR */
234 REFIID riid
, /* [in] */
235 void** ppvObject
) /* [out][iid_is] (ptr to SEGPTR!) */
237 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)MapSL((SEGPTR
)iface
);
239 TRACE("(%p,%s,%p)\n",iface
,debugstr_guid(riid
),ppvObject
);
241 * Perform a sanity check on the parameters.
247 * Initialize the return parameter.
251 * Compare the riid with the interface IDs implemented by this object.
253 if ( !memcmp(&IID_IUnknown
, riid
, sizeof(IID_IUnknown
)) ||
254 !memcmp(&IID_ILockBytes
, riid
, sizeof(IID_ILockBytes
))
256 *ppvObject
= (void*)iface
;
259 * Check that we obtained an interface.
262 return E_NOINTERFACE
;
265 * Query Interface always increases the reference count by one when it is
268 HGLOBALLockBytesImpl16_AddRef((ILockBytes16
*)This
);
273 /******************************************************************************
274 * This implements the IUnknown method AddRef for this
277 ULONG WINAPI
HGLOBALLockBytesImpl16_AddRef(ILockBytes16
* iface
)
279 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)iface
;
281 TRACE("(%p)\n",This
);
288 /******************************************************************************
289 * This implements the IUnknown method Release for this
292 ULONG WINAPI
HGLOBALLockBytesImpl16_Release(ILockBytes16
* iface
)
294 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)iface
;
297 TRACE("(%p)\n",This
);
304 * If the reference count goes down to 0, perform suicide.
307 HGLOBALLockBytesImpl16_Destroy(This
);
311 /******************************************************************************
312 * This method is part of the ILockBytes interface.
314 * It reads a block of information from the byte array at the specified
317 * See the documentation of ILockBytes for more info.
319 HRESULT WINAPI
HGLOBALLockBytesImpl16_ReadAt(
321 ULARGE_INTEGER ulOffset
, /* [in] */
322 void* pv
, /* [out][length_is][size_is] */
324 ULONG
* pcbRead
) /* [out] */
326 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)iface
;
329 ULONG bytesReadBuffer
= 0;
330 ULONG bytesToReadFromBuffer
;
332 TRACE("(%p,%ld,%p,%ld,%p)\n",This
,ulOffset
.u
.LowPart
,pv
,cb
,pcbRead
);
334 * If the caller is not interested in the number of bytes read,
335 * we use another buffer to avoid "if" statements in the code.
338 pcbRead
= &bytesReadBuffer
;
341 * Make sure the offset is valid.
343 if (ulOffset
.u
.LowPart
> This
->byteArraySize
.u
.LowPart
)
347 * Using the known size of the array, calculate the number of bytes
350 bytesToReadFromBuffer
= min(This
->byteArraySize
.u
.LowPart
-
351 ulOffset
.u
.LowPart
, cb
);
354 * Lock the buffer in position and copy the data.
356 supportBuffer
= GlobalLock16(This
->supportHandle
);
359 (char *) supportBuffer
+ ulOffset
.u
.LowPart
,
360 bytesToReadFromBuffer
);
363 * Return the number of bytes read.
365 *pcbRead
= bytesToReadFromBuffer
;
370 GlobalUnlock16(This
->supportHandle
);
373 * The function returns S_OK if the specified number of bytes were read
374 * or the end of the array was reached.
375 * It returns STG_E_READFAULT if the number of bytes to read does not equal
376 * the number of bytes actually read.
381 return STG_E_READFAULT
;
384 /******************************************************************************
385 * This method is part of the ILockBytes interface.
387 * It writes the specified bytes at the specified offset.
388 * position. If the array is too small, it will be resized.
390 * See the documentation of ILockBytes for more info.
392 HRESULT WINAPI
HGLOBALLockBytesImpl16_WriteAt(
394 ULARGE_INTEGER ulOffset
, /* [in] */
395 const void* pv
, /* [in][size_is] */
397 ULONG
* pcbWritten
) /* [out] */
399 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)iface
;
402 ULARGE_INTEGER newSize
;
403 ULONG bytesWritten
= 0;
405 TRACE("(%p,%ld,%p,%ld,%p)\n",This
,ulOffset
.u
.LowPart
,pv
,cb
,pcbWritten
);
407 * If the caller is not interested in the number of bytes written,
408 * we use another buffer to avoid "if" statements in the code.
411 pcbWritten
= &bytesWritten
;
416 newSize
.u
.HighPart
= 0;
417 newSize
.u
.LowPart
= ulOffset
.u
.LowPart
+ cb
;
420 * Verify if we need to grow the stream
422 if (newSize
.u
.LowPart
> This
->byteArraySize
.u
.LowPart
)
425 if (HGLOBALLockBytesImpl16_SetSize(iface
, newSize
) == STG_E_MEDIUMFULL
)
426 return STG_E_MEDIUMFULL
;
430 * Lock the buffer in position and copy the data.
432 supportBuffer
= GlobalLock16(This
->supportHandle
);
434 memcpy((char *) supportBuffer
+ ulOffset
.u
.LowPart
, pv
, cb
);
437 * Return the number of bytes written.
444 GlobalUnlock16(This
->supportHandle
);
449 /******************************************************************************
450 * This method is part of the ILockBytes interface.
452 * See the documentation of ILockBytes for more info.
454 HRESULT WINAPI
HGLOBALLockBytesImpl16_Flush(ILockBytes16
* iface
)
456 TRACE("(%p)\n",iface
);
460 /******************************************************************************
461 * This method is part of the ILockBytes interface.
463 * It will change the size of the byte array.
465 * See the documentation of ILockBytes for more info.
467 HRESULT WINAPI
HGLOBALLockBytesImpl16_SetSize(
469 ULARGE_INTEGER libNewSize
) /* [in] */
471 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)iface
;
472 HGLOBAL16 supportHandle
;
474 TRACE("(%p,%ld)\n",This
,libNewSize
.u
.LowPart
);
478 if (libNewSize
.u
.HighPart
!= 0)
479 return STG_E_INVALIDFUNCTION
;
481 if (This
->byteArraySize
.u
.LowPart
== libNewSize
.u
.LowPart
)
485 * Re allocate the HGlobal to fit the new size of the stream.
487 supportHandle
= GlobalReAlloc16(This
->supportHandle
, libNewSize
.u
.LowPart
, 0);
489 if (supportHandle
== 0)
490 return STG_E_MEDIUMFULL
;
492 This
->supportHandle
= supportHandle
;
493 This
->byteArraySize
.u
.LowPart
= libNewSize
.u
.LowPart
;
498 /******************************************************************************
499 * This method is part of the ILockBytes interface.
501 * The global memory implementation of ILockBytes does not support locking.
503 * See the documentation of ILockBytes for more info.
505 HRESULT WINAPI
HGLOBALLockBytesImpl16_LockRegion(
507 ULARGE_INTEGER libOffset
, /* [in] */
508 ULARGE_INTEGER cb
, /* [in] */
509 DWORD dwLockType
) /* [in] */
511 return STG_E_INVALIDFUNCTION
;
514 /******************************************************************************
515 * This method is part of the ILockBytes interface.
517 * The global memory implementation of ILockBytes does not support locking.
519 * See the documentation of ILockBytes for more info.
521 HRESULT WINAPI
HGLOBALLockBytesImpl16_UnlockRegion(
523 ULARGE_INTEGER libOffset
, /* [in] */
524 ULARGE_INTEGER cb
, /* [in] */
525 DWORD dwLockType
) /* [in] */
527 return STG_E_INVALIDFUNCTION
;
530 /******************************************************************************
531 * This method is part of the ILockBytes interface.
533 * This method returns information about the current
536 * See the documentation of ILockBytes for more info.
538 HRESULT WINAPI
HGLOBALLockBytesImpl16_Stat(
540 STATSTG16
* pstatstg
, /* [out] */
541 DWORD grfStatFlag
) /* [in] */
543 HGLOBALLockBytesImpl16
* const This
=(HGLOBALLockBytesImpl16
*)iface
;
545 memset(pstatstg
, 0, sizeof(STATSTG16
));
547 pstatstg
->pwcsName
= NULL
;
548 pstatstg
->type
= STGTY_LOCKBYTES
;
549 pstatstg
->cbSize
= This
->byteArraySize
;
554 /******************************************************************************
555 * CreateILockBytesOnHGlobal [OLE2.54]
557 * Creates an ILockBytes interface for a HGLOBAL handle.
560 * hGlobal the global handle (16bit)
561 * fDeleteOnRelease delete handle on release.
562 * ppLkbyt pointer to ILockBytes interface.
565 * Staddard OLE error return codes.
568 HRESULT WINAPI
CreateILockBytesOnHGlobal16(
569 HGLOBAL16 hGlobal
, /* [in] */
570 BOOL16 fDeleteOnRelease
, /* [in] */
571 LPLOCKBYTES16
*ppLkbyt
) /* [out] (ptr to SEGPTR!) */
573 HGLOBALLockBytesImpl16
* newLockBytes
; /* SEGPTR */
575 newLockBytes
= HGLOBALLockBytesImpl16_Construct(hGlobal
, fDeleteOnRelease
);
577 if (newLockBytes
!= NULL
)
578 return HGLOBALLockBytesImpl16_QueryInterface((ILockBytes16
*)newLockBytes
,
581 return E_OUTOFMEMORY
;