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;