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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 implements the ILockBytes interface and represents a byte array
47 * object supported by an HGLOBAL pointer.
49 struct HGLOBALLockBytesImpl16
52 * Needs to be the first item in the struct
53 * since we want to cast this in an ILockBytes pointer
55 const 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 /******************************************************************************
78 * HGLOBALLockBytesImpl16 implementation
82 /******************************************************************************
83 * This is the constructor for the HGLOBALLockBytesImpl16 class.
86 * hGlobal - Handle that will support the stream. can be NULL.
87 * fDeleteOnRelease - Flag set to TRUE if the HGLOBAL16 will be released
88 * when the IStream object is destroyed.
90 static HGLOBALLockBytesImpl16*
91 HGLOBALLockBytesImpl16_Construct(HGLOBAL16 hGlobal,
92 BOOL16 fDeleteOnRelease)
94 HGLOBALLockBytesImpl16* newLockBytes;
96 static ILockBytes16Vtbl vt16;
97 static SEGPTR msegvt16;
98 HMODULE16 hcomp = GetModuleHandle16("OLE2");
101 TRACE("(%x,%d)\n",hGlobal,fDeleteOnRelease);
102 newLockBytes = HeapAlloc(GetProcessHeap(), 0, sizeof(HGLOBALLockBytesImpl16));
103 if (newLockBytes == NULL)
107 * Set up the virtual function table and reference count.
111 #define VTENT(x) vt16.x = (void*)GetProcAddress16(hcomp,"HGLOBALLockBytesImpl16_"#x);assert(vt16.x)
112 VTENT(QueryInterface);
122 msegvt16 = MapLS( &vt16 );
124 newLockBytes->lpVtbl = (const ILockBytes16Vtbl*)msegvt16;
125 newLockBytes->ref = 0;
127 * Initialize the support.
129 newLockBytes->supportHandle = hGlobal;
130 newLockBytes->deleteOnRelease = fDeleteOnRelease;
133 * This method will allocate a handle if one is not supplied.
135 if (newLockBytes->supportHandle == 0)
136 newLockBytes->supportHandle = GlobalAlloc16(GMEM_MOVEABLE | GMEM_NODISCARD, 0);
139 * Initialize the size of the array to the size of the handle.
141 newLockBytes->byteArraySize.u.HighPart = 0;
142 newLockBytes->byteArraySize.u.LowPart = GlobalSize16(
143 newLockBytes->supportHandle);
145 return (HGLOBALLockBytesImpl16*)MapLS(newLockBytes);
148 /******************************************************************************
149 * This is the destructor of the HGLOBALStreamImpl class.
151 * This method will clean-up all the resources used-up by the given
152 * HGLOBALLockBytesImpl16 class. The pointer passed-in to this function will be
153 * freed and will not be valid anymore.
155 static void HGLOBALLockBytesImpl16_Destroy(HGLOBALLockBytesImpl16* This)
159 * Release the HGlobal if the constructor asked for that.
161 if (This->deleteOnRelease)
163 GlobalFree16(This->supportHandle);
164 This->supportHandle = 0;
168 * Finally, free the memory used-up by the class.
170 HeapFree(GetProcessHeap(), 0, This);
173 /******************************************************************************
174 * This implements the IUnknown method AddRef for this
177 ULONG CDECL HGLOBALLockBytesImpl16_AddRef(ILockBytes16* iface)
179 HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
181 TRACE("(%p)\n",This);
183 return InterlockedIncrement(&This->ref);
187 /******************************************************************************
188 * This implements the IUnknown method QueryInterface for this
191 HRESULT CDECL HGLOBALLockBytesImpl16_QueryInterface(
192 ILockBytes16* iface, /* [in] SEGPTR */
193 REFIID riid, /* [in] */
194 void** ppvObject) /* [out][iid_is] (ptr to SEGPTR!) */
196 HGLOBALLockBytesImpl16* const This = MapSL((SEGPTR)iface);
198 TRACE("(%p,%s,%p)\n",iface,debugstr_guid(riid),ppvObject);
200 * Perform a sanity check on the parameters.
206 * Initialize the return parameter.
210 * Compare the riid with the interface IDs implemented by this object.
212 if ( !memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) ||
213 !memcmp(&IID_ILockBytes, riid, sizeof(IID_ILockBytes))
215 *ppvObject = (void*)iface;
218 * Check that we obtained an interface.
220 if ((*ppvObject)==0) {
221 FIXME("Unknown IID %s\n", debugstr_guid(riid));
222 return E_NOINTERFACE;
226 * Query Interface always increases the reference count by one when it is
229 HGLOBALLockBytesImpl16_AddRef((ILockBytes16*)This);
234 /******************************************************************************
235 * This implements the IUnknown method Release for this
238 ULONG CDECL HGLOBALLockBytesImpl16_Release(ILockBytes16* iface)
240 HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
243 TRACE("(%p)\n",This);
245 ref = InterlockedDecrement(&This->ref);
248 * If the reference count goes down to 0, perform suicide.
251 HGLOBALLockBytesImpl16_Destroy(This);
255 /******************************************************************************
256 * This method is part of the ILockBytes interface.
258 * It reads a block of information from the byte array at the specified
261 * See the documentation of ILockBytes for more info.
263 HRESULT CDECL HGLOBALLockBytesImpl16_ReadAt(
265 ULARGE_INTEGER ulOffset, /* [in] */
266 void* pv, /* [out][length_is][size_is] */
268 ULONG* pcbRead) /* [out] */
270 HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
273 ULONG bytesReadBuffer = 0;
274 ULONG bytesToReadFromBuffer;
276 TRACE("(%p,%d,%p,%d,%p)\n",This,ulOffset.u.LowPart,pv,cb,pcbRead);
278 * If the caller is not interested in the number of bytes read,
279 * we use another buffer to avoid "if" statements in the code.
282 pcbRead = &bytesReadBuffer;
285 * Make sure the offset is valid.
287 if (ulOffset.u.LowPart > This->byteArraySize.u.LowPart)
291 * Using the known size of the array, calculate the number of bytes
294 bytesToReadFromBuffer = min(This->byteArraySize.u.LowPart -
295 ulOffset.u.LowPart, cb);
298 * Lock the buffer in position and copy the data.
300 supportBuffer = GlobalLock16(This->supportHandle);
303 (char *) supportBuffer + ulOffset.u.LowPart,
304 bytesToReadFromBuffer);
307 * Return the number of bytes read.
309 *pcbRead = bytesToReadFromBuffer;
314 GlobalUnlock16(This->supportHandle);
317 * The function returns S_OK if the specified number of bytes were read
318 * or the end of the array was reached.
319 * It returns STG_E_READFAULT if the number of bytes to read does not equal
320 * the number of bytes actually read.
325 return STG_E_READFAULT;
328 /******************************************************************************
329 * This method is part of the ILockBytes interface.
331 * It will change the size of the byte array.
333 * See the documentation of ILockBytes for more info.
335 HRESULT CDECL HGLOBALLockBytesImpl16_SetSize(
337 ULARGE_INTEGER libNewSize) /* [in] */
339 HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
340 HGLOBAL16 supportHandle;
342 TRACE("(%p,%d)\n",This,libNewSize.u.LowPart);
346 if (libNewSize.u.HighPart != 0)
347 return STG_E_INVALIDFUNCTION;
349 if (This->byteArraySize.u.LowPart == libNewSize.u.LowPart)
353 * Re allocate the HGlobal to fit the new size of the stream.
355 supportHandle = GlobalReAlloc16(This->supportHandle, libNewSize.u.LowPart, 0);
357 if (supportHandle == 0)
358 return STG_E_MEDIUMFULL;
360 This->supportHandle = supportHandle;
361 This->byteArraySize.u.LowPart = libNewSize.u.LowPart;
366 /******************************************************************************
367 * This method is part of the ILockBytes interface.
369 * It writes the specified bytes at the specified offset.
370 * position. If the array is too small, it will be resized.
372 * See the documentation of ILockBytes for more info.
374 HRESULT CDECL HGLOBALLockBytesImpl16_WriteAt(
376 ULARGE_INTEGER ulOffset, /* [in] */
377 const void* pv, /* [in][size_is] */
379 ULONG* pcbWritten) /* [out] */
381 HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
384 ULARGE_INTEGER newSize;
385 ULONG bytesWritten = 0;
387 TRACE("(%p,%d,%p,%d,%p)\n",This,ulOffset.u.LowPart,pv,cb,pcbWritten);
389 * If the caller is not interested in the number of bytes written,
390 * we use another buffer to avoid "if" statements in the code.
393 pcbWritten = &bytesWritten;
398 newSize.u.HighPart = 0;
399 newSize.u.LowPart = ulOffset.u.LowPart + cb;
402 * Verify if we need to grow the stream
404 if (newSize.u.LowPart > This->byteArraySize.u.LowPart)
407 if (HGLOBALLockBytesImpl16_SetSize(iface, newSize) == STG_E_MEDIUMFULL)
408 return STG_E_MEDIUMFULL;
412 * Lock the buffer in position and copy the data.
414 supportBuffer = GlobalLock16(This->supportHandle);
416 memcpy((char *) supportBuffer + ulOffset.u.LowPart, pv, cb);
419 * Return the number of bytes written.
426 GlobalUnlock16(This->supportHandle);
431 /******************************************************************************
432 * This method is part of the ILockBytes interface.
434 * See the documentation of ILockBytes for more info.
436 HRESULT CDECL HGLOBALLockBytesImpl16_Flush(ILockBytes16* iface)
438 TRACE("(%p)\n",iface);
442 /******************************************************************************
443 * This method is part of the ILockBytes interface.
445 * The global memory implementation of ILockBytes does not support locking.
447 * See the documentation of ILockBytes for more info.
449 HRESULT CDECL HGLOBALLockBytesImpl16_LockRegion(
451 ULARGE_INTEGER libOffset, /* [in] */
452 ULARGE_INTEGER cb, /* [in] */
453 DWORD dwLockType) /* [in] */
455 return STG_E_INVALIDFUNCTION;
458 /******************************************************************************
459 * This method is part of the ILockBytes interface.
461 * The global memory implementation of ILockBytes does not support locking.
463 * See the documentation of ILockBytes for more info.
465 HRESULT CDECL HGLOBALLockBytesImpl16_UnlockRegion(
467 ULARGE_INTEGER libOffset, /* [in] */
468 ULARGE_INTEGER cb, /* [in] */
469 DWORD dwLockType) /* [in] */
471 return STG_E_INVALIDFUNCTION;
474 /******************************************************************************
475 * This method is part of the ILockBytes interface.
477 * This method returns information about the current
480 * See the documentation of ILockBytes for more info.
482 HRESULT CDECL HGLOBALLockBytesImpl16_Stat(
484 STATSTG16* pstatstg, /* [out] */
485 DWORD grfStatFlag) /* [in] */
487 HGLOBALLockBytesImpl16* const This=(HGLOBALLockBytesImpl16*)iface;
489 memset(pstatstg, 0, sizeof(STATSTG16));
491 pstatstg->pwcsName = NULL;
492 pstatstg->type = STGTY_LOCKBYTES;
493 pstatstg->cbSize = This->byteArraySize;
498 /******************************************************************************
499 * CreateILockBytesOnHGlobal [OLE2.54]
501 * Creates an ILockBytes interface for a HGLOBAL handle.
504 * hGlobal the global handle (16bit)
505 * fDeleteOnRelease delete handle on release.
506 * ppLkbyt pointer to ILockBytes interface.
509 * Staddard OLE error return codes.
512 HRESULT WINAPI CreateILockBytesOnHGlobal16(
513 HGLOBAL16 hGlobal, /* [in] */
514 BOOL16 fDeleteOnRelease, /* [in] */
515 LPLOCKBYTES16 *ppLkbyt) /* [out] (ptr to SEGPTR!) */
517 HGLOBALLockBytesImpl16* newLockBytes; /* SEGPTR */
519 newLockBytes = HGLOBALLockBytesImpl16_Construct(hGlobal, fDeleteOnRelease);
521 if (newLockBytes != NULL)
522 return HGLOBALLockBytesImpl16_QueryInterface((ILockBytes16*)newLockBytes,
525 return E_OUTOFMEMORY;