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[wine] / dlls / shlwapi / regstream.c
1 /*
2  * SHLWAPI Registry Stream functions
3  *
4  * Copyright 1999 Juergen Schmied
5  * Copyright 2002 Jon Griffiths
6  *
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.
11  *
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.
16  *
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20  */
21
22 #include <stdarg.h>
23 #include <string.h>
24
25 #define COBJMACROS
26
27 #include "winerror.h"
28 #include "windef.h"
29 #include "winbase.h"
30 #include "objbase.h"
31 #include "winreg.h"
32 #include "shlwapi.h"
33
34 #include "wine/debug.h"
35
36 WINE_DEFAULT_DEBUG_CHANNEL(shell);
37
38 typedef struct
39 {
40         const IStreamVtbl *lpVtbl;
41         LONG   ref;
42         HKEY   hKey;
43         LPBYTE pbBuffer;
44         DWORD  dwLength;
45         DWORD  dwPos;
46 } ISHRegStream;
47
48 /**************************************************************************
49 *  IStream_fnQueryInterface
50 */
51 static HRESULT WINAPI IStream_fnQueryInterface(IStream *iface, REFIID riid, LPVOID *ppvObj)
52 {
53         ISHRegStream *This = (ISHRegStream *)iface;
54
55         TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);
56
57         *ppvObj = NULL;
58
59         if(IsEqualIID(riid, &IID_IUnknown))     /*IUnknown*/
60           *ppvObj = This;
61         else if(IsEqualIID(riid, &IID_IStream)) /*IStream*/
62           *ppvObj = This;
63
64         if(*ppvObj)
65         {
66           IStream_AddRef((IStream*)*ppvObj);
67           TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
68           return S_OK;
69         }
70         TRACE("-- Interface: E_NOINTERFACE\n");
71         return E_NOINTERFACE;
72 }
73
74 /**************************************************************************
75 *  IStream_fnAddRef
76 */
77 static ULONG WINAPI IStream_fnAddRef(IStream *iface)
78 {
79         ISHRegStream *This = (ISHRegStream *)iface;
80         ULONG refCount = InterlockedIncrement(&This->ref);
81         
82         TRACE("(%p)->(ref before=%u)\n",This, refCount - 1);
83
84         return refCount;
85 }
86
87 /**************************************************************************
88 *  IStream_fnRelease
89 */
90 static ULONG WINAPI IStream_fnRelease(IStream *iface)
91 {
92         ISHRegStream *This = (ISHRegStream *)iface;
93         ULONG refCount = InterlockedDecrement(&This->ref);
94
95         TRACE("(%p)->(ref before=%u)\n",This, refCount + 1);
96
97         if (!refCount)
98         {
99           TRACE(" destroying SHReg IStream (%p)\n",This);
100
101           HeapFree(GetProcessHeap(),0,This->pbBuffer);
102
103           if (This->hKey)
104             RegCloseKey(This->hKey);
105
106           HeapFree(GetProcessHeap(),0,This);
107           return 0;
108         }
109
110         return refCount;
111 }
112
113 /**************************************************************************
114  * IStream_fnRead
115  */
116 static HRESULT WINAPI IStream_fnRead (IStream * iface, void* pv, ULONG cb, ULONG* pcbRead)
117 {
118         ISHRegStream *This = (ISHRegStream *)iface;
119
120         DWORD dwBytesToRead, dwBytesLeft;
121
122         TRACE("(%p)->(%p,0x%08x,%p)\n",This, pv, cb, pcbRead);
123
124         if (!pv)
125           return STG_E_INVALIDPOINTER;
126
127         dwBytesLeft = This->dwLength - This->dwPos;
128
129         if ( 0 >= dwBytesLeft ) /* end of buffer */
130           return S_FALSE;
131
132         dwBytesToRead = ( cb > dwBytesLeft) ? dwBytesLeft : cb;
133
134         memmove ( pv, (This->pbBuffer) + (This->dwPos), dwBytesToRead);
135
136         This->dwPos += dwBytesToRead; /* adjust pointer */
137
138         if (pcbRead)
139           *pcbRead = dwBytesToRead;
140
141         return S_OK;
142 }
143
144 /**************************************************************************
145  * IStream_fnWrite
146  */
147 static HRESULT WINAPI IStream_fnWrite (IStream * iface, const void* pv, ULONG cb, ULONG* pcbWritten)
148 {
149         ISHRegStream *This = (ISHRegStream *)iface;
150
151         TRACE("(%p)\n",This);
152
153         if (pcbWritten)
154           *pcbWritten = 0;
155
156         return E_NOTIMPL;
157 }
158
159 /**************************************************************************
160  *  IStream_fnSeek
161  */
162 static HRESULT WINAPI IStream_fnSeek (IStream * iface, LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER* plibNewPosition)
163 {
164         ISHRegStream *This = (ISHRegStream *)iface;
165
166         TRACE("(%p)\n",This);
167
168         if (plibNewPosition)
169           plibNewPosition->QuadPart = 0;
170         return E_NOTIMPL;
171 }
172
173 /**************************************************************************
174  * IStream_fnSetSize
175  */
176 static HRESULT WINAPI IStream_fnSetSize (IStream * iface, ULARGE_INTEGER libNewSize)
177 {
178         ISHRegStream *This = (ISHRegStream *)iface;
179
180         TRACE("(%p)\n",This);
181         return E_NOTIMPL;
182 }
183
184 /**************************************************************************
185  * IStream_fnCopyTo
186  */
187 static HRESULT WINAPI IStream_fnCopyTo (IStream * iface, IStream* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER* pcbRead, ULARGE_INTEGER* pcbWritten)
188 {
189         ISHRegStream *This = (ISHRegStream *)iface;
190
191         TRACE("(%p)\n",This);
192         if (pcbRead)
193           pcbRead->QuadPart = 0;
194         if (pcbWritten)
195           pcbWritten->QuadPart = 0;
196         return E_NOTIMPL;
197 }
198
199 /**************************************************************************
200  * IStream_fnCommit
201  */
202 static HRESULT WINAPI IStream_fnCommit (IStream * iface, DWORD grfCommitFlags)
203 {
204         ISHRegStream *This = (ISHRegStream *)iface;
205
206         TRACE("(%p)\n",This);
207
208         return E_NOTIMPL;
209 }
210
211 /**************************************************************************
212  * IStream_fnRevert
213  */
214 static HRESULT WINAPI IStream_fnRevert (IStream * iface)
215 {
216         ISHRegStream *This = (ISHRegStream *)iface;
217
218         TRACE("(%p)\n",This);
219
220         return E_NOTIMPL;
221 }
222
223 /**************************************************************************
224  * IStream_fnLockUnlockRegion
225  */
226 static HRESULT WINAPI IStream_fnLockUnlockRegion (IStream * iface, ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType)
227 {
228         ISHRegStream *This = (ISHRegStream *)iface;
229
230         TRACE("(%p)\n",This);
231
232         return E_NOTIMPL;
233 }
234
235 /*************************************************************************
236  * IStream_fnStat
237  */
238 static HRESULT WINAPI IStream_fnStat (IStream * iface, STATSTG*   pstatstg, DWORD grfStatFlag)
239 {
240         ISHRegStream *This = (ISHRegStream *)iface;
241
242         TRACE("(%p)\n",This);
243
244         return E_NOTIMPL;
245 }
246
247 /*************************************************************************
248  * IStream_fnClone
249  */
250 static HRESULT WINAPI IStream_fnClone (IStream * iface, IStream** ppstm)
251 {
252         ISHRegStream *This = (ISHRegStream *)iface;
253
254         TRACE("(%p)\n",This);
255         if (ppstm)
256           *ppstm = NULL;
257         return E_NOTIMPL;
258 }
259
260 static const IStreamVtbl rstvt =
261 {
262         IStream_fnQueryInterface,
263         IStream_fnAddRef,
264         IStream_fnRelease,
265         IStream_fnRead,
266         IStream_fnWrite,
267         IStream_fnSeek,
268         IStream_fnSetSize,
269         IStream_fnCopyTo,
270         IStream_fnCommit,
271         IStream_fnRevert,
272         IStream_fnLockUnlockRegion,
273         IStream_fnLockUnlockRegion,
274         IStream_fnStat,
275         IStream_fnClone
276 };
277
278 /* Methods overridden by the dummy stream */
279
280 /**************************************************************************
281  *  IStream_fnAddRefDummy
282  */
283 static ULONG WINAPI IStream_fnAddRefDummy(IStream *iface)
284 {
285         ISHRegStream *This = (ISHRegStream *)iface;
286         TRACE("(%p)\n", This);
287         return 2;
288 }
289
290 /**************************************************************************
291  *  IStream_fnReleaseDummy
292  */
293 static ULONG WINAPI IStream_fnReleaseDummy(IStream *iface)
294 {
295         ISHRegStream *This = (ISHRegStream *)iface;
296         TRACE("(%p)\n", This);
297         return 1;
298 }
299
300 /**************************************************************************
301  * IStream_fnReadDummy
302  */
303 static HRESULT WINAPI IStream_fnReadDummy(IStream *iface, LPVOID pv, ULONG cb, ULONG* pcbRead)
304 {
305   if (pcbRead)
306     *pcbRead = 0;
307   return E_NOTIMPL;
308 }
309
310 static const IStreamVtbl DummyRegStreamVTable =
311 {
312   IStream_fnQueryInterface,
313   IStream_fnAddRefDummy,  /* Overridden */
314   IStream_fnReleaseDummy, /* Overridden */
315   IStream_fnReadDummy,    /* Overridden */
316   IStream_fnWrite,
317   IStream_fnSeek,
318   IStream_fnSetSize,
319   IStream_fnCopyTo,
320   IStream_fnCommit,
321   IStream_fnRevert,
322   IStream_fnLockUnlockRegion,
323   IStream_fnLockUnlockRegion,
324   IStream_fnStat,
325   IStream_fnClone
326 };
327
328 /* Dummy registry stream object */
329 static ISHRegStream rsDummyRegStream =
330 {
331  &DummyRegStreamVTable,
332  1,
333  NULL,
334  NULL,
335  0,
336  0
337 };
338
339 /**************************************************************************
340  * IStream_Create
341  *
342  * Internal helper: Create and initialise a new registry stream object.
343  */
344 static IStream *IStream_Create(HKEY hKey, LPBYTE pbBuffer, DWORD dwLength)
345 {
346  ISHRegStream* regStream;
347
348  regStream = HeapAlloc(GetProcessHeap(), 0, sizeof(ISHRegStream));
349
350  if (regStream)
351  {
352    regStream->lpVtbl = &rstvt;
353    regStream->ref = 1;
354    regStream->hKey = hKey;
355    regStream->pbBuffer = pbBuffer;
356    regStream->dwLength = dwLength;
357    regStream->dwPos = 0;
358  }
359  TRACE ("Returning %p\n", regStream);
360  return (IStream *)regStream;
361 }
362
363 /*************************************************************************
364  * SHOpenRegStream2A    [SHLWAPI.@]
365  *
366  * Create a stream to read binary registry data.
367  *
368  * PARAMS
369  * hKey      [I] Registry handle
370  * pszSubkey [I] The sub key name
371  * pszValue  [I] The value name under the sub key
372  * dwMode    [I] Unused
373  *
374  * RETURNS
375  * Success: An IStream interface referring to the registry data
376  * Failure: NULL, if the registry key could not be opened or is not binary.
377  */
378 IStream * WINAPI SHOpenRegStream2A(HKEY hKey, LPCSTR pszSubkey,
379                                    LPCSTR pszValue,DWORD dwMode)
380 {
381   HKEY hStrKey = NULL;
382   LPBYTE lpBuff = NULL;
383   DWORD dwLength, dwType;
384
385   TRACE("(%p,%s,%s,0x%08x)\n", hKey, pszSubkey, pszValue, dwMode);
386
387   /* Open the key, read in binary data and create stream */
388   if (!RegOpenKeyExA (hKey, pszSubkey, 0, KEY_READ, &hStrKey) &&
389       !RegQueryValueExA (hStrKey, pszValue, 0, 0, 0, &dwLength) &&
390       (lpBuff = HeapAlloc (GetProcessHeap(), 0, dwLength)) &&
391       !RegQueryValueExA (hStrKey, pszValue, 0, &dwType, lpBuff, &dwLength) &&
392       dwType == REG_BINARY)
393     return IStream_Create(hStrKey, lpBuff, dwLength);
394
395   HeapFree (GetProcessHeap(), 0, lpBuff);
396   if (hStrKey)
397     RegCloseKey(hStrKey);
398   return NULL;
399 }
400
401 /*************************************************************************
402  * SHOpenRegStream2W    [SHLWAPI.@]
403  *
404  * See SHOpenRegStream2A.
405  */
406 IStream * WINAPI SHOpenRegStream2W(HKEY hKey, LPCWSTR pszSubkey,
407                                    LPCWSTR pszValue, DWORD dwMode)
408 {
409   HKEY hStrKey = NULL;
410   LPBYTE lpBuff = NULL;
411   DWORD dwLength, dwType;
412
413   TRACE("(%p,%s,%s,0x%08x)\n", hKey, debugstr_w(pszSubkey),
414         debugstr_w(pszValue), dwMode);
415
416   /* Open the key, read in binary data and create stream */
417   if (!RegOpenKeyExW (hKey, pszSubkey, 0, KEY_READ, &hStrKey) &&
418       !RegQueryValueExW (hStrKey, pszValue, 0, 0, 0, &dwLength) &&
419       (lpBuff = HeapAlloc (GetProcessHeap(), 0, dwLength)) &&
420       !RegQueryValueExW (hStrKey, pszValue, 0, &dwType, lpBuff, &dwLength) &&
421       dwType == REG_BINARY)
422     return IStream_Create(hStrKey, lpBuff, dwLength);
423
424   HeapFree (GetProcessHeap(), 0, lpBuff);
425   if (hStrKey)
426     RegCloseKey(hStrKey);
427   return NULL;
428 }
429
430 /*************************************************************************
431  * SHOpenRegStreamA     [SHLWAPI.@]
432  *
433  * Create a stream to read binary registry data.
434  *
435  * PARAMS
436  * hKey      [I] Registry handle
437  * pszSubkey [I] The sub key name
438  * pszValue  [I] The value name under the sub key
439  * dwMode    [I] STGM mode for opening the file
440  *
441  * RETURNS
442  * Success: An IStream interface referring to the registry data
443  * Failure: If the registry key could not be opened or is not binary,
444  *          A dummy (empty) IStream object is returned.
445  */
446 IStream * WINAPI SHOpenRegStreamA(HKEY hkey, LPCSTR pszSubkey,
447                                   LPCSTR pszValue, DWORD dwMode)
448 {
449   IStream *iStream;
450
451   TRACE("(%p,%s,%s,0x%08x)\n", hkey, pszSubkey, pszValue, dwMode);
452
453   iStream = SHOpenRegStream2A(hkey, pszSubkey, pszValue, dwMode);
454   return iStream ? iStream : (IStream *)&rsDummyRegStream;
455 }
456
457 /*************************************************************************
458  * SHOpenRegStreamW     [SHLWAPI.@]
459  *
460  * See SHOpenRegStreamA.
461  */
462 IStream * WINAPI SHOpenRegStreamW(HKEY hkey, LPCWSTR pszSubkey,
463                                   LPCWSTR pszValue, DWORD dwMode)
464 {
465   IStream *iStream;
466
467   TRACE("(%p,%s,%s,0x%08x)\n", hkey, debugstr_w(pszSubkey),
468         debugstr_w(pszValue), dwMode);
469   iStream = SHOpenRegStream2W(hkey, pszSubkey, pszValue, dwMode);
470   return iStream ? iStream : (IStream *)&rsDummyRegStream;
471 }
472
473 /*************************************************************************
474  * @   [SHLWAPI.12]
475  *
476  * Create an IStream object on a block of memory.
477  *
478  * PARAMS
479  * lpbData   [I] Memory block to create the IStream object on
480  * dwDataLen [I] Length of data block
481  *
482  * RETURNS
483  * Success: A pointer to the IStream object.
484  * Failure: NULL, if any parameters are invalid or an error occurs.
485  *
486  * NOTES
487  *  A copy of the memory pointed to by lpbData is made, and is freed
488  *  when the stream is released.
489  */
490 IStream * WINAPI SHCreateMemStream(LPBYTE lpbData, DWORD dwDataLen)
491 {
492   IStream *iStrmRet = NULL;
493
494   TRACE("(%p,%d)\n", lpbData, dwDataLen);
495
496   if (lpbData)
497   {
498     LPBYTE lpbDup = HeapAlloc(GetProcessHeap(), 0, dwDataLen);
499
500     if (lpbDup)
501     {
502       memcpy(lpbDup, lpbData, dwDataLen);
503       iStrmRet = IStream_Create(NULL, lpbDup, dwDataLen);
504
505       if (!iStrmRet)
506         HeapFree(GetProcessHeap(), 0, lpbDup);
507     }
508   }
509   return iStrmRet;
510 }
511
512 /*************************************************************************
513  * SHCreateStreamWrapper   [SHLWAPI.@]
514  *
515  * Create an IStream object on a block of memory.
516  *
517  * PARAMS
518  * lpbData    [I] Memory block to create the IStream object on
519  * dwDataLen  [I] Length of data block
520  * dwReserved [I] Reserved, Must be 0.
521  * lppStream  [O] Destination for IStream object
522  *
523  * RETURNS
524  * Success: S_OK. lppStream contains the new IStream object.
525  * Failure: E_INVALIDARG, if any parameters are invalid,
526  *          E_OUTOFMEMORY if memory allocation fails.
527  *
528  * NOTES
529  *  The stream assumes ownership of the memory passed to it.
530  */
531 HRESULT WINAPI SHCreateStreamWrapper(LPBYTE lpbData, DWORD dwDataLen,
532                                      DWORD dwReserved, IStream **lppStream)
533 {
534   IStream* lpStream;
535
536   if (lppStream)
537     *lppStream = NULL;
538
539   if(dwReserved || !lppStream)
540     return E_INVALIDARG;
541
542   lpStream = IStream_Create(NULL, lpbData, dwDataLen);
543
544   if(!lpStream)
545     return E_OUTOFMEMORY;
546
547   IStream_QueryInterface(lpStream, &IID_IStream, (void**)lppStream);
548   IStream_Release(lpStream);
549   return S_OK;
550 }