2 * Implementation of the StdGlobalInterfaceTable object
4 * The GlobalInterfaceTable (GIT) object is used to marshal interfaces between
5 * threading apartments (contexts). When you want to pass an interface but not
6 * as a parameter, it wouldn't get marshalled automatically, so you can use this
7 * object to insert the interface into a table, and you get back a cookie.
8 * Then when it's retrieved, it'll be unmarshalled into the right apartment.
10 * Copyright 2003 Mike Hearn <mike@theoretic.com>
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
36 #define NONAMELESSUNION
37 #define NONAMELESSSTRUCT
48 #include "compobj_private.h"
50 #include "wine/debug.h"
52 WINE_DEFAULT_DEBUG_CHANNEL(ole);
54 /****************************************************************************
55 * StdGlobalInterfaceTable definition
57 * This class implements IGlobalInterfaceTable and is a process-wide singleton
58 * used for marshalling interfaces between threading apartments using cookies.
61 /* Each entry in the linked list of GIT entries */
62 typedef struct StdGITEntry
65 IID iid; /* IID of the interface */
66 IStream* stream; /* Holds the marshalled interface */
68 struct StdGITEntry* next;
69 struct StdGITEntry* prev;
73 typedef struct StdGlobalInterfaceTableImpl
75 const IGlobalInterfaceTableVtbl *lpVtbl;
78 struct StdGITEntry* firstEntry;
79 struct StdGITEntry* lastEntry;
82 } StdGlobalInterfaceTableImpl;
84 void* StdGlobalInterfaceTableInstance;
86 static CRITICAL_SECTION git_section;
87 static CRITICAL_SECTION_DEBUG critsect_debug =
90 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
91 0, 0, { (DWORD_PTR)(__FILE__ ": global interface table") }
93 static CRITICAL_SECTION git_section = { &critsect_debug, -1, 0, 0, 0, 0 };
96 /** This destroys it again. It should revoke all the held interfaces first **/
97 static void StdGlobalInterfaceTable_Destroy(void* self)
99 TRACE("(%p)\n", self);
100 FIXME("Revoke held interfaces here\n");
102 HeapFree(GetProcessHeap(), 0, self);
103 StdGlobalInterfaceTableInstance = NULL;
107 * A helper function to traverse the list and find the entry that matches the cookie.
108 * Returns NULL if not found
111 StdGlobalInterfaceTable_FindEntry(IGlobalInterfaceTable* iface, DWORD cookie)
113 StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
116 TRACE("iface=%p, cookie=0x%x\n", iface, (UINT)cookie);
118 EnterCriticalSection(&git_section);
119 e = self->firstEntry;
121 if (e->cookie == cookie) {
122 LeaveCriticalSection(&git_section);
127 LeaveCriticalSection(&git_section);
129 TRACE("Entry not found\n");
134 * Here's the boring boilerplate stuff for IUnknown
137 static HRESULT WINAPI
138 StdGlobalInterfaceTable_QueryInterface(IGlobalInterfaceTable* iface,
139 REFIID riid, void** ppvObject)
141 /* Make sure silly coders can't crash us */
142 if (ppvObject == 0) return E_INVALIDARG;
144 *ppvObject = 0; /* assume we don't have the interface */
146 /* Do we implement that interface? */
147 if (IsEqualIID(&IID_IUnknown, riid) ||
148 IsEqualIID(&IID_IGlobalInterfaceTable, riid))
151 return E_NOINTERFACE;
153 /* Now inc the refcount */
154 IGlobalInterfaceTable_AddRef(iface);
159 StdGlobalInterfaceTable_AddRef(IGlobalInterfaceTable* iface)
161 StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
163 /* InterlockedIncrement(&self->ref); */
168 StdGlobalInterfaceTable_Release(IGlobalInterfaceTable* iface)
170 StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
172 /* InterlockedDecrement(&self->ref); */
173 if (self->ref == 0) {
174 /* Hey ho, it's time to go, so long again 'till next weeks show! */
175 StdGlobalInterfaceTable_Destroy(self);
183 * Now implement the actual IGlobalInterfaceTable interface
186 static HRESULT WINAPI
187 StdGlobalInterfaceTable_RegisterInterfaceInGlobal(
188 IGlobalInterfaceTable* iface, IUnknown* pUnk,
189 REFIID riid, DWORD* pdwCookie)
191 StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
192 IStream* stream = NULL;
197 TRACE("iface=%p, pUnk=%p, riid=%s, pdwCookie=0x%p\n", iface, pUnk, debugstr_guid(riid), pdwCookie);
199 if (pUnk == NULL) return E_INVALIDARG;
201 /* marshal the interface */
202 TRACE("About to marshal the interface\n");
204 hres = CreateStreamOnHGlobal(0, TRUE, &stream);
205 if (hres) return hres;
206 hres = CoMarshalInterface(stream, riid, pUnk, MSHCTX_INPROC, NULL, MSHLFLAGS_TABLESTRONG);
209 IStream_Release(stream);
214 IStream_Seek(stream, zero, SEEK_SET, NULL);
216 entry = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGITEntry));
217 if (entry == NULL) return E_OUTOFMEMORY;
219 EnterCriticalSection(&git_section);
222 entry->stream = stream;
223 entry->cookie = self->nextCookie;
224 self->nextCookie++; /* inc the cookie count */
226 /* insert the new entry at the end of the list */
228 entry->prev = self->lastEntry;
229 if (entry->prev) entry->prev->next = entry;
230 else self->firstEntry = entry;
231 self->lastEntry = entry;
233 /* and return the cookie */
234 *pdwCookie = entry->cookie;
236 LeaveCriticalSection(&git_section);
238 TRACE("Cookie is 0x%lx\n", entry->cookie);
242 static HRESULT WINAPI
243 StdGlobalInterfaceTable_RevokeInterfaceFromGlobal(
244 IGlobalInterfaceTable* iface, DWORD dwCookie)
246 StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
250 TRACE("iface=%p, dwCookie=0x%x\n", iface, (UINT)dwCookie);
252 entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
254 TRACE("Entry not found\n");
255 return E_INVALIDARG; /* not found */
258 /* Free the stream */
259 hr = CoReleaseMarshalData(entry->stream);
262 WARN("Failed to release marshal data, hr = 0x%08lx\n", hr);
265 IStream_Release(entry->stream);
267 /* chop entry out of the list, and free the memory */
268 EnterCriticalSection(&git_section);
269 if (entry->prev) entry->prev->next = entry->next;
270 else self->firstEntry = entry->next;
271 if (entry->next) entry->next->prev = entry->prev;
272 else self->lastEntry = entry->prev;
273 LeaveCriticalSection(&git_section);
275 HeapFree(GetProcessHeap(), 0, entry);
279 static HRESULT WINAPI
280 StdGlobalInterfaceTable_GetInterfaceFromGlobal(
281 IGlobalInterfaceTable* iface, DWORD dwCookie,
282 REFIID riid, void **ppv)
289 TRACE("dwCookie=0x%lx, riid=%s, ppv=%p\n", dwCookie, debugstr_guid(riid), ppv);
291 entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
292 if (entry == NULL) return E_INVALIDARG;
294 if (!IsEqualIID(&entry->iid, riid)) {
295 WARN("entry->iid (%s) != riid\n", debugstr_guid(&entry->iid));
298 TRACE("entry=%p\n", entry);
300 /* unmarshal the interface */
301 hres = CoUnmarshalInterface(entry->stream, riid, ppv);
303 /* rewind stream, in case it's used again */
306 IStream_Seek(entry->stream, move, STREAM_SEEK_SET, NULL);
309 WARN("Failed to unmarshal stream\n");
315 IUnknown_AddRef(lpUnk);
316 TRACE("ppv=%p\n", *ppv);
320 /* Classfactory definition - despite what MSDN says, some programs need this */
322 static HRESULT WINAPI
323 GITCF_QueryInterface(LPCLASSFACTORY iface,REFIID riid, LPVOID *ppv)
326 if (IsEqualIID(riid,&IID_IUnknown) ||
327 IsEqualIID(riid,&IID_IGlobalInterfaceTable))
329 *ppv = (LPVOID)iface;
332 return E_NOINTERFACE;
335 static ULONG WINAPI GITCF_AddRef(LPCLASSFACTORY iface)
340 static ULONG WINAPI GITCF_Release(LPCLASSFACTORY iface)
345 static HRESULT WINAPI
346 GITCF_CreateInstance(LPCLASSFACTORY iface, LPUNKNOWN pUnk,
347 REFIID riid, LPVOID *ppv)
349 if (IsEqualIID(riid,&IID_IGlobalInterfaceTable)) {
350 if (StdGlobalInterfaceTableInstance == NULL)
351 StdGlobalInterfaceTableInstance = StdGlobalInterfaceTable_Construct();
352 return IGlobalInterfaceTable_QueryInterface( (IGlobalInterfaceTable*) StdGlobalInterfaceTableInstance, riid, ppv);
355 FIXME("(%s), not supported.\n",debugstr_guid(riid));
356 return E_NOINTERFACE;
359 static HRESULT WINAPI GITCF_LockServer(LPCLASSFACTORY iface, BOOL fLock)
361 FIXME("(%d), stub!\n",fLock);
365 static const IClassFactoryVtbl GITClassFactoryVtbl = {
366 GITCF_QueryInterface,
369 GITCF_CreateInstance,
373 static const IClassFactoryVtbl *PGITClassFactoryVtbl = &GITClassFactoryVtbl;
375 HRESULT StdGlobalInterfaceTable_GetFactory(LPVOID *ppv)
377 *ppv = &PGITClassFactoryVtbl;
378 TRACE("Returning GIT classfactory\n");
382 /* Virtual function table */
383 static const IGlobalInterfaceTableVtbl StdGlobalInterfaceTableImpl_Vtbl =
385 StdGlobalInterfaceTable_QueryInterface,
386 StdGlobalInterfaceTable_AddRef,
387 StdGlobalInterfaceTable_Release,
388 StdGlobalInterfaceTable_RegisterInterfaceInGlobal,
389 StdGlobalInterfaceTable_RevokeInterfaceFromGlobal,
390 StdGlobalInterfaceTable_GetInterfaceFromGlobal
393 /** This function constructs the GIT. It should only be called once **/
394 void* StdGlobalInterfaceTable_Construct(void)
396 StdGlobalInterfaceTableImpl* newGIT;
398 newGIT = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGlobalInterfaceTableImpl));
399 if (newGIT == 0) return newGIT;
401 newGIT->lpVtbl = &StdGlobalInterfaceTableImpl_Vtbl;
402 newGIT->ref = 1; /* Initialise the reference count */
403 newGIT->firstEntry = NULL; /* we start with an empty table */
404 newGIT->lastEntry = NULL;
405 newGIT->nextCookie = 0xf100; /* that's where windows starts, so that's where we start */
406 TRACE("Created the GIT at %p\n", newGIT);
408 return (void*)newGIT;