dlls/ole32/git.c

   1 /*
   2  * Implementation of the StdGlobalInterfaceTable object
   3  *
   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.
   9  *
  10  * Copyright 2003 Mike Hearn <mike@theoretic.com>
  11  *
  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.
  16  *
  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.
  21  *
  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
  25  */
  26
  27 #include <stdarg.h>
  28
  29 #define COBJMACROS
  30 #define NONAMELESSUNION
  31 #define NONAMELESSSTRUCT
  32
  33 #include "windef.h"
  34 #include "winbase.h"
  35 #include "winuser.h"
  36 #include "objbase.h"
  37 #include "ole2.h"
  38 #include "winerror.h"
  39
  40 #include "compobj_private.h"
  41
  42 #include "wine/list.h"
  43 #include "wine/debug.h"
  44
  45 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  46
  47 /****************************************************************************
  48  * StdGlobalInterfaceTable definition
  49  *
  50  * This class implements IGlobalInterfaceTable and is a process-wide singleton
  51  * used for marshalling interfaces between threading apartments using cookies.
  52  */
  53
  54 /* Each entry in the linked list of GIT entries */
  55 typedef struct StdGITEntry
  56 {
  57   DWORD cookie;
  58   IID iid;         /* IID of the interface */
  59   IStream* stream; /* Holds the marshalled interface */
  60
  61   struct list entry;
  62 } StdGITEntry;
  63
  64 /* Class data */
  65 typedef struct StdGlobalInterfaceTableImpl
  66 {
  67   const IGlobalInterfaceTableVtbl *lpVtbl;
  68
  69   ULONG ref;
  70   struct list list;
  71   ULONG nextCookie;
  72
  73 } StdGlobalInterfaceTableImpl;
  74
  75 void* StdGlobalInterfaceTableInstance;
  76
  77 static CRITICAL_SECTION git_section;
  78 static CRITICAL_SECTION_DEBUG critsect_debug =
  79 {
  80     0, 0, &git_section,
  81     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  82       0, 0, { (DWORD_PTR)(__FILE__ ": global interface table") }
  83 };
  84 static CRITICAL_SECTION git_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  85
  86
  87 /** This destroys it again. It should revoke all the held interfaces first **/
  88 static void StdGlobalInterfaceTable_Destroy(void* self)
  89 {
  90   TRACE("(%p)\n", self);
  91   FIXME("Revoke held interfaces here\n");
  92
  93   HeapFree(GetProcessHeap(), 0, self);
  94   StdGlobalInterfaceTableInstance = NULL;
  95 }
  96
  97 /***
  98  * A helper function to traverse the list and find the entry that matches the cookie.
  99  * Returns NULL if not found. Must be called inside git_section critical section.
 100  */
 101 static StdGITEntry*
 102 StdGlobalInterfaceTable_FindEntry(IGlobalInterfaceTable* iface, DWORD cookie)
 103 {
 104   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 105   StdGITEntry* e;
 106
 107   TRACE("iface=%p, cookie=0x%x\n", iface, (UINT)cookie);
 108
 109   LIST_FOR_EACH_ENTRY(e, &self->list, StdGITEntry, entry) {
 110     if (e->cookie == cookie)
 111       return e;
 112   }
 113
 114   TRACE("Entry not found\n");
 115   return NULL;
 116 }
 117
 118 /***
 119  * Here's the boring boilerplate stuff for IUnknown
 120  */
 121
 122 static HRESULT WINAPI
 123 StdGlobalInterfaceTable_QueryInterface(IGlobalInterfaceTable* iface,
 124                REFIID riid, void** ppvObject)
 125 {
 126   /* Make sure silly coders can't crash us */
 127   if (ppvObject == 0) return E_INVALIDARG;
 128
 129   *ppvObject = 0; /* assume we don't have the interface */
 130
 131   /* Do we implement that interface? */
 132   if (IsEqualIID(&IID_IUnknown, riid) ||
 133       IsEqualIID(&IID_IGlobalInterfaceTable, riid))
 134     *ppvObject = iface;
 135   else
 136     return E_NOINTERFACE;
 137
 138   /* Now inc the refcount */
 139   IGlobalInterfaceTable_AddRef(iface);
 140   return S_OK;
 141 }
 142
 143 static ULONG WINAPI
 144 StdGlobalInterfaceTable_AddRef(IGlobalInterfaceTable* iface)
 145 {
 146   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 147
 148   /* InterlockedIncrement(&self->ref); */
 149   return self->ref;
 150 }
 151
 152 static ULONG WINAPI
 153 StdGlobalInterfaceTable_Release(IGlobalInterfaceTable* iface)
 154 {
 155   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 156
 157   /* InterlockedDecrement(&self->ref); */
 158   if (self->ref == 0) {
 159     /* Hey ho, it's time to go, so long again 'till next weeks show! */
 160     StdGlobalInterfaceTable_Destroy(self);
 161     return 0;
 162   }
 163
 164   return self->ref;
 165 }
 166
 167 /***
 168  * Now implement the actual IGlobalInterfaceTable interface
 169  */
 170
 171 static HRESULT WINAPI
 172 StdGlobalInterfaceTable_RegisterInterfaceInGlobal(
 173                IGlobalInterfaceTable* iface, IUnknown* pUnk,
 174                REFIID riid, DWORD* pdwCookie)
 175 {
 176   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 177   IStream* stream = NULL;
 178   HRESULT hres;
 179   StdGITEntry* entry;
 180   LARGE_INTEGER zero;
 181
 182   TRACE("iface=%p, pUnk=%p, riid=%s, pdwCookie=0x%p\n", iface, pUnk, debugstr_guid(riid), pdwCookie);
 183
 184   if (pUnk == NULL) return E_INVALIDARG;
 185
 186   /* marshal the interface */
 187   TRACE("About to marshal the interface\n");
 188
 189   hres = CreateStreamOnHGlobal(0, TRUE, &stream);
 190   if (hres) return hres;
 191   hres = CoMarshalInterface(stream, riid, pUnk, MSHCTX_INPROC, NULL, MSHLFLAGS_TABLESTRONG);
 192   if (hres)
 193   {
 194     IStream_Release(stream);
 195     return hres;
 196   }
 197
 198   zero.QuadPart = 0;
 199   IStream_Seek(stream, zero, STREAM_SEEK_SET, NULL);
 200
 201   entry = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGITEntry));
 202   if (entry == NULL) return E_OUTOFMEMORY;
 203
 204   EnterCriticalSection(&git_section);
 205
 206   entry->iid = *riid;
 207   entry->stream = stream;
 208   entry->cookie = self->nextCookie;
 209   self->nextCookie++; /* inc the cookie count */
 210
 211   /* insert the new entry at the end of the list */
 212   list_add_tail(&self->list, &entry->entry);
 213
 214   /* and return the cookie */
 215   *pdwCookie = entry->cookie;
 216
 217   LeaveCriticalSection(&git_section);
 218
 219   TRACE("Cookie is 0x%x\n", entry->cookie);
 220   return S_OK;
 221 }
 222
 223 static HRESULT WINAPI
 224 StdGlobalInterfaceTable_RevokeInterfaceFromGlobal(
 225                IGlobalInterfaceTable* iface, DWORD dwCookie)
 226 {
 227   StdGITEntry* entry;
 228   HRESULT hr;
 229
 230   TRACE("iface=%p, dwCookie=0x%x\n", iface, (UINT)dwCookie);
 231
 232   EnterCriticalSection(&git_section);
 233
 234   entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
 235   if (entry == NULL) {
 236     TRACE("Entry not found\n");
 237     LeaveCriticalSection(&git_section);
 238     return E_INVALIDARG; /* not found */
 239   }
 240
 241   list_remove(&entry->entry);
 242
 243   LeaveCriticalSection(&git_section);
 244
 245   /* Free the stream */
 246   hr = CoReleaseMarshalData(entry->stream);
 247   if (hr != S_OK)
 248   {
 249     WARN("Failed to release marshal data, hr = 0x%08x\n", hr);
 250     return hr;
 251   }
 252   IStream_Release(entry->stream);
 253
 254   HeapFree(GetProcessHeap(), 0, entry);
 255   return S_OK;
 256 }
 257
 258 static HRESULT WINAPI
 259 StdGlobalInterfaceTable_GetInterfaceFromGlobal(
 260                IGlobalInterfaceTable* iface, DWORD dwCookie,
 261                REFIID riid, void **ppv)
 262 {
 263   StdGITEntry* entry;
 264   HRESULT hres;
 265   IStream *stream;
 266
 267   TRACE("dwCookie=0x%x, riid=%s, ppv=%p\n", dwCookie, debugstr_guid(riid), ppv);
 268
 269   EnterCriticalSection(&git_section);
 270
 271   entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
 272   if (entry == NULL) {
 273     WARN("Entry for cookie 0x%x not found\n", dwCookie);
 274     LeaveCriticalSection(&git_section);
 275     return E_INVALIDARG;
 276   }
 277
 278   TRACE("entry=%p\n", entry);
 279
 280   hres = IStream_Clone(entry->stream, &stream);
 281
 282   LeaveCriticalSection(&git_section);
 283
 284   if (hres) {
 285     WARN("Failed to clone stream with error 0x%08x\n", hres);
 286     return hres;
 287   }
 288
 289   /* unmarshal the interface */
 290   hres = CoUnmarshalInterface(stream, riid, ppv);
 291   IStream_Release(stream);
 292
 293   if (hres) {
 294     WARN("Failed to unmarshal stream\n");
 295     return hres;
 296   }
 297
 298   TRACE("ppv=%p\n", *ppv);
 299   return S_OK;
 300 }
 301
 302 /* Classfactory definition - despite what MSDN says, some programs need this */
 303
 304 static HRESULT WINAPI
 305 GITCF_QueryInterface(LPCLASSFACTORY iface,REFIID riid, LPVOID *ppv)
 306 {
 307   *ppv = NULL;
 308   if (IsEqualIID(riid,&IID_IUnknown) ||
 309       IsEqualIID(riid,&IID_IGlobalInterfaceTable))
 310   {
 311     *ppv = (LPVOID)iface;
 312     return S_OK;
 313   }
 314   return E_NOINTERFACE;
 315 }
 316
 317 static ULONG WINAPI GITCF_AddRef(LPCLASSFACTORY iface)
 318 {
 319   return 2;
 320 }
 321
 322 static ULONG WINAPI GITCF_Release(LPCLASSFACTORY iface)
 323 {
 324   return 1;
 325 }
 326
 327 static HRESULT WINAPI
 328 GITCF_CreateInstance(LPCLASSFACTORY iface, LPUNKNOWN pUnk,
 329                      REFIID riid, LPVOID *ppv)
 330 {
 331   if (IsEqualIID(riid,&IID_IGlobalInterfaceTable)) {
 332     if (StdGlobalInterfaceTableInstance == NULL)
 333       StdGlobalInterfaceTableInstance = StdGlobalInterfaceTable_Construct();
 334     return IGlobalInterfaceTable_QueryInterface( (IGlobalInterfaceTable*) StdGlobalInterfaceTableInstance, riid, ppv);
 335   }
 336
 337   FIXME("(%s), not supported.\n",debugstr_guid(riid));
 338   return E_NOINTERFACE;
 339 }
 340
 341 static HRESULT WINAPI GITCF_LockServer(LPCLASSFACTORY iface, BOOL fLock)
 342 {
 343     FIXME("(%d), stub!\n",fLock);
 344     return S_OK;
 345 }
 346
 347 static const IClassFactoryVtbl GITClassFactoryVtbl = {
 348     GITCF_QueryInterface,
 349     GITCF_AddRef,
 350     GITCF_Release,
 351     GITCF_CreateInstance,
 352     GITCF_LockServer
 353 };
 354
 355 static const IClassFactoryVtbl *PGITClassFactoryVtbl = &GITClassFactoryVtbl;
 356
 357 HRESULT StdGlobalInterfaceTable_GetFactory(LPVOID *ppv)
 358 {
 359   *ppv = &PGITClassFactoryVtbl;
 360   TRACE("Returning GIT classfactory\n");
 361   return S_OK;
 362 }
 363
 364 /* Virtual function table */
 365 static const IGlobalInterfaceTableVtbl StdGlobalInterfaceTableImpl_Vtbl =
 366 {
 367   StdGlobalInterfaceTable_QueryInterface,
 368   StdGlobalInterfaceTable_AddRef,
 369   StdGlobalInterfaceTable_Release,
 370   StdGlobalInterfaceTable_RegisterInterfaceInGlobal,
 371   StdGlobalInterfaceTable_RevokeInterfaceFromGlobal,
 372   StdGlobalInterfaceTable_GetInterfaceFromGlobal
 373 };
 374
 375 /** This function constructs the GIT. It should only be called once **/
 376 void* StdGlobalInterfaceTable_Construct(void)
 377 {
 378   StdGlobalInterfaceTableImpl* newGIT;
 379
 380   newGIT = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGlobalInterfaceTableImpl));
 381   if (newGIT == 0) return newGIT;
 382
 383   newGIT->lpVtbl = &StdGlobalInterfaceTableImpl_Vtbl;
 384   newGIT->ref = 1;      /* Initialise the reference count */
 385   list_init(&newGIT->list);
 386   newGIT->nextCookie = 0xf100; /* that's where windows starts, so that's where we start */
 387   TRACE("Created the GIT at %p\n", newGIT);
 388
 389   return (void*)newGIT;
 390 }