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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include "config.h"
  28
  29 #include <assert.h>
  30 #include <stdlib.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34
  35 #define COBJMACROS
  36 #define NONAMELESSUNION
  37 #define NONAMELESSSTRUCT
  38
  39 #include "windef.h"
  40 #include "winbase.h"
  41 #include "winuser.h"
  42 #include "objbase.h"
  43 #include "ole2.h"
  44 #include "winerror.h"
  45 #include "winreg.h"
  46 #include "winternl.h"
  47
  48 #include "compobj_private.h"
  49
  50 #include "wine/debug.h"
  51
  52 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  53
  54 /****************************************************************************
  55  * StdGlobalInterfaceTable definition
  56  *
  57  * This class implements IGlobalInterfaceTable and is a process-wide singleton
  58  * used for marshalling interfaces between threading apartments using cookies.
  59  */
  60
  61 /* Each entry in the linked list of GIT entries */
  62 typedef struct StdGITEntry
  63 {
  64   DWORD cookie;
  65   IID iid;         /* IID of the interface */
  66   IStream* stream; /* Holds the marshalled interface */
  67
  68   struct StdGITEntry* next;
  69   struct StdGITEntry* prev;
  70 } StdGITEntry;
  71
  72 /* Class data */
  73 typedef struct StdGlobalInterfaceTableImpl
  74 {
  75   IGlobalInterfaceTableVtbl *lpVtbl;
  76
  77   ULONG ref;
  78   struct StdGITEntry* firstEntry;
  79   struct StdGITEntry* lastEntry;
  80   ULONG nextCookie;
  81
  82 } StdGlobalInterfaceTableImpl;
  83
  84 void* StdGlobalInterfaceTableInstance;
  85
  86 static CRITICAL_SECTION git_section;
  87 static CRITICAL_SECTION_DEBUG critsect_debug =
  88 {
  89     0, 0, &git_section,
  90     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  91       0, 0, { 0, (DWORD)(__FILE__ ": global interface table") }
  92 };
  93 static CRITICAL_SECTION git_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  94
  95
  96 /** This destroys it again. It should revoke all the held interfaces first **/
  97 void StdGlobalInterfaceTable_Destroy(void* self) {
  98   TRACE("(%p)\n", self);
  99   FIXME("Revoke held interfaces here\n");
 100
 101   HeapFree(GetProcessHeap(), 0, self);
 102   StdGlobalInterfaceTableInstance = NULL;
 103 }
 104
 105 /***
 106  * A helper function to traverse the list and find the entry that matches the cookie.
 107  * Returns NULL if not found
 108  */
 109 static StdGITEntry*
 110 StdGlobalInterfaceTable_FindEntry(IGlobalInterfaceTable* iface, DWORD cookie)
 111 {
 112   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 113   StdGITEntry* e;
 114
 115   TRACE("iface=%p, cookie=0x%x\n", iface, (UINT)cookie);
 116
 117   EnterCriticalSection(&git_section);
 118   e = self->firstEntry;
 119   while (e != NULL) {
 120     if (e->cookie == cookie) {
 121       LeaveCriticalSection(&git_section);
 122       return e;
 123     }
 124     e = e->next;
 125   }
 126   LeaveCriticalSection(&git_section);
 127
 128   TRACE("Entry not found\n");
 129   return NULL;
 130 }
 131
 132 /***
 133  * Here's the boring boilerplate stuff for IUnknown
 134  */
 135
 136 static HRESULT WINAPI
 137 StdGlobalInterfaceTable_QueryInterface(IGlobalInterfaceTable* iface,
 138                REFIID riid, void** ppvObject)
 139 {
 140   /* Make sure silly coders can't crash us */
 141   if (ppvObject == 0) return E_INVALIDARG;
 142
 143   *ppvObject = 0; /* assume we don't have the interface */
 144
 145   /* Do we implement that interface? */
 146   if (IsEqualIID(&IID_IUnknown, riid) ||
 147       IsEqualIID(&IID_IGlobalInterfaceTable, riid))
 148     *ppvObject = iface;
 149   else
 150     return E_NOINTERFACE;
 151
 152   /* Now inc the refcount */
 153   IGlobalInterfaceTable_AddRef(iface);
 154   return S_OK;
 155 }
 156
 157 static ULONG WINAPI
 158 StdGlobalInterfaceTable_AddRef(IGlobalInterfaceTable* iface)
 159 {
 160   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 161
 162   /* InterlockedIncrement(&self->ref); */
 163   return self->ref;
 164 }
 165
 166 static ULONG WINAPI
 167 StdGlobalInterfaceTable_Release(IGlobalInterfaceTable* iface)
 168 {
 169   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 170
 171   /* InterlockedDecrement(&self->ref); */
 172   if (self->ref == 0) {
 173     /* Hey ho, it's time to go, so long again 'till next weeks show! */
 174     StdGlobalInterfaceTable_Destroy(self);
 175     return 0;
 176   }
 177
 178   return self->ref;
 179 }
 180
 181 /***
 182  * Now implement the actual IGlobalInterfaceTable interface
 183  */
 184
 185 static HRESULT WINAPI
 186 StdGlobalInterfaceTable_RegisterInterfaceInGlobal(
 187                IGlobalInterfaceTable* iface, IUnknown* pUnk,
 188                REFIID riid, DWORD* pdwCookie)
 189 {
 190   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 191   IStream* stream = NULL;
 192   HRESULT hres;
 193   StdGITEntry* entry;
 194   LARGE_INTEGER zero;
 195
 196   TRACE("iface=%p, pUnk=%p, riid=%s, pdwCookie=0x%p\n", iface, pUnk, debugstr_guid(riid), pdwCookie);
 197
 198   if (pUnk == NULL) return E_INVALIDARG;
 199
 200   /* marshal the interface */
 201   TRACE("About to marshal the interface\n");
 202
 203   hres = CreateStreamOnHGlobal(0, TRUE, &stream);
 204   if (hres) return hres;
 205   hres = CoMarshalInterface(stream, riid, pUnk, MSHCTX_INPROC, NULL, MSHLFLAGS_TABLESTRONG);
 206   if (hres)
 207   {
 208     IStream_Release(stream);
 209     return hres;
 210   }
 211
 212   zero.QuadPart = 0;
 213   IStream_Seek(stream, zero, SEEK_SET, NULL);
 214
 215   entry = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGITEntry));
 216   if (entry == NULL) return E_OUTOFMEMORY;
 217
 218   EnterCriticalSection(&git_section);
 219
 220   entry->iid = *riid;
 221   entry->stream = stream;
 222   entry->cookie = self->nextCookie;
 223   self->nextCookie++; /* inc the cookie count */
 224
 225   /* insert the new entry at the end of the list */
 226   entry->next = NULL;
 227   entry->prev = self->lastEntry;
 228   if (entry->prev) entry->prev->next = entry;
 229   else self->firstEntry = entry;
 230   self->lastEntry = entry;
 231
 232   /* and return the cookie */
 233   *pdwCookie = entry->cookie;
 234
 235   LeaveCriticalSection(&git_section);
 236
 237   TRACE("Cookie is 0x%lx\n", entry->cookie);
 238   return S_OK;
 239 }
 240
 241 static HRESULT WINAPI
 242 StdGlobalInterfaceTable_RevokeInterfaceFromGlobal(
 243                IGlobalInterfaceTable* iface, DWORD dwCookie)
 244 {
 245   StdGlobalInterfaceTableImpl* const self = (StdGlobalInterfaceTableImpl*) iface;
 246   StdGITEntry* entry;
 247   HRESULT hr;
 248
 249   TRACE("iface=%p, dwCookie=0x%x\n", iface, (UINT)dwCookie);
 250
 251   entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
 252   if (entry == NULL) {
 253     TRACE("Entry not found\n");
 254     return E_INVALIDARG; /* not found */
 255   }
 256
 257   /* Free the stream */
 258   hr = CoReleaseMarshalData(entry->stream);
 259   if (hr != S_OK)
 260   {
 261     WARN("Failed to release marshal data, hr = 0x%08lx\n", hr);
 262     return hr;
 263   }
 264   IStream_Release(entry->stream);
 265
 266   /* chop entry out of the list, and free the memory */
 267   EnterCriticalSection(&git_section);
 268   if (entry->prev) entry->prev->next = entry->next;
 269   else self->firstEntry = entry->next;
 270   if (entry->next) entry->next->prev = entry->prev;
 271   else self->lastEntry = entry->prev;
 272   LeaveCriticalSection(&git_section);
 273
 274   HeapFree(GetProcessHeap(), 0, entry);
 275   return S_OK;
 276 }
 277
 278 static HRESULT WINAPI
 279 StdGlobalInterfaceTable_GetInterfaceFromGlobal(
 280                IGlobalInterfaceTable* iface, DWORD dwCookie,
 281                REFIID riid, void **ppv)
 282 {
 283   StdGITEntry* entry;
 284   HRESULT hres;
 285   LARGE_INTEGER move;
 286   LPUNKNOWN lpUnk;
 287
 288   TRACE("dwCookie=0x%lx, riid=%s, ppv=%p\n", dwCookie, debugstr_guid(riid), ppv);
 289
 290   entry = StdGlobalInterfaceTable_FindEntry(iface, dwCookie);
 291   if (entry == NULL) return E_INVALIDARG;
 292
 293   if (!IsEqualIID(&entry->iid, riid)) {
 294     WARN("entry->iid (%s) != riid\n", debugstr_guid(&entry->iid));
 295     return E_INVALIDARG;
 296   }
 297   TRACE("entry=%p\n", entry);
 298
 299   /* unmarshal the interface */
 300   hres = CoUnmarshalInterface(entry->stream, riid, ppv);
 301   if (hres) {
 302     WARN("Failed to unmarshal stream\n");
 303     return hres;
 304   }
 305
 306   /* rewind stream, in case it's used again */
 307   move.u.LowPart = 0;
 308   move.u.HighPart = 0;
 309   IStream_Seek(entry->stream, move, STREAM_SEEK_SET, NULL);
 310
 311   /* addref it */
 312   lpUnk = *ppv;
 313   IUnknown_AddRef(lpUnk);
 314   TRACE("ppv=%p\n", *ppv);
 315   return S_OK;
 316 }
 317
 318 /* Classfactory definition - despite what MSDN says, some programs need this */
 319
 320 static HRESULT WINAPI
 321 GITCF_QueryInterface(LPCLASSFACTORY iface,REFIID riid, LPVOID *ppv)
 322 {
 323   *ppv = NULL;
 324   if (IsEqualIID(riid,&IID_IUnknown) ||
 325       IsEqualIID(riid,&IID_IGlobalInterfaceTable))
 326   {
 327     *ppv = (LPVOID)iface;
 328     return S_OK;
 329   }
 330   return E_NOINTERFACE;
 331 }
 332
 333 static ULONG WINAPI GITCF_AddRef(LPCLASSFACTORY iface)
 334 {
 335   return 2;
 336 }
 337
 338 static ULONG WINAPI GITCF_Release(LPCLASSFACTORY iface)
 339 {
 340   return 1;
 341 }
 342
 343 static HRESULT WINAPI
 344 GITCF_CreateInstance(LPCLASSFACTORY iface, LPUNKNOWN pUnk,
 345                      REFIID riid, LPVOID *ppv)
 346 {
 347   if (IsEqualIID(riid,&IID_IGlobalInterfaceTable)) {
 348     if (StdGlobalInterfaceTableInstance == NULL)
 349       StdGlobalInterfaceTableInstance = StdGlobalInterfaceTable_Construct();
 350     return IGlobalInterfaceTable_QueryInterface( (IGlobalInterfaceTable*) StdGlobalInterfaceTableInstance, riid, ppv);
 351   }
 352
 353   FIXME("(%s), not supported.\n",debugstr_guid(riid));
 354   return E_NOINTERFACE;
 355 }
 356
 357 static HRESULT WINAPI GITCF_LockServer(LPCLASSFACTORY iface, BOOL fLock)
 358 {
 359     FIXME("(%d), stub!\n",fLock);
 360     return S_OK;
 361 }
 362
 363 static IClassFactoryVtbl GITClassFactoryVtbl = {
 364     GITCF_QueryInterface,
 365     GITCF_AddRef,
 366     GITCF_Release,
 367     GITCF_CreateInstance,
 368     GITCF_LockServer
 369 };
 370
 371 static IClassFactoryVtbl *PGITClassFactoryVtbl = &GITClassFactoryVtbl;
 372
 373 HRESULT StdGlobalInterfaceTable_GetFactory(LPVOID *ppv)
 374 {
 375   *ppv = &PGITClassFactoryVtbl;
 376   TRACE("Returning GIT classfactory\n");
 377   return S_OK;
 378 }
 379
 380 /* Virtual function table */
 381 static IGlobalInterfaceTableVtbl StdGlobalInterfaceTableImpl_Vtbl =
 382 {
 383   StdGlobalInterfaceTable_QueryInterface,
 384   StdGlobalInterfaceTable_AddRef,
 385   StdGlobalInterfaceTable_Release,
 386   StdGlobalInterfaceTable_RegisterInterfaceInGlobal,
 387   StdGlobalInterfaceTable_RevokeInterfaceFromGlobal,
 388   StdGlobalInterfaceTable_GetInterfaceFromGlobal
 389 };
 390
 391 /** This function constructs the GIT. It should only be called once **/
 392 void* StdGlobalInterfaceTable_Construct()
 393 {
 394   StdGlobalInterfaceTableImpl* newGIT;
 395
 396   newGIT = HeapAlloc(GetProcessHeap(), 0, sizeof(StdGlobalInterfaceTableImpl));
 397   if (newGIT == 0) return newGIT;
 398
 399   newGIT->lpVtbl = &StdGlobalInterfaceTableImpl_Vtbl;
 400   newGIT->ref = 1;      /* Initialise the reference count */
 401   newGIT->firstEntry = NULL; /* we start with an empty table   */
 402   newGIT->lastEntry  = NULL;
 403   newGIT->nextCookie = 0xf100; /* that's where windows starts, so that's where we start */
 404   TRACE("Created the GIT at %p\n", newGIT);
 405
 406   return (void*)newGIT;
 407 }