dlls/ole32/datacache.c

   1 /*
   2  *      OLE 2 Data cache
   3  *
   4  *      Copyright 1999  Francis Beaudet
   5  *      Copyright 2000  Abey George
   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  * NOTES:
  22  *    The OLE2 data cache supports a whole whack of
  23  *    interfaces including:
  24  *       IDataObject, IPersistStorage, IViewObject2,
  25  *       IOleCache2 and IOleCacheControl.
  26  *
  27  *    Most of the implementation details are taken from: Inside OLE
  28  *    second edition by Kraig Brockschmidt,
  29  *
  30  * NOTES
  31  *  -  This implementation of the datacache will let your application
  32  *     load documents that have embedded OLE objects in them and it will
  33  *     also retrieve the metafile representation of those objects.
  34  *  -  This implementation of the datacache will also allow your
  35  *     application to save new documents with OLE objects in them.
  36  *  -  The main thing that it doesn't do is allow you to activate
  37  *     or modify the OLE objects in any way.
  38  *  -  I haven't found any good documentation on the real usage of
  39  *     the streams created by the data cache. In particular, How to
  40  *     determine what the XXX stands for in the stream name
  41  *     "\002OlePresXXX". It appears to just be a counter.
  42  *  -  Also, I don't know the real content of the presentation stream
  43  *     header. I was able to figure-out where the extent of the object
  44  *     was stored and the aspect, but that's about it.
  45  */
  46 #include <stdarg.h>
  47 #include <string.h>
  48
  49 #define COBJMACROS
  50 #define NONAMELESSUNION
  51 #define NONAMELESSSTRUCT
  52
  53 #include "windef.h"
  54 #include "winbase.h"
  55 #include "wingdi.h"
  56 #include "winuser.h"
  57 #include "winerror.h"
  58 #include "wine/unicode.h"
  59 #include "ole2.h"
  60 #include "wine/list.h"
  61 #include "wine/debug.h"
  62
  63 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  64
  65 /****************************************************************************
  66  * PresentationDataHeader
  67  *
  68  * This structure represents the header of the \002OlePresXXX stream in
  69  * the OLE object storage.
  70  */
  71 typedef struct PresentationDataHeader
  72 {
  73   /* clipformat:
  74    *  - standard clipformat:
  75    *  DWORD length = 0xffffffff;
  76    *  DWORD cfFormat;
  77    *  - or custom clipformat:
  78    *  DWORD length;
  79    *  CHAR format_name[length]; (null-terminated)
  80    */
  81   DWORD unknown3;       /* 4, possibly TYMED_ISTREAM */
  82   DVASPECT dvAspect;
  83   DWORD lindex;
  84   DWORD tymed;
  85   DWORD unknown7;       /* 0 */
  86   DWORD dwObjectExtentX;
  87   DWORD dwObjectExtentY;
  88   DWORD dwSize;
  89 } PresentationDataHeader;
  90
  91 typedef struct DataCacheEntry
  92 {
  93   struct list entry;
  94   /* format of this entry */
  95   FORMATETC fmtetc;
  96   /* the clipboard format of the data */
  97   CLIPFORMAT data_cf;
  98   /* cached data */
  99   STGMEDIUM stgmedium;
 100   /*
 101    * This storage pointer is set through a call to
 102    * IPersistStorage_Load. This is where the visual
 103    * representation of the object is stored.
 104    */
 105   IStorage *storage;
 106   /* connection ID */
 107   DWORD id;
 108   /* dirty flag */
 109   BOOL dirty;
 110   /* stream number (-1 if not set ) */
 111   unsigned short stream_number;
 112   /* sink id set when object is running */
 113   DWORD sink_id;
 114   /* Advise sink flags */
 115   DWORD advise_flags;
 116 } DataCacheEntry;
 117
 118 /****************************************************************************
 119  * DataCache
 120  */
 121 struct DataCache
 122 {
 123   /*
 124    * List all interface here
 125    */
 126   IDataObject       IDataObject_iface;
 127   IUnknown          IUnknown_iface;
 128   IPersistStorage   IPersistStorage_iface;
 129   IViewObject2      IViewObject2_iface;
 130   IOleCache2        IOleCache2_iface;
 131   IOleCacheControl  IOleCacheControl_iface;
 132
 133   /* The sink that is connected to a remote object.
 134      The other interfaces are not available by QI'ing the sink and vice-versa */
 135   IAdviseSink       IAdviseSink_iface;
 136
 137   /*
 138    * Reference count of this object
 139    */
 140   LONG ref;
 141
 142   /*
 143    * IUnknown implementation of the outer object.
 144    */
 145   IUnknown* outerUnknown;
 146
 147   /*
 148    * The user of this object can setup ONE advise sink
 149    * connection with the object. These parameters describe
 150    * that connection.
 151    */
 152   DWORD        sinkAspects;
 153   DWORD        sinkAdviseFlag;
 154   IAdviseSink* sinkInterface;
 155   IStorage *presentationStorage;
 156
 157   /* list of cache entries */
 158   struct list cache_list;
 159   /* last id assigned to an entry */
 160   DWORD last_cache_id;
 161   /* dirty flag */
 162   BOOL dirty;
 163   /* running object set by OnRun */
 164   IDataObject *running_object;
 165 };
 166
 167 typedef struct DataCache DataCache;
 168
 169 /*
 170  * Here, I define utility macros to help with the casting of the
 171  * "this" parameter.
 172  * There is a version to accommodate all of the VTables implemented
 173  * by this object.
 174  */
 175
 176 static inline DataCache *impl_from_IDataObject( IDataObject *iface )
 177 {
 178     return CONTAINING_RECORD(iface, DataCache, IDataObject_iface);
 179 }
 180
 181 static inline DataCache *impl_from_IUnknown( IUnknown *iface )
 182 {
 183     return CONTAINING_RECORD(iface, DataCache, IUnknown_iface);
 184 }
 185
 186 static inline DataCache *impl_from_IPersistStorage( IPersistStorage *iface )
 187 {
 188     return CONTAINING_RECORD(iface, DataCache, IPersistStorage_iface);
 189 }
 190
 191 static inline DataCache *impl_from_IViewObject2( IViewObject2 *iface )
 192 {
 193     return CONTAINING_RECORD(iface, DataCache, IViewObject2_iface);
 194 }
 195
 196 static inline DataCache *impl_from_IOleCache2( IOleCache2 *iface )
 197 {
 198     return CONTAINING_RECORD(iface, DataCache, IOleCache2_iface);
 199 }
 200
 201 static inline DataCache *impl_from_IOleCacheControl( IOleCacheControl *iface )
 202 {
 203     return CONTAINING_RECORD(iface, DataCache, IOleCacheControl_iface);
 204 }
 205
 206 static inline DataCache *impl_from_IAdviseSink( IAdviseSink *iface )
 207 {
 208     return CONTAINING_RECORD(iface, DataCache, IAdviseSink_iface);
 209 }
 210
 211 static const char * debugstr_formatetc(const FORMATETC *formatetc)
 212 {
 213     return wine_dbg_sprintf("{ cfFormat = 0x%x, ptd = %p, dwAspect = %d, lindex = %d, tymed = %d }",
 214         formatetc->cfFormat, formatetc->ptd, formatetc->dwAspect,
 215         formatetc->lindex, formatetc->tymed);
 216 }
 217
 218 static void DataCacheEntry_Destroy(DataCache *cache, DataCacheEntry *cache_entry)
 219 {
 220     list_remove(&cache_entry->entry);
 221     if (cache_entry->storage)
 222         IStorage_Release(cache_entry->storage);
 223     HeapFree(GetProcessHeap(), 0, cache_entry->fmtetc.ptd);
 224     ReleaseStgMedium(&cache_entry->stgmedium);
 225     if(cache_entry->sink_id)
 226         IDataObject_DUnadvise(cache->running_object, cache_entry->sink_id);
 227
 228     HeapFree(GetProcessHeap(), 0, cache_entry);
 229 }
 230
 231 static void DataCache_Destroy(
 232   DataCache* ptrToDestroy)
 233 {
 234   DataCacheEntry *cache_entry, *next_cache_entry;
 235
 236   TRACE("()\n");
 237
 238   if (ptrToDestroy->sinkInterface != NULL)
 239   {
 240     IAdviseSink_Release(ptrToDestroy->sinkInterface);
 241     ptrToDestroy->sinkInterface = NULL;
 242   }
 243
 244   LIST_FOR_EACH_ENTRY_SAFE(cache_entry, next_cache_entry, &ptrToDestroy->cache_list, DataCacheEntry, entry)
 245     DataCacheEntry_Destroy(ptrToDestroy, cache_entry);
 246
 247   if (ptrToDestroy->presentationStorage != NULL)
 248   {
 249     IStorage_Release(ptrToDestroy->presentationStorage);
 250     ptrToDestroy->presentationStorage = NULL;
 251   }
 252
 253   /*
 254    * Free the datacache pointer.
 255    */
 256   HeapFree(GetProcessHeap(), 0, ptrToDestroy);
 257 }
 258
 259 static DataCacheEntry *DataCache_GetEntryForFormatEtc(DataCache *This, const FORMATETC *formatetc)
 260 {
 261     DataCacheEntry *cache_entry;
 262     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
 263     {
 264         /* FIXME: also compare DVTARGETDEVICEs */
 265         if ((!cache_entry->fmtetc.cfFormat || !formatetc->cfFormat || (formatetc->cfFormat == cache_entry->fmtetc.cfFormat)) &&
 266             (formatetc->dwAspect == cache_entry->fmtetc.dwAspect) &&
 267             (formatetc->lindex == cache_entry->fmtetc.lindex) &&
 268             (!cache_entry->fmtetc.tymed || !formatetc->tymed || (formatetc->tymed == cache_entry->fmtetc.tymed)))
 269             return cache_entry;
 270     }
 271     return NULL;
 272 }
 273
 274 /* checks that the clipformat and tymed are valid and returns an error if they
 275 * aren't and CACHE_S_NOTSUPPORTED if they are valid, but can't be rendered by
 276 * DataCache_Draw */
 277 static HRESULT check_valid_clipformat_and_tymed(CLIPFORMAT cfFormat, DWORD tymed)
 278 {
 279     if (!cfFormat || !tymed ||
 280         (cfFormat == CF_METAFILEPICT && tymed == TYMED_MFPICT) ||
 281         (cfFormat == CF_BITMAP && tymed == TYMED_GDI) ||
 282         (cfFormat == CF_DIB && tymed == TYMED_HGLOBAL) ||
 283         (cfFormat == CF_ENHMETAFILE && tymed == TYMED_ENHMF))
 284         return S_OK;
 285     else if (tymed == TYMED_HGLOBAL)
 286         return CACHE_S_FORMATETC_NOTSUPPORTED;
 287     else
 288     {
 289         WARN("invalid clipformat/tymed combination: %d/%d\n", cfFormat, tymed);
 290         return DV_E_TYMED;
 291     }
 292 }
 293
 294 static HRESULT DataCache_CreateEntry(DataCache *This, const FORMATETC *formatetc, DataCacheEntry **cache_entry)
 295 {
 296     HRESULT hr;
 297
 298     hr = check_valid_clipformat_and_tymed(formatetc->cfFormat, formatetc->tymed);
 299     if (FAILED(hr))
 300         return hr;
 301     if (hr == CACHE_S_FORMATETC_NOTSUPPORTED)
 302         TRACE("creating unsupported format %d\n", formatetc->cfFormat);
 303
 304     *cache_entry = HeapAlloc(GetProcessHeap(), 0, sizeof(**cache_entry));
 305     if (!*cache_entry)
 306         return E_OUTOFMEMORY;
 307
 308     (*cache_entry)->fmtetc = *formatetc;
 309     if (formatetc->ptd)
 310     {
 311         (*cache_entry)->fmtetc.ptd = HeapAlloc(GetProcessHeap(), 0, formatetc->ptd->tdSize);
 312         memcpy((*cache_entry)->fmtetc.ptd, formatetc->ptd, formatetc->ptd->tdSize);
 313     }
 314     (*cache_entry)->data_cf = 0;
 315     (*cache_entry)->stgmedium.tymed = TYMED_NULL;
 316     (*cache_entry)->stgmedium.pUnkForRelease = NULL;
 317     (*cache_entry)->storage = NULL;
 318     (*cache_entry)->id = This->last_cache_id++;
 319     (*cache_entry)->dirty = TRUE;
 320     (*cache_entry)->stream_number = -1;
 321     (*cache_entry)->sink_id = 0;
 322     (*cache_entry)->advise_flags = 0;
 323     list_add_tail(&This->cache_list, &(*cache_entry)->entry);
 324     return hr;
 325 }
 326
 327 /************************************************************************
 328  * DataCache_FireOnViewChange
 329  *
 330  * This method will fire an OnViewChange notification to the advise
 331  * sink registered with the datacache.
 332  *
 333  * See IAdviseSink::OnViewChange for more details.
 334  */
 335 static void DataCache_FireOnViewChange(
 336   DataCache* this,
 337   DWORD      aspect,
 338   LONG       lindex)
 339 {
 340   TRACE("(%p, %x, %d)\n", this, aspect, lindex);
 341
 342   /*
 343    * The sink supplies a filter when it registers
 344    * we make sure we only send the notifications when that
 345    * filter matches.
 346    */
 347   if ((this->sinkAspects & aspect) != 0)
 348   {
 349     if (this->sinkInterface != NULL)
 350     {
 351       IAdviseSink_OnViewChange(this->sinkInterface,
 352                                aspect,
 353                                lindex);
 354
 355       /*
 356        * Some sinks want to be unregistered automatically when
 357        * the first notification goes out.
 358        */
 359       if ( (this->sinkAdviseFlag & ADVF_ONLYONCE) != 0)
 360       {
 361         IAdviseSink_Release(this->sinkInterface);
 362
 363         this->sinkInterface  = NULL;
 364         this->sinkAspects    = 0;
 365         this->sinkAdviseFlag = 0;
 366       }
 367     }
 368   }
 369 }
 370
 371 /* Helper for DataCacheEntry_OpenPresStream */
 372 static BOOL DataCache_IsPresentationStream(const STATSTG *elem)
 373 {
 374     /* The presentation streams have names of the form "\002OlePresXXX",
 375      * where XXX goes from 000 to 999. */
 376     static const WCHAR OlePres[] = { 2,'O','l','e','P','r','e','s' };
 377
 378     LPCWSTR name = elem->pwcsName;
 379
 380     return (elem->type == STGTY_STREAM)
 381         && (strlenW(name) == 11)
 382         && (strncmpW(name, OlePres, 8) == 0)
 383         && (name[8] >= '0') && (name[8] <= '9')
 384         && (name[9] >= '0') && (name[9] <= '9')
 385         && (name[10] >= '0') && (name[10] <= '9');
 386 }
 387
 388 static HRESULT read_clipformat(IStream *stream, CLIPFORMAT *clipformat)
 389 {
 390     DWORD length;
 391     HRESULT hr;
 392     ULONG read;
 393
 394     *clipformat = 0;
 395
 396     hr = IStream_Read(stream, &length, sizeof(length), &read);
 397     if (hr != S_OK || read != sizeof(length))
 398         return DV_E_CLIPFORMAT;
 399     if (length == -1)
 400     {
 401         DWORD cf;
 402         hr = IStream_Read(stream, &cf, sizeof(cf), 0);
 403         if (hr != S_OK || read != sizeof(cf))
 404             return DV_E_CLIPFORMAT;
 405         *clipformat = cf;
 406     }
 407     else
 408     {
 409         char *format_name = HeapAlloc(GetProcessHeap(), 0, length);
 410         if (!format_name)
 411             return E_OUTOFMEMORY;
 412         hr = IStream_Read(stream, format_name, length, &read);
 413         if (hr != S_OK || read != length || format_name[length - 1] != '\0')
 414         {
 415             HeapFree(GetProcessHeap(), 0, format_name);
 416             return DV_E_CLIPFORMAT;
 417         }
 418         *clipformat = RegisterClipboardFormatA(format_name);
 419         HeapFree(GetProcessHeap(), 0, format_name);
 420     }
 421     return S_OK;
 422 }
 423
 424 static HRESULT write_clipformat(IStream *stream, CLIPFORMAT clipformat)
 425 {
 426     DWORD length;
 427     HRESULT hr;
 428
 429     if (clipformat < 0xc000)
 430         length = -1;
 431     else
 432         length = GetClipboardFormatNameA(clipformat, NULL, 0);
 433     hr = IStream_Write(stream, &length, sizeof(length), NULL);
 434     if (FAILED(hr))
 435         return hr;
 436     if (clipformat < 0xc000)
 437     {
 438         DWORD cf = clipformat;
 439         hr = IStream_Write(stream, &cf, sizeof(cf), NULL);
 440     }
 441     else
 442     {
 443         char *format_name = HeapAlloc(GetProcessHeap(), 0, length);
 444         if (!format_name)
 445             return E_OUTOFMEMORY;
 446         GetClipboardFormatNameA(clipformat, format_name, length);
 447         hr = IStream_Write(stream, format_name, length, NULL);
 448         HeapFree(GetProcessHeap(), 0, format_name);
 449     }
 450     return hr;
 451 }
 452
 453 /************************************************************************
 454  * DataCacheEntry_OpenPresStream
 455  *
 456  * This method will find the stream for the given presentation. It makes
 457  * no attempt at fallback.
 458  *
 459  * Param:
 460  *   this       - Pointer to the DataCache object
 461  *   drawAspect - The aspect of the object that we wish to draw.
 462  *   pStm       - A returned stream. It points to the beginning of the
 463  *              - presentation data, including the header.
 464  *
 465  * Errors:
 466  *   S_OK               The requested stream has been opened.
 467  *   OLE_E_BLANK        The requested stream could not be found.
 468  *   Quite a few others I'm too lazy to map correctly.
 469  *
 470  * Notes:
 471  *   Algorithm: Scan the elements of the presentation storage, looking
 472  *              for presentation streams. For each presentation stream,
 473  *              load the header and check to see if the aspect matches.
 474  *
 475  *   If a fallback is desired, just opening the first presentation stream
 476  *   is a possibility.
 477  */
 478 static HRESULT DataCacheEntry_OpenPresStream(DataCacheEntry *cache_entry, IStream **ppStm)
 479 {
 480     STATSTG elem;
 481     IEnumSTATSTG *pEnum;
 482     HRESULT hr;
 483
 484     if (!ppStm) return E_POINTER;
 485
 486     hr = IStorage_EnumElements(cache_entry->storage, 0, NULL, 0, &pEnum);
 487     if (FAILED(hr)) return hr;
 488
 489     while ((hr = IEnumSTATSTG_Next(pEnum, 1, &elem, NULL)) == S_OK)
 490     {
 491         if (DataCache_IsPresentationStream(&elem))
 492         {
 493             IStream *pStm;
 494
 495             hr = IStorage_OpenStream(cache_entry->storage, elem.pwcsName,
 496                                      NULL, STGM_READ | STGM_SHARE_EXCLUSIVE, 0,
 497                                      &pStm);
 498             if (SUCCEEDED(hr))
 499             {
 500                 PresentationDataHeader header;
 501                 ULONG actual_read;
 502                 CLIPFORMAT clipformat;
 503
 504                 hr = read_clipformat(pStm, &clipformat);
 505
 506                 if (hr == S_OK)
 507                     hr = IStream_Read(pStm, &header, sizeof(header), &actual_read);
 508
 509                 /* can't use SUCCEEDED(hr): S_FALSE counts as an error */
 510                 if (hr == S_OK && actual_read == sizeof(header)
 511                     && header.dvAspect == cache_entry->fmtetc.dwAspect)
 512                 {
 513                     /* Rewind the stream before returning it. */
 514                     LARGE_INTEGER offset;
 515                     offset.u.LowPart = 0;
 516                     offset.u.HighPart = 0;
 517                     IStream_Seek(pStm, offset, STREAM_SEEK_SET, NULL);
 518
 519                     *ppStm = pStm;
 520
 521                     CoTaskMemFree(elem.pwcsName);
 522                     IEnumSTATSTG_Release(pEnum);
 523
 524                     return S_OK;
 525                 }
 526
 527                 IStream_Release(pStm);
 528             }
 529         }
 530
 531         CoTaskMemFree(elem.pwcsName);
 532     }
 533
 534     IEnumSTATSTG_Release(pEnum);
 535
 536     return (hr == S_FALSE ? OLE_E_BLANK : hr);
 537 }
 538
 539 /************************************************************************
 540  * DataCacheEntry_LoadData
 541  *
 542  * This method will read information for the requested presentation
 543  * into the given structure.
 544  *
 545  * Param:
 546  *   This - The entry to load the data from.
 547  *
 548  * Returns:
 549  *   This method returns a metafile handle if it is successful.
 550  *   it will return 0 if not.
 551  */
 552 static HRESULT DataCacheEntry_LoadData(DataCacheEntry *cache_entry)
 553 {
 554   IStream*      presStream = NULL;
 555   HRESULT       hres;
 556   ULARGE_INTEGER current_pos;
 557   STATSTG       streamInfo;
 558   void*         metafileBits;
 559   METAFILEPICT *mfpict;
 560   HGLOBAL       hmfpict;
 561   PresentationDataHeader header;
 562   CLIPFORMAT    clipformat;
 563   static const LARGE_INTEGER offset_zero;
 564
 565   /*
 566    * Open the presentation stream.
 567    */
 568   hres = DataCacheEntry_OpenPresStream(cache_entry, &presStream);
 569
 570   if (FAILED(hres))
 571     return hres;
 572
 573   /*
 574    * Get the size of the stream.
 575    */
 576   hres = IStream_Stat(presStream,
 577                       &streamInfo,
 578                       STATFLAG_NONAME);
 579
 580   /*
 581    * Read the header.
 582    */
 583
 584   hres = read_clipformat(presStream, &clipformat);
 585   if (FAILED(hres))
 586   {
 587       IStream_Release(presStream);
 588       return hres;
 589   }
 590
 591   hres = IStream_Read(
 592                       presStream,
 593                       &header,
 594                       sizeof(PresentationDataHeader),
 595                       NULL);
 596   if (hres != S_OK)
 597   {
 598       IStream_Release(presStream);
 599       return E_FAIL;
 600   }
 601
 602   hres = IStream_Seek(presStream, offset_zero, STREAM_SEEK_CUR, &current_pos);
 603
 604   streamInfo.cbSize.QuadPart -= current_pos.QuadPart;
 605
 606   hmfpict = GlobalAlloc(GMEM_MOVEABLE, sizeof(METAFILEPICT));
 607   if (!hmfpict)
 608   {
 609       IStream_Release(presStream);
 610       return E_OUTOFMEMORY;
 611   }
 612   mfpict = GlobalLock(hmfpict);
 613
 614   /*
 615    * Allocate a buffer for the metafile bits.
 616    */
 617   metafileBits = HeapAlloc(GetProcessHeap(),
 618                            0,
 619                            streamInfo.cbSize.u.LowPart);
 620
 621   /*
 622    * Read the metafile bits.
 623    */
 624   hres = IStream_Read(
 625            presStream,
 626            metafileBits,
 627            streamInfo.cbSize.u.LowPart,
 628            NULL);
 629
 630   /*
 631    * Create a metafile with those bits.
 632    */
 633   if (SUCCEEDED(hres))
 634   {
 635     /* FIXME: get this from the stream */
 636     mfpict->mm = MM_ANISOTROPIC;
 637     mfpict->xExt = header.dwObjectExtentX;
 638     mfpict->yExt = header.dwObjectExtentY;
 639     mfpict->hMF = SetMetaFileBitsEx(streamInfo.cbSize.u.LowPart, metafileBits);
 640     if (!mfpict->hMF)
 641       hres = E_FAIL;
 642   }
 643
 644   GlobalUnlock(hmfpict);
 645   if (SUCCEEDED(hres))
 646   {
 647     cache_entry->data_cf = cache_entry->fmtetc.cfFormat;
 648     cache_entry->stgmedium.tymed = TYMED_MFPICT;
 649     cache_entry->stgmedium.u.hMetaFilePict = hmfpict;
 650   }
 651   else
 652     GlobalFree(hmfpict);
 653
 654   /*
 655    * Cleanup.
 656    */
 657   HeapFree(GetProcessHeap(), 0, metafileBits);
 658   IStream_Release(presStream);
 659
 660   return hres;
 661 }
 662
 663 static HRESULT DataCacheEntry_CreateStream(DataCacheEntry *cache_entry,
 664                                            IStorage *storage, IStream **stream)
 665 {
 666     WCHAR wszName[] = {2,'O','l','e','P','r','e','s',
 667         '0' + (cache_entry->stream_number / 100) % 10,
 668         '0' + (cache_entry->stream_number / 10) % 10,
 669         '0' + cache_entry->stream_number % 10, 0};
 670
 671     /* FIXME: cache the created stream in This? */
 672     return IStorage_CreateStream(storage, wszName,
 673                                  STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE,
 674                                  0, 0, stream);
 675 }
 676
 677 static HRESULT DataCacheEntry_Save(DataCacheEntry *cache_entry, IStorage *storage,
 678                                    BOOL same_as_load)
 679 {
 680     PresentationDataHeader header;
 681     HRESULT hr;
 682     IStream *pres_stream;
 683     void *data = NULL;
 684
 685     TRACE("stream_number = %d, fmtetc = %s\n", cache_entry->stream_number, debugstr_formatetc(&cache_entry->fmtetc));
 686
 687     hr = DataCacheEntry_CreateStream(cache_entry, storage, &pres_stream);
 688     if (FAILED(hr))
 689         return hr;
 690
 691     hr = write_clipformat(pres_stream, cache_entry->data_cf);
 692     if (FAILED(hr))
 693         return hr;
 694
 695     if (cache_entry->fmtetc.ptd)
 696         FIXME("ptd not serialized\n");
 697     header.unknown3 = 4;
 698     header.dvAspect = cache_entry->fmtetc.dwAspect;
 699     header.lindex = cache_entry->fmtetc.lindex;
 700     header.tymed = cache_entry->stgmedium.tymed;
 701     header.unknown7 = 0;
 702     header.dwObjectExtentX = 0;
 703     header.dwObjectExtentY = 0;
 704     header.dwSize = 0;
 705
 706     /* size the data */
 707     switch (cache_entry->data_cf)
 708     {
 709         case CF_METAFILEPICT:
 710         {
 711             if (cache_entry->stgmedium.tymed != TYMED_NULL)
 712             {
 713                 const METAFILEPICT *mfpict = GlobalLock(cache_entry->stgmedium.u.hMetaFilePict);
 714                 if (!mfpict)
 715                 {
 716                     IStream_Release(pres_stream);
 717                     return DV_E_STGMEDIUM;
 718                 }
 719                 header.dwObjectExtentX = mfpict->xExt;
 720                 header.dwObjectExtentY = mfpict->yExt;
 721                 header.dwSize = GetMetaFileBitsEx(mfpict->hMF, 0, NULL);
 722                 GlobalUnlock(cache_entry->stgmedium.u.hMetaFilePict);
 723             }
 724             break;
 725         }
 726         default:
 727             break;
 728     }
 729
 730     /*
 731      * Write the header.
 732      */
 733     hr = IStream_Write(pres_stream, &header, sizeof(PresentationDataHeader),
 734                        NULL);
 735     if (FAILED(hr))
 736     {
 737         IStream_Release(pres_stream);
 738         return hr;
 739     }
 740
 741     /* get the data */
 742     switch (cache_entry->data_cf)
 743     {
 744         case CF_METAFILEPICT:
 745         {
 746             if (cache_entry->stgmedium.tymed != TYMED_NULL)
 747             {
 748                 const METAFILEPICT *mfpict = GlobalLock(cache_entry->stgmedium.u.hMetaFilePict);
 749                 if (!mfpict)
 750                 {
 751                     IStream_Release(pres_stream);
 752                     return DV_E_STGMEDIUM;
 753                 }
 754                 data = HeapAlloc(GetProcessHeap(), 0, header.dwSize);
 755                 GetMetaFileBitsEx(mfpict->hMF, header.dwSize, data);
 756                 GlobalUnlock(cache_entry->stgmedium.u.hMetaFilePict);
 757             }
 758             break;
 759         }
 760         default:
 761             break;
 762     }
 763
 764     if (data)
 765         hr = IStream_Write(pres_stream, data, header.dwSize, NULL);
 766     HeapFree(GetProcessHeap(), 0, data);
 767
 768     IStream_Release(pres_stream);
 769     return hr;
 770 }
 771
 772 /* helper for copying STGMEDIUM of type bitmap, MF, EMF or HGLOBAL.
 773 * does no checking of whether src_stgm has a supported tymed, so this should be
 774 * done in the caller */
 775 static HRESULT copy_stg_medium(CLIPFORMAT cf, STGMEDIUM *dest_stgm,
 776                                const STGMEDIUM *src_stgm)
 777 {
 778     if (src_stgm->tymed == TYMED_MFPICT)
 779     {
 780         const METAFILEPICT *src_mfpict = GlobalLock(src_stgm->u.hMetaFilePict);
 781         METAFILEPICT *dest_mfpict;
 782
 783         if (!src_mfpict)
 784             return DV_E_STGMEDIUM;
 785         dest_stgm->u.hMetaFilePict = GlobalAlloc(GMEM_MOVEABLE, sizeof(METAFILEPICT));
 786         dest_mfpict = GlobalLock(dest_stgm->u.hMetaFilePict);
 787         if (!dest_mfpict)
 788         {
 789             GlobalUnlock(src_stgm->u.hMetaFilePict);
 790             return E_OUTOFMEMORY;
 791         }
 792         *dest_mfpict = *src_mfpict;
 793         dest_mfpict->hMF = CopyMetaFileW(src_mfpict->hMF, NULL);
 794         GlobalUnlock(src_stgm->u.hMetaFilePict);
 795         GlobalUnlock(dest_stgm->u.hMetaFilePict);
 796     }
 797     else if (src_stgm->tymed != TYMED_NULL)
 798     {
 799         dest_stgm->u.hGlobal = OleDuplicateData(src_stgm->u.hGlobal, cf,
 800                                                 GMEM_MOVEABLE);
 801         if (!dest_stgm->u.hGlobal)
 802             return E_OUTOFMEMORY;
 803     }
 804     dest_stgm->tymed = src_stgm->tymed;
 805     dest_stgm->pUnkForRelease = src_stgm->pUnkForRelease;
 806     if (dest_stgm->pUnkForRelease)
 807         IUnknown_AddRef(dest_stgm->pUnkForRelease);
 808     return S_OK;
 809 }
 810
 811 static HRESULT DataCacheEntry_SetData(DataCacheEntry *cache_entry,
 812                                       const FORMATETC *formatetc,
 813                                       const STGMEDIUM *stgmedium,
 814                                       BOOL fRelease)
 815 {
 816     if ((!cache_entry->fmtetc.cfFormat && !formatetc->cfFormat) ||
 817         (cache_entry->fmtetc.tymed == TYMED_NULL && formatetc->tymed == TYMED_NULL) ||
 818         stgmedium->tymed == TYMED_NULL)
 819     {
 820         WARN("invalid formatetc\n");
 821         return DV_E_FORMATETC;
 822     }
 823
 824     cache_entry->dirty = TRUE;
 825     ReleaseStgMedium(&cache_entry->stgmedium);
 826     cache_entry->data_cf = cache_entry->fmtetc.cfFormat ? cache_entry->fmtetc.cfFormat : formatetc->cfFormat;
 827     if (fRelease)
 828     {
 829         cache_entry->stgmedium = *stgmedium;
 830         return S_OK;
 831     }
 832     else
 833         return copy_stg_medium(cache_entry->data_cf,
 834                                &cache_entry->stgmedium, stgmedium);
 835 }
 836
 837 static HRESULT DataCacheEntry_GetData(DataCacheEntry *cache_entry, STGMEDIUM *stgmedium)
 838 {
 839     if (stgmedium->tymed == TYMED_NULL && cache_entry->storage)
 840     {
 841         HRESULT hr = DataCacheEntry_LoadData(cache_entry);
 842         if (FAILED(hr))
 843             return hr;
 844     }
 845     if (cache_entry->stgmedium.tymed == TYMED_NULL)
 846         return OLE_E_BLANK;
 847     return copy_stg_medium(cache_entry->data_cf, stgmedium, &cache_entry->stgmedium);
 848 }
 849
 850 static inline HRESULT DataCacheEntry_DiscardData(DataCacheEntry *cache_entry)
 851 {
 852     ReleaseStgMedium(&cache_entry->stgmedium);
 853     cache_entry->data_cf = cache_entry->fmtetc.cfFormat;
 854     return S_OK;
 855 }
 856
 857 static inline void DataCacheEntry_HandsOffStorage(DataCacheEntry *cache_entry)
 858 {
 859     if (cache_entry->storage)
 860     {
 861         IStorage_Release(cache_entry->storage);
 862         cache_entry->storage = NULL;
 863     }
 864 }
 865
 866 /*********************************************************
 867  * Method implementation for the  non delegating IUnknown
 868  * part of the DataCache class.
 869  */
 870
 871 /************************************************************************
 872  * DataCache_NDIUnknown_QueryInterface (IUnknown)
 873  *
 874  * This version of QueryInterface will not delegate its implementation
 875  * to the outer unknown.
 876  */
 877 static HRESULT WINAPI DataCache_NDIUnknown_QueryInterface(
 878             IUnknown*      iface,
 879             REFIID         riid,
 880             void**         ppvObject)
 881 {
 882   DataCache *this = impl_from_IUnknown(iface);
 883
 884   if ( ppvObject==0 )
 885     return E_INVALIDARG;
 886
 887   *ppvObject = 0;
 888
 889   if (IsEqualIID(&IID_IUnknown, riid))
 890   {
 891     *ppvObject = iface;
 892   }
 893   else if (IsEqualIID(&IID_IDataObject, riid))
 894   {
 895     *ppvObject = &this->IDataObject_iface;
 896   }
 897   else if ( IsEqualIID(&IID_IPersistStorage, riid)  ||
 898             IsEqualIID(&IID_IPersist, riid) )
 899   {
 900     *ppvObject = &this->IPersistStorage_iface;
 901   }
 902   else if ( IsEqualIID(&IID_IViewObject, riid) ||
 903             IsEqualIID(&IID_IViewObject2, riid) )
 904   {
 905     *ppvObject = &this->IViewObject2_iface;
 906   }
 907   else if ( IsEqualIID(&IID_IOleCache, riid) ||
 908             IsEqualIID(&IID_IOleCache2, riid) )
 909   {
 910     *ppvObject = &this->IOleCache2_iface;
 911   }
 912   else if ( IsEqualIID(&IID_IOleCacheControl, riid) )
 913   {
 914     *ppvObject = &this->IOleCacheControl_iface;
 915   }
 916
 917   if ((*ppvObject)==0)
 918   {
 919     WARN( "() : asking for unsupported interface %s\n", debugstr_guid(riid));
 920     return E_NOINTERFACE;
 921   }
 922
 923   IUnknown_AddRef((IUnknown*)*ppvObject);
 924
 925   return S_OK;
 926 }
 927
 928 /************************************************************************
 929  * DataCache_NDIUnknown_AddRef (IUnknown)
 930  *
 931  * This version of QueryInterface will not delegate its implementation
 932  * to the outer unknown.
 933  */
 934 static ULONG WINAPI DataCache_NDIUnknown_AddRef(
 935             IUnknown*      iface)
 936 {
 937   DataCache *this = impl_from_IUnknown(iface);
 938   return InterlockedIncrement(&this->ref);
 939 }
 940
 941 /************************************************************************
 942  * DataCache_NDIUnknown_Release (IUnknown)
 943  *
 944  * This version of QueryInterface will not delegate its implementation
 945  * to the outer unknown.
 946  */
 947 static ULONG WINAPI DataCache_NDIUnknown_Release(
 948             IUnknown*      iface)
 949 {
 950   DataCache *this = impl_from_IUnknown(iface);
 951   ULONG ref;
 952
 953   ref = InterlockedDecrement(&this->ref);
 954
 955   if (ref == 0) DataCache_Destroy(this);
 956
 957   return ref;
 958 }
 959
 960 /*********************************************************
 961  * Method implementation for the IDataObject
 962  * part of the DataCache class.
 963  */
 964
 965 /************************************************************************
 966  * DataCache_IDataObject_QueryInterface (IUnknown)
 967  */
 968 static HRESULT WINAPI DataCache_IDataObject_QueryInterface(
 969             IDataObject*     iface,
 970             REFIID           riid,
 971             void**           ppvObject)
 972 {
 973   DataCache *this = impl_from_IDataObject(iface);
 974
 975   return IUnknown_QueryInterface(this->outerUnknown, riid, ppvObject);
 976 }
 977
 978 /************************************************************************
 979  * DataCache_IDataObject_AddRef (IUnknown)
 980  */
 981 static ULONG WINAPI DataCache_IDataObject_AddRef(
 982             IDataObject*     iface)
 983 {
 984   DataCache *this = impl_from_IDataObject(iface);
 985
 986   return IUnknown_AddRef(this->outerUnknown);
 987 }
 988
 989 /************************************************************************
 990  * DataCache_IDataObject_Release (IUnknown)
 991  */
 992 static ULONG WINAPI DataCache_IDataObject_Release(
 993             IDataObject*     iface)
 994 {
 995   DataCache *this = impl_from_IDataObject(iface);
 996
 997   return IUnknown_Release(this->outerUnknown);
 998 }
 999
1000 /************************************************************************
1001  * DataCache_GetData
1002  *
1003  * Get Data from a source dataobject using format pformatetcIn->cfFormat
1004  */
1005 static HRESULT WINAPI DataCache_GetData(
1006             IDataObject*     iface,
1007             LPFORMATETC      pformatetcIn,
1008             STGMEDIUM*       pmedium)
1009 {
1010     DataCache *This = impl_from_IDataObject(iface);
1011     DataCacheEntry *cache_entry;
1012
1013     memset(pmedium, 0, sizeof(*pmedium));
1014
1015     cache_entry = DataCache_GetEntryForFormatEtc(This, pformatetcIn);
1016     if (!cache_entry)
1017         return OLE_E_BLANK;
1018
1019     return DataCacheEntry_GetData(cache_entry, pmedium);
1020 }
1021
1022 static HRESULT WINAPI DataCache_GetDataHere(
1023             IDataObject*     iface,
1024             LPFORMATETC      pformatetc,
1025             STGMEDIUM*       pmedium)
1026 {
1027   FIXME("stub\n");
1028   return E_NOTIMPL;
1029 }
1030
1031 static HRESULT WINAPI DataCache_QueryGetData(
1032             IDataObject*     iface,
1033             LPFORMATETC      pformatetc)
1034 {
1035   FIXME("stub\n");
1036   return E_NOTIMPL;
1037 }
1038
1039 /************************************************************************
1040  * DataCache_EnumFormatEtc (IDataObject)
1041  *
1042  * The data cache doesn't implement this method.
1043  */
1044 static HRESULT WINAPI DataCache_GetCanonicalFormatEtc(
1045             IDataObject*     iface,
1046             LPFORMATETC      pformatectIn,
1047             LPFORMATETC      pformatetcOut)
1048 {
1049   TRACE("()\n");
1050   return E_NOTIMPL;
1051 }
1052
1053 /************************************************************************
1054  * DataCache_IDataObject_SetData (IDataObject)
1055  *
1056  * This method is delegated to the IOleCache2 implementation.
1057  */
1058 static HRESULT WINAPI DataCache_IDataObject_SetData(
1059             IDataObject*     iface,
1060             LPFORMATETC      pformatetc,
1061             STGMEDIUM*       pmedium,
1062             BOOL             fRelease)
1063 {
1064   IOleCache2* oleCache = NULL;
1065   HRESULT     hres;
1066
1067   TRACE("(%p, %p, %p, %d)\n", iface, pformatetc, pmedium, fRelease);
1068
1069   hres = IDataObject_QueryInterface(iface, &IID_IOleCache2, (void**)&oleCache);
1070
1071   if (FAILED(hres))
1072     return E_UNEXPECTED;
1073
1074   hres = IOleCache2_SetData(oleCache, pformatetc, pmedium, fRelease);
1075
1076   IOleCache2_Release(oleCache);
1077
1078   return hres;
1079 }
1080
1081 /************************************************************************
1082  * DataCache_EnumFormatEtc (IDataObject)
1083  *
1084  * The data cache doesn't implement this method.
1085  */
1086 static HRESULT WINAPI DataCache_EnumFormatEtc(
1087             IDataObject*     iface,
1088             DWORD            dwDirection,
1089             IEnumFORMATETC** ppenumFormatEtc)
1090 {
1091   TRACE("()\n");
1092   return E_NOTIMPL;
1093 }
1094
1095 /************************************************************************
1096  * DataCache_DAdvise (IDataObject)
1097  *
1098  * The data cache doesn't support connections.
1099  */
1100 static HRESULT WINAPI DataCache_DAdvise(
1101             IDataObject*     iface,
1102             FORMATETC*       pformatetc,
1103             DWORD            advf,
1104             IAdviseSink*     pAdvSink,
1105             DWORD*           pdwConnection)
1106 {
1107   TRACE("()\n");
1108   return OLE_E_ADVISENOTSUPPORTED;
1109 }
1110
1111 /************************************************************************
1112  * DataCache_DUnadvise (IDataObject)
1113  *
1114  * The data cache doesn't support connections.
1115  */
1116 static HRESULT WINAPI DataCache_DUnadvise(
1117             IDataObject*     iface,
1118             DWORD            dwConnection)
1119 {
1120   TRACE("()\n");
1121   return OLE_E_NOCONNECTION;
1122 }
1123
1124 /************************************************************************
1125  * DataCache_EnumDAdvise (IDataObject)
1126  *
1127  * The data cache doesn't support connections.
1128  */
1129 static HRESULT WINAPI DataCache_EnumDAdvise(
1130             IDataObject*     iface,
1131             IEnumSTATDATA**  ppenumAdvise)
1132 {
1133   TRACE("()\n");
1134   return OLE_E_ADVISENOTSUPPORTED;
1135 }
1136
1137 /*********************************************************
1138  * Method implementation for the IDataObject
1139  * part of the DataCache class.
1140  */
1141
1142 /************************************************************************
1143  * DataCache_IPersistStorage_QueryInterface (IUnknown)
1144  */
1145 static HRESULT WINAPI DataCache_IPersistStorage_QueryInterface(
1146             IPersistStorage* iface,
1147             REFIID           riid,
1148             void**           ppvObject)
1149 {
1150   DataCache *this = impl_from_IPersistStorage(iface);
1151
1152   return IUnknown_QueryInterface(this->outerUnknown, riid, ppvObject);
1153 }
1154
1155 /************************************************************************
1156  * DataCache_IPersistStorage_AddRef (IUnknown)
1157  */
1158 static ULONG WINAPI DataCache_IPersistStorage_AddRef(
1159             IPersistStorage* iface)
1160 {
1161   DataCache *this = impl_from_IPersistStorage(iface);
1162
1163   return IUnknown_AddRef(this->outerUnknown);
1164 }
1165
1166 /************************************************************************
1167  * DataCache_IPersistStorage_Release (IUnknown)
1168  */
1169 static ULONG WINAPI DataCache_IPersistStorage_Release(
1170             IPersistStorage* iface)
1171 {
1172   DataCache *this = impl_from_IPersistStorage(iface);
1173
1174   return IUnknown_Release(this->outerUnknown);
1175 }
1176
1177 /************************************************************************
1178  * DataCache_GetClassID (IPersistStorage)
1179  *
1180  * The data cache doesn't implement this method.
1181  */
1182 static HRESULT WINAPI DataCache_GetClassID(
1183             IPersistStorage* iface,
1184             CLSID*           pClassID)
1185 {
1186   DataCache *This = impl_from_IPersistStorage(iface);
1187   DataCacheEntry *cache_entry;
1188
1189   TRACE("(%p, %p)\n", iface, pClassID);
1190
1191   LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1192   {
1193     if (cache_entry->storage != NULL)
1194     {
1195       STATSTG statstg;
1196       HRESULT hr = IStorage_Stat(cache_entry->storage, &statstg, STATFLAG_NONAME);
1197       if (SUCCEEDED(hr))
1198       {
1199         *pClassID = statstg.clsid;
1200         return S_OK;
1201       }
1202     }
1203   }
1204
1205   *pClassID = CLSID_NULL;
1206
1207   return S_OK;
1208 }
1209
1210 /************************************************************************
1211  * DataCache_IsDirty (IPersistStorage)
1212  */
1213 static HRESULT WINAPI DataCache_IsDirty(
1214             IPersistStorage* iface)
1215 {
1216     DataCache *This = impl_from_IPersistStorage(iface);
1217     DataCacheEntry *cache_entry;
1218
1219     TRACE("(%p)\n", iface);
1220
1221     if (This->dirty)
1222         return S_OK;
1223
1224     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1225         if (cache_entry->dirty)
1226             return S_OK;
1227
1228     return S_FALSE;
1229 }
1230
1231 /************************************************************************
1232  * DataCache_InitNew (IPersistStorage)
1233  *
1234  * The data cache implementation of IPersistStorage_InitNew simply stores
1235  * the storage pointer.
1236  */
1237 static HRESULT WINAPI DataCache_InitNew(
1238             IPersistStorage* iface,
1239             IStorage*        pStg)
1240 {
1241     DataCache *This = impl_from_IPersistStorage(iface);
1242
1243     TRACE("(%p, %p)\n", iface, pStg);
1244
1245     if (This->presentationStorage != NULL)
1246         IStorage_Release(This->presentationStorage);
1247
1248     This->presentationStorage = pStg;
1249
1250     IStorage_AddRef(This->presentationStorage);
1251     This->dirty = TRUE;
1252
1253     return S_OK;
1254 }
1255
1256 /************************************************************************
1257  * DataCache_Load (IPersistStorage)
1258  *
1259  * The data cache implementation of IPersistStorage_Load doesn't
1260  * actually load anything. Instead, it holds on to the storage pointer
1261  * and it will load the presentation information when the
1262  * IDataObject_GetData or IViewObject2_Draw methods are called.
1263  */
1264 static HRESULT WINAPI DataCache_Load(
1265             IPersistStorage* iface,
1266             IStorage*        pStg)
1267 {
1268     DataCache *This = impl_from_IPersistStorage(iface);
1269     STATSTG elem;
1270     IEnumSTATSTG *pEnum;
1271     HRESULT hr;
1272
1273     TRACE("(%p, %p)\n", iface, pStg);
1274
1275     if (This->presentationStorage != NULL)
1276       IStorage_Release(This->presentationStorage);
1277
1278     This->presentationStorage = pStg;
1279
1280     hr = IStorage_EnumElements(pStg, 0, NULL, 0, &pEnum);
1281     if (FAILED(hr)) return hr;
1282
1283     while ((hr = IEnumSTATSTG_Next(pEnum, 1, &elem, NULL)) == S_OK)
1284     {
1285         if (DataCache_IsPresentationStream(&elem))
1286         {
1287             IStream *pStm;
1288
1289             hr = IStorage_OpenStream(This->presentationStorage, elem.pwcsName,
1290                                      NULL, STGM_READ | STGM_SHARE_EXCLUSIVE, 0,
1291                                      &pStm);
1292             if (SUCCEEDED(hr))
1293             {
1294                 PresentationDataHeader header;
1295                 ULONG actual_read;
1296                 CLIPFORMAT clipformat;
1297
1298                 hr = read_clipformat(pStm, &clipformat);
1299
1300                 if (hr == S_OK)
1301                     hr = IStream_Read(pStm, &header, sizeof(header),
1302                                       &actual_read);
1303
1304                 /* can't use SUCCEEDED(hr): S_FALSE counts as an error */
1305                 if (hr == S_OK && actual_read == sizeof(header))
1306                 {
1307                     DataCacheEntry *cache_entry;
1308                     FORMATETC fmtetc;
1309
1310                     fmtetc.cfFormat = clipformat;
1311                     fmtetc.ptd = NULL; /* FIXME */
1312                     fmtetc.dwAspect = header.dvAspect;
1313                     fmtetc.lindex = header.lindex;
1314                     fmtetc.tymed = header.tymed;
1315
1316                     TRACE("loading entry with formatetc: %s\n", debugstr_formatetc(&fmtetc));
1317
1318                     cache_entry = DataCache_GetEntryForFormatEtc(This, &fmtetc);
1319                     if (!cache_entry)
1320                         hr = DataCache_CreateEntry(This, &fmtetc, &cache_entry);
1321                     if (SUCCEEDED(hr))
1322                     {
1323                         DataCacheEntry_DiscardData(cache_entry);
1324                         if (cache_entry->storage) IStorage_Release(cache_entry->storage);
1325                         cache_entry->storage = pStg;
1326                         IStorage_AddRef(pStg);
1327                         cache_entry->dirty = FALSE;
1328                     }
1329                 }
1330
1331                 IStream_Release(pStm);
1332             }
1333         }
1334
1335         CoTaskMemFree(elem.pwcsName);
1336     }
1337
1338     This->dirty = FALSE;
1339
1340     IEnumSTATSTG_Release(pEnum);
1341
1342     IStorage_AddRef(This->presentationStorage);
1343     return S_OK;
1344 }
1345
1346 /************************************************************************
1347  * DataCache_Save (IPersistStorage)
1348  *
1349  * Until we actually connect to a running object and retrieve new
1350  * information to it, we never have to save anything. However, it is
1351  * our responsibility to copy the information when saving to a new
1352  * storage.
1353  */
1354 static HRESULT WINAPI DataCache_Save(
1355             IPersistStorage* iface,
1356             IStorage*        pStg,
1357             BOOL             fSameAsLoad)
1358 {
1359     DataCache *This = impl_from_IPersistStorage(iface);
1360     DataCacheEntry *cache_entry;
1361     BOOL dirty = FALSE;
1362     HRESULT hr = S_OK;
1363     unsigned short stream_number = 0;
1364
1365     TRACE("(%p, %p, %d)\n", iface, pStg, fSameAsLoad);
1366
1367     dirty = This->dirty;
1368     if (!dirty)
1369     {
1370         LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1371         {
1372             dirty = cache_entry->dirty;
1373             if (dirty)
1374                 break;
1375         }
1376     }
1377
1378     /* this is a shortcut if nothing changed */
1379     if (!dirty && !fSameAsLoad && This->presentationStorage)
1380     {
1381         return IStorage_CopyTo(This->presentationStorage, 0, NULL, NULL, pStg);
1382     }
1383
1384     /* assign stream numbers to the cache entries */
1385     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1386     {
1387         if (cache_entry->stream_number != stream_number)
1388         {
1389             cache_entry->dirty = TRUE; /* needs to be written out again */
1390             cache_entry->stream_number = stream_number;
1391         }
1392         stream_number++;
1393     }
1394
1395     /* write out the cache entries */
1396     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1397     {
1398         if (!fSameAsLoad || cache_entry->dirty)
1399         {
1400             hr = DataCacheEntry_Save(cache_entry, pStg, fSameAsLoad);
1401             if (FAILED(hr))
1402                 break;
1403
1404             cache_entry->dirty = FALSE;
1405         }
1406     }
1407
1408     This->dirty = FALSE;
1409     return hr;
1410 }
1411
1412 /************************************************************************
1413  * DataCache_SaveCompleted (IPersistStorage)
1414  *
1415  * This method is called to tell the cache to release the storage
1416  * pointer it's currently holding.
1417  */
1418 static HRESULT WINAPI DataCache_SaveCompleted(
1419             IPersistStorage* iface,
1420             IStorage*        pStgNew)
1421 {
1422   TRACE("(%p, %p)\n", iface, pStgNew);
1423
1424   if (pStgNew)
1425   {
1426     IPersistStorage_HandsOffStorage(iface);
1427
1428     DataCache_Load(iface, pStgNew);
1429   }
1430
1431   return S_OK;
1432 }
1433
1434 /************************************************************************
1435  * DataCache_HandsOffStorage (IPersistStorage)
1436  *
1437  * This method is called to tell the cache to release the storage
1438  * pointer it's currently holding.
1439  */
1440 static HRESULT WINAPI DataCache_HandsOffStorage(
1441             IPersistStorage* iface)
1442 {
1443   DataCache *this = impl_from_IPersistStorage(iface);
1444   DataCacheEntry *cache_entry;
1445
1446   TRACE("(%p)\n", iface);
1447
1448   if (this->presentationStorage != NULL)
1449   {
1450     IStorage_Release(this->presentationStorage);
1451     this->presentationStorage = NULL;
1452   }
1453
1454   LIST_FOR_EACH_ENTRY(cache_entry, &this->cache_list, DataCacheEntry, entry)
1455     DataCacheEntry_HandsOffStorage(cache_entry);
1456
1457   return S_OK;
1458 }
1459
1460 /*********************************************************
1461  * Method implementation for the IViewObject2
1462  * part of the DataCache class.
1463  */
1464
1465 /************************************************************************
1466  * DataCache_IViewObject2_QueryInterface (IUnknown)
1467  */
1468 static HRESULT WINAPI DataCache_IViewObject2_QueryInterface(
1469             IViewObject2* iface,
1470             REFIID           riid,
1471             void**           ppvObject)
1472 {
1473   DataCache *this = impl_from_IViewObject2(iface);
1474
1475   return IUnknown_QueryInterface(this->outerUnknown, riid, ppvObject);
1476 }
1477
1478 /************************************************************************
1479  * DataCache_IViewObject2_AddRef (IUnknown)
1480  */
1481 static ULONG WINAPI DataCache_IViewObject2_AddRef(
1482             IViewObject2* iface)
1483 {
1484   DataCache *this = impl_from_IViewObject2(iface);
1485
1486   return IUnknown_AddRef(this->outerUnknown);
1487 }
1488
1489 /************************************************************************
1490  * DataCache_IViewObject2_Release (IUnknown)
1491  */
1492 static ULONG WINAPI DataCache_IViewObject2_Release(
1493             IViewObject2* iface)
1494 {
1495   DataCache *this = impl_from_IViewObject2(iface);
1496
1497   return IUnknown_Release(this->outerUnknown);
1498 }
1499
1500 /************************************************************************
1501  * DataCache_Draw (IViewObject2)
1502  *
1503  * This method will draw the cached representation of the object
1504  * to the given device context.
1505  */
1506 static HRESULT WINAPI DataCache_Draw(
1507             IViewObject2*    iface,
1508             DWORD            dwDrawAspect,
1509             LONG             lindex,
1510             void*            pvAspect,
1511             DVTARGETDEVICE*  ptd,
1512             HDC              hdcTargetDev,
1513             HDC              hdcDraw,
1514             LPCRECTL         lprcBounds,
1515             LPCRECTL         lprcWBounds,
1516             BOOL  (CALLBACK *pfnContinue)(ULONG_PTR dwContinue),
1517             ULONG_PTR        dwContinue)
1518 {
1519   DataCache *This = impl_from_IViewObject2(iface);
1520   HRESULT                hres;
1521   DataCacheEntry        *cache_entry;
1522
1523   TRACE("(%p, %x, %d, %p, %p, %p, %p, %p, %p, %lx)\n",
1524         iface,
1525         dwDrawAspect,
1526         lindex,
1527         pvAspect,
1528         hdcTargetDev,
1529         hdcDraw,
1530         lprcBounds,
1531         lprcWBounds,
1532         pfnContinue,
1533         dwContinue);
1534
1535   if (lprcBounds==NULL)
1536     return E_INVALIDARG;
1537
1538   LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1539   {
1540     /* FIXME: compare ptd too */
1541     if ((cache_entry->fmtetc.dwAspect != dwDrawAspect) ||
1542         (cache_entry->fmtetc.lindex != lindex))
1543       continue;
1544
1545     /* if the data hasn't been loaded yet, do it now */
1546     if ((cache_entry->stgmedium.tymed == TYMED_NULL) && cache_entry->storage)
1547     {
1548       hres = DataCacheEntry_LoadData(cache_entry);
1549       if (FAILED(hres))
1550         continue;
1551     }
1552
1553     /* no data */
1554     if (cache_entry->stgmedium.tymed == TYMED_NULL)
1555       continue;
1556
1557     if (pfnContinue && !pfnContinue(dwContinue)) return E_ABORT;
1558
1559     switch (cache_entry->data_cf)
1560     {
1561       case CF_METAFILEPICT:
1562       {
1563         /*
1564          * We have to be careful not to modify the state of the
1565          * DC.
1566          */
1567         INT   prevMapMode;
1568         SIZE  oldWindowExt;
1569         SIZE  oldViewportExt;
1570         POINT oldViewportOrg;
1571         METAFILEPICT *mfpict;
1572
1573         if ((cache_entry->stgmedium.tymed != TYMED_MFPICT) ||
1574             !((mfpict = GlobalLock(cache_entry->stgmedium.u.hMetaFilePict))))
1575           continue;
1576
1577         prevMapMode = SetMapMode(hdcDraw, mfpict->mm);
1578
1579         SetWindowExtEx(hdcDraw,
1580                        mfpict->xExt,
1581                        mfpict->yExt,
1582                        &oldWindowExt);
1583
1584         SetViewportExtEx(hdcDraw,
1585                          lprcBounds->right - lprcBounds->left,
1586                          lprcBounds->bottom - lprcBounds->top,
1587                          &oldViewportExt);
1588
1589         SetViewportOrgEx(hdcDraw,
1590                          lprcBounds->left,
1591                          lprcBounds->top,
1592                          &oldViewportOrg);
1593
1594         PlayMetaFile(hdcDraw, mfpict->hMF);
1595
1596         SetWindowExtEx(hdcDraw,
1597                        oldWindowExt.cx,
1598                        oldWindowExt.cy,
1599                        NULL);
1600
1601         SetViewportExtEx(hdcDraw,
1602                          oldViewportExt.cx,
1603                          oldViewportExt.cy,
1604                          NULL);
1605
1606         SetViewportOrgEx(hdcDraw,
1607                          oldViewportOrg.x,
1608                          oldViewportOrg.y,
1609                          NULL);
1610
1611         SetMapMode(hdcDraw, prevMapMode);
1612
1613         GlobalUnlock(cache_entry->stgmedium.u.hMetaFilePict);
1614
1615         return S_OK;
1616       }
1617     }
1618   }
1619
1620   WARN("no data could be found to be drawn\n");
1621
1622   return OLE_E_BLANK;
1623 }
1624
1625 static HRESULT WINAPI DataCache_GetColorSet(
1626             IViewObject2*   iface,
1627             DWORD           dwDrawAspect,
1628             LONG            lindex,
1629             void*           pvAspect,
1630             DVTARGETDEVICE* ptd,
1631             HDC             hicTargetDevice,
1632             LOGPALETTE**    ppColorSet)
1633 {
1634   FIXME("stub\n");
1635   return E_NOTIMPL;
1636 }
1637
1638 static HRESULT WINAPI DataCache_Freeze(
1639             IViewObject2*   iface,
1640             DWORD           dwDrawAspect,
1641             LONG            lindex,
1642             void*           pvAspect,
1643             DWORD*          pdwFreeze)
1644 {
1645   FIXME("stub\n");
1646   return E_NOTIMPL;
1647 }
1648
1649 static HRESULT WINAPI DataCache_Unfreeze(
1650             IViewObject2*   iface,
1651             DWORD           dwFreeze)
1652 {
1653   FIXME("stub\n");
1654   return E_NOTIMPL;
1655 }
1656
1657 /************************************************************************
1658  * DataCache_SetAdvise (IViewObject2)
1659  *
1660  * This sets-up an advisory sink with the data cache. When the object's
1661  * view changes, this sink is called.
1662  */
1663 static HRESULT WINAPI DataCache_SetAdvise(
1664             IViewObject2*   iface,
1665             DWORD           aspects,
1666             DWORD           advf,
1667             IAdviseSink*    pAdvSink)
1668 {
1669   DataCache *this = impl_from_IViewObject2(iface);
1670
1671   TRACE("(%p, %x, %x, %p)\n", iface, aspects, advf, pAdvSink);
1672
1673   /*
1674    * A call to this function removes the previous sink
1675    */
1676   if (this->sinkInterface != NULL)
1677   {
1678     IAdviseSink_Release(this->sinkInterface);
1679     this->sinkInterface  = NULL;
1680     this->sinkAspects    = 0;
1681     this->sinkAdviseFlag = 0;
1682   }
1683
1684   /*
1685    * Now, setup the new one.
1686    */
1687   if (pAdvSink!=NULL)
1688   {
1689     this->sinkInterface  = pAdvSink;
1690     this->sinkAspects    = aspects;
1691     this->sinkAdviseFlag = advf;
1692
1693     IAdviseSink_AddRef(this->sinkInterface);
1694   }
1695
1696   /*
1697    * When the ADVF_PRIMEFIRST flag is set, we have to advise the
1698    * sink immediately.
1699    */
1700   if (advf & ADVF_PRIMEFIRST)
1701   {
1702     DataCache_FireOnViewChange(this, aspects, -1);
1703   }
1704
1705   return S_OK;
1706 }
1707
1708 /************************************************************************
1709  * DataCache_GetAdvise (IViewObject2)
1710  *
1711  * This method queries the current state of the advise sink
1712  * installed on the data cache.
1713  */
1714 static HRESULT WINAPI DataCache_GetAdvise(
1715             IViewObject2*   iface,
1716             DWORD*          pAspects,
1717             DWORD*          pAdvf,
1718             IAdviseSink**   ppAdvSink)
1719 {
1720   DataCache *this = impl_from_IViewObject2(iface);
1721
1722   TRACE("(%p, %p, %p, %p)\n", iface, pAspects, pAdvf, ppAdvSink);
1723
1724   /*
1725    * Just copy all the requested values.
1726    */
1727   if (pAspects!=NULL)
1728     *pAspects = this->sinkAspects;
1729
1730   if (pAdvf!=NULL)
1731     *pAdvf = this->sinkAdviseFlag;
1732
1733   if (ppAdvSink!=NULL)
1734   {
1735     if (this->sinkInterface != NULL)
1736         IAdviseSink_QueryInterface(this->sinkInterface,
1737                                &IID_IAdviseSink,
1738                                (void**)ppAdvSink);
1739     else *ppAdvSink = NULL;
1740   }
1741
1742   return S_OK;
1743 }
1744
1745 /************************************************************************
1746  * DataCache_GetExtent (IViewObject2)
1747  *
1748  * This method retrieves the "natural" size of this cached object.
1749  */
1750 static HRESULT WINAPI DataCache_GetExtent(
1751             IViewObject2*   iface,
1752             DWORD           dwDrawAspect,
1753             LONG            lindex,
1754             DVTARGETDEVICE* ptd,
1755             LPSIZEL         lpsizel)
1756 {
1757   DataCache *This = impl_from_IViewObject2(iface);
1758   HRESULT                hres = E_FAIL;
1759   DataCacheEntry        *cache_entry;
1760
1761   TRACE("(%p, %x, %d, %p, %p)\n",
1762         iface, dwDrawAspect, lindex, ptd, lpsizel);
1763
1764   if (lpsizel==NULL)
1765     return E_POINTER;
1766
1767   lpsizel->cx = 0;
1768   lpsizel->cy = 0;
1769
1770   if (lindex!=-1)
1771     FIXME("Unimplemented flag lindex = %d\n", lindex);
1772
1773   /*
1774    * Right now, we support only the callback from
1775    * the default handler.
1776    */
1777   if (ptd!=NULL)
1778     FIXME("Unimplemented ptd = %p\n", ptd);
1779
1780   LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1781   {
1782     /* FIXME: compare ptd too */
1783     if ((cache_entry->fmtetc.dwAspect != dwDrawAspect) ||
1784         (cache_entry->fmtetc.lindex != lindex))
1785       continue;
1786
1787     /* if the data hasn't been loaded yet, do it now */
1788     if ((cache_entry->stgmedium.tymed == TYMED_NULL) && cache_entry->storage)
1789     {
1790       hres = DataCacheEntry_LoadData(cache_entry);
1791       if (FAILED(hres))
1792         continue;
1793     }
1794
1795     /* no data */
1796     if (cache_entry->stgmedium.tymed == TYMED_NULL)
1797       continue;
1798
1799
1800     switch (cache_entry->data_cf)
1801     {
1802       case CF_METAFILEPICT:
1803       {
1804           METAFILEPICT *mfpict;
1805
1806           if ((cache_entry->stgmedium.tymed != TYMED_MFPICT) ||
1807               !((mfpict = GlobalLock(cache_entry->stgmedium.u.hMetaFilePict))))
1808             continue;
1809
1810         lpsizel->cx = mfpict->xExt;
1811         lpsizel->cy = mfpict->yExt;
1812
1813         GlobalUnlock(cache_entry->stgmedium.u.hMetaFilePict);
1814
1815         return S_OK;
1816       }
1817     }
1818   }
1819
1820   WARN("no data could be found to get the extents from\n");
1821
1822   /*
1823    * This method returns OLE_E_BLANK when it fails.
1824    */
1825   return OLE_E_BLANK;
1826 }
1827
1828
1829 /*********************************************************
1830  * Method implementation for the IOleCache2
1831  * part of the DataCache class.
1832  */
1833
1834 /************************************************************************
1835  * DataCache_IOleCache2_QueryInterface (IUnknown)
1836  */
1837 static HRESULT WINAPI DataCache_IOleCache2_QueryInterface(
1838             IOleCache2*     iface,
1839             REFIID          riid,
1840             void**          ppvObject)
1841 {
1842   DataCache *this = impl_from_IOleCache2(iface);
1843
1844   return IUnknown_QueryInterface(this->outerUnknown, riid, ppvObject);
1845 }
1846
1847 /************************************************************************
1848  * DataCache_IOleCache2_AddRef (IUnknown)
1849  */
1850 static ULONG WINAPI DataCache_IOleCache2_AddRef(
1851             IOleCache2*     iface)
1852 {
1853   DataCache *this = impl_from_IOleCache2(iface);
1854
1855   return IUnknown_AddRef(this->outerUnknown);
1856 }
1857
1858 /************************************************************************
1859  * DataCache_IOleCache2_Release (IUnknown)
1860  */
1861 static ULONG WINAPI DataCache_IOleCache2_Release(
1862             IOleCache2*     iface)
1863 {
1864   DataCache *this = impl_from_IOleCache2(iface);
1865
1866   return IUnknown_Release(this->outerUnknown);
1867 }
1868
1869 /*****************************************************************************
1870  * setup_sink
1871  *
1872  * Set up the sink connection to the running object.
1873  */
1874 static HRESULT setup_sink(DataCache *This, DataCacheEntry *cache_entry)
1875 {
1876     HRESULT hr = S_FALSE;
1877     DWORD flags;
1878
1879     /* Clear the ADVFCACHE_* bits.  Native also sets the two highest bits for some reason. */
1880     flags = cache_entry->advise_flags & ~(ADVFCACHE_NOHANDLER | ADVFCACHE_FORCEBUILTIN | ADVFCACHE_ONSAVE);
1881
1882     if(This->running_object)
1883         if(!(flags & ADVF_NODATA))
1884             hr = IDataObject_DAdvise(This->running_object, &cache_entry->fmtetc, flags,
1885                                      &This->IAdviseSink_iface, &cache_entry->sink_id);
1886     return hr;
1887 }
1888
1889 static HRESULT WINAPI DataCache_Cache(
1890             IOleCache2*     iface,
1891             FORMATETC*      pformatetc,
1892             DWORD           advf,
1893             DWORD*          pdwConnection)
1894 {
1895     DataCache *This = impl_from_IOleCache2(iface);
1896     DataCacheEntry *cache_entry;
1897     HRESULT hr;
1898
1899     TRACE("(%p, 0x%x, %p)\n", pformatetc, advf, pdwConnection);
1900
1901     if (!pformatetc || !pdwConnection)
1902         return E_INVALIDARG;
1903
1904     TRACE("pformatetc = %s\n", debugstr_formatetc(pformatetc));
1905
1906     *pdwConnection = 0;
1907
1908     cache_entry = DataCache_GetEntryForFormatEtc(This, pformatetc);
1909     if (cache_entry)
1910     {
1911         TRACE("found an existing cache entry\n");
1912         *pdwConnection = cache_entry->id;
1913         return CACHE_S_SAMECACHE;
1914     }
1915
1916     hr = DataCache_CreateEntry(This, pformatetc, &cache_entry);
1917
1918     if (SUCCEEDED(hr))
1919     {
1920         *pdwConnection = cache_entry->id;
1921         cache_entry->advise_flags = advf;
1922         setup_sink(This, cache_entry);
1923     }
1924
1925     return hr;
1926 }
1927
1928 static HRESULT WINAPI DataCache_Uncache(
1929             IOleCache2*     iface,
1930             DWORD           dwConnection)
1931 {
1932     DataCache *This = impl_from_IOleCache2(iface);
1933     DataCacheEntry *cache_entry;
1934
1935     TRACE("(%d)\n", dwConnection);
1936
1937     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
1938         if (cache_entry->id == dwConnection)
1939         {
1940             DataCacheEntry_Destroy(This, cache_entry);
1941             return S_OK;
1942         }
1943
1944     WARN("no connection found for %d\n", dwConnection);
1945
1946     return OLE_E_NOCONNECTION;
1947 }
1948
1949 static HRESULT WINAPI DataCache_EnumCache(
1950             IOleCache2*     iface,
1951             IEnumSTATDATA** ppenumSTATDATA)
1952 {
1953   FIXME("stub\n");
1954   return E_NOTIMPL;
1955 }
1956
1957 static HRESULT WINAPI DataCache_InitCache(
1958             IOleCache2*     iface,
1959             IDataObject*    pDataObject)
1960 {
1961   FIXME("stub\n");
1962   return E_NOTIMPL;
1963 }
1964
1965 static HRESULT WINAPI DataCache_IOleCache2_SetData(
1966             IOleCache2*     iface,
1967             FORMATETC*      pformatetc,
1968             STGMEDIUM*      pmedium,
1969             BOOL            fRelease)
1970 {
1971     DataCache *This = impl_from_IOleCache2(iface);
1972     DataCacheEntry *cache_entry;
1973     HRESULT hr;
1974
1975     TRACE("(%p, %p, %s)\n", pformatetc, pmedium, fRelease ? "TRUE" : "FALSE");
1976     TRACE("formatetc = %s\n", debugstr_formatetc(pformatetc));
1977
1978     cache_entry = DataCache_GetEntryForFormatEtc(This, pformatetc);
1979     if (cache_entry)
1980     {
1981         hr = DataCacheEntry_SetData(cache_entry, pformatetc, pmedium, fRelease);
1982
1983         if (SUCCEEDED(hr))
1984             DataCache_FireOnViewChange(This, cache_entry->fmtetc.dwAspect,
1985                                        cache_entry->fmtetc.lindex);
1986
1987         return hr;
1988     }
1989     WARN("cache entry not found\n");
1990
1991     return OLE_E_BLANK;
1992 }
1993
1994 static HRESULT WINAPI DataCache_UpdateCache(
1995             IOleCache2*     iface,
1996             LPDATAOBJECT    pDataObject,
1997             DWORD           grfUpdf,
1998             LPVOID          pReserved)
1999 {
2000   FIXME("(%p, 0x%x, %p): stub\n", pDataObject, grfUpdf, pReserved);
2001   return E_NOTIMPL;
2002 }
2003
2004 static HRESULT WINAPI DataCache_DiscardCache(
2005             IOleCache2*     iface,
2006             DWORD           dwDiscardOptions)
2007 {
2008     DataCache *This = impl_from_IOleCache2(iface);
2009     DataCacheEntry *cache_entry;
2010     HRESULT hr = S_OK;
2011
2012     TRACE("(%d)\n", dwDiscardOptions);
2013
2014     if (dwDiscardOptions == DISCARDCACHE_SAVEIFDIRTY)
2015         hr = DataCache_Save(&This->IPersistStorage_iface, This->presentationStorage, TRUE);
2016
2017     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
2018     {
2019         hr = DataCacheEntry_DiscardData(cache_entry);
2020         if (FAILED(hr))
2021             break;
2022     }
2023
2024     return hr;
2025 }
2026
2027
2028 /*********************************************************
2029  * Method implementation for the IOleCacheControl
2030  * part of the DataCache class.
2031  */
2032
2033 /************************************************************************
2034  * DataCache_IOleCacheControl_QueryInterface (IUnknown)
2035  */
2036 static HRESULT WINAPI DataCache_IOleCacheControl_QueryInterface(
2037             IOleCacheControl* iface,
2038             REFIID            riid,
2039             void**            ppvObject)
2040 {
2041   DataCache *this = impl_from_IOleCacheControl(iface);
2042
2043   return IUnknown_QueryInterface(this->outerUnknown, riid, ppvObject);
2044 }
2045
2046 /************************************************************************
2047  * DataCache_IOleCacheControl_AddRef (IUnknown)
2048  */
2049 static ULONG WINAPI DataCache_IOleCacheControl_AddRef(
2050             IOleCacheControl* iface)
2051 {
2052   DataCache *this = impl_from_IOleCacheControl(iface);
2053
2054   return IUnknown_AddRef(this->outerUnknown);
2055 }
2056
2057 /************************************************************************
2058  * DataCache_IOleCacheControl_Release (IUnknown)
2059  */
2060 static ULONG WINAPI DataCache_IOleCacheControl_Release(
2061             IOleCacheControl* iface)
2062 {
2063   DataCache *this = impl_from_IOleCacheControl(iface);
2064
2065   return IUnknown_Release(this->outerUnknown);
2066 }
2067
2068 /************************************************************************
2069  * DataCache_OnRun (IOleCacheControl)
2070  */
2071 static HRESULT WINAPI DataCache_OnRun(IOleCacheControl* iface, IDataObject *data_obj)
2072 {
2073     DataCache *This = impl_from_IOleCacheControl(iface);
2074     DataCacheEntry *cache_entry;
2075
2076     TRACE("(%p)->(%p)\n", iface, data_obj);
2077
2078     if(This->running_object) return S_OK;
2079
2080     /* No reference is taken on the data object */
2081     This->running_object = data_obj;
2082
2083     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
2084     {
2085         setup_sink(This, cache_entry);
2086     }
2087
2088     return S_OK;
2089 }
2090
2091 /************************************************************************
2092  * DataCache_OnStop (IOleCacheControl)
2093  */
2094 static HRESULT WINAPI DataCache_OnStop(IOleCacheControl* iface)
2095 {
2096     DataCache *This = impl_from_IOleCacheControl(iface);
2097     DataCacheEntry *cache_entry;
2098
2099     TRACE("(%p)\n", iface);
2100
2101     if(!This->running_object) return S_OK;
2102
2103     LIST_FOR_EACH_ENTRY(cache_entry, &This->cache_list, DataCacheEntry, entry)
2104     {
2105         if(cache_entry->sink_id)
2106         {
2107             IDataObject_DUnadvise(This->running_object, cache_entry->sink_id);
2108             cache_entry->sink_id = 0;
2109         }
2110     }
2111
2112     /* No ref taken in OnRun, so no Release call here */
2113     This->running_object = NULL;
2114     return S_OK;
2115 }
2116
2117 /************************************************************************
2118  *              IAdviseSink methods.
2119  * This behaves as an internal object to the data cache.  QI'ing its ptr doesn't
2120  * give access to the cache's other interfaces.  We don't maintain a ref count,
2121  * the object exists as long as the cache is around.
2122  */
2123 static HRESULT WINAPI DataCache_IAdviseSink_QueryInterface(IAdviseSink *iface, REFIID iid, void **obj)
2124 {
2125     *obj = NULL;
2126     if (IsEqualIID(&IID_IUnknown, iid) ||
2127         IsEqualIID(&IID_IAdviseSink, iid))
2128     {
2129         *obj = iface;
2130     }
2131
2132     if(*obj)
2133     {
2134         IAdviseSink_AddRef(iface);
2135         return S_OK;
2136     }
2137     return E_NOINTERFACE;
2138 }
2139
2140 static ULONG WINAPI DataCache_IAdviseSink_AddRef(IAdviseSink *iface)
2141 {
2142     return 2;
2143 }
2144
2145 static ULONG WINAPI DataCache_IAdviseSink_Release(IAdviseSink *iface)
2146 {
2147     return 1;
2148 }
2149
2150 static void WINAPI DataCache_OnDataChange(IAdviseSink *iface, FORMATETC *fmt, STGMEDIUM *med)
2151 {
2152     DataCache *This = impl_from_IAdviseSink(iface);
2153     TRACE("(%p)->(%s, %p)\n", This, debugstr_formatetc(fmt), med);
2154     IOleCache_SetData(&This->IOleCache2_iface, fmt, med, FALSE);
2155 }
2156
2157 static void WINAPI DataCache_OnViewChange(IAdviseSink *iface, DWORD aspect, LONG index)
2158 {
2159     FIXME("stub\n");
2160 }
2161
2162 static void WINAPI DataCache_OnRename(IAdviseSink *iface, IMoniker *mk)
2163 {
2164     FIXME("stub\n");
2165 }
2166
2167 static void WINAPI DataCache_OnSave(IAdviseSink *iface)
2168 {
2169     FIXME("stub\n");
2170 }
2171
2172 static void WINAPI DataCache_OnClose(IAdviseSink *iface)
2173 {
2174     FIXME("stub\n");
2175 }
2176
2177 /*
2178  * Virtual function tables for the DataCache class.
2179  */
2180 static const IUnknownVtbl DataCache_NDIUnknown_VTable =
2181 {
2182   DataCache_NDIUnknown_QueryInterface,
2183   DataCache_NDIUnknown_AddRef,
2184   DataCache_NDIUnknown_Release
2185 };
2186
2187 static const IDataObjectVtbl DataCache_IDataObject_VTable =
2188 {
2189   DataCache_IDataObject_QueryInterface,
2190   DataCache_IDataObject_AddRef,
2191   DataCache_IDataObject_Release,
2192   DataCache_GetData,
2193   DataCache_GetDataHere,
2194   DataCache_QueryGetData,
2195   DataCache_GetCanonicalFormatEtc,
2196   DataCache_IDataObject_SetData,
2197   DataCache_EnumFormatEtc,
2198   DataCache_DAdvise,
2199   DataCache_DUnadvise,
2200   DataCache_EnumDAdvise
2201 };
2202
2203 static const IPersistStorageVtbl DataCache_IPersistStorage_VTable =
2204 {
2205   DataCache_IPersistStorage_QueryInterface,
2206   DataCache_IPersistStorage_AddRef,
2207   DataCache_IPersistStorage_Release,
2208   DataCache_GetClassID,
2209   DataCache_IsDirty,
2210   DataCache_InitNew,
2211   DataCache_Load,
2212   DataCache_Save,
2213   DataCache_SaveCompleted,
2214   DataCache_HandsOffStorage
2215 };
2216
2217 static const IViewObject2Vtbl DataCache_IViewObject2_VTable =
2218 {
2219   DataCache_IViewObject2_QueryInterface,
2220   DataCache_IViewObject2_AddRef,
2221   DataCache_IViewObject2_Release,
2222   DataCache_Draw,
2223   DataCache_GetColorSet,
2224   DataCache_Freeze,
2225   DataCache_Unfreeze,
2226   DataCache_SetAdvise,
2227   DataCache_GetAdvise,
2228   DataCache_GetExtent
2229 };
2230
2231 static const IOleCache2Vtbl DataCache_IOleCache2_VTable =
2232 {
2233   DataCache_IOleCache2_QueryInterface,
2234   DataCache_IOleCache2_AddRef,
2235   DataCache_IOleCache2_Release,
2236   DataCache_Cache,
2237   DataCache_Uncache,
2238   DataCache_EnumCache,
2239   DataCache_InitCache,
2240   DataCache_IOleCache2_SetData,
2241   DataCache_UpdateCache,
2242   DataCache_DiscardCache
2243 };
2244
2245 static const IOleCacheControlVtbl DataCache_IOleCacheControl_VTable =
2246 {
2247   DataCache_IOleCacheControl_QueryInterface,
2248   DataCache_IOleCacheControl_AddRef,
2249   DataCache_IOleCacheControl_Release,
2250   DataCache_OnRun,
2251   DataCache_OnStop
2252 };
2253
2254 static const IAdviseSinkVtbl DataCache_IAdviseSink_VTable =
2255 {
2256     DataCache_IAdviseSink_QueryInterface,
2257     DataCache_IAdviseSink_AddRef,
2258     DataCache_IAdviseSink_Release,
2259     DataCache_OnDataChange,
2260     DataCache_OnViewChange,
2261     DataCache_OnRename,
2262     DataCache_OnSave,
2263     DataCache_OnClose
2264 };
2265
2266 /*********************************************************
2267  * Method implementation for DataCache class.
2268  */
2269 static DataCache* DataCache_Construct(
2270   REFCLSID  clsid,
2271   LPUNKNOWN pUnkOuter)
2272 {
2273   DataCache* newObject = 0;
2274
2275   /*
2276    * Allocate space for the object.
2277    */
2278   newObject = HeapAlloc(GetProcessHeap(), 0, sizeof(DataCache));
2279
2280   if (newObject==0)
2281     return newObject;
2282
2283   /*
2284    * Initialize the virtual function table.
2285    */
2286   newObject->IDataObject_iface.lpVtbl = &DataCache_IDataObject_VTable;
2287   newObject->IUnknown_iface.lpVtbl = &DataCache_NDIUnknown_VTable;
2288   newObject->IPersistStorage_iface.lpVtbl = &DataCache_IPersistStorage_VTable;
2289   newObject->IViewObject2_iface.lpVtbl = &DataCache_IViewObject2_VTable;
2290   newObject->IOleCache2_iface.lpVtbl = &DataCache_IOleCache2_VTable;
2291   newObject->IOleCacheControl_iface.lpVtbl = &DataCache_IOleCacheControl_VTable;
2292   newObject->IAdviseSink_iface.lpVtbl = &DataCache_IAdviseSink_VTable;
2293
2294   /*
2295    * Start with one reference count. The caller of this function
2296    * must release the interface pointer when it is done.
2297    */
2298   newObject->ref = 1;
2299
2300   /*
2301    * Initialize the outer unknown
2302    * We don't keep a reference on the outer unknown since, the way
2303    * aggregation works, our lifetime is at least as large as its
2304    * lifetime.
2305    */
2306   if (pUnkOuter==NULL)
2307     pUnkOuter = &newObject->IUnknown_iface;
2308
2309   newObject->outerUnknown = pUnkOuter;
2310
2311   /*
2312    * Initialize the other members of the structure.
2313    */
2314   newObject->sinkAspects = 0;
2315   newObject->sinkAdviseFlag = 0;
2316   newObject->sinkInterface = 0;
2317   newObject->presentationStorage = NULL;
2318   list_init(&newObject->cache_list);
2319   newObject->last_cache_id = 1;
2320   newObject->dirty = FALSE;
2321   newObject->running_object = NULL;
2322
2323   return newObject;
2324 }
2325
2326 /******************************************************************************
2327  *              CreateDataCache        [OLE32.@]
2328  *
2329  * Creates a data cache to allow an object to render one or more of its views,
2330  * whether running or not.
2331  *
2332  * PARAMS
2333  *  pUnkOuter [I] Outer unknown for the object.
2334  *  rclsid    [I]
2335  *  riid      [I] IID of interface to return.
2336  *  ppvObj    [O] Address where the data cache object will be stored on return.
2337  *
2338  * RETURNS
2339  *  Success: S_OK.
2340  *  Failure: HRESULT code.
2341  *
2342  * NOTES
2343  *  The following interfaces are supported by the returned data cache object:
2344  *  IOleCache, IOleCache2, IOleCacheControl, IPersistStorage, IDataObject,
2345  *  IViewObject and IViewObject2.
2346  */
2347 HRESULT WINAPI CreateDataCache(
2348   LPUNKNOWN pUnkOuter,
2349   REFCLSID  rclsid,
2350   REFIID    riid,
2351   LPVOID*   ppvObj)
2352 {
2353   DataCache* newCache = NULL;
2354   HRESULT    hr       = S_OK;
2355
2356   TRACE("(%s, %p, %s, %p)\n", debugstr_guid(rclsid), pUnkOuter, debugstr_guid(riid), ppvObj);
2357
2358   /*
2359    * Sanity check
2360    */
2361   if (ppvObj==0)
2362     return E_POINTER;
2363
2364   *ppvObj = 0;
2365
2366   /*
2367    * If this cache is constructed for aggregation, make sure
2368    * the caller is requesting the IUnknown interface.
2369    * This is necessary because it's the only time the non-delegating
2370    * IUnknown pointer can be returned to the outside.
2371    */
2372   if ( pUnkOuter && !IsEqualIID(&IID_IUnknown, riid) )
2373     return CLASS_E_NOAGGREGATION;
2374
2375   /*
2376    * Try to construct a new instance of the class.
2377    */
2378   newCache = DataCache_Construct(rclsid,
2379                                  pUnkOuter);
2380
2381   if (newCache == 0)
2382     return E_OUTOFMEMORY;
2383
2384   /*
2385    * Make sure it supports the interface required by the caller.
2386    */
2387   hr = IUnknown_QueryInterface(&newCache->IUnknown_iface, riid, ppvObj);
2388
2389   /*
2390    * Release the reference obtained in the constructor. If
2391    * the QueryInterface was unsuccessful, it will free the class.
2392    */
2393   IUnknown_Release(&newCache->IUnknown_iface);
2394
2395   return hr;
2396 }