dlls/windowscodecs/metadatahandler.c

   1 /*
   2  * Copyright 2012 Vincent Povirk for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdarg.h>
  22
  23 #define COBJMACROS
  24 #define NONAMELESSUNION
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "objbase.h"
  29 #include "wincodec.h"
  30 #include "wincodecsdk.h"
  31
  32 #include "wincodecs_private.h"
  33
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  37
  38 typedef struct MetadataHandler {
  39     IWICMetadataWriter IWICMetadataWriter_iface;
  40     LONG ref;
  41     IWICPersistStream IWICPersistStream_iface;
  42     const MetadataHandlerVtbl *vtable;
  43     MetadataItem *items;
  44     DWORD item_count;
  45     CRITICAL_SECTION lock;
  46 } MetadataHandler;
  47
  48 static inline MetadataHandler *impl_from_IWICMetadataWriter(IWICMetadataWriter *iface)
  49 {
  50     return CONTAINING_RECORD(iface, MetadataHandler, IWICMetadataWriter_iface);
  51 }
  52
  53 static inline MetadataHandler *impl_from_IWICPersistStream(IWICPersistStream *iface)
  54 {
  55     return CONTAINING_RECORD(iface, MetadataHandler, IWICPersistStream_iface);
  56 }
  57
  58 static void MetadataHandler_FreeItems(MetadataHandler *This)
  59 {
  60     int i;
  61
  62     for (i=0; i<This->item_count; i++)
  63     {
  64         PropVariantClear(&This->items[i].schema);
  65         PropVariantClear(&This->items[i].id);
  66         PropVariantClear(&This->items[i].value);
  67     }
  68
  69     HeapFree(GetProcessHeap(), 0, This->items);
  70 }
  71
  72 static HRESULT MetadataHandlerEnum_Create(MetadataHandler *parent, DWORD index,
  73     IWICEnumMetadataItem **ppIEnumMetadataItem);
  74
  75 static HRESULT WINAPI MetadataHandler_QueryInterface(IWICMetadataWriter *iface, REFIID iid,
  76     void **ppv)
  77 {
  78     MetadataHandler *This = impl_from_IWICMetadataWriter(iface);
  79     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
  80
  81     if (!ppv) return E_INVALIDARG;
  82
  83     if (IsEqualIID(&IID_IUnknown, iid) ||
  84         IsEqualIID(&IID_IWICMetadataReader, iid) ||
  85         (IsEqualIID(&IID_IWICMetadataWriter, iid) && This->vtable->is_writer))
  86     {
  87         *ppv = &This->IWICMetadataWriter_iface;
  88     }
  89     else if (IsEqualIID(&IID_IPersist, iid) ||
  90              IsEqualIID(&IID_IPersistStream, iid) ||
  91              IsEqualIID(&IID_IWICPersistStream, iid))
  92     {
  93         *ppv = &This->IWICPersistStream_iface;
  94     }
  95     else
  96     {
  97         *ppv = NULL;
  98         return E_NOINTERFACE;
  99     }
 100
 101     IUnknown_AddRef((IUnknown*)*ppv);
 102     return S_OK;
 103 }
 104
 105 static ULONG WINAPI MetadataHandler_AddRef(IWICMetadataWriter *iface)
 106 {
 107     MetadataHandler *This = impl_from_IWICMetadataWriter(iface);
 108     ULONG ref = InterlockedIncrement(&This->ref);
 109
 110     TRACE("(%p) refcount=%u\n", iface, ref);
 111
 112     return ref;
 113 }
 114
 115 static ULONG WINAPI MetadataHandler_Release(IWICMetadataWriter *iface)
 116 {
 117     MetadataHandler *This = impl_from_IWICMetadataWriter(iface);
 118     ULONG ref = InterlockedDecrement(&This->ref);
 119
 120     TRACE("(%p) refcount=%u\n", iface, ref);
 121
 122     if (ref == 0)
 123     {
 124         MetadataHandler_FreeItems(This);
 125         This->lock.DebugInfo->Spare[0] = 0;
 126         DeleteCriticalSection(&This->lock);
 127         HeapFree(GetProcessHeap(), 0, This);
 128     }
 129
 130     return ref;
 131 }
 132
 133 static HRESULT WINAPI MetadataHandler_GetMetadataFormat(IWICMetadataWriter *iface,
 134     GUID *pguidMetadataFormat)
 135 {
 136     if (!pguidMetadataFormat) return E_INVALIDARG;
 137
 138     FIXME("(%p,%s): stub\n", iface, debugstr_guid(pguidMetadataFormat));
 139     return E_NOTIMPL;
 140 }
 141
 142 static HRESULT WINAPI MetadataHandler_GetMetadataHandlerInfo(IWICMetadataWriter *iface,
 143     IWICMetadataHandlerInfo **ppIHandler)
 144 {
 145     FIXME("(%p,%p): stub\n", iface, ppIHandler);
 146     return E_NOTIMPL;
 147 }
 148
 149 static HRESULT WINAPI MetadataHandler_GetCount(IWICMetadataWriter *iface,
 150     UINT *pcCount)
 151 {
 152     MetadataHandler *This = impl_from_IWICMetadataWriter(iface);
 153
 154     TRACE("%p,%p\n", iface, pcCount);
 155
 156     if (!pcCount) return E_INVALIDARG;
 157
 158     *pcCount = This->item_count;
 159     return S_OK;
 160 }
 161
 162 static HRESULT WINAPI MetadataHandler_GetValueByIndex(IWICMetadataWriter *iface,
 163     UINT nIndex, PROPVARIANT *pvarSchema, PROPVARIANT *pvarId, PROPVARIANT *pvarValue)
 164 {
 165     FIXME("(%p,%u,%p,%p,%p): stub\n", iface, nIndex, pvarSchema, pvarId, pvarValue);
 166     return E_NOTIMPL;
 167 }
 168
 169 static HRESULT WINAPI MetadataHandler_GetValue(IWICMetadataWriter *iface,
 170     const PROPVARIANT *pvarSchema, const PROPVARIANT *pvarId, PROPVARIANT *pvarValue)
 171 {
 172     FIXME("(%p,%p,%p,%p): stub\n", iface, pvarSchema, pvarId, pvarValue);
 173     return E_NOTIMPL;
 174 }
 175
 176 static HRESULT WINAPI MetadataHandler_GetEnumerator(IWICMetadataWriter *iface,
 177     IWICEnumMetadataItem **ppIEnumMetadata)
 178 {
 179     MetadataHandler *This = impl_from_IWICMetadataWriter(iface);
 180     TRACE("(%p,%p)\n", iface, ppIEnumMetadata);
 181     return MetadataHandlerEnum_Create(This, 0, ppIEnumMetadata);
 182 }
 183
 184 static HRESULT WINAPI MetadataHandler_SetValue(IWICMetadataWriter *iface,
 185     const PROPVARIANT *pvarSchema, const PROPVARIANT *pvarId, const PROPVARIANT *pvarValue)
 186 {
 187     FIXME("(%p,%p,%p,%p): stub\n", iface, pvarSchema, pvarId, pvarValue);
 188     return E_NOTIMPL;
 189 }
 190
 191 static HRESULT WINAPI MetadataHandler_SetValueByIndex(IWICMetadataWriter *iface,
 192     UINT nIndex, const PROPVARIANT *pvarSchema, const PROPVARIANT *pvarId, const PROPVARIANT *pvarValue)
 193 {
 194     FIXME("(%p,%u,%p,%p,%p): stub\n", iface, nIndex, pvarSchema, pvarId, pvarValue);
 195     return E_NOTIMPL;
 196 }
 197
 198 static HRESULT WINAPI MetadataHandler_RemoveValue(IWICMetadataWriter *iface,
 199     const PROPVARIANT *pvarSchema, const PROPVARIANT *pvarId)
 200 {
 201     FIXME("(%p,%p,%p): stub\n", iface, pvarSchema, pvarId);
 202     return E_NOTIMPL;
 203 }
 204
 205 static HRESULT WINAPI MetadataHandler_RemoveValueByIndex(IWICMetadataWriter *iface,
 206     UINT nIndex)
 207 {
 208     FIXME("(%p,%u): stub\n", iface, nIndex);
 209     return E_NOTIMPL;
 210 }
 211
 212 static const IWICMetadataWriterVtbl MetadataHandler_Vtbl = {
 213     MetadataHandler_QueryInterface,
 214     MetadataHandler_AddRef,
 215     MetadataHandler_Release,
 216     MetadataHandler_GetMetadataFormat,
 217     MetadataHandler_GetMetadataHandlerInfo,
 218     MetadataHandler_GetCount,
 219     MetadataHandler_GetValueByIndex,
 220     MetadataHandler_GetValue,
 221     MetadataHandler_GetEnumerator,
 222     MetadataHandler_SetValue,
 223     MetadataHandler_SetValueByIndex,
 224     MetadataHandler_RemoveValue,
 225     MetadataHandler_RemoveValueByIndex
 226 };
 227
 228 static HRESULT WINAPI MetadataHandler_PersistStream_QueryInterface(IWICPersistStream *iface,
 229     REFIID iid, void **ppv)
 230 {
 231     MetadataHandler *This = impl_from_IWICPersistStream(iface);
 232     return IWICMetadataWriter_QueryInterface(&This->IWICMetadataWriter_iface, iid, ppv);
 233 }
 234
 235 static ULONG WINAPI MetadataHandler_PersistStream_AddRef(IWICPersistStream *iface)
 236 {
 237     MetadataHandler *This = impl_from_IWICPersistStream(iface);
 238     return IWICMetadataWriter_AddRef(&This->IWICMetadataWriter_iface);
 239 }
 240
 241 static ULONG WINAPI MetadataHandler_PersistStream_Release(IWICPersistStream *iface)
 242 {
 243     MetadataHandler *This = impl_from_IWICPersistStream(iface);
 244     return IWICMetadataWriter_Release(&This->IWICMetadataWriter_iface);
 245 }
 246
 247 static HRESULT WINAPI MetadataHandler_GetClassID(IWICPersistStream *iface,
 248     CLSID *pClassID)
 249 {
 250     FIXME("(%p,%p): stub\n", iface, pClassID);
 251     return E_NOTIMPL;
 252 }
 253
 254 static HRESULT WINAPI MetadataHandler_IsDirty(IWICPersistStream *iface)
 255 {
 256     FIXME("(%p): stub\n", iface);
 257     return E_NOTIMPL;
 258 }
 259
 260 static HRESULT WINAPI MetadataHandler_Load(IWICPersistStream *iface,
 261     IStream *pStm)
 262 {
 263     FIXME("(%p,%p): stub\n", iface, pStm);
 264     return E_NOTIMPL;
 265 }
 266
 267 static HRESULT WINAPI MetadataHandler_Save(IWICPersistStream *iface,
 268     IStream *pStm, BOOL fClearDirty)
 269 {
 270     FIXME("(%p,%p,%i): stub\n", iface, pStm, fClearDirty);
 271     return E_NOTIMPL;
 272 }
 273
 274 static HRESULT WINAPI MetadataHandler_GetSizeMax(IWICPersistStream *iface,
 275     ULARGE_INTEGER *pcbSize)
 276 {
 277     FIXME("(%p,%p): stub\n", iface, pcbSize);
 278     return E_NOTIMPL;
 279 }
 280
 281 static HRESULT WINAPI MetadataHandler_LoadEx(IWICPersistStream *iface,
 282     IStream *pIStream, const GUID *pguidPreferredVendor, DWORD dwPersistOptions)
 283 {
 284     MetadataHandler *This = impl_from_IWICPersistStream(iface);
 285     HRESULT hr;
 286     MetadataItem *new_items=NULL;
 287     DWORD item_count=0;
 288
 289     TRACE("(%p,%p,%s,%x)\n", iface, pIStream, debugstr_guid(pguidPreferredVendor), dwPersistOptions);
 290
 291     EnterCriticalSection(&This->lock);
 292
 293     hr = This->vtable->fnLoad(pIStream, pguidPreferredVendor, dwPersistOptions,
 294         &new_items, &item_count);
 295
 296     if (SUCCEEDED(hr))
 297     {
 298         MetadataHandler_FreeItems(This);
 299         This->items = new_items;
 300         This->item_count = item_count;
 301     }
 302
 303     LeaveCriticalSection(&This->lock);
 304
 305     return hr;
 306 }
 307
 308 static HRESULT WINAPI MetadataHandler_SaveEx(IWICPersistStream *iface,
 309     IStream *pIStream, DWORD dwPersistOptions, BOOL fClearDirty)
 310 {
 311     FIXME("(%p,%p,%x,%i): stub\n", iface, pIStream, dwPersistOptions, fClearDirty);
 312     return E_NOTIMPL;
 313 }
 314
 315 static const IWICPersistStreamVtbl MetadataHandler_PersistStream_Vtbl = {
 316     MetadataHandler_PersistStream_QueryInterface,
 317     MetadataHandler_PersistStream_AddRef,
 318     MetadataHandler_PersistStream_Release,
 319     MetadataHandler_GetClassID,
 320     MetadataHandler_IsDirty,
 321     MetadataHandler_Load,
 322     MetadataHandler_Save,
 323     MetadataHandler_GetSizeMax,
 324     MetadataHandler_LoadEx,
 325     MetadataHandler_SaveEx
 326 };
 327
 328 HRESULT MetadataReader_Create(const MetadataHandlerVtbl *vtable, IUnknown *pUnkOuter, REFIID iid, void** ppv)
 329 {
 330     MetadataHandler *This;
 331     HRESULT hr;
 332
 333     TRACE("%s\n", debugstr_guid(vtable->clsid));
 334
 335     *ppv = NULL;
 336
 337     if (pUnkOuter) return CLASS_E_NOAGGREGATION;
 338
 339     This = HeapAlloc(GetProcessHeap(), 0, sizeof(MetadataHandler));
 340     if (!This) return E_OUTOFMEMORY;
 341
 342     This->IWICMetadataWriter_iface.lpVtbl = &MetadataHandler_Vtbl;
 343     This->IWICPersistStream_iface.lpVtbl = &MetadataHandler_PersistStream_Vtbl;
 344     This->ref = 1;
 345     This->vtable = vtable;
 346     This->items = NULL;
 347     This->item_count = 0;
 348
 349     InitializeCriticalSection(&This->lock);
 350     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": MetadataHandler.lock");
 351
 352     hr = IWICMetadataWriter_QueryInterface(&This->IWICMetadataWriter_iface, iid, ppv);
 353
 354     IWICMetadataWriter_Release(&This->IWICMetadataWriter_iface);
 355
 356     return hr;
 357 }
 358
 359 typedef struct MetadataHandlerEnum {
 360     IWICEnumMetadataItem IWICEnumMetadataItem_iface;
 361     LONG ref;
 362     MetadataHandler *parent;
 363     DWORD index;
 364 } MetadataHandlerEnum;
 365
 366 static inline MetadataHandlerEnum *impl_from_IWICEnumMetadataItem(IWICEnumMetadataItem *iface)
 367 {
 368     return CONTAINING_RECORD(iface, MetadataHandlerEnum, IWICEnumMetadataItem_iface);
 369 }
 370
 371 static HRESULT WINAPI MetadataHandlerEnum_QueryInterface(IWICEnumMetadataItem *iface, REFIID iid,
 372     void **ppv)
 373 {
 374     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 375     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 376
 377     if (!ppv) return E_INVALIDARG;
 378
 379     if (IsEqualIID(&IID_IUnknown, iid) ||
 380         IsEqualIID(&IID_IWICEnumMetadataItem, iid))
 381     {
 382         *ppv = &This->IWICEnumMetadataItem_iface;
 383     }
 384     else
 385     {
 386         *ppv = NULL;
 387         return E_NOINTERFACE;
 388     }
 389
 390     IUnknown_AddRef((IUnknown*)*ppv);
 391     return S_OK;
 392 }
 393
 394 static ULONG WINAPI MetadataHandlerEnum_AddRef(IWICEnumMetadataItem *iface)
 395 {
 396     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 397     ULONG ref = InterlockedIncrement(&This->ref);
 398
 399     TRACE("(%p) refcount=%u\n", iface, ref);
 400
 401     return ref;
 402 }
 403
 404 static ULONG WINAPI MetadataHandlerEnum_Release(IWICEnumMetadataItem *iface)
 405 {
 406     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 407     ULONG ref = InterlockedDecrement(&This->ref);
 408
 409     TRACE("(%p) refcount=%u\n", iface, ref);
 410
 411     if (ref == 0)
 412     {
 413         IWICMetadataWriter_Release(&This->parent->IWICMetadataWriter_iface);
 414         HeapFree(GetProcessHeap(), 0, This);
 415     }
 416
 417     return ref;
 418 }
 419
 420 static HRESULT WINAPI MetadataHandlerEnum_Next(IWICEnumMetadataItem *iface,
 421     ULONG celt, PROPVARIANT *rgeltSchema, PROPVARIANT *rgeltId,
 422     PROPVARIANT *rgeltValue, ULONG *pceltFetched)
 423 {
 424     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 425     ULONG new_index;
 426     HRESULT hr=S_FALSE;
 427     int i;
 428
 429     TRACE("(%p,%i)\n", iface, celt);
 430
 431     EnterCriticalSection(&This->parent->lock);
 432
 433     if (This->index >= This->parent->item_count)
 434     {
 435         *pceltFetched = 0;
 436         LeaveCriticalSection(&This->parent->lock);
 437         return S_FALSE;
 438     }
 439
 440     new_index = min(This->parent->item_count, This->index + celt);
 441     *pceltFetched = new_index - This->index;
 442
 443     if (rgeltSchema)
 444     {
 445         for (i=0; SUCCEEDED(hr) && i < *pceltFetched; i++)
 446             hr = PropVariantCopy(&rgeltSchema[i], &This->parent->items[i+This->index].schema);
 447     }
 448
 449     for (i=0; SUCCEEDED(hr) && i < *pceltFetched; i++)
 450         hr = PropVariantCopy(&rgeltId[i], &This->parent->items[i+This->index].id);
 451
 452     if (rgeltValue)
 453     {
 454         for (i=0; SUCCEEDED(hr) && i < *pceltFetched; i++)
 455             hr = PropVariantCopy(&rgeltValue[i], &This->parent->items[i+This->index].value);
 456     }
 457
 458     if (SUCCEEDED(hr))
 459     {
 460         This->index = new_index;
 461     }
 462
 463     LeaveCriticalSection(&This->parent->lock);
 464
 465     return hr;
 466 }
 467
 468 static HRESULT WINAPI MetadataHandlerEnum_Skip(IWICEnumMetadataItem *iface,
 469     ULONG celt)
 470 {
 471     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 472
 473     EnterCriticalSection(&This->parent->lock);
 474
 475     This->index += celt;
 476
 477     LeaveCriticalSection(&This->parent->lock);
 478
 479     return S_OK;
 480 }
 481
 482 static HRESULT WINAPI MetadataHandlerEnum_Reset(IWICEnumMetadataItem *iface)
 483 {
 484     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 485
 486     EnterCriticalSection(&This->parent->lock);
 487
 488     This->index = 0;
 489
 490     LeaveCriticalSection(&This->parent->lock);
 491
 492     return S_OK;
 493 }
 494
 495 static HRESULT WINAPI MetadataHandlerEnum_Clone(IWICEnumMetadataItem *iface,
 496     IWICEnumMetadataItem **ppIEnumMetadataItem)
 497 {
 498     MetadataHandlerEnum *This = impl_from_IWICEnumMetadataItem(iface);
 499     HRESULT hr;
 500
 501     EnterCriticalSection(&This->parent->lock);
 502
 503     hr = MetadataHandlerEnum_Create(This->parent, This->index, ppIEnumMetadataItem);
 504
 505     LeaveCriticalSection(&This->parent->lock);
 506
 507     return hr;
 508 }
 509
 510 static const IWICEnumMetadataItemVtbl MetadataHandlerEnum_Vtbl = {
 511     MetadataHandlerEnum_QueryInterface,
 512     MetadataHandlerEnum_AddRef,
 513     MetadataHandlerEnum_Release,
 514     MetadataHandlerEnum_Next,
 515     MetadataHandlerEnum_Skip,
 516     MetadataHandlerEnum_Reset,
 517     MetadataHandlerEnum_Clone
 518 };
 519
 520 static HRESULT MetadataHandlerEnum_Create(MetadataHandler *parent, DWORD index,
 521     IWICEnumMetadataItem **ppIEnumMetadataItem)
 522 {
 523     MetadataHandlerEnum *This;
 524
 525     if (!ppIEnumMetadataItem) return E_INVALIDARG;
 526
 527     *ppIEnumMetadataItem = NULL;
 528
 529     This = HeapAlloc(GetProcessHeap(), 0, sizeof(MetadataHandlerEnum));
 530     if (!This) return E_OUTOFMEMORY;
 531
 532     IWICMetadataWriter_AddRef(&parent->IWICMetadataWriter_iface);
 533
 534     This->IWICEnumMetadataItem_iface.lpVtbl = &MetadataHandlerEnum_Vtbl;
 535     This->ref = 1;
 536     This->parent = parent;
 537     This->index = index;
 538
 539     *ppIEnumMetadataItem = &This->IWICEnumMetadataItem_iface;
 540
 541     return S_OK;
 542 }
 543
 544 static HRESULT LoadUnknownMetadata(IStream *input, const GUID *preferred_vendor,
 545     DWORD persist_options, MetadataItem **items, DWORD *item_count)
 546 {
 547     HRESULT hr;
 548     MetadataItem *result;
 549     STATSTG stat;
 550     BYTE *data;
 551     ULONG bytesread;
 552
 553     TRACE("\n");
 554
 555     hr = IStream_Stat(input, &stat, STATFLAG_NONAME);
 556     if (FAILED(hr))
 557         return hr;
 558
 559     data = HeapAlloc(GetProcessHeap(), 0, stat.cbSize.QuadPart);
 560     if (!data) return E_OUTOFMEMORY;
 561
 562     hr = IStream_Read(input, data, stat.cbSize.QuadPart, &bytesread);
 563     if (FAILED(hr))
 564     {
 565         HeapFree(GetProcessHeap(), 0, data);
 566         return hr;
 567     }
 568
 569     result = HeapAlloc(GetProcessHeap(), 0, sizeof(MetadataItem));
 570     if (!result)
 571     {
 572         HeapFree(GetProcessHeap(), 0, data);
 573         return E_OUTOFMEMORY;
 574     }
 575
 576     PropVariantInit(&result[0].schema);
 577     PropVariantInit(&result[0].id);
 578     PropVariantInit(&result[0].value);
 579
 580     result[0].value.vt = VT_BLOB;
 581     result[0].value.u.blob.cbSize = bytesread;
 582     result[0].value.u.blob.pBlobData = data;
 583
 584     *items = result;
 585     *item_count = 1;
 586
 587     return S_OK;
 588 }
 589
 590 static const MetadataHandlerVtbl UnknownMetadataReader_Vtbl = {
 591     0,
 592     &CLSID_WICUnknownMetadataReader,
 593     LoadUnknownMetadata
 594 };
 595
 596 HRESULT UnknownMetadataReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv)
 597 {
 598     return MetadataReader_Create(&UnknownMetadataReader_Vtbl, pUnkOuter, iid, ppv);
 599 }