windowscodecs: Add WICIfdMetadataReader stub implementation.

dlls/windowscodecs/clsfactory.c

@@ -60,6 +60,7 @@ static classinfo wic_classes[] = {
     {&CLSID_WICDefaultFormatConverter, FormatConverter_CreateInstance},
     {&CLSID_WineTgaDecoder, TgaDecoder_CreateInstance},
     {&CLSID_WICUnknownMetadataReader, UnknownMetadataReader_CreateInstance},
+    {&CLSID_WICIfdMetadataReader, IfdMetadataReader_CreateInstance},
     {0}};
 
 typedef struct {

dlls/windowscodecs/metadatahandler.c

@@ -325,7 +325,7 @@ static const IWICPersistStreamVtbl MetadataHandler_PersistStream_Vtbl = {
     MetadataHandler_SaveEx
 };
 
-HRESULT MetadataReader_Create(const MetadataHandlerVtbl *vtable, IUnknown *pUnkOuter, REFIID iid, void** ppv)
+static HRESULT MetadataReader_Create(const MetadataHandlerVtbl *vtable, IUnknown *pUnkOuter, REFIID iid, void** ppv)
 {
     MetadataHandler *This;
     HRESULT hr;
@@ -597,3 +597,25 @@ HRESULT UnknownMetadataReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, vo
 {
     return MetadataReader_Create(&UnknownMetadataReader_Vtbl, pUnkOuter, iid, ppv);
 }
+
+static HRESULT LoadIfdMetadata(IStream *input, const GUID *preferred_vendor,
+    DWORD persist_options, MetadataItem **items, DWORD *item_count)
+{
+    FIXME("stub\n");
+
+    *items = NULL;
+    *item_count = 0;
+
+    return S_OK;
+}
+
+static const MetadataHandlerVtbl IfdMetadataReader_Vtbl = {
+    0,
+    &CLSID_WICIfdMetadataReader,
+    LoadIfdMetadata
+};
+
+HRESULT IfdMetadataReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void **ppv)
+{
+    return MetadataReader_Create(&IfdMetadataReader_Vtbl, pUnkOuter, iid, ppv);
+}

dlls/windowscodecs/wincodecs_private.h

@@ -84,8 +84,7 @@ typedef struct _MetadataHandlerVtbl
         ULARGE_INTEGER *size);
 } MetadataHandlerVtbl;
 
-extern HRESULT MetadataReader_Create(const MetadataHandlerVtbl *vtable, IUnknown *pUnkOuter, REFIID iid, void** ppv) DECLSPEC_HIDDEN;
-
 extern HRESULT UnknownMetadataReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void** ppv) DECLSPEC_HIDDEN;
+extern HRESULT IfdMetadataReader_CreateInstance(IUnknown *pUnkOuter, REFIID iid, void **ppv) DECLSPEC_HIDDEN;
 
 #endif /* WINCODECS_PRIVATE_H */