[PATCH 5/5] windowscodecs: Implement CreateMetadataReader().

[Nikolay Sivov]

From: Nikolay Sivov

Signed-off-by: Nikolay Sivov 
---
 dlls/windowscodecs/imgfactory.c     | 96 ++++++++++++++++++++++++++++-
 dlls/windowscodecs/tests/metadata.c | 32 +++++-----
 2 files changed, 109 insertions(+), 19 deletions(-)

diff --git a/dlls/windowscodecs/imgfactory.c b/dlls/windowscodecs/imgfactory.c
index 676d24134c4..2f5617cedc1 100644
--- a/dlls/windowscodecs/imgfactory.c
+++ b/dlls/windowscodecs/imgfactory.c
@@ -1322,6 +1322,71 @@ static enum iterator_result create_metadata_reader_from_container_iterator(IUnkn
     return ITER_SKIP;
 }

+static enum iterator_result create_metadata_reader_iterator(IUnknown *item,
+        struct iterator_context *context)
+{
+    IWICPersistStream *persist_stream = NULL;
+    IWICMetadataReaderInfo *readerinfo;
+    IWICMetadataReader *reader = NULL;
+    LARGE_INTEGER zero = {{0}};
+    HRESULT hr;
+    GUID guid;
+
+    if (FAILED(IUnknown_QueryInterface(item, &IID_IWICMetadataReaderInfo, (void **)&readerinfo)))
+        return ITER_SKIP;
+
+    if (context->vendor)
+    {
+        hr = IWICMetadataReaderInfo_GetVendorGUID(readerinfo, &guid);
+
+        if (FAILED(hr) || !IsEqualIID(context->vendor, &guid))
+        {
+            IWICMetadataReaderInfo_Release(readerinfo);
+            return ITER_SKIP;
+        }
+    }
+
+    hr = IWICMetadataReaderInfo_GetMetadataFormat(readerinfo, &guid);
+
+    if (FAILED(hr) || !IsEqualIID(context->format, &guid))
+    {
+        IWICMetadataReaderInfo_Release(readerinfo);
+        return ITER_SKIP;
+    }
+
+    if (SUCCEEDED(hr))
+        hr = IWICMetadataReaderInfo_CreateInstance(readerinfo, &reader);
+
+    IWICMetadataReaderInfo_Release(readerinfo);
+
+    if (context->stream)
+    {
+        if (SUCCEEDED(hr))
+            hr = IStream_Seek(context->stream, zero, STREAM_SEEK_SET, NULL);
+
+        if (SUCCEEDED(hr))
+            hr = IWICMetadataReader_QueryInterface(reader, &IID_IWICPersistStream, (void **)&persist_stream);
+
+        if (SUCCEEDED(hr))
+            hr = IWICPersistStream_LoadEx(persist_stream, context->stream, context->vendor,
+                    context->options & WICPersistOptionMask);
+
+        if (persist_stream)
+            IWICPersistStream_Release(persist_stream);
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        *context->result = reader;
+        return ITER_DONE;
+    }
+
+    if (reader)
+        IWICMetadataReader_Release(reader);
+
+    return ITER_SKIP;
+}
+
 static HRESULT foreach_component(DWORD mask, iterator_func func, struct iterator_context *context)
 {
     enum iterator_result ret;
@@ -1382,9 +1447,36 @@ static HRESULT create_unknown_metadata_reader(IStream *stream, DWORD options, IW
 static HRESULT WINAPI ComponentFactory_CreateMetadataReader(IWICComponentFactory *iface,
         REFGUID format, const GUID *vendor, DWORD options, IStream *stream, IWICMetadataReader **reader)
 {
-    FIXME("%p,%s,%s,%lx,%p,%p: stub\n", iface, debugstr_guid(format), debugstr_guid(vendor),
+    struct iterator_context context = { 0 };
+    HRESULT hr;
+
+    TRACE("%p,%s,%s,%lx,%p,%p\n", iface, debugstr_guid(format), debugstr_guid(vendor),
         options, stream, reader);
-    return E_NOTIMPL;
+
+    if (!format || !reader)
+        return E_INVALIDARG;
+
+    context.format = format;
+    context.vendor = vendor;
+    context.options = options;
+    context.stream = stream;
+    context.result = (void **)reader;
+
+    hr = foreach_component(WICMetadataReader, create_metadata_reader_iterator, &context);
+
+    if (FAILED(hr) && vendor)
+    {
+        context.vendor = NULL;
+        hr = foreach_component(WICMetadataReader, create_metadata_reader_iterator, &context);
+    }
+
+    if (FAILED(hr))
+        WARN("Failed to create a metadata reader instance, hr %#lx.\n", hr);
+
+    if (!*reader && !(options & WICMetadataCreationFailUnknown))
+        hr = create_unknown_metadata_reader(stream, options, reader);
+
+    return *reader ? S_OK : WINCODEC_ERR_COMPONENTNOTFOUND;
 }

static HRESULT WINAPI ComponentFactory_CreateMetadataReaderFromContainer(IWICComponentFactory *iface,
diff --git a/dlls/windowscodecs/tests/metadata.c b/dlls/windowscodecs/tests/metadata.c
index 31c17ddcad1..9764baab827 100644
--- a/dlls/windowscodecs/tests/metadata.c
+++ b/dlls/windowscodecs/tests/metadata.c
@@ -1405,62 +1405,51 @@ static void test_create_reader(void)
     stream = create_stream(metadata_tEXt, sizeof(metadata_tEXt));

hr = IWICComponentFactory_CreateMetadataReader(factory, NULL, NULL, 0, stream, &reader);
-    todo_wine
     ok(hr == E_INVALIDARG, "Unexpected hr %#lx.\n", hr);

memset(&format, 0xcc, sizeof(format));
     hr = IWICComponentFactory_CreateMetadataReader(factory, &format, NULL, 0, stream, &reader);
-    todo_wine
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
-if (SUCCEEDED(hr))
-{
+
     hr = IWICMetadataReader_GetMetadataFormat(reader, &format);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
     ok(IsEqualGUID(&format, &GUID_MetadataFormatUnknown), "Unexpected format %s.\n", wine_dbgstr_guid(&format));
     IWICMetadataReader_Release(reader);
-}

memset(&format, 0xcc, sizeof(format));
     hr = IWICComponentFactory_CreateMetadataReader(factory, &format, NULL, WICMetadataCreationFailUnknown, stream, &reader);
-    todo_wine
     ok(hr == WINCODEC_ERR_COMPONENTNOTFOUND, "Unexpected hr %#lx.\n", hr);

hr = IWICComponentFactory_CreateMetadataReader(factory, &GUID_MetadataFormatChunktEXt,
             NULL, 0, NULL, &reader);
-    todo_wine
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
-if (SUCCEEDED(hr))
-{
+
     hr = IWICMetadataReader_GetMetadataFormat(reader, &format);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
     ok(IsEqualGUID(&format, &GUID_MetadataFormatChunktEXt), "Unexpected format %s.\n", wine_dbgstr_guid(&format));
     IWICMetadataReader_Release(reader);
-}

pos.QuadPart = 0;
     hr = IStream_Seek(stream, pos, STREAM_SEEK_SET, NULL);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
     hr = IWICComponentFactory_CreateMetadataReader(factory, &GUID_MetadataFormatChunktEXt, NULL, 0,
             stream, NULL);
-    todo_wine
     ok(hr == E_INVALIDARG, "Unexpected hr %#lx.\n", hr);

hr = IStream_Seek(stream, pos, STREAM_SEEK_SET, NULL);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
     hr = IWICComponentFactory_CreateMetadataReader(factory, &GUID_ContainerFormatPng, NULL, 0, stream, &reader);
-    todo_wine
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
-if (SUCCEEDED(hr))
+    hr = IWICMetadataReader_GetMetadataFormat(reader, &format);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+    ok(IsEqualGUID(&format, &GUID_MetadataFormatUnknown), "Unexpected format %s.\n", wine_dbgstr_guid(&format));
     IWICMetadataReader_Release(reader);

hr = IStream_Seek(stream, pos, STREAM_SEEK_SET, NULL);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
     hr = IWICComponentFactory_CreateMetadataReader(factory, &GUID_MetadataFormatChunktEXt, NULL, 0, stream, &reader);
-    todo_wine
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);

-if (SUCCEEDED(hr))
-{
     check_interface(reader, &IID_IWICMetadataReader, TRUE);
     check_interface(reader, &IID_IWICMetadataWriter, FALSE);
     check_interface(reader, &IID_IPersist, TRUE);
@@ -1477,7 +1466,16 @@ if (SUCCEEDED(hr))
     ok(IsEqualGUID(&format, &GUID_MetadataFormatChunktEXt), "Unexpected format %s.\n", wine_dbgstr_guid(&format));

IWICMetadataReader_Release(reader);
-}
+
+    /* Invalid vendor. */
+    hr = IStream_Seek(stream, pos, STREAM_SEEK_SET, NULL);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+    hr = IWICComponentFactory_CreateMetadataReader(factory, &GUID_MetadataFormatChunktEXt, &IID_IUnknown, 0, stream, &reader);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+    hr = IWICMetadataReader_GetMetadataFormat(reader, &format);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+    ok(IsEqualGUID(&format, &GUID_MetadataFormatChunktEXt), "Unexpected format %s.\n", wine_dbgstr_guid(&format));
+    IWICMetadataReader_Release(reader);

/* Mismatching metadata format. */
     hr = IStream_Seek(stream, pos, STREAM_SEEK_SET, NULL);