[PATCH 2/5] windowscodecs/metadata: Create default item for the hIST handler.

[Nikolay Sivov]

From: Nikolay Sivov

Signed-off-by: Nikolay Sivov 
---
 dlls/windowscodecs/pngformat.c      | 55 ++++++++++++++++++++---------
 dlls/windowscodecs/tests/metadata.c |  9 ++++-
 2 files changed, 46 insertions(+), 18 deletions(-)

diff --git a/dlls/windowscodecs/pngformat.c b/dlls/windowscodecs/pngformat.c
index 7a1c72b231f..91a9ee0de22 100644
--- a/dlls/windowscodecs/pngformat.c
+++ b/dlls/windowscodecs/pngformat.c
@@ -294,6 +294,27 @@ HRESULT PngChrmReader_CreateInstance(REFIID iid, void** ppv)
     return MetadataReader_Create(&ChrmReader_Vtbl, iid, ppv);
 }

+static HRESULT create_hist_item(USHORT *data, ULONG count, MetadataItem **item)
+{
+    HRESULT hr;
+
+    if (!(*item = calloc(1, sizeof(**item))))
+        return E_OUTOFMEMORY;
+
+    hr = init_propvar_from_string(L"Frequencies", &(*item)->id);
+    if (FAILED(hr))
+    {
+        free(*item);
+        return hr;
+    }
+
+    (*item)->value.vt = VT_UI2 | VT_VECTOR;
+    (*item)->value.caui.cElems = count;
+    (*item)->value.caui.pElems = data;
+
+    return S_OK;
+}
+
 static HRESULT LoadHistMetadata(MetadataHandler *handler, IStream *stream, const GUID *preferred_vendor,
     DWORD persist_options)
 {
@@ -301,7 +322,6 @@ static HRESULT LoadHistMetadata(MetadataHandler *handler, IStream *stream, const
     BYTE type[4];
     BYTE *data;
     ULONG data_size, element_count, i;
-    LPWSTR name;
     MetadataItem *result;
     USHORT *elements;

@@ -320,28 +340,28 @@ static HRESULT LoadHistMetadata(MetadataHandler *handler, IStream *stream, const

free(data);

-    result = calloc(1, sizeof(MetadataItem));
-    SHStrDupW(L"Frequencies", &name);
-    if (!result || !name) {
-        free(result);
-        CoTaskMemFree(name);
+    if (FAILED(hr = create_hist_item(elements, element_count, &result)))
+    {
         CoTaskMemFree(elements);
         return E_OUTOFMEMORY;
     }

-    PropVariantInit(&result[0].schema);
-    PropVariantInit(&result[0].id);
-    PropVariantInit(&result[0].value);
+    MetadataHandler_FreeItems(handler);
+    handler->items = result;
+    handler->item_count = 1;
+
+    return S_OK;
+}

-    result[0].id.vt = VT_LPWSTR;
-    result[0].id.pwszVal = name;
+static HRESULT CreateHistHandler(MetadataHandler *handler)
+{
+    MetadataItem *item;
+    HRESULT hr;

-    result[0].value.vt = VT_UI2|VT_VECTOR;
-    result[0].value.caui.cElems = element_count;
-    result[0].value.caui.pElems = elements;
+    if (FAILED(hr = create_hist_item(NULL, 0, &item)))
+        return hr;

-    MetadataHandler_FreeItems(handler);
-    handler->items = result;
+    handler->items = item;
     handler->item_count = 1;

return S_OK;
@@ -350,7 +370,8 @@ static HRESULT LoadHistMetadata(MetadataHandler *handler, IStream *stream, const
 static const MetadataHandlerVtbl HistReader_Vtbl = {
     0,
     &CLSID_WICPngHistMetadataReader,
-    LoadHistMetadata
+    LoadHistMetadata,
+    CreateHistHandler,
 };

HRESULT PngHistReader_CreateInstance(REFIID iid, void** ppv)
diff --git a/dlls/windowscodecs/tests/metadata.c b/dlls/windowscodecs/tests/metadata.c
index 54fe37345b7..f8f440ea658 100644
--- a/dlls/windowscodecs/tests/metadata.c
+++ b/dlls/windowscodecs/tests/metadata.c
@@ -1484,9 +1484,15 @@ static void test_metadata_hIST(void)

hr = IWICMetadataReader_GetCount(reader, &count);
     ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
-    todo_wine
     ok(count == 1, "Unexpected count %u.\n", count);

+    PropVariantInit(&value);
+    hr = IWICMetadataReader_GetValueByIndex(reader, 0, NULL, NULL, &value);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+    ok(value.vt == (VT_UI2|VT_VECTOR), "Unexpected value type %u.\n", value.vt);
+    ok(!value.caui.cElems, "Unexpected cElems %lu.\n", value.caub.cElems);
+    ok(!value.caui.pElems, "Unexpected value %p.\n", value.caui.pElems);
+
     load_stream(reader, metadata_hIST, sizeof(metadata_hIST), WICPersistOptionDefault);

hr = IWICMetadataReader_GetMetadataFormat(reader, &format);
@@ -1497,6 +1503,7 @@ static void test_metadata_hIST(void)
     ok(hr == S_OK, "GetCount failed, hr=%lx\n", hr);
     ok(count == 1, "unexpected count %i\n", count);

+    PropVariantInit(&value);
     hr = IWICMetadataReader_GetValueByIndex(reader, 0, &schema, &id, &value);
     ok(hr == S_OK, "GetValue failed, hr=%lx\n", hr);