ole32: Fix equality check in CommonPrefixWith() for pointer moniker.

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/ole32/pointermoniker.c

@@ -48,9 +48,10 @@ typedef struct PointerMonikerImpl{
 
 static inline PointerMonikerImpl *impl_from_IMoniker(IMoniker *iface)
 {
-return CONTAINING_RECORD(iface, PointerMonikerImpl, IMoniker_iface);
+    return CONTAINING_RECORD(iface, PointerMonikerImpl, IMoniker_iface);
 }
 
+static PointerMonikerImpl *unsafe_impl_from_IMoniker(IMoniker *iface);
 static HRESULT WINAPI
 PointerMonikerImpl_QueryInterface(IMoniker* iface,REFIID riid,void** ppvObject)
 {
@@ -58,7 +59,6 @@ PointerMonikerImpl_QueryInterface(IMoniker* iface,REFIID riid,void** ppvObject)
 
     TRACE("(%p,%s,%p)\n",This,debugstr_guid(riid),ppvObject);
 
-    /* Perform a sanity check on the parameters.*/
     if ( (This==0) || (ppvObject==0) )
 	return E_INVALIDARG;
 
@@ -337,26 +337,20 @@ PointerMonikerImpl_Enum(IMoniker* iface,BOOL fForward, IEnumMoniker** ppenumMoni
 /******************************************************************************
  *        PointerMoniker_IsEqual
  ******************************************************************************/
-static HRESULT WINAPI
+static HRESULT WINAPI PointerMonikerImpl_IsEqual(IMoniker *iface, IMoniker *other)
-PointerMonikerImpl_IsEqual(IMoniker* iface,IMoniker* pmkOtherMoniker)
 {
-    PointerMonikerImpl *This = impl_from_IMoniker(iface);
+    PointerMonikerImpl *moniker = impl_from_IMoniker(iface), *other_moniker;
-    DWORD mkSys;
 
-    TRACE("(%p,%p)\n",iface,pmkOtherMoniker);
+    TRACE("%p, %p.\n", iface, other);
 
-    if (pmkOtherMoniker==NULL)
+    if (!other)
+        return E_INVALIDARG;
+
+    other_moniker = unsafe_impl_from_IMoniker(other);
+    if (!other_moniker)
         return S_FALSE;
 
-    IMoniker_IsSystemMoniker(pmkOtherMoniker,&mkSys);
+    return moniker->pObject == other_moniker->pObject ? S_OK : S_FALSE;
-
-    if (mkSys==MKSYS_POINTERMONIKER)
-    {
-        PointerMonikerImpl *pOtherMoniker = impl_from_IMoniker(pmkOtherMoniker);
-        return This->pObject == pOtherMoniker->pObject ? S_OK : S_FALSE;
-    }
-    else
-        return S_FALSE;
 }
 
 /******************************************************************************
@@ -412,18 +406,20 @@ PointerMonikerImpl_Inverse(IMoniker* iface,IMoniker** ppmk)
 /******************************************************************************
  *        PointerMoniker_CommonPrefixWith
  ******************************************************************************/
-static HRESULT WINAPI
+static HRESULT WINAPI PointerMonikerImpl_CommonPrefixWith(IMoniker *iface, IMoniker *other, IMoniker **prefix)
-PointerMonikerImpl_CommonPrefixWith(IMoniker* iface,IMoniker* pmkOther,IMoniker** ppmkPrefix)
 {
-    TRACE("(%p, %p)\n", pmkOther, ppmkPrefix);
+    TRACE("%p, %p, %p.\n", iface, other, prefix);
 
-    *ppmkPrefix = NULL;
+    if (!prefix || !other)
+        return E_INVALIDARG;
 
-    if (PointerMonikerImpl_IsEqual(iface, pmkOther))
+    *prefix = NULL;
+
+    if (PointerMonikerImpl_IsEqual(iface, other) == S_OK)
     {
         IMoniker_AddRef(iface);
 
-        *ppmkPrefix=iface;
+        *prefix = iface;
 
         return MK_S_US;
     }
@@ -539,6 +535,13 @@ static const IMonikerVtbl VT_PointerMonikerImpl =
     PointerMonikerImpl_IsSystemMoniker
 };
 
+static PointerMonikerImpl *unsafe_impl_from_IMoniker(IMoniker *iface)
+{
+    if (iface->lpVtbl != &VT_PointerMonikerImpl)
+        return NULL;
+    return CONTAINING_RECORD(iface, PointerMonikerImpl, IMoniker_iface);
+}
+
 /******************************************************************************
  *         PointerMoniker_Construct (local function)
  *******************************************************************************/

dlls/ole32/tests/moniker.c

@@ -2625,7 +2625,7 @@ todo_wine
 
 static void test_pointer_moniker(void)
 {
-    IMoniker *moniker, *inverse;
+    IMoniker *moniker, *moniker2, *prefix, *inverse;
     IEnumMoniker *enummoniker;
     HRESULT hr;
     DWORD moniker_type;
@@ -2748,6 +2748,45 @@ todo_wine
     ok(hr == E_NOTIMPL, "Unexpected hr %#x.\n", hr);
 
     IMoniker_Release(moniker);
+
+    /* CommonPrefixWith() */
+    hr = CreatePointerMoniker((IUnknown *)&Test_ClassFactory, &moniker);
+    ok(hr == S_OK, "Failed to create moniker, hr %#x.\n", hr);
+
+    hr = CreatePointerMoniker((IUnknown *)&Test_ClassFactory, &moniker2);
+    ok(hr == S_OK, "Failed to create moniker, hr %#x.\n", hr);
+
+    hr = IMoniker_IsEqual(moniker, NULL);
+    ok(hr == E_INVALIDARG, "Unexpected hr %#x.\n", hr);
+
+    hr = IMoniker_IsEqual(moniker, moniker2);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+
+    hr = IMoniker_CommonPrefixWith(moniker, moniker2, NULL);
+    ok(hr == E_INVALIDARG, "Unexpected hr %#x.\n", hr);
+
+    hr = IMoniker_CommonPrefixWith(moniker, NULL, &prefix);
+    ok(hr == E_INVALIDARG, "Unexpected hr %#x.\n", hr);
+
+    hr = IMoniker_CommonPrefixWith(moniker, moniker2, &prefix);
+    ok(hr == MK_S_US, "Unexpected hr %#x.\n", hr);
+    ok(prefix == moniker, "Unexpected pointer.\n");
+    IMoniker_Release(prefix);
+
+    IMoniker_Release(moniker2);
+
+    hr = CreatePointerMoniker((IUnknown *)moniker, &moniker2);
+    ok(hr == S_OK, "Failed to create moniker, hr %#x.\n", hr);
+
+    hr = IMoniker_IsEqual(moniker, moniker2);
+    ok(hr == S_FALSE, "Unexpected hr %#x.\n", hr);
+
+    hr = IMoniker_CommonPrefixWith(moniker, moniker2, &prefix);
+    ok(hr == MK_E_NOPREFIX, "Unexpected hr %#x.\n", hr);
+
+    IMoniker_Release(moniker2);
+
+    IMoniker_Release(moniker);
 }
 
 static void test_bind_context(void)