compobj.dll16: COM cleanup for the IMalloc16 iface.

dlls/compobj.dll16/compobj.c

@@ -88,17 +88,20 @@ static LPMALLOC16 currentMalloc16=NULL;
 
 typedef struct
 {
-        /* IUnknown fields */
-        const IMalloc16Vtbl    *lpVtbl;
-        DWORD                   ref;
-        /* IMalloc16 fields */
+        IMalloc16 IMalloc16_iface;
+        DWORD     ref;
 } IMalloc16Impl;
 
+static inline IMalloc16Impl *impl_from_IMalloc16(IMalloc16 *iface)
+{
+        return CONTAINING_RECORD(iface, IMalloc16Impl, IMalloc16_iface);
+}
+
 /******************************************************************************
  *		IMalloc16_QueryInterface	[COMPOBJ.500]
  */
 HRESULT CDECL IMalloc16_fnQueryInterface(IMalloc16* iface,REFIID refiid,LPVOID *obj) {
-        IMalloc16Impl *This = (IMalloc16Impl *)iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
 
 	TRACE("(%p)->QueryInterface(%s,%p)\n",This,debugstr_guid(refiid),obj);
 	if (	!memcmp(&IID_IUnknown,refiid,sizeof(IID_IUnknown)) ||
@@ -114,7 +117,8 @@ HRESULT CDECL IMalloc16_fnQueryInterface(IMalloc16* iface,REFIID refiid,LPVOID *
  *		IMalloc16_AddRef	[COMPOBJ.501]
  */
 ULONG CDECL IMalloc16_fnAddRef(IMalloc16* iface) {
-        IMalloc16Impl *This = (IMalloc16Impl *)iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
 	TRACE("(%p)->AddRef()\n",This);
 	return 1; /* cannot be freed */
 }
@@ -123,7 +127,8 @@ ULONG CDECL IMalloc16_fnAddRef(IMalloc16* iface) {
  *		IMalloc16_Release	[COMPOBJ.502]
  */
 ULONG CDECL IMalloc16_fnRelease(IMalloc16* iface) {
-        IMalloc16Impl *This = (IMalloc16Impl *)iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
 	TRACE("(%p)->Release()\n",This);
 	return 1; /* cannot be freed */
 }
@@ -132,7 +137,8 @@ ULONG CDECL IMalloc16_fnRelease(IMalloc16* iface) {
  * IMalloc16_Alloc [COMPOBJ.503]
  */
 SEGPTR CDECL IMalloc16_fnAlloc(IMalloc16* iface,DWORD cb) {
-        IMalloc16Impl *This = (IMalloc16Impl *)iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
 	TRACE("(%p)->Alloc(%d)\n",This,cb);
         return MapLS( HeapAlloc( GetProcessHeap(), 0, cb ) );
 }
@@ -143,7 +149,7 @@ SEGPTR CDECL IMalloc16_fnAlloc(IMalloc16* iface,DWORD cb) {
 VOID CDECL IMalloc16_fnFree(IMalloc16* iface,SEGPTR pv)
 {
     void *ptr = MapSL(pv);
-    IMalloc16Impl *This = (IMalloc16Impl *)iface;
+    IMalloc16Impl *This = impl_from_IMalloc16(iface);
     TRACE("(%p)->Free(%08x)\n",This,pv);
     UnMapLS(pv);
     HeapFree( GetProcessHeap(), 0, ptr );
@@ -155,7 +161,8 @@ VOID CDECL IMalloc16_fnFree(IMalloc16* iface,SEGPTR pv)
 SEGPTR CDECL IMalloc16_fnRealloc(IMalloc16* iface,SEGPTR pv,DWORD cb)
 {
     SEGPTR ret;
-    IMalloc16Impl *This = (IMalloc16Impl *)iface;
+    IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
     TRACE("(%p)->Realloc(%08x,%d)\n",This,pv,cb);
     if (!pv)
 	ret = IMalloc16_fnAlloc(iface, cb);
@@ -174,7 +181,8 @@ SEGPTR CDECL IMalloc16_fnRealloc(IMalloc16* iface,SEGPTR pv,DWORD cb)
  */
 DWORD CDECL IMalloc16_fnGetSize(IMalloc16* iface,SEGPTR pv)
 {
-	IMalloc16Impl *This = (IMalloc16Impl *)iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
         TRACE("(%p)->GetSize(%08x)\n",This,pv);
         return HeapSize( GetProcessHeap(), 0, MapSL(pv) );
 }
@@ -183,7 +191,8 @@ DWORD CDECL IMalloc16_fnGetSize(IMalloc16* iface,SEGPTR pv)
  * IMalloc16_DidAlloc [COMPOBJ.507]
  */
 INT16 CDECL IMalloc16_fnDidAlloc(IMalloc16* iface,LPVOID pv) {
-        IMalloc16 *This = iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
 	TRACE("(%p)->DidAlloc(%p)\n",This,pv);
 	return (INT16)-1;
 }
@@ -192,7 +201,8 @@ INT16 CDECL IMalloc16_fnDidAlloc(IMalloc16* iface,LPVOID pv) {
  * IMalloc16_HeapMinimize [COMPOBJ.508]
  */
 LPVOID CDECL IMalloc16_fnHeapMinimize(IMalloc16* iface) {
-        IMalloc16Impl *This = (IMalloc16Impl *)iface;
+        IMalloc16Impl *This = impl_from_IMalloc16(iface);
+
 	TRACE("(%p)->HeapMinimize()\n",This);
 	return NULL;
 }
@@ -224,7 +234,7 @@ IMalloc16_Constructor(void)
 #undef VTENT
         msegvt16 = MapLS( &vt16 );
     }
-    This->lpVtbl = (const IMalloc16Vtbl*)msegvt16;
+    This->IMalloc16_iface.lpVtbl = (const IMalloc16Vtbl*)msegvt16;
     This->ref = 1;
     return (LPMALLOC16)MapLS( This );
 }