iunk.h

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#ifndef DS_IUNK_H
#define DS_IUNK_H

#include "guids.h"

#define INHERIT_IUNKNOWN() \
    long STDCALL ( *QueryInterface )(IUnknown * This, const GUID* riid, void **ppvObject); \
    long STDCALL ( *AddRef )(IUnknown * This); \
    long STDCALL ( *Release )(IUnknown * This);

#define DECLARE_IUNKNOWN() \
    int refcount;

#define IMPLEMENT_IUNKNOWN(CLASSNAME)           \
static long STDCALL CLASSNAME ## _QueryInterface(IUnknown * This, \
                                          const GUID* riid, void **ppvObject) \
{ \
    CLASSNAME * me = (CLASSNAME *)This;         \
    const GUID* r; unsigned int i = 0;          \
    Debug printf(#CLASSNAME "_QueryInterface(%p) called\n", This);\
    if (!ppvObject) return E_POINTER;           \
    for(r=me->interfaces; i<sizeof(me->interfaces)/sizeof(me->interfaces[0]); r++, i++) \
        if(!memcmp(r, riid, sizeof(*r)))        \
        {                                       \
            me->vt->AddRef((IUnknown*)This);    \
            *ppvObject=This;                    \
            return 0;                           \
        }                                       \
    Debug printf("Query failed! (GUID: 0x%x)\n", *(const unsigned int*)riid); \
    return E_NOINTERFACE;                       \
}                                               \
                                                \
static long STDCALL CLASSNAME ## _AddRef(IUnknown * This) \
{                                               \
    CLASSNAME * me=( CLASSNAME *)This;          \
    Debug printf(#CLASSNAME "_AddRef(%p) called (ref:%d)\n", This, me->refcount); \
    return ++(me->refcount);                    \
}                                               \
                                                \
static long STDCALL CLASSNAME ## _Release(IUnknown * This) \
{                                               \
    CLASSNAME* me=( CLASSNAME *)This;           \
    Debug printf(#CLASSNAME "_Release(%p) called (new ref:%d)\n", This, me->refcount - 1); \
    if(--(me->refcount) == 0)                   \
                CLASSNAME ## _Destroy(me);      \
    return 0;                                   \
}

#endif /* DS_IUNK_H */