source: trunk/src/quartz/enumunk.c@ 6823

/*
 * Implementation of IEnumUnknown (for internal use).
 *
 * hidenori@a2.ctktv.ne.jp
 */

#include "config.h"

#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winerror.h"
#include "wine/obj_base.h"
#include "wine/obj_oleaut.h"
#include "strmif.h"
#include "control.h"
#include "uuids.h"

#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(quartz);

#include "quartz_private.h"
#include "enumunk.h"
#include "iunk.h"



typedef struct IEnumUnknownImpl
{
        ICOM_VFIELD(IEnumUnknown);
} IEnumUnknownImpl;

typedef struct
{
        QUARTZ_IUnkImpl unk;
        IEnumUnknownImpl        enumunk;
        struct QUARTZ_IFEntry   IFEntries[1];
        QUARTZ_CompList*        pCompList;
        QUARTZ_CompListItem*    pItemCur;
} CEnumUnknown;

#define CEnumUnknown_THIS(iface,member)         CEnumUnknown*   This = ((CEnumUnknown*)(((char*)iface)-offsetof(CEnumUnknown,member)))




static HRESULT WINAPI
IEnumUnknown_fnQueryInterface(IEnumUnknown* iface,REFIID riid,void** ppobj)
{
        CEnumUnknown_THIS(iface,enumunk);

        TRACE("(%p)->()\n",This);

        return IUnknown_QueryInterface(This->unk.punkControl,riid,ppobj);
}

static ULONG WINAPI
IEnumUnknown_fnAddRef(IEnumUnknown* iface)
{
        CEnumUnknown_THIS(iface,enumunk);

        TRACE("(%p)->()\n",This);

        return IUnknown_AddRef(This->unk.punkControl);
}

static ULONG WINAPI
IEnumUnknown_fnRelease(IEnumUnknown* iface)
{
        CEnumUnknown_THIS(iface,enumunk);

        TRACE("(%p)->()\n",This);

        return IUnknown_Release(This->unk.punkControl);
}

static HRESULT WINAPI
IEnumUnknown_fnNext(IEnumUnknown* iface,ULONG cReq,IUnknown** ppunk,ULONG* pcFetched)
{
        CEnumUnknown_THIS(iface,enumunk);
        HRESULT hr;
        ULONG   cFetched;

        TRACE("(%p)->(%lu,%p,%p)\n",This,cReq,ppunk,pcFetched);

        if ( pcFetched == NULL && cReq > 1 )
                return E_INVALIDARG;
        if ( ppunk == NULL )
                return E_POINTER;

        QUARTZ_CompList_Lock( This->pCompList );

        hr = NOERROR;
        cFetched = 0;
        while ( cReq > 0 )
        {
                if ( This->pItemCur == NULL )
                {
                        hr = S_FALSE;
                        break;
                }
                ppunk[ cFetched ++ ] = QUARTZ_CompList_GetItemPtr( This->pItemCur );
                IUnknown_AddRef( *ppunk );

                This->pItemCur =
                        QUARTZ_CompList_GetNext( This->pCompList, This->pItemCur );
                cReq --;
        }

        QUARTZ_CompList_Unlock( This->pCompList );

        if ( pcFetched != NULL )
                *pcFetched = cFetched;

        return hr;
}

static HRESULT WINAPI
IEnumUnknown_fnSkip(IEnumUnknown* iface,ULONG cSkip)
{
        CEnumUnknown_THIS(iface,enumunk);
        HRESULT hr;

        TRACE("(%p)->()\n",This);

        QUARTZ_CompList_Lock( This->pCompList );

        hr = NOERROR;
        while ( cSkip > 0 )
        {
                if ( This->pItemCur == NULL )
                {
                        hr = S_FALSE;
                        break;
                }
                This->pItemCur =
                        QUARTZ_CompList_GetNext( This->pCompList, This->pItemCur );
                cSkip --;
        }

        QUARTZ_CompList_Unlock( This->pCompList );

        return hr;
}

static HRESULT WINAPI
IEnumUnknown_fnReset(IEnumUnknown* iface)
{
        CEnumUnknown_THIS(iface,enumunk);

        TRACE("(%p)->()\n",This);

        QUARTZ_CompList_Lock( This->pCompList );

        This->pItemCur = QUARTZ_CompList_GetFirst( This->pCompList );

        QUARTZ_CompList_Unlock( This->pCompList );

        return NOERROR;
}

static HRESULT WINAPI
IEnumUnknown_fnClone(IEnumUnknown* iface,IEnumUnknown** ppunk)
{
        CEnumUnknown_THIS(iface,enumunk);
        HRESULT hr;

        TRACE("(%p)->()\n",This);

        if ( ppunk == NULL )
                return E_POINTER;

        QUARTZ_CompList_Lock( This->pCompList );

        hr = QUARTZ_CreateEnumUnknown(
                This->IFEntries[0].piid,
                (void**)ppunk,
                This->pCompList );

        QUARTZ_CompList_Unlock( This->pCompList );

        return hr;
}


static ICOM_VTABLE(IEnumUnknown) ienumunk =
{
        ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
        /* IUnknown fields */
        IEnumUnknown_fnQueryInterface,
        IEnumUnknown_fnAddRef,
        IEnumUnknown_fnRelease,
        /* IEnumUnknown fields */
        IEnumUnknown_fnNext,
        IEnumUnknown_fnSkip,
        IEnumUnknown_fnReset,
        IEnumUnknown_fnClone,
};

void QUARTZ_DestroyEnumUnknown(IUnknown* punk)
{
        CEnumUnknown_THIS(punk,unk);

        if ( This->pCompList != NULL )
                QUARTZ_CompList_Free( This->pCompList );
}

HRESULT QUARTZ_CreateEnumUnknown(
        REFIID riidEnum, void** ppobj, const QUARTZ_CompList* pCompList )
{
        CEnumUnknown*   penum;
        QUARTZ_CompList*        pCompListDup;

        TRACE("(%s,%p,%p)\n",debugstr_guid(riidEnum),ppobj,pCompList);

        pCompListDup = QUARTZ_CompList_Dup( pCompList, FALSE );
        if ( pCompListDup == NULL )
                return E_OUTOFMEMORY;

        penum = (CEnumUnknown*)QUARTZ_AllocObj( sizeof(CEnumUnknown) );
        if ( penum == NULL )
        {
                QUARTZ_CompList_Free( pCompListDup );
                return E_OUTOFMEMORY;
        }

        QUARTZ_IUnkInit( &penum->unk, NULL );
        ICOM_VTBL(&penum->enumunk) = &ienumunk;

        penum->IFEntries[0].piid = riidEnum;
        penum->IFEntries[0].ofsVTPtr =
                offsetof(CEnumUnknown,enumunk)-offsetof(CEnumUnknown,unk);
        penum->pCompList = pCompListDup;
        penum->pItemCur = QUARTZ_CompList_GetFirst( pCompListDup );

        penum->unk.pEntries = penum->IFEntries;
        penum->unk.dwEntries = 1;
        penum->unk.pOnFinalRelease = QUARTZ_DestroyEnumUnknown;

        *ppobj = (void*)(&penum->enumunk);

        return S_OK;
}