Sweden-Number/dlls/quartz/enumfilters.c

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/*
* Implementation of IEnumFilters Interface
*
* Copyright 2004 Christian Costa
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "quartz_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(quartz);
typedef struct IEnumFiltersImpl
{
const IEnumFiltersVtbl * lpVtbl;
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LONG refCount;
IBaseFilter ** ppFilters;
int nFilters;
ULONG uIndex;
} IEnumFiltersImpl;
static const struct IEnumFiltersVtbl IEnumFiltersImpl_Vtbl;
HRESULT IEnumFiltersImpl_Construct(IBaseFilter ** ppFilters, ULONG nFilters, IEnumFilters ** ppEnum)
{
/* Note: The incoming IBaseFilter interfaces are not AddRef'd here as in Windows,
* they should have been previously AddRef'd. */
IEnumFiltersImpl * pEnumFilters = CoTaskMemAlloc(sizeof(IEnumFiltersImpl));
TRACE("(%p, %ld, %p)\n", ppFilters, nFilters, ppEnum);
*ppEnum = NULL;
if (!pEnumFilters)
{
return E_OUTOFMEMORY;
}
pEnumFilters->lpVtbl = &IEnumFiltersImpl_Vtbl;
pEnumFilters->refCount = 1;
pEnumFilters->uIndex = 0;
pEnumFilters->nFilters = nFilters;
pEnumFilters->ppFilters = CoTaskMemAlloc(sizeof(IBaseFilter*) * nFilters);
if (!pEnumFilters->ppFilters)
{
CoTaskMemFree(pEnumFilters);
return E_OUTOFMEMORY;
}
memcpy(pEnumFilters->ppFilters, ppFilters, nFilters * sizeof(IBaseFilter*));
*ppEnum = (IEnumFilters *)(&pEnumFilters->lpVtbl);
return S_OK;
}
static HRESULT WINAPI IEnumFiltersImpl_QueryInterface(IEnumFilters * iface, REFIID riid, LPVOID * ppv)
{
TRACE("(%p)->(%s, %p)\n", iface, qzdebugstr_guid(riid), ppv);
*ppv = NULL;
if (IsEqualIID(riid, &IID_IUnknown))
*ppv = (LPVOID)iface;
else if (IsEqualIID(riid, &IID_IEnumFilters))
*ppv = (LPVOID)iface;
if (*ppv)
{
IUnknown_AddRef((IUnknown *)(*ppv));
return S_OK;
}
FIXME("No interface for %s!\n", qzdebugstr_guid(riid));
return E_NOINTERFACE;
}
static ULONG WINAPI IEnumFiltersImpl_AddRef(IEnumFilters * iface)
{
IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
ULONG refCount = InterlockedIncrement(&This->refCount);
TRACE("(%p)->()\n", iface);
return refCount;
}
static ULONG WINAPI IEnumFiltersImpl_Release(IEnumFilters * iface)
{
IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
ULONG refCount = InterlockedDecrement(&This->refCount);
TRACE("(%p)->()\n", iface);
if (!refCount)
{
CoTaskMemFree(This->ppFilters);
CoTaskMemFree(This);
return 0;
}
else
return refCount;
}
static HRESULT WINAPI IEnumFiltersImpl_Next(IEnumFilters * iface, ULONG cFilters, IBaseFilter ** ppFilters, ULONG * pcFetched)
{
ULONG cFetched;
ULONG i;
IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
cFetched = min(This->nFilters, This->uIndex + cFilters) - This->uIndex;
TRACE("(%p)->(%lu, %p, %p)\n", iface, cFilters, ppFilters, pcFetched);
for (i = 0; i < cFetched; i++)
{
ppFilters[i] = This->ppFilters[This->uIndex + i];
IBaseFilter_AddRef(ppFilters[i]);
}
This->uIndex += cFetched;
if (pcFetched)
*pcFetched = cFetched;
if (cFetched != cFilters)
return S_FALSE;
return S_OK;
}
static HRESULT WINAPI IEnumFiltersImpl_Skip(IEnumFilters * iface, ULONG cFilters)
{
IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
TRACE("(%p)->(%lu)\n", iface, cFilters);
if (This->uIndex + cFilters < This->nFilters)
{
This->uIndex += cFilters;
return S_OK;
}
return S_FALSE;
}
static HRESULT WINAPI IEnumFiltersImpl_Reset(IEnumFilters * iface)
{
IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
TRACE("(%p)->()\n", iface);
This->uIndex = 0;
return S_OK;
}
static HRESULT WINAPI IEnumFiltersImpl_Clone(IEnumFilters * iface, IEnumFilters ** ppEnum)
{
HRESULT hr;
IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
TRACE("(%p)->(%p)\n", iface, ppEnum);
hr = IEnumFiltersImpl_Construct(This->ppFilters, This->nFilters, ppEnum);
if (FAILED(hr))
return hr;
return IEnumFilters_Skip(*ppEnum, This->uIndex);
}
static const IEnumFiltersVtbl IEnumFiltersImpl_Vtbl =
{
IEnumFiltersImpl_QueryInterface,
IEnumFiltersImpl_AddRef,
IEnumFiltersImpl_Release,
IEnumFiltersImpl_Next,
IEnumFiltersImpl_Skip,
IEnumFiltersImpl_Reset,
IEnumFiltersImpl_Clone
};