dlls/quartz/enumfilters.c

   1 /*
   2  * Implementation of IEnumFilters Interface
   3  *
   4  * Copyright 2004 Christian Costa
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "quartz_private.h"
  22
  23 #include "wine/debug.h"
  24
  25 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
  26
  27 typedef struct IEnumFiltersImpl
  28 {
  29     IEnumFilters IEnumFilters_iface;
  30     LONG refCount;
  31     IBaseFilter ** ppFilters;
  32     int nFilters;
  33     ULONG uIndex;
  34 } IEnumFiltersImpl;
  35
  36 static const struct IEnumFiltersVtbl IEnumFiltersImpl_Vtbl;
  37
  38 static inline IEnumFiltersImpl *impl_from_IEnumFilters(IEnumFilters *iface)
  39 {
  40     return CONTAINING_RECORD(iface, IEnumFiltersImpl, IEnumFilters_iface);
  41 }
  42
  43 HRESULT IEnumFiltersImpl_Construct(IBaseFilter ** ppFilters, ULONG nFilters, IEnumFilters ** ppEnum)
  44 {
  45     /* Note: The incoming IBaseFilter interfaces are not AddRef'd here as in Windows,
  46      * they should have been previously AddRef'd. */
  47     IEnumFiltersImpl * pEnumFilters = CoTaskMemAlloc(sizeof(IEnumFiltersImpl));
  48
  49     TRACE("(%p, %d, %p)\n", ppFilters, nFilters, ppEnum);
  50
  51     *ppEnum = NULL;
  52
  53     if (!pEnumFilters)
  54     {
  55         return E_OUTOFMEMORY;
  56     }
  57
  58     pEnumFilters->IEnumFilters_iface.lpVtbl = &IEnumFiltersImpl_Vtbl;
  59     pEnumFilters->refCount = 1;
  60     pEnumFilters->uIndex = 0;
  61     pEnumFilters->nFilters = nFilters;
  62     pEnumFilters->ppFilters = CoTaskMemAlloc(sizeof(IBaseFilter*) * nFilters);
  63     if (!pEnumFilters->ppFilters)
  64     {
  65         CoTaskMemFree(pEnumFilters);
  66         return E_OUTOFMEMORY;
  67     }
  68
  69     memcpy(pEnumFilters->ppFilters, ppFilters, nFilters * sizeof(IBaseFilter*));
  70
  71     *ppEnum = &pEnumFilters->IEnumFilters_iface;
  72     return S_OK;
  73 }
  74
  75 static HRESULT WINAPI IEnumFiltersImpl_QueryInterface(IEnumFilters * iface, REFIID riid, LPVOID * ppv)
  76 {
  77     TRACE("(%p)->(%s, %p)\n", iface, qzdebugstr_guid(riid), ppv);
  78
  79     *ppv = NULL;
  80
  81     if (IsEqualIID(riid, &IID_IUnknown))
  82         *ppv = iface;
  83     else if (IsEqualIID(riid, &IID_IEnumFilters))
  84         *ppv = iface;
  85
  86     if (*ppv)
  87     {
  88         IUnknown_AddRef((IUnknown *)(*ppv));
  89         return S_OK;
  90     }
  91
  92     FIXME("No interface for %s!\n", qzdebugstr_guid(riid));
  93
  94     return E_NOINTERFACE;
  95 }
  96
  97 static ULONG WINAPI IEnumFiltersImpl_AddRef(IEnumFilters * iface)
  98 {
  99     IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 100     ULONG refCount = InterlockedIncrement(&This->refCount);
 101
 102     TRACE("(%p)->()\n", iface);
 103
 104     return refCount;
 105 }
 106
 107 static ULONG WINAPI IEnumFiltersImpl_Release(IEnumFilters * iface)
 108 {
 109     IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 110     ULONG refCount = InterlockedDecrement(&This->refCount);
 111
 112     TRACE("(%p)->()\n", iface);
 113
 114     if (!refCount)
 115     {
 116         CoTaskMemFree(This->ppFilters);
 117         CoTaskMemFree(This);
 118         return 0;
 119     }
 120     else
 121         return refCount;
 122 }
 123
 124 static HRESULT WINAPI IEnumFiltersImpl_Next(IEnumFilters * iface, ULONG cFilters, IBaseFilter ** ppFilters, ULONG * pcFetched)
 125 {
 126     ULONG cFetched;
 127     ULONG i;
 128     IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 129
 130     cFetched = min(This->nFilters, This->uIndex + cFilters) - This->uIndex;
 131
 132     TRACE("(%p)->(%u, %p, %p)\n", iface, cFilters, ppFilters, pcFetched);
 133
 134     if (!ppFilters)
 135         return E_POINTER;
 136
 137     for (i = 0; i < cFetched; i++)
 138     {
 139         ppFilters[i] = This->ppFilters[This->uIndex + i];
 140         IBaseFilter_AddRef(ppFilters[i]);
 141     }
 142
 143     This->uIndex += cFetched;
 144
 145     if (pcFetched)
 146         *pcFetched = cFetched;
 147
 148     if (cFetched != cFilters)
 149         return S_FALSE;
 150     return S_OK;
 151 }
 152
 153 static HRESULT WINAPI IEnumFiltersImpl_Skip(IEnumFilters * iface, ULONG cFilters)
 154 {
 155     IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 156
 157     TRACE("(%p)->(%u)\n", iface, cFilters);
 158
 159     if (This->uIndex + cFilters < This->nFilters)
 160     {
 161         This->uIndex += cFilters;
 162         return S_OK;
 163     }
 164     return S_FALSE;
 165 }
 166
 167 static HRESULT WINAPI IEnumFiltersImpl_Reset(IEnumFilters * iface)
 168 {
 169     IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 170
 171     TRACE("(%p)->()\n", iface);
 172
 173     This->uIndex = 0;
 174     return S_OK;
 175 }
 176
 177 static HRESULT WINAPI IEnumFiltersImpl_Clone(IEnumFilters * iface, IEnumFilters ** ppEnum)
 178 {
 179     HRESULT hr;
 180     IEnumFiltersImpl *This = impl_from_IEnumFilters(iface);
 181
 182     TRACE("(%p)->(%p)\n", iface, ppEnum);
 183
 184     hr = IEnumFiltersImpl_Construct(This->ppFilters, This->nFilters, ppEnum);
 185     if (FAILED(hr))
 186         return hr;
 187     return IEnumFilters_Skip(*ppEnum, This->uIndex);
 188 }
 189
 190 static const IEnumFiltersVtbl IEnumFiltersImpl_Vtbl =
 191 {
 192     IEnumFiltersImpl_QueryInterface,
 193     IEnumFiltersImpl_AddRef,
 194     IEnumFiltersImpl_Release,
 195     IEnumFiltersImpl_Next,
 196     IEnumFiltersImpl_Skip,
 197     IEnumFiltersImpl_Reset,
 198     IEnumFiltersImpl_Clone
 199 };