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     const IEnumFiltersVtbl * lpVtbl;
  30     LONG refCount;
  31     IBaseFilter ** ppFilters;
  32     int nFilters;
  33     ULONG uIndex;
  34 } IEnumFiltersImpl;
  35
  36 static const struct IEnumFiltersVtbl IEnumFiltersImpl_Vtbl;
  37
  38 HRESULT IEnumFiltersImpl_Construct(IBaseFilter ** ppFilters, ULONG nFilters, IEnumFilters ** ppEnum)
  39 {
  40     /* Note: The incoming IBaseFilter interfaces are not AddRef'd here as in Windows,
  41      * they should have been previously AddRef'd. */
  42     IEnumFiltersImpl * pEnumFilters = CoTaskMemAlloc(sizeof(IEnumFiltersImpl));
  43
  44     TRACE("(%p, %d, %p)\n", ppFilters, nFilters, ppEnum);
  45
  46     *ppEnum = NULL;
  47
  48     if (!pEnumFilters)
  49     {
  50         return E_OUTOFMEMORY;
  51     }
  52
  53     pEnumFilters->lpVtbl = &IEnumFiltersImpl_Vtbl;
  54     pEnumFilters->refCount = 1;
  55     pEnumFilters->uIndex = 0;
  56     pEnumFilters->nFilters = nFilters;
  57     pEnumFilters->ppFilters = CoTaskMemAlloc(sizeof(IBaseFilter*) * nFilters);
  58     if (!pEnumFilters->ppFilters)
  59     {
  60         CoTaskMemFree(pEnumFilters);
  61         return E_OUTOFMEMORY;
  62     }
  63
  64     memcpy(pEnumFilters->ppFilters, ppFilters, nFilters * sizeof(IBaseFilter*));
  65
  66     *ppEnum = (IEnumFilters *)(&pEnumFilters->lpVtbl);
  67     return S_OK;
  68 }
  69
  70 static HRESULT WINAPI IEnumFiltersImpl_QueryInterface(IEnumFilters * iface, REFIID riid, LPVOID * ppv)
  71 {
  72     TRACE("(%p)->(%s, %p)\n", iface, qzdebugstr_guid(riid), ppv);
  73
  74     *ppv = NULL;
  75
  76     if (IsEqualIID(riid, &IID_IUnknown))
  77         *ppv = iface;
  78     else if (IsEqualIID(riid, &IID_IEnumFilters))
  79         *ppv = iface;
  80
  81     if (*ppv)
  82     {
  83         IUnknown_AddRef((IUnknown *)(*ppv));
  84         return S_OK;
  85     }
  86
  87     FIXME("No interface for %s!\n", qzdebugstr_guid(riid));
  88
  89     return E_NOINTERFACE;
  90 }
  91
  92 static ULONG WINAPI IEnumFiltersImpl_AddRef(IEnumFilters * iface)
  93 {
  94     IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
  95     ULONG refCount = InterlockedIncrement(&This->refCount);
  96
  97     TRACE("(%p)->()\n", iface);
  98
  99     return refCount;
 100 }
 101
 102 static ULONG WINAPI IEnumFiltersImpl_Release(IEnumFilters * iface)
 103 {
 104     IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
 105     ULONG refCount = InterlockedDecrement(&This->refCount);
 106
 107     TRACE("(%p)->()\n", iface);
 108
 109     if (!refCount)
 110     {
 111         CoTaskMemFree(This->ppFilters);
 112         CoTaskMemFree(This);
 113         return 0;
 114     }
 115     else
 116         return refCount;
 117 }
 118
 119 static HRESULT WINAPI IEnumFiltersImpl_Next(IEnumFilters * iface, ULONG cFilters, IBaseFilter ** ppFilters, ULONG * pcFetched)
 120 {
 121     ULONG cFetched;
 122     ULONG i;
 123     IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
 124
 125     cFetched = min(This->nFilters, This->uIndex + cFilters) - This->uIndex;
 126
 127     TRACE("(%p)->(%u, %p, %p)\n", iface, cFilters, ppFilters, pcFetched);
 128
 129     for (i = 0; i < cFetched; i++)
 130     {
 131         ppFilters[i] = This->ppFilters[This->uIndex + i];
 132         IBaseFilter_AddRef(ppFilters[i]);
 133     }
 134
 135     This->uIndex += cFetched;
 136
 137     if (pcFetched)
 138         *pcFetched = cFetched;
 139
 140     if (cFetched != cFilters)
 141         return S_FALSE;
 142     return S_OK;
 143 }
 144
 145 static HRESULT WINAPI IEnumFiltersImpl_Skip(IEnumFilters * iface, ULONG cFilters)
 146 {
 147     IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
 148
 149     TRACE("(%p)->(%u)\n", iface, cFilters);
 150
 151     if (This->uIndex + cFilters < This->nFilters)
 152     {
 153         This->uIndex += cFilters;
 154         return S_OK;
 155     }
 156     return S_FALSE;
 157 }
 158
 159 static HRESULT WINAPI IEnumFiltersImpl_Reset(IEnumFilters * iface)
 160 {
 161     IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
 162
 163     TRACE("(%p)->()\n", iface);
 164
 165     This->uIndex = 0;
 166     return S_OK;
 167 }
 168
 169 static HRESULT WINAPI IEnumFiltersImpl_Clone(IEnumFilters * iface, IEnumFilters ** ppEnum)
 170 {
 171     HRESULT hr;
 172     IEnumFiltersImpl *This = (IEnumFiltersImpl *)iface;
 173
 174     TRACE("(%p)->(%p)\n", iface, ppEnum);
 175
 176     hr = IEnumFiltersImpl_Construct(This->ppFilters, This->nFilters, ppEnum);
 177     if (FAILED(hr))
 178         return hr;
 179     return IEnumFilters_Skip(*ppEnum, This->uIndex);
 180 }
 181
 182 static const IEnumFiltersVtbl IEnumFiltersImpl_Vtbl =
 183 {
 184     IEnumFiltersImpl_QueryInterface,
 185     IEnumFiltersImpl_AddRef,
 186     IEnumFiltersImpl_Release,
 187     IEnumFiltersImpl_Next,
 188     IEnumFiltersImpl_Skip,
 189     IEnumFiltersImpl_Reset,
 190     IEnumFiltersImpl_Clone
 191 };