dlls/quartz/enumpins.c

   1 /*
   2  * Implementation of IEnumPins Interface
   3  *
   4  * Copyright 2003 Robert Shearman
   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 IEnumPinsImpl
  28 {
  29     const IEnumPinsVtbl * lpVtbl;
  30     LONG refCount;
  31     ENUMPINDETAILS enumPinDetails;
  32     ULONG uIndex;
  33 } IEnumPinsImpl;
  34
  35 static const struct IEnumPinsVtbl IEnumPinsImpl_Vtbl;
  36
  37 HRESULT IEnumPinsImpl_Construct(const ENUMPINDETAILS * pDetails, IEnumPins ** ppEnum)
  38 {
  39     IEnumPinsImpl * pEnumPins = CoTaskMemAlloc(sizeof(IEnumPinsImpl));
  40     if (!pEnumPins)
  41     {
  42         *ppEnum = NULL;
  43         return E_OUTOFMEMORY;
  44     }
  45     pEnumPins->lpVtbl = &IEnumPinsImpl_Vtbl;
  46     pEnumPins->refCount = 1;
  47     pEnumPins->uIndex = 0;
  48     pEnumPins->enumPinDetails = *pDetails;
  49     *ppEnum = (IEnumPins *)(&pEnumPins->lpVtbl);
  50
  51     TRACE("Created new enumerator (%p)\n", *ppEnum);
  52     return S_OK;
  53 }
  54
  55 static HRESULT WINAPI IEnumPinsImpl_QueryInterface(IEnumPins * iface, REFIID riid, LPVOID * ppv)
  56 {
  57     TRACE("(%s, %p)\n", qzdebugstr_guid(riid), ppv);
  58
  59     *ppv = NULL;
  60
  61     if (IsEqualIID(riid, &IID_IUnknown))
  62         *ppv = (LPVOID)iface;
  63     else if (IsEqualIID(riid, &IID_IEnumPins))
  64         *ppv = (LPVOID)iface;
  65
  66     if (*ppv)
  67     {
  68         IUnknown_AddRef((IUnknown *)(*ppv));
  69         return S_OK;
  70     }
  71
  72     FIXME("No interface for %s!\n", qzdebugstr_guid(riid));
  73
  74     return E_NOINTERFACE;
  75 }
  76
  77 static ULONG WINAPI IEnumPinsImpl_AddRef(IEnumPins * iface)
  78 {
  79     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
  80     ULONG refCount = InterlockedIncrement(&This->refCount);
  81
  82     TRACE("(%p)->() AddRef from %d\n", This, refCount - 1);
  83
  84     return refCount;
  85 }
  86
  87 static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
  88 {
  89     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
  90     ULONG refCount = InterlockedDecrement(&This->refCount);
  91
  92     TRACE("(%p)->() Release from %d\n", This, refCount + 1);
  93
  94     if (!refCount)
  95     {
  96         CoTaskMemFree(This);
  97         return 0;
  98     }
  99     else
 100         return refCount;
 101 }
 102
 103 static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
 104 {
 105     ULONG cFetched;
 106     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 107
 108     cFetched = min(This->enumPinDetails.cPins, This->uIndex + cPins) - This->uIndex;
 109
 110     TRACE("(%u, %p, %p)\n", cPins, ppPins, pcFetched);
 111
 112     if (cFetched > 0)
 113     {
 114         ULONG i;
 115         for (i = 0; i < cFetched; i++) {
 116             IPin_AddRef(This->enumPinDetails.ppPins[This->uIndex + i]);
 117             ppPins[i] = This->enumPinDetails.ppPins[This->uIndex + i];
 118         }
 119     }
 120
 121     if ((cPins != 1) || pcFetched)
 122         *pcFetched = cFetched;
 123
 124     This->uIndex += cFetched;
 125
 126     if (cFetched != cPins)
 127         return S_FALSE;
 128     return S_OK;
 129 }
 130
 131 static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins * iface, ULONG cPins)
 132 {
 133     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 134
 135     TRACE("(%u)\n", cPins);
 136
 137     if (This->uIndex + cPins < This->enumPinDetails.cPins)
 138     {
 139         This->uIndex += cPins;
 140         return S_OK;
 141     }
 142     return S_FALSE;
 143 }
 144
 145 static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins * iface)
 146 {
 147     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 148
 149     TRACE("IEnumPinsImpl::Reset()\n");
 150
 151     This->uIndex = 0;
 152     return S_OK;
 153 }
 154
 155 static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins * iface, IEnumPins ** ppEnum)
 156 {
 157     HRESULT hr;
 158     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 159
 160     TRACE("(%p)\n", ppEnum);
 161
 162     hr = IEnumPinsImpl_Construct(&This->enumPinDetails, ppEnum);
 163     if (FAILED(hr))
 164         return hr;
 165     return IEnumPins_Skip(*ppEnum, This->uIndex);
 166 }
 167
 168 static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
 169 {
 170     IEnumPinsImpl_QueryInterface,
 171     IEnumPinsImpl_AddRef,
 172     IEnumPinsImpl_Release,
 173     IEnumPinsImpl_Next,
 174     IEnumPinsImpl_Skip,
 175     IEnumPinsImpl_Reset,
 176     IEnumPinsImpl_Clone
 177 };