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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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     ULONG 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     CopyMemory(&pEnumPins->enumPinDetails, pDetails, sizeof(ENUMPINDETAILS));
  49     *ppEnum = (IEnumPins *)(&pEnumPins->lpVtbl);
  50     return S_OK;
  51 }
  52
  53 static HRESULT WINAPI IEnumPinsImpl_QueryInterface(IEnumPins * iface, REFIID riid, LPVOID * ppv)
  54 {
  55     TRACE("(%s, %p)\n", qzdebugstr_guid(riid), ppv);
  56
  57     *ppv = NULL;
  58
  59     if (IsEqualIID(riid, &IID_IUnknown))
  60         *ppv = (LPVOID)iface;
  61     else if (IsEqualIID(riid, &IID_IEnumPins))
  62         *ppv = (LPVOID)iface;
  63
  64     if (*ppv)
  65     {
  66         IUnknown_AddRef((IUnknown *)(*ppv));
  67         return S_OK;
  68     }
  69
  70     FIXME("No interface for %s!\n", qzdebugstr_guid(riid));
  71
  72     return E_NOINTERFACE;
  73 }
  74
  75 static ULONG WINAPI IEnumPinsImpl_AddRef(IEnumPins * iface)
  76 {
  77     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
  78     ULONG refCount = InterlockedIncrement(&This->refCount);
  79
  80     TRACE("()\n");
  81
  82     return refCount;
  83 }
  84
  85 static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
  86 {
  87     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
  88     ULONG refCount = InterlockedDecrement(&This->refCount);
  89
  90     TRACE("()\n");
  91
  92     if (!refCount)
  93     {
  94         CoTaskMemFree(This);
  95         return 0;
  96     }
  97     else
  98         return refCount;
  99 }
 100
 101 static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
 102 {
 103     ULONG cFetched;
 104     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 105
 106     cFetched = min(This->enumPinDetails.cPins, This->uIndex + cPins) - This->uIndex;
 107
 108     TRACE("(%lu, %p, %p)\n", cPins, ppPins, pcFetched);
 109
 110     if (cFetched > 0)
 111     {
 112         ULONG i;
 113         for (i = 0; i < cFetched; i++) {
 114             IPin_AddRef(This->enumPinDetails.ppPins[This->uIndex + i]);
 115             ppPins[i] = This->enumPinDetails.ppPins[This->uIndex + i];
 116         }
 117     }
 118
 119     if ((cPins != 1) || pcFetched)
 120         *pcFetched = cFetched;
 121
 122     This->uIndex += cFetched;
 123
 124     if (cFetched != cPins)
 125         return S_FALSE;
 126     return S_OK;
 127 }
 128
 129 static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins * iface, ULONG cPins)
 130 {
 131     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 132
 133     TRACE("(%lu)\n", cPins);
 134
 135     if (This->uIndex + cPins < This->enumPinDetails.cPins)
 136     {
 137         This->uIndex += cPins;
 138         return S_OK;
 139     }
 140     return S_FALSE;
 141 }
 142
 143 static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins * iface)
 144 {
 145     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 146
 147     TRACE("IEnumPinsImpl::Reset()\n");
 148
 149     This->uIndex = 0;
 150     return S_OK;
 151 }
 152
 153 static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins * iface, IEnumPins ** ppEnum)
 154 {
 155     HRESULT hr;
 156     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 157
 158     TRACE("(%p)\n", ppEnum);
 159
 160     hr = IEnumPinsImpl_Construct(&This->enumPinDetails, ppEnum);
 161     if (FAILED(hr))
 162         return hr;
 163     return IEnumPins_Skip(*ppEnum, This->uIndex);
 164 }
 165
 166 static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
 167 {
 168     IEnumPinsImpl_QueryInterface,
 169     IEnumPinsImpl_AddRef,
 170     IEnumPinsImpl_Release,
 171     IEnumPinsImpl_Next,
 172     IEnumPinsImpl_Skip,
 173     IEnumPinsImpl_Reset,
 174     IEnumPinsImpl_Clone
 175 };