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
  79     TRACE("()\n");
  80
  81     return ++This->refCount;
  82 }
  83
  84 static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
  85 {
  86     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
  87
  88     TRACE("()\n");
  89
  90     if (!--This->refCount)
  91     {
  92         CoTaskMemFree(This);
  93         return 0;
  94     }
  95     else
  96         return This->refCount;
  97 }
  98
  99 static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
 100 {
 101     ULONG cFetched;
 102     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 103
 104     cFetched = min(This->enumPinDetails.cPins, This->uIndex + cPins) - This->uIndex;
 105
 106     TRACE("(%lu, %p, %p)\n", cPins, ppPins, pcFetched);
 107
 108     if (cFetched > 0)
 109     {
 110         ULONG i;
 111
 112         *ppPins = This->enumPinDetails.ppPins[This->uIndex];
 113         for (i = This->uIndex; i < This->uIndex + cFetched; i++)
 114             IPin_AddRef(This->enumPinDetails.ppPins[i]);
 115     }
 116
 117     if ((cPins != 1) || pcFetched)
 118         *pcFetched = cFetched;
 119
 120     This->uIndex += cFetched;
 121
 122     if (cFetched != cPins)
 123         return S_FALSE;
 124     return S_OK;
 125 }
 126
 127 static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins * iface, ULONG cPins)
 128 {
 129     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 130
 131     TRACE("(%lu)\n", cPins);
 132
 133     if (This->uIndex + cPins < This->enumPinDetails.cPins)
 134     {
 135         This->uIndex += cPins;
 136         return S_OK;
 137     }
 138     return S_FALSE;
 139 }
 140
 141 static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins * iface)
 142 {
 143     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 144
 145     TRACE("IEnumPinsImpl::Reset()\n");
 146
 147     This->uIndex = 0;
 148     return S_OK;
 149 }
 150
 151 static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins * iface, IEnumPins ** ppEnum)
 152 {
 153     HRESULT hr;
 154     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 155
 156     TRACE("(%p)\n", ppEnum);
 157
 158     hr = IEnumPinsImpl_Construct(&This->enumPinDetails, ppEnum);
 159     if (FAILED(hr))
 160         return hr;
 161     return IEnumPins_Skip(*ppEnum, This->uIndex);
 162 }
 163
 164 static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
 165 {
 166     IEnumPinsImpl_QueryInterface,
 167     IEnumPinsImpl_AddRef,
 168     IEnumPinsImpl_Release,
 169     IEnumPinsImpl_Next,
 170     IEnumPinsImpl_Skip,
 171     IEnumPinsImpl_Reset,
 172     IEnumPinsImpl_Clone
 173 };