dlls/quartz/enummoniker.c

   1 /*
   2  * IEnumMoniker implementation
   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 #define COBJMACROS
  22
  23 #include "quartz_private.h"
  24
  25 #include "wine/debug.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
  28
  29 typedef struct EnumMonikerImpl
  30 {
  31     IEnumMoniker IEnumMoniker_iface;
  32     LONG ref;
  33     IMoniker ** ppMoniker;
  34     ULONG nMonikerCount;
  35     ULONG index;
  36 } EnumMonikerImpl;
  37
  38 static const IEnumMonikerVtbl EnumMonikerImpl_Vtbl;
  39
  40 static inline EnumMonikerImpl *impl_from_IEnumMoniker(IEnumMoniker *iface)
  41 {
  42     return CONTAINING_RECORD(iface, EnumMonikerImpl, IEnumMoniker_iface);
  43 }
  44
  45 static ULONG WINAPI EnumMonikerImpl_AddRef(LPENUMMONIKER iface);
  46
  47 HRESULT EnumMonikerImpl_Create(IMoniker ** ppMoniker, ULONG nMonikerCount, IEnumMoniker ** ppEnum)
  48 {
  49     /* NOTE: assumes that array of IMonikers has already been AddRef'd
  50      * I.e. this function does not AddRef the array of incoming
  51      * IMonikers */
  52     EnumMonikerImpl * pemi = CoTaskMemAlloc(sizeof(EnumMonikerImpl));
  53
  54     TRACE("(%p, %d, %p)\n", ppMoniker, nMonikerCount, ppEnum);
  55
  56     *ppEnum = NULL;
  57
  58     if (!pemi)
  59         return E_OUTOFMEMORY;
  60
  61     pemi->IEnumMoniker_iface.lpVtbl = &EnumMonikerImpl_Vtbl;
  62     pemi->ref = 1;
  63     pemi->ppMoniker = CoTaskMemAlloc(nMonikerCount * sizeof(IMoniker*));
  64     memcpy(pemi->ppMoniker, ppMoniker, nMonikerCount*sizeof(IMoniker*));
  65     pemi->nMonikerCount = nMonikerCount;
  66     pemi->index = 0;
  67
  68     *ppEnum = &pemi->IEnumMoniker_iface;
  69
  70     return S_OK;
  71 }
  72
  73 /**********************************************************************
  74  * IEnumMoniker_QueryInterface (also IUnknown)
  75  */
  76 static HRESULT WINAPI EnumMonikerImpl_QueryInterface(
  77     LPENUMMONIKER iface,
  78     REFIID riid,
  79     LPVOID *ppvObj)
  80 {
  81     EnumMonikerImpl *This = impl_from_IEnumMoniker(iface);
  82     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
  83
  84     if (This == NULL || ppvObj == NULL) return E_POINTER;
  85
  86     if (IsEqualGUID(riid, &IID_IUnknown) ||
  87         IsEqualGUID(riid, &IID_IEnumMoniker))
  88     {
  89         *ppvObj = iface;
  90         EnumMonikerImpl_AddRef(iface);
  91         return S_OK;
  92     }
  93
  94     *ppvObj = NULL;
  95     FIXME("- no interface\n\tIID:\t%s\n", debugstr_guid(riid));
  96     return E_NOINTERFACE;
  97 }
  98
  99 /**********************************************************************
 100  * IEnumMoniker_AddRef (also IUnknown)
 101  */
 102 static ULONG WINAPI EnumMonikerImpl_AddRef(LPENUMMONIKER iface)
 103 {
 104     EnumMonikerImpl *This = impl_from_IEnumMoniker(iface);
 105     ULONG ref;
 106
 107     if (This == NULL) return E_POINTER;
 108
 109     ref = InterlockedIncrement(&This->ref);
 110
 111     TRACE("(%p)->() AddRef from %d\n", iface, ref - 1);
 112
 113     return ref;
 114 }
 115
 116 /**********************************************************************
 117  * IEnumMoniker_Release (also IUnknown)
 118  */
 119 static ULONG WINAPI EnumMonikerImpl_Release(LPENUMMONIKER iface)
 120 {
 121     EnumMonikerImpl *This = impl_from_IEnumMoniker(iface);
 122     ULONG ref = InterlockedDecrement(&This->ref);
 123
 124     TRACE("(%p)->() Release from %d\n", iface, ref + 1);
 125
 126     if (!ref)
 127     {
 128         ULONG i;
 129
 130         for (i = 0; i < This->nMonikerCount; i++)
 131             IMoniker_Release(This->ppMoniker[i]);
 132
 133         CoTaskMemFree(This->ppMoniker);
 134         This->ppMoniker = NULL;
 135         CoTaskMemFree(This);
 136         return 0;
 137     }
 138     return ref;
 139 }
 140
 141 static HRESULT WINAPI EnumMonikerImpl_Next(LPENUMMONIKER iface, ULONG celt, IMoniker ** rgelt, ULONG * pceltFetched)
 142 {
 143     ULONG fetched;
 144     EnumMonikerImpl *This = impl_from_IEnumMoniker(iface);
 145
 146     TRACE("(%p)->(%d, %p, %p)\n", iface, celt, rgelt, pceltFetched);
 147
 148     for (fetched = 0; (This->index + fetched < This->nMonikerCount) && (fetched < celt); fetched++)
 149     {
 150         rgelt[fetched] = This->ppMoniker[This->index + fetched];
 151         IMoniker_AddRef(rgelt[fetched]);
 152     }
 153
 154     This->index += fetched;
 155
 156     TRACE("-- fetched %d\n", fetched);
 157
 158     if (pceltFetched)
 159         *pceltFetched = fetched;
 160
 161     if (fetched != celt)
 162         return S_FALSE;
 163     else
 164         return S_OK;
 165 }
 166
 167 static HRESULT WINAPI EnumMonikerImpl_Skip(LPENUMMONIKER iface, ULONG celt)
 168 {
 169     EnumMonikerImpl *This = impl_from_IEnumMoniker(iface);
 170
 171     TRACE("(%p)->(%d)\n", iface, celt);
 172
 173     This->index += celt;
 174
 175     return S_OK;
 176 }
 177
 178 static HRESULT WINAPI EnumMonikerImpl_Reset(LPENUMMONIKER iface)
 179 {
 180     EnumMonikerImpl *This = impl_from_IEnumMoniker(iface);
 181
 182     TRACE("(%p)->()\n", iface);
 183
 184     This->index = 0;
 185
 186     return S_OK;
 187 }
 188
 189 static HRESULT WINAPI EnumMonikerImpl_Clone(LPENUMMONIKER iface, IEnumMoniker ** ppenum)
 190 {
 191     FIXME("(%p)->(%p): stub\n", iface, ppenum);
 192
 193     return E_NOTIMPL;
 194 }
 195
 196 /**********************************************************************
 197  * IEnumMoniker_Vtbl
 198  */
 199 static const IEnumMonikerVtbl EnumMonikerImpl_Vtbl =
 200 {
 201     EnumMonikerImpl_QueryInterface,
 202     EnumMonikerImpl_AddRef,
 203     EnumMonikerImpl_Release,
 204     EnumMonikerImpl_Next,
 205     EnumMonikerImpl_Skip,
 206     EnumMonikerImpl_Reset,
 207     EnumMonikerImpl_Clone
 208 };