2 * IEnum* implementation
4 * Copyright 2006 Mike McCormack
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.
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.
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
28 #include "wine/list.h"
29 #include "wine/debug.h"
31 WINE_DEFAULT_DEBUG_CHANNEL(ole);
33 typedef struct tagEnumSTATPROPSETSTG_impl
43 /************************************************************************
44 * enumx_QueryInterface
46 HRESULT WINAPI enumx_QueryInterface(
51 if ( (This==0) || (ppvObject==0) )
56 if (IsEqualGUID(&IID_IUnknown, riid) ||
57 IsEqualGUID(&This->riid, riid))
59 IUnknown_AddRef(((IUnknown*)This));
67 /************************************************************************
70 ULONG WINAPI enumx_AddRef(enumx_impl *This)
72 return InterlockedIncrement(&This->ref);
75 /************************************************************************
78 ULONG WINAPI enumx_Release(enumx_impl *This)
82 ref = InterlockedDecrement(&This->ref);
85 while (!list_empty(&This->elements))
87 struct list *x = list_head(&This->elements);
89 HeapFree(GetProcessHeap(), 0, x);
91 HeapFree(GetProcessHeap(), 0, This);
96 /************************************************************************
99 HRESULT WINAPI enumx_Next(enumx_impl *This, ULONG celt,
100 void *rgelt, ULONG *pceltFetched)
105 TRACE("%p %u %p\n", This, celt, pceltFetched);
107 if (This->current == NULL)
108 This->current = list_head(&This->elements);
110 while (count < celt && This->current && This->current != &This->elements)
112 memcpy(p, &This->current[1], This->elem_size);
113 p += This->elem_size;
114 This->current = This->current->next;
118 *pceltFetched = count;
124 /************************************************************************
127 HRESULT WINAPI enumx_Skip(enumx_impl *This, ULONG celt)
131 TRACE("%p %u\n", This, celt);
133 if (This->current == NULL)
134 This->current = list_head(&This->elements);
136 while (count < celt && This->current && This->current != &This->elements)
142 /************************************************************************
145 HRESULT WINAPI enumx_Reset(enumx_impl *This)
149 This->current = NULL;
153 /************************************************************************
156 HRESULT WINAPI enumx_Clone(
164 /************************************************************************
167 * Allocate a generic enumerator
169 enumx_impl *enumx_allocate(REFIID riid, const void *vtbl, ULONG elem_size)
173 enumx = HeapAlloc(GetProcessHeap(), 0, sizeof *enumx);
178 enumx->current = NULL;
179 enumx->elem_size = elem_size;
180 memcpy(&enumx->riid, riid, sizeof *riid);
181 list_init(&enumx->elements);
187 /************************************************************************
190 * Add an element to the enumeration.
192 void *enumx_add_element(enumx_impl *enumx, const void *data)
194 struct list *element;
196 element = HeapAlloc(GetProcessHeap(), 0, sizeof *element + enumx->elem_size);
199 memcpy(&element[1], data, enumx->elem_size);
200 list_add_tail(&enumx->elements, element);