2 * Copyright 2006 Juan Lang
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #include "wine/debug.h"
24 #include "wine/list.h"
25 #include "crypt32_private.h"
27 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
29 typedef enum _ContextType {
34 typedef struct _BASE_CONTEXT
38 } BASE_CONTEXT, *PBASE_CONTEXT;
40 typedef struct _DATA_CONTEXT
43 ContextType type; /* always ContextTypeData */
44 PCONTEXT_PROPERTY_LIST properties;
45 } DATA_CONTEXT, *PDATA_CONTEXT;
47 typedef struct _LINK_CONTEXT
50 ContextType type; /* always ContextTypeLink */
52 } LINK_CONTEXT, *PLINK_CONTEXT;
54 #define CONTEXT_FROM_BASE_CONTEXT(p, s) ((LPBYTE)(p) - (s))
55 #define BASE_CONTEXT_FROM_CONTEXT(p, s) (PBASE_CONTEXT)((LPBYTE)(p) + (s))
57 void *Context_CreateDataContext(size_t contextSize)
59 void *ret = CryptMemAlloc(contextSize + sizeof(DATA_CONTEXT));
63 PDATA_CONTEXT context = (PDATA_CONTEXT)((LPBYTE)ret + contextSize);
66 context->type = ContextTypeData;
67 context->properties = ContextPropertyList_Create();
68 if (!context->properties)
77 void *Context_CreateLinkContext(unsigned int contextSize, void *linked, unsigned int extra,
80 void *context = CryptMemAlloc(contextSize + sizeof(LINK_CONTEXT) + extra);
82 TRACE("(%d, %p, %d)\n", contextSize, linked, extra);
86 PLINK_CONTEXT linkContext = (PLINK_CONTEXT)BASE_CONTEXT_FROM_CONTEXT(
87 context, contextSize);
88 PBASE_CONTEXT linkedBase = BASE_CONTEXT_FROM_CONTEXT(linked,
91 memcpy(context, linked, contextSize);
93 linkContext->type = ContextTypeLink;
94 linkContext->linked = linkedBase;
96 InterlockedIncrement(&linkedBase->ref);
97 TRACE("%p's ref count is %d\n", context, linkContext->ref);
102 void Context_AddRef(void *context, size_t contextSize)
104 PBASE_CONTEXT baseContext = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
106 InterlockedIncrement(&baseContext->ref);
109 void *Context_GetExtra(const void *context, size_t contextSize)
111 PBASE_CONTEXT baseContext = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
113 assert(baseContext->type == ContextTypeLink);
114 return (LPBYTE)baseContext + sizeof(LINK_CONTEXT);
117 void *Context_GetLinkedContext(void *context, size_t contextSize)
119 PBASE_CONTEXT baseContext = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
121 assert(baseContext->type == ContextTypeLink);
122 return CONTEXT_FROM_BASE_CONTEXT(((PLINK_CONTEXT)baseContext)->linked,
126 PCONTEXT_PROPERTY_LIST Context_GetProperties(void *context, size_t contextSize)
128 PBASE_CONTEXT ptr = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
130 while (ptr && ptr->type == ContextTypeLink)
131 ptr = ((PLINK_CONTEXT)ptr)->linked;
132 return (ptr && ptr->type == ContextTypeData) ?
133 ((PDATA_CONTEXT)ptr)->properties : NULL;
136 void Context_Release(void *context, size_t contextSize,
137 ContextFreeFunc dataContextFree)
139 PBASE_CONTEXT base = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
141 if (InterlockedDecrement(&base->ref) == 0)
143 TRACE("freeing %p\n", context);
146 case ContextTypeData:
147 ContextPropertyList_Free(((PDATA_CONTEXT)base)->properties);
148 dataContextFree(context);
150 case ContextTypeLink:
151 /* The linked context is of the same type as this, so release
152 * it as well, using the same offset and data free function.
154 Context_Release(CONTEXT_FROM_BASE_CONTEXT(
155 ((PLINK_CONTEXT)base)->linked, contextSize), contextSize,
161 CryptMemFree(context);
164 TRACE("%p's ref count is %d\n", context, base->ref);
167 void Context_CopyProperties(const void *to, const void *from,
170 PCONTEXT_PROPERTY_LIST toProperties, fromProperties;
172 toProperties = Context_GetProperties((void *)to, contextSize);
173 fromProperties = Context_GetProperties((void *)from, contextSize);
174 ContextPropertyList_Copy(toProperties, fromProperties);
179 PCWINE_CONTEXT_INTERFACE contextInterface;
182 struct list contexts;
185 struct ContextList *ContextList_Create(
186 PCWINE_CONTEXT_INTERFACE contextInterface, size_t contextSize)
188 struct ContextList *list = CryptMemAlloc(sizeof(struct ContextList));
192 list->contextInterface = contextInterface;
193 list->contextSize = contextSize;
194 InitializeCriticalSection(&list->cs);
195 list_init(&list->contexts);
200 static inline struct list *ContextList_ContextToEntry(struct ContextList *list,
206 ret = (struct list *)Context_GetExtra(context, list->contextSize);
212 static inline void *ContextList_EntryToContext(struct ContextList *list,
215 return (LPBYTE)entry - sizeof(LINK_CONTEXT) - list->contextSize;
218 void *ContextList_Add(struct ContextList *list, void *toLink, void *toReplace)
222 TRACE("(%p, %p, %p)\n", list, toLink, toReplace);
224 context = Context_CreateLinkContext(list->contextSize, toLink,
225 sizeof(struct list), TRUE);
228 struct list *entry = ContextList_ContextToEntry(list, context);
230 TRACE("adding %p\n", context);
231 EnterCriticalSection(&list->cs);
234 struct list *existing = ContextList_ContextToEntry(list, toReplace);
236 entry->prev = existing->prev;
237 entry->next = existing->next;
238 entry->prev->next = entry;
239 entry->next->prev = entry;
240 existing->prev = existing->next = existing;
241 list->contextInterface->free(toReplace);
244 list_add_tail(&list->contexts, entry);
245 LeaveCriticalSection(&list->cs);
250 void *ContextList_Enum(struct ContextList *list, void *pPrev)
252 struct list *listNext;
255 EnterCriticalSection(&list->cs);
258 struct list *prevEntry = ContextList_ContextToEntry(list, pPrev);
260 listNext = list_next(&list->contexts, prevEntry);
261 list->contextInterface->free(pPrev);
264 listNext = list_next(&list->contexts, &list->contexts);
265 LeaveCriticalSection(&list->cs);
269 ret = ContextList_EntryToContext(list, listNext);
270 list->contextInterface->duplicate(ret);
277 void ContextList_Delete(struct ContextList *list, void *context)
279 struct list *entry = ContextList_ContextToEntry(list, context);
281 EnterCriticalSection(&list->cs);
283 LeaveCriticalSection(&list->cs);
284 list->contextInterface->free(context);
287 void ContextList_Empty(struct ContextList *list)
289 struct list *entry, *next;
291 EnterCriticalSection(&list->cs);
292 LIST_FOR_EACH_SAFE(entry, next, &list->contexts)
294 const void *context = ContextList_EntryToContext(list, entry);
296 TRACE("removing %p\n", context);
298 list->contextInterface->free(context);
300 LeaveCriticalSection(&list->cs);
303 void ContextList_Free(struct ContextList *list)
305 ContextList_Empty(list);
306 DeleteCriticalSection(&list->cs);