dlls/crypt32/context.c

   1 /*
   2  * Copyright 2006 Juan Lang
   3  *
   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.
   8  *
   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.
  13  *
  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
  17  */
  18 #include <assert.h>
  19 #include <stdarg.h>
  20 #include "windef.h"
  21 #include "winbase.h"
  22 #include "wincrypt.h"
  23 #include "wine/debug.h"
  24 #include "crypt32_private.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(context);
  27
  28 void *Context_CreateDataContext(size_t contextSize, const context_vtbl_t *vtbl)
  29 {
  30     context_t *context;
  31
  32     context = CryptMemAlloc(sizeof(context_t) + contextSize);
  33     if (!context)
  34         return NULL;
  35
  36     context->vtbl = vtbl;
  37     context->ref = 1;
  38     context->linked = NULL;
  39     context->properties = ContextPropertyList_Create();
  40     if (!context->properties)
  41     {
  42         CryptMemFree(context);
  43         return NULL;
  44     }
  45
  46     TRACE("returning %p\n", context);
  47     return context_ptr(context);
  48 }
  49
  50 context_t *Context_CreateLinkContext(unsigned int contextSize, context_t *linked)
  51 {
  52     context_t *context;
  53
  54     TRACE("(%d, %p)\n", contextSize, linked);
  55
  56     context = CryptMemAlloc(sizeof(context_t) + contextSize);
  57     if (!context)
  58         return NULL;
  59
  60     memcpy(context_ptr(context), context_ptr(linked), contextSize);
  61     context->vtbl = linked->vtbl;
  62     context->ref = 1;
  63     context->linked = linked;
  64     context->properties = linked->properties;
  65     Context_AddRef(linked);
  66
  67     TRACE("returning %p\n", context);
  68     return context;
  69 }
  70
  71 void Context_AddRef(context_t *context)
  72 {
  73     InterlockedIncrement(&context->ref);
  74     TRACE("(%p) ref=%d\n", context, context->ref);
  75 }
  76
  77 BOOL Context_Release(context_t *context)
  78 {
  79     BOOL ret = TRUE;
  80
  81     if (context->ref <= 0)
  82     {
  83         ERR("%p's ref count is %d\n", context, context->ref);
  84         return FALSE;
  85     }
  86     if (InterlockedDecrement(&context->ref) == 0)
  87     {
  88         TRACE("freeing %p\n", context);
  89         if (!context->linked)
  90         {
  91             ContextPropertyList_Free(context->properties);
  92             context->vtbl->free(context);
  93         } else {
  94             Context_Release(context->linked);
  95         }
  96         CryptMemFree(context);
  97     }
  98     else
  99         TRACE("%p's ref count is %d\n", context, context->ref);
 100     return ret;
 101 }
 102
 103 void Context_CopyProperties(const void *to, const void *from)
 104 {
 105     CONTEXT_PROPERTY_LIST *toProperties, *fromProperties;
 106
 107     toProperties = context_from_ptr(to)->properties;
 108     fromProperties = context_from_ptr(from)->properties;
 109     assert(toProperties && fromProperties);
 110     ContextPropertyList_Copy(toProperties, fromProperties);
 111 }
 112
 113 struct ContextList
 114 {
 115     CRITICAL_SECTION cs;
 116     struct list contexts;
 117 };
 118
 119 struct ContextList *ContextList_Create(void)
 120 {
 121     struct ContextList *list = CryptMemAlloc(sizeof(struct ContextList));
 122
 123     if (list)
 124     {
 125         InitializeCriticalSection(&list->cs);
 126         list->cs.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": ContextList.cs");
 127         list_init(&list->contexts);
 128     }
 129     return list;
 130 }
 131
 132 context_t *ContextList_Add(struct ContextList *list, context_t *toLink, context_t *existing, struct WINE_CRYPTCERTSTORE *store, BOOL use_link)
 133 {
 134     context_t *context;
 135
 136     TRACE("(%p, %p, %p)\n", list, toLink, existing);
 137
 138     context = toLink->vtbl->clone(toLink, store, use_link);
 139     if (context)
 140     {
 141         TRACE("adding %p\n", context);
 142         EnterCriticalSection(&list->cs);
 143         if (existing)
 144         {
 145             context->u.entry.prev = existing->u.entry.prev;
 146             context->u.entry.next = existing->u.entry.next;
 147             context->u.entry.prev->next = &context->u.entry;
 148             context->u.entry.next->prev = &context->u.entry;
 149             list_init(&existing->u.entry);
 150             Context_Release(existing);
 151         }
 152         else
 153             list_add_head(&list->contexts, &context->u.entry);
 154         LeaveCriticalSection(&list->cs);
 155     }
 156     return context;
 157 }
 158
 159 context_t *ContextList_Enum(struct ContextList *list, context_t *prev)
 160 {
 161     struct list *listNext;
 162     context_t *ret;
 163
 164     EnterCriticalSection(&list->cs);
 165     if (prev)
 166     {
 167         listNext = list_next(&list->contexts, &prev->u.entry);
 168         Context_Release(prev);
 169     }
 170     else
 171         listNext = list_next(&list->contexts, &list->contexts);
 172     LeaveCriticalSection(&list->cs);
 173
 174     if (listNext)
 175     {
 176         ret = LIST_ENTRY(listNext, context_t, u.entry);
 177         Context_AddRef(ret);
 178     }
 179     else
 180         ret = NULL;
 181     return ret;
 182 }
 183
 184 BOOL ContextList_Remove(struct ContextList *list, context_t *context)
 185 {
 186     BOOL inList = FALSE;
 187
 188     EnterCriticalSection(&list->cs);
 189     if (!list_empty(&context->u.entry))
 190     {
 191         list_remove(&context->u.entry);
 192         list_init(&context->u.entry);
 193         inList = TRUE;
 194     }
 195     LeaveCriticalSection(&list->cs);
 196
 197     return inList;
 198 }
 199
 200 static void ContextList_Empty(struct ContextList *list)
 201 {
 202     context_t *context, *next;
 203
 204     EnterCriticalSection(&list->cs);
 205     LIST_FOR_EACH_ENTRY_SAFE(context, next, &list->contexts, context_t, u.entry)
 206     {
 207         TRACE("removing %p\n", context);
 208         list_remove(&context->u.entry);
 209         Context_Release(context);
 210     }
 211     LeaveCriticalSection(&list->cs);
 212 }
 213
 214 void ContextList_Free(struct ContextList *list)
 215 {
 216     ContextList_Empty(list);
 217     list->cs.DebugInfo->Spare[0] = 0;
 218     DeleteCriticalSection(&list->cs);
 219     CryptMemFree(list);
 220 }