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 context_t *ContextList_Add(ContextList *list, CRITICAL_SECTION *cs, context_t *toLink,
 114  context_t *existing, struct WINE_CRYPTCERTSTORE *store, BOOL use_link)
 115 {
 116     context_t *context;
 117
 118     TRACE("(%p, %p, %p)\n", list, toLink, existing);
 119
 120     context = toLink->vtbl->clone(toLink, store, use_link);
 121     if (context)
 122     {
 123         TRACE("adding %p\n", context);
 124         EnterCriticalSection(cs);
 125         if (existing)
 126         {
 127             context->u.entry.prev = existing->u.entry.prev;
 128             context->u.entry.next = existing->u.entry.next;
 129             context->u.entry.prev->next = &context->u.entry;
 130             context->u.entry.next->prev = &context->u.entry;
 131             list_init(&existing->u.entry);
 132             Context_Release(existing);
 133         }
 134         else
 135             list_add_head(list, &context->u.entry);
 136         LeaveCriticalSection(cs);
 137     }
 138     return context;
 139 }
 140
 141 context_t *ContextList_Enum(ContextList *list, CRITICAL_SECTION *cs, context_t *prev)
 142 {
 143     struct list *listNext;
 144     context_t *ret;
 145
 146     EnterCriticalSection(cs);
 147     if (prev)
 148     {
 149         listNext = list_next(list, &prev->u.entry);
 150         Context_Release(prev);
 151     }
 152     else
 153         listNext = list_next(list, list);
 154     LeaveCriticalSection(cs);
 155
 156     if (listNext)
 157     {
 158         ret = LIST_ENTRY(listNext, context_t, u.entry);
 159         Context_AddRef(ret);
 160     }
 161     else
 162         ret = NULL;
 163     return ret;
 164 }
 165
 166 BOOL ContextList_Remove(ContextList *list, CRITICAL_SECTION *cs, context_t *context)
 167 {
 168     BOOL inList = FALSE;
 169
 170     EnterCriticalSection(cs);
 171     if (!list_empty(&context->u.entry))
 172     {
 173         list_remove(&context->u.entry);
 174         list_init(&context->u.entry);
 175         inList = TRUE;
 176     }
 177     LeaveCriticalSection(cs);
 178
 179     return inList;
 180 }
 181
 182 void ContextList_Free(ContextList *list)
 183 {
 184     context_t *context, *next;
 185
 186     LIST_FOR_EACH_ENTRY_SAFE(context, next, list, context_t, u.entry)
 187     {
 188         TRACE("removing %p\n", context);
 189         list_remove(&context->u.entry);
 190         Context_Release(context);
 191     }
 192 }