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 context_t *Context_CreateDataContext(size_t contextSize, const context_vtbl_t *vtbl, WINECRYPT_CERTSTORE *store)
  29 {
  30     context_t *context;
  31
  32     context = CryptMemAlloc(sizeof(context_t) + contextSize);
  33     if (!context)
  34         return NULL;
  35
  36     context->properties = ContextPropertyList_Create();
  37     if (!context->properties)
  38     {
  39         CryptMemFree(context);
  40         return NULL;
  41     }
  42
  43     context->vtbl = vtbl;
  44     context->ref = 1;
  45     context->linked = NULL;
  46
  47     store->vtbl->addref(store);
  48     context->store = store;
  49
  50     TRACE("returning %p\n", context);
  51     return context;
  52 }
  53
  54 context_t *Context_CreateLinkContext(unsigned int contextSize, context_t *linked, WINECRYPT_CERTSTORE *store)
  55 {
  56     context_t *context;
  57
  58     TRACE("(%d, %p)\n", contextSize, linked);
  59
  60     context = CryptMemAlloc(sizeof(context_t) + contextSize);
  61     if (!context)
  62         return NULL;
  63
  64     memcpy(context_ptr(context), context_ptr(linked), contextSize);
  65     context->vtbl = linked->vtbl;
  66     context->ref = 1;
  67     context->linked = linked;
  68     context->properties = linked->properties;
  69     Context_AddRef(linked);
  70
  71     store->vtbl->addref(store);
  72     context->store = store;
  73
  74     TRACE("returning %p\n", context);
  75     return context;
  76 }
  77
  78 void Context_AddRef(context_t *context)
  79 {
  80     LONG ref = InterlockedIncrement(&context->ref);
  81
  82     TRACE("(%p) ref=%ld\n", context, context->ref);
  83
  84     if(ref == 1) {
  85         /* This is the first external (non-store) reference. Increase store ref cnt. */
  86         context->store->vtbl->addref(context->store);
  87     }
  88 }
  89
  90 void Context_Free(context_t *context)
  91 {
  92     TRACE("(%p)\n", context);
  93
  94     assert(!context->ref);
  95
  96     if (!context->linked) {
  97         ContextPropertyList_Free(context->properties);
  98         context->vtbl->free(context);
  99     }else {
 100         Context_Release(context->linked);
 101     }
 102
 103     CryptMemFree(context);
 104 }
 105
 106 void Context_Release(context_t *context)
 107 {
 108     LONG ref = InterlockedDecrement(&context->ref);
 109
 110     TRACE("(%p) ref=%ld\n", context, ref);
 111     assert(ref >= 0);
 112
 113     if (!ref) {
 114         WINECRYPT_CERTSTORE *store = context->store;
 115
 116         /* This is the last reference, but the context still may be in a store.
 117          * We release our store reference, but leave it up to store to free or keep the context. */
 118         store->vtbl->releaseContext(store, context);
 119         store->vtbl->release(store, 0);
 120     }
 121 }
 122
 123 void Context_CopyProperties(const void *to, const void *from)
 124 {
 125     CONTEXT_PROPERTY_LIST *toProperties, *fromProperties;
 126
 127     toProperties = context_from_ptr(to)->properties;
 128     fromProperties = context_from_ptr(from)->properties;
 129     assert(toProperties && fromProperties);
 130     ContextPropertyList_Copy(toProperties, fromProperties);
 131 }