dlls/crypt32/proplist.c

   1 /*
   2  * Copyright 2004-2006 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 "wine/list.h"
  25 #include "crypt32_private.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
  28
  29 typedef struct _CONTEXT_PROPERTY_LIST
  30 {
  31     CRITICAL_SECTION cs;
  32     struct list      properties;
  33 } CONTEXT_PROPERTY_LIST;
  34
  35 typedef struct _CONTEXT_PROPERTY
  36 {
  37     DWORD       propID;
  38     DWORD       cbData;
  39     LPBYTE      pbData;
  40     struct list entry;
  41 } CONTEXT_PROPERTY, *PCONTEXT_PROPERTY;
  42
  43 PCONTEXT_PROPERTY_LIST ContextPropertyList_Create(void)
  44 {
  45     PCONTEXT_PROPERTY_LIST list = CryptMemAlloc(sizeof(CONTEXT_PROPERTY_LIST));
  46
  47     if (list)
  48     {
  49         InitializeCriticalSection(&list->cs);
  50         list->cs.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PCONTEXT_PROPERTY_LIST->cs");
  51         list_init(&list->properties);
  52     }
  53     return list;
  54 }
  55
  56 void ContextPropertyList_Free(PCONTEXT_PROPERTY_LIST list)
  57 {
  58     PCONTEXT_PROPERTY prop, next;
  59
  60     LIST_FOR_EACH_ENTRY_SAFE(prop, next, &list->properties, CONTEXT_PROPERTY,
  61      entry)
  62     {
  63         list_remove(&prop->entry);
  64         CryptMemFree(prop->pbData);
  65         CryptMemFree(prop);
  66     }
  67     list->cs.DebugInfo->Spare[0] = 0;
  68     DeleteCriticalSection(&list->cs);
  69     CryptMemFree(list);
  70 }
  71
  72 BOOL ContextPropertyList_FindProperty(PCONTEXT_PROPERTY_LIST list, DWORD id,
  73  PCRYPT_DATA_BLOB blob)
  74 {
  75     PCONTEXT_PROPERTY prop;
  76     BOOL ret = FALSE;
  77
  78     TRACE("(%p, %d, %p)\n", list, id, blob);
  79
  80     EnterCriticalSection(&list->cs);
  81     LIST_FOR_EACH_ENTRY(prop, &list->properties, CONTEXT_PROPERTY, entry)
  82     {
  83         if (prop->propID == id)
  84         {
  85             blob->cbData = prop->cbData;
  86             blob->pbData = prop->pbData;
  87             ret = TRUE;
  88             break;
  89         }
  90     }
  91     LeaveCriticalSection(&list->cs);
  92     return ret;
  93 }
  94
  95 BOOL ContextPropertyList_SetProperty(PCONTEXT_PROPERTY_LIST list, DWORD id,
  96  const BYTE *pbData, size_t cbData)
  97 {
  98     LPBYTE data;
  99     BOOL ret = FALSE;
 100
 101     if (cbData)
 102     {
 103         data = CryptMemAlloc(cbData);
 104         if (data)
 105             memcpy(data, pbData, cbData);
 106     }
 107     else
 108         data = NULL;
 109     if (!cbData || data)
 110     {
 111         PCONTEXT_PROPERTY prop;
 112         BOOL found = FALSE;
 113
 114         EnterCriticalSection(&list->cs);
 115         LIST_FOR_EACH_ENTRY(prop, &list->properties, CONTEXT_PROPERTY, entry)
 116         {
 117             if (prop->propID == id)
 118             {
 119                 found = TRUE;
 120                 break;
 121             }
 122         }
 123         if (found)
 124         {
 125             CryptMemFree(prop->pbData);
 126             prop->cbData = cbData;
 127             prop->pbData = data;
 128             ret = TRUE;
 129         }
 130         else
 131         {
 132             prop = CryptMemAlloc(sizeof(CONTEXT_PROPERTY));
 133             if (prop)
 134             {
 135                 prop->propID = id;
 136                 prop->cbData = cbData;
 137                 prop->pbData = data;
 138                 list_add_tail(&list->properties, &prop->entry);
 139                 ret = TRUE;
 140             }
 141             else
 142                 CryptMemFree(data);
 143         }
 144         LeaveCriticalSection(&list->cs);
 145     }
 146     return ret;
 147 }
 148
 149 void ContextPropertyList_RemoveProperty(PCONTEXT_PROPERTY_LIST list, DWORD id)
 150 {
 151     PCONTEXT_PROPERTY prop, next;
 152
 153     EnterCriticalSection(&list->cs);
 154     LIST_FOR_EACH_ENTRY_SAFE(prop, next, &list->properties, CONTEXT_PROPERTY,
 155      entry)
 156     {
 157         if (prop->propID == id)
 158         {
 159             list_remove(&prop->entry);
 160             CryptMemFree(prop->pbData);
 161             CryptMemFree(prop);
 162             break;
 163         }
 164     }
 165     LeaveCriticalSection(&list->cs);
 166 }
 167
 168 /* Since the properties are stored in a list, this is a tad inefficient
 169  * (O(n^2)) since I have to find the previous position every time.
 170  */
 171 DWORD ContextPropertyList_EnumPropIDs(PCONTEXT_PROPERTY_LIST list, DWORD id)
 172 {
 173     DWORD ret;
 174
 175     EnterCriticalSection(&list->cs);
 176     if (id)
 177     {
 178         PCONTEXT_PROPERTY cursor = NULL;
 179
 180         LIST_FOR_EACH_ENTRY(cursor, &list->properties, CONTEXT_PROPERTY, entry)
 181         {
 182             if (cursor->propID == id)
 183                 break;
 184         }
 185         if (cursor)
 186         {
 187             if (cursor->entry.next != &list->properties)
 188                 ret = LIST_ENTRY(cursor->entry.next, CONTEXT_PROPERTY,
 189                  entry)->propID;
 190             else
 191                 ret = 0;
 192         }
 193         else
 194             ret = 0;
 195     }
 196     else if (!list_empty(&list->properties))
 197         ret = LIST_ENTRY(list->properties.next, CONTEXT_PROPERTY,
 198          entry)->propID;
 199     else
 200         ret = 0;
 201     LeaveCriticalSection(&list->cs);
 202     return ret;
 203 }
 204
 205 void ContextPropertyList_Copy(PCONTEXT_PROPERTY_LIST to,
 206  PCONTEXT_PROPERTY_LIST from)
 207 {
 208     PCONTEXT_PROPERTY prop;
 209
 210     EnterCriticalSection(&from->cs);
 211     LIST_FOR_EACH_ENTRY(prop, &from->properties, CONTEXT_PROPERTY, entry)
 212     {
 213         ContextPropertyList_SetProperty(to, prop->propID, prop->pbData,
 214          prop->cbData);
 215     }
 216     LeaveCriticalSection(&from->cs);
 217 }