dlls/winhttp/handle.c

   1 /*
   2  * Copyright 2008 Hans Leidekker for CodeWeavers
   3  *
   4  * Based on the handle implementation from wininet.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23 #include "wine/debug.h"
  24
  25 #include <stdarg.h>
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winhttp.h"
  30
  31 #include "winhttp_private.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(winhttp);
  34
  35 #define HANDLE_CHUNK_SIZE 0x10
  36
  37 static CRITICAL_SECTION handle_cs;
  38 static CRITICAL_SECTION_DEBUG handle_cs_debug =
  39 {
  40     0, 0, &handle_cs,
  41     { &handle_cs_debug.ProcessLocksList, &handle_cs_debug.ProcessLocksList },
  42       0, 0, { (ULONG_PTR)(__FILE__ ": handle_cs") }
  43 };
  44 static CRITICAL_SECTION handle_cs = { &handle_cs_debug, -1, 0, 0, 0, 0 };
  45
  46 static object_header_t **handles;
  47 static ULONG_PTR next_handle;
  48 static ULONG_PTR max_handles;
  49
  50 object_header_t *addref_object( object_header_t *hdr )
  51 {
  52     ULONG refs = InterlockedIncrement( &hdr->refs );
  53     TRACE("%p -> refcount = %d\n", hdr, refs);
  54     return hdr;
  55 }
  56
  57 object_header_t *grab_object( HINTERNET hinternet )
  58 {
  59     object_header_t *hdr = NULL;
  60     ULONG_PTR handle = (ULONG_PTR)hinternet;
  61
  62     EnterCriticalSection( &handle_cs );
  63
  64     if ((handle > 0) && (handle <= max_handles) && handles[handle - 1])
  65         hdr = addref_object( handles[handle - 1] );
  66
  67     LeaveCriticalSection( &handle_cs );
  68
  69     TRACE("handle 0x%lx -> %p\n", handle, hdr);
  70     return hdr;
  71 }
  72
  73 void release_object( object_header_t *hdr )
  74 {
  75     ULONG refs = InterlockedDecrement( &hdr->refs );
  76     TRACE("object %p refcount = %d\n", hdr, refs);
  77     if (!refs)
  78     {
  79         if (hdr->type == WINHTTP_HANDLE_TYPE_REQUEST) close_connection( (request_t *)hdr );
  80
  81         send_callback( hdr, WINHTTP_CALLBACK_STATUS_HANDLE_CLOSING, &hdr->handle, sizeof(HINTERNET) );
  82
  83         TRACE("destroying object %p\n", hdr);
  84         if (hdr->type != WINHTTP_HANDLE_TYPE_SESSION) list_remove( &hdr->entry );
  85         hdr->vtbl->destroy( hdr );
  86     }
  87 }
  88
  89 HINTERNET alloc_handle( object_header_t *hdr )
  90 {
  91     object_header_t **p;
  92     ULONG_PTR handle, num;
  93
  94     list_init( &hdr->children );
  95     hdr->handle = NULL;
  96
  97     EnterCriticalSection( &handle_cs );
  98     if (!max_handles)
  99     {
 100         num = HANDLE_CHUNK_SIZE;
 101         if (!(p = heap_alloc_zero( sizeof(ULONG_PTR) * num ))) goto end;
 102         handles = p;
 103         max_handles = num;
 104     }
 105     if (max_handles == next_handle)
 106     {
 107         num = max_handles * 2;
 108         if (!(p = heap_realloc_zero( handles, sizeof(ULONG_PTR) * num ))) goto end;
 109         handles = p;
 110         max_handles = num;
 111     }
 112     handle = next_handle;
 113     if (handles[handle]) ERR("handle isn't free but should be\n");
 114
 115     handles[handle] = addref_object( hdr );
 116     hdr->handle = (HINTERNET)(handle + 1);
 117     while ((next_handle < max_handles) && handles[next_handle]) next_handle++;
 118
 119 end:
 120     LeaveCriticalSection( &handle_cs );
 121     return hdr->handle;
 122 }
 123
 124 BOOL free_handle( HINTERNET hinternet )
 125 {
 126     BOOL ret = FALSE;
 127     ULONG_PTR handle = (ULONG_PTR)hinternet;
 128     object_header_t *hdr = NULL, *child, *next;
 129
 130     EnterCriticalSection( &handle_cs );
 131
 132     if ((handle > 0) && (handle <= max_handles))
 133     {
 134         handle--;
 135         if (handles[handle])
 136         {
 137             hdr = handles[handle];
 138             TRACE("destroying handle 0x%lx for object %p\n", handle + 1, hdr);
 139             handles[handle] = NULL;
 140             ret = TRUE;
 141         }
 142     }
 143
 144     LeaveCriticalSection( &handle_cs );
 145
 146     if (hdr)
 147     {
 148         LIST_FOR_EACH_ENTRY_SAFE( child, next, &hdr->children, object_header_t, entry )
 149         {
 150             TRACE("freeing child handle %p for parent handle 0x%lx\n", child->handle, handle + 1);
 151             free_handle( child->handle );
 152         }
 153         release_object( hdr );
 154     }
 155
 156     EnterCriticalSection( &handle_cs );
 157     if (next_handle > handle && !handles[handle]) next_handle = handle;
 158     LeaveCriticalSection( &handle_cs );
 159
 160     return ret;
 161 }