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 "ws2tcpip.h"
  23 #include <stdarg.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "winhttp.h"
  28
  29 #include "wine/debug.h"
  30 #include "winhttp_private.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(winhttp);
  33
  34 #define HANDLE_CHUNK_SIZE 0x10
  35
  36 static CRITICAL_SECTION handle_cs;
  37 static CRITICAL_SECTION_DEBUG handle_cs_debug =
  38 {
  39     0, 0, &handle_cs,
  40     { &handle_cs_debug.ProcessLocksList, &handle_cs_debug.ProcessLocksList },
  41       0, 0, { (ULONG_PTR)(__FILE__ ": handle_cs") }
  42 };
  43 static CRITICAL_SECTION handle_cs = { &handle_cs_debug, -1, 0, 0, 0, 0 };
  44
  45 static struct object_header **handles;
  46 static ULONG_PTR next_handle;
  47 static ULONG_PTR max_handles;
  48
  49 struct object_header *addref_object( struct object_header *hdr )
  50 {
  51     ULONG refs = InterlockedIncrement( &hdr->refs );
  52     TRACE("%p -> refcount = %d\n", hdr, refs);
  53     return hdr;
  54 }
  55
  56 struct object_header *grab_object( HINTERNET hinternet )
  57 {
  58     struct object_header *hdr = NULL;
  59     ULONG_PTR handle = (ULONG_PTR)hinternet;
  60
  61     EnterCriticalSection( &handle_cs );
  62
  63     if ((handle > 0) && (handle <= max_handles) && handles[handle - 1])
  64         hdr = addref_object( handles[handle - 1] );
  65
  66     LeaveCriticalSection( &handle_cs );
  67
  68     TRACE("handle 0x%lx -> %p\n", handle, hdr);
  69     return hdr;
  70 }
  71
  72 void release_object( struct object_header *hdr )
  73 {
  74     ULONG refs = InterlockedDecrement( &hdr->refs );
  75     TRACE("object %p refcount = %d\n", hdr, refs);
  76     if (!refs)
  77     {
  78         if (hdr->type == WINHTTP_HANDLE_TYPE_REQUEST) close_connection( (struct request *)hdr );
  79
  80         send_callback( hdr, WINHTTP_CALLBACK_STATUS_HANDLE_CLOSING, &hdr->handle, sizeof(HINTERNET) );
  81
  82         TRACE("destroying object %p\n", hdr);
  83         if (hdr->type != WINHTTP_HANDLE_TYPE_SESSION) list_remove( &hdr->entry );
  84         hdr->vtbl->destroy( hdr );
  85     }
  86 }
  87
  88 HINTERNET alloc_handle( struct object_header *hdr )
  89 {
  90     struct object_header **p;
  91     ULONG_PTR handle, num;
  92
  93     list_init( &hdr->children );
  94     hdr->handle = NULL;
  95
  96     EnterCriticalSection( &handle_cs );
  97     if (!max_handles)
  98     {
  99         num = HANDLE_CHUNK_SIZE;
 100         if (!(p = heap_alloc_zero( sizeof(ULONG_PTR) * num ))) goto end;
 101         handles = p;
 102         max_handles = num;
 103     }
 104     if (max_handles == next_handle)
 105     {
 106         num = max_handles * 2;
 107         if (!(p = heap_realloc_zero( handles, sizeof(ULONG_PTR) * num ))) goto end;
 108         handles = p;
 109         max_handles = num;
 110     }
 111     handle = next_handle;
 112     if (handles[handle]) ERR("handle isn't free but should be\n");
 113
 114     handles[handle] = addref_object( hdr );
 115     hdr->handle = (HINTERNET)(handle + 1);
 116     while ((next_handle < max_handles) && handles[next_handle]) next_handle++;
 117
 118 end:
 119     LeaveCriticalSection( &handle_cs );
 120     return hdr->handle;
 121 }
 122
 123 BOOL free_handle( HINTERNET hinternet )
 124 {
 125     BOOL ret = FALSE;
 126     ULONG_PTR handle = (ULONG_PTR)hinternet;
 127     struct object_header *hdr = NULL, *child, *next;
 128
 129     EnterCriticalSection( &handle_cs );
 130
 131     if ((handle > 0) && (handle <= max_handles))
 132     {
 133         handle--;
 134         if (handles[handle])
 135         {
 136             hdr = handles[handle];
 137             TRACE("destroying handle 0x%lx for object %p\n", handle + 1, hdr);
 138             handles[handle] = NULL;
 139             ret = TRUE;
 140         }
 141     }
 142
 143     LeaveCriticalSection( &handle_cs );
 144
 145     if (hdr)
 146     {
 147         LIST_FOR_EACH_ENTRY_SAFE( child, next, &hdr->children, struct object_header, entry )
 148         {
 149             TRACE("freeing child handle %p for parent handle 0x%lx\n", child->handle, handle + 1);
 150             free_handle( child->handle );
 151         }
 152         release_object( hdr );
 153     }
 154
 155     EnterCriticalSection( &handle_cs );
 156     if (next_handle > handle && !handles[handle]) next_handle = handle;
 157     LeaveCriticalSection( &handle_cs );
 158
 159     return ret;
 160 }