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 = 0, num;
  93
  94     list_init( &hdr->children );
  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 + HANDLE_CHUNK_SIZE;
 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     while (handles[next_handle] && (next_handle < max_handles)) next_handle++;
 116
 117 end:
 118     LeaveCriticalSection( &handle_cs );
 119     return hdr->handle = (HINTERNET)(handle + 1);
 120 }
 121
 122 BOOL free_handle( HINTERNET hinternet )
 123 {
 124     BOOL ret = FALSE;
 125     ULONG_PTR handle = (ULONG_PTR)hinternet;
 126     object_header_t *hdr = NULL, *child, *next;
 127
 128     EnterCriticalSection( &handle_cs );
 129
 130     if ((handle > 0) && (handle <= max_handles))
 131     {
 132         handle--;
 133         if (handles[handle])
 134         {
 135             hdr = handles[handle];
 136             TRACE("destroying handle 0x%lx for object %p\n", handle + 1, hdr);
 137             handles[handle] = NULL;
 138             ret = TRUE;
 139         }
 140     }
 141
 142     LeaveCriticalSection( &handle_cs );
 143
 144     if (hdr)
 145     {
 146         LIST_FOR_EACH_ENTRY_SAFE( child, next, &hdr->children, object_header_t, entry )
 147         {
 148             TRACE("freeing child handle %p for parent handle 0x%lx\n", child->handle, handle + 1);
 149             free_handle( child->handle );
 150         }
 151         release_object( hdr );
 152     }
 153
 154     EnterCriticalSection( &handle_cs );
 155     if (next_handle > handle && !handles[handle]) next_handle = handle;
 156     LeaveCriticalSection( &handle_cs );
 157
 158     return ret;
 159 }