reactos/dll/win32/winhttp/handle.c
Amine Khaldi 527f2f9057 [SHELL/EXPERIMENTS]
* Create a branch for some evul shell experiments.

svn path=/branches/shell-experiments/; revision=61927
2014-02-02 19:37:27 +00:00

148 lines
4.3 KiB
C

/*
* Copyright 2008 Hans Leidekker for CodeWeavers
*
* Based on the handle implementation from wininet.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "winhttp_private.h"
#define HANDLE_CHUNK_SIZE 0x10
static CRITICAL_SECTION handle_cs;
static CRITICAL_SECTION_DEBUG handle_cs_debug =
{
0, 0, &handle_cs,
{ &handle_cs_debug.ProcessLocksList, &handle_cs_debug.ProcessLocksList },
0, 0, { (ULONG_PTR)(__FILE__ ": handle_cs") }
};
static CRITICAL_SECTION handle_cs = { &handle_cs_debug, -1, 0, 0, 0, 0 };
static object_header_t **handles;
static ULONG_PTR next_handle;
static ULONG_PTR max_handles;
object_header_t *addref_object( object_header_t *hdr )
{
ULONG refs = InterlockedIncrement( &hdr->refs );
TRACE("%p -> refcount = %d\n", hdr, refs);
return hdr;
}
object_header_t *grab_object( HINTERNET hinternet )
{
object_header_t *hdr = NULL;
ULONG_PTR handle = (ULONG_PTR)hinternet;
EnterCriticalSection( &handle_cs );
if ((handle > 0) && (handle <= max_handles) && handles[handle - 1])
hdr = addref_object( handles[handle - 1] );
LeaveCriticalSection( &handle_cs );
TRACE("handle 0x%lx -> %p\n", handle, hdr);
return hdr;
}
void release_object( object_header_t *hdr )
{
ULONG refs = InterlockedDecrement( &hdr->refs );
TRACE("object %p refcount = %d\n", hdr, refs);
if (!refs)
{
if (hdr->type == WINHTTP_HANDLE_TYPE_REQUEST) close_connection( (request_t *)hdr );
send_callback( hdr, WINHTTP_CALLBACK_STATUS_HANDLE_CLOSING, &hdr->handle, sizeof(HINTERNET) );
TRACE("destroying object %p\n", hdr);
if (hdr->type != WINHTTP_HANDLE_TYPE_SESSION) list_remove( &hdr->entry );
hdr->vtbl->destroy( hdr );
}
}
HINTERNET alloc_handle( object_header_t *hdr )
{
object_header_t **p;
ULONG_PTR handle = 0, num;
list_init( &hdr->children );
EnterCriticalSection( &handle_cs );
if (!max_handles)
{
num = HANDLE_CHUNK_SIZE;
if (!(p = heap_alloc_zero( sizeof(ULONG_PTR) * num ))) goto end;
handles = p;
max_handles = num;
}
if (max_handles == next_handle)
{
num = max_handles * 2;
if (!(p = heap_realloc_zero( handles, sizeof(ULONG_PTR) * num ))) goto end;
handles = p;
max_handles = num;
}
handle = next_handle;
if (handles[handle]) ERR("handle isn't free but should be\n");
handles[handle] = addref_object( hdr );
while (handles[next_handle] && (next_handle < max_handles)) next_handle++;
end:
LeaveCriticalSection( &handle_cs );
return hdr->handle = (HINTERNET)(handle + 1);
}
BOOL free_handle( HINTERNET hinternet )
{
BOOL ret = FALSE;
ULONG_PTR handle = (ULONG_PTR)hinternet;
object_header_t *hdr = NULL, *child, *next;
EnterCriticalSection( &handle_cs );
if ((handle > 0) && (handle <= max_handles))
{
handle--;
if (handles[handle])
{
hdr = handles[handle];
TRACE("destroying handle 0x%lx for object %p\n", handle + 1, hdr);
handles[handle] = NULL;
ret = TRUE;
}
}
LeaveCriticalSection( &handle_cs );
if (hdr)
{
LIST_FOR_EACH_ENTRY_SAFE( child, next, &hdr->children, object_header_t, entry )
{
TRACE("freeing child handle %p for parent handle 0x%lx\n", child->handle, handle + 1);
free_handle( child->handle );
}
release_object( hdr );
}
EnterCriticalSection( &handle_cs );
if (next_handle > handle && !handles[handle]) next_handle = handle;
LeaveCriticalSection( &handle_cs );
return ret;
}