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Sweden-Number/server/class.c

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/*
* Server-side window class management
*
* Copyright (C) 2002 Mike McCormack
* Copyright (C) 2003 Alexandre Julliard
*
* 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 "config.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "wine/list.h"
#include "request.h"
#include "object.h"
#include "process.h"
#include "user.h"
#include "winuser.h"
#include "winternl.h"
struct window_class
{
struct list entry; /* entry in process list */
struct process *process; /* process owning the class */
int count; /* reference count */
int local; /* local class? */
atom_t atom; /* class atom */
atom_t base_atom; /* base class atom for versioned class */
mod_handle_t instance; /* module instance */
unsigned int style; /* class style */
int win_extra; /* number of window extra bytes */
client_ptr_t client_ptr; /* pointer to class in client address space */
int nb_extra_bytes; /* number of extra bytes */
char extra_bytes[1]; /* extra bytes storage */
};
static struct window_class *create_class( struct process *process, int extra_bytes, int local )
{
struct window_class *class;
if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
class->process = (struct process *)grab_object( process );
class->count = 0;
class->local = local;
class->nb_extra_bytes = extra_bytes;
memset( class->extra_bytes, 0, extra_bytes );
/* other fields are initialized by caller */
/* local classes have priority so we put them first in the list */
if (local) list_add_head( &process->classes, &class->entry );
else list_add_tail( &process->classes, &class->entry );
return class;
}
static void destroy_class( struct window_class *class )
{
release_global_atom( NULL, class->atom );
release_global_atom( NULL, class->base_atom );
list_remove( &class->entry );
release_object( class->process );
free( class );
}
void destroy_process_classes( struct process *process )
{
struct list *ptr;
while ((ptr = list_head( &process->classes )))
{
struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
destroy_class( class );
}
}
static struct window_class *find_class( struct process *process, atom_t atom, mod_handle_t instance )
{
struct list *ptr;
LIST_FOR_EACH( ptr, &process->classes )
{
int is_win16;
struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
if (class->atom != atom) continue;
is_win16 = !(class->instance >> 16);
if (!instance || !class->local || class->instance == instance ||
(!is_win16 && ((class->instance & ~0xffff) == (instance & ~0xffff)))) return class;
}
return NULL;
}
struct window_class *grab_class( struct process *process, atom_t atom,
mod_handle_t instance, int *extra_bytes )
{
struct window_class *class = find_class( process, atom, instance );
if (class)
{
class->count++;
*extra_bytes = class->win_extra;
}
else set_error( STATUS_INVALID_HANDLE );
return class;
}
void release_class( struct window_class *class )
{
assert( class->count > 0 );
class->count--;
}
int is_desktop_class( struct window_class *class )
{
return (class->atom == DESKTOP_ATOM && !class->local);
}
int is_hwnd_message_class( struct window_class *class )
{
static const WCHAR messageW[] = {'M','e','s','s','a','g','e'};
static const struct unicode_str name = { messageW, sizeof(messageW) };
return (!class->local && class->atom == find_global_atom( NULL, &name ));
}
atom_t get_class_atom( struct window_class *class )
{
return class->base_atom;
}
client_ptr_t get_class_client_ptr( struct window_class *class )
{
return class->client_ptr;
}
/* create a window class */
DECL_HANDLER(create_class)
{
struct window_class *class;
struct unicode_str name = get_req_unicode_str();
atom_t atom, base_atom;
if (name.len)
{
atom = add_global_atom( NULL, &name );
if (!atom) return;
if (req->name_offset && req->name_offset < name.len / sizeof(WCHAR))
{
name.str += req->name_offset;
name.len -= req->name_offset * sizeof(WCHAR);
base_atom = add_global_atom( NULL, &name );
if (!base_atom)
{
release_global_atom( NULL, atom );
return;
}
}
else
{
base_atom = atom;
grab_global_atom( NULL, atom );
}
}
else
{
base_atom = atom = req->atom;
if (!grab_global_atom( NULL, atom )) return;
grab_global_atom( NULL, base_atom );
}
class = find_class( current->process, atom, req->instance );
if (class && !class->local == !req->local)
{
set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
release_global_atom( NULL, atom );
release_global_atom( NULL, base_atom );
return;
}
if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
{
/* don't allow stupid values here */
set_error( STATUS_INVALID_PARAMETER );
release_global_atom( NULL, atom );
release_global_atom( NULL, base_atom );
return;
}
if (!(class = create_class( current->process, req->extra, req->local )))
{
release_global_atom( NULL, atom );
release_global_atom( NULL, base_atom );
return;
}
class->atom = atom;
class->base_atom = base_atom;
class->instance = req->instance;
class->style = req->style;
class->win_extra = req->win_extra;
class->client_ptr = req->client_ptr;
reply->atom = atom;
}
/* destroy a window class */
DECL_HANDLER(destroy_class)
{
struct window_class *class;
struct unicode_str name = get_req_unicode_str();
atom_t atom = req->atom;
if (name.len) atom = find_global_atom( NULL, &name );
if (!(class = find_class( current->process, atom, req->instance )))
set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
else if (class->count)
set_win32_error( ERROR_CLASS_HAS_WINDOWS );
else
{
reply->client_ptr = class->client_ptr;
destroy_class( class );
}
}
/* set some information in a class */
DECL_HANDLER(set_class_info)
{
struct window_class *class = get_window_class( req->window );
if (!class) return;
if (req->flags && class->process != current->process)
{
set_error( STATUS_ACCESS_DENIED );
return;
}
if (req->extra_size > sizeof(req->extra_value) ||
req->extra_offset < -1 ||
req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
{
set_win32_error( ERROR_INVALID_INDEX );
return;
}
if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (req->extra_offset != -1)
{
memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
}
else if (req->flags & SET_CLASS_EXTRA)
{
set_win32_error( ERROR_INVALID_INDEX );
return;
}
reply->old_atom = class->atom;
reply->old_style = class->style;
reply->old_extra = class->nb_extra_bytes;
reply->old_win_extra = class->win_extra;
reply->old_instance = class->instance;
reply->base_atom = class->base_atom;
if (req->flags & SET_CLASS_ATOM)
{
if (!grab_global_atom( NULL, req->atom )) return;
release_global_atom( NULL, class->atom );
class->atom = req->atom;
}
if (req->flags & SET_CLASS_STYLE) class->style = req->style;
if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
&req->extra_value, req->extra_size );
}
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