1 /*
2 * Server-side window class management
3 *
4 * Copyright (C) 2002 Mike McCormack
5 * Copyright (C) 2003 Alexandre Julliard
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 */
21
22 #include "config.h"
23 #include "wine/port.h"
24
25 #include <assert.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <string.h>
29
30 #include "ntstatus.h"
31 #define WIN32_NO_STATUS
32
33 #include "wine/list.h"
34
35 #include "request.h"
36 #include "object.h"
37 #include "process.h"
38 #include "user.h"
39 #include "winuser.h"
40 #include "winternl.h"
41
42 struct window_class
43 {
44 struct list entry; /* entry in process list */
45 struct process *process; /* process owning the class */
46 int count; /* reference count */
47 int local; /* local class? */
48 atom_t atom; /* class atom */
49 void *instance; /* module instance */
50 unsigned int style; /* class style */
51 int win_extra; /* number of window extra bytes */
52 void *client_ptr; /* pointer to class in client address space */
53 int nb_extra_bytes; /* number of extra bytes */
54 char extra_bytes[1]; /* extra bytes storage */
55 };
56
57 static struct window_class *create_class( struct process *process, int extra_bytes, int local )
58 {
59 struct window_class *class;
60
61 if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
62
63 class->process = (struct process *)grab_object( process );
64 class->count = 0;
65 class->local = local;
66 class->nb_extra_bytes = extra_bytes;
67 memset( class->extra_bytes, 0, extra_bytes );
68 /* other fields are initialized by caller */
69
70 /* local classes have priority so we put them first in the list */
71 if (local) list_add_head( &process->classes, &class->entry );
72 else list_add_tail( &process->classes, &class->entry );
73 return class;
74 }
75
76 static void destroy_class( struct window_class *class )
77 {
78 list_remove( &class->entry );
79 release_object( class->process );
80 free( class );
81 }
82
83 void destroy_process_classes( struct process *process )
84 {
85 struct list *ptr;
86
87 while ((ptr = list_head( &process->classes )))
88 {
89 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
90 destroy_class( class );
91 }
92 }
93
94 static struct window_class *find_class( struct process *process, atom_t atom, void *instance )
95 {
96 struct list *ptr;
97
98 LIST_FOR_EACH( ptr, &process->classes )
99 {
100 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
101 if (class->atom != atom) continue;
102 if (!instance || !class->local || class->instance == instance) return class;
103 }
104 return NULL;
105 }
106
107 struct window_class *grab_class( struct process *process, atom_t atom,
108 void *instance, int *extra_bytes )
109 {
110 struct window_class *class = find_class( process, atom, instance );
111 if (class)
112 {
113 class->count++;
114 *extra_bytes = class->win_extra;
115 }
116 else set_error( STATUS_INVALID_HANDLE );
117 return class;
118 }
119
120 void release_class( struct window_class *class )
121 {
122 assert( class->count > 0 );
123 class->count--;
124 }
125
126 int is_desktop_class( struct window_class *class )
127 {
128 return (class->atom == DESKTOP_ATOM && !class->local);
129 }
130
131 int is_hwnd_message_class( struct window_class *class )
132 {
133 static const WCHAR messageW[] = {'M','e','s','s','a','g','e'};
134 static const struct unicode_str name = { messageW, sizeof(messageW) };
135
136 return (!class->local && class->atom == find_global_atom( NULL, &name ));
137 }
138
139 atom_t get_class_atom( struct window_class *class )
140 {
141 return class->atom;
142 }
143
144 void *get_class_client_ptr( struct window_class *class )
145 {
146 return class->client_ptr;
147 }
148
149 /* create a window class */
150 DECL_HANDLER(create_class)
151 {
152 struct window_class *class;
153 struct unicode_str name;
154 atom_t atom;
155
156 get_req_unicode_str( &name );
157 if (name.len)
158 {
159 atom = add_global_atom( NULL, &name );
160 if (!atom) return;
161 }
162 else
163 {
164 atom = req->atom;
165 if (!grab_global_atom( NULL, atom )) return;
166 }
167
168 class = find_class( current->process, atom, req->instance );
169 if (class && !class->local == !req->local)
170 {
171 set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
172 release_global_atom( NULL, atom );
173 return;
174 }
175 if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
176 {
177 /* don't allow stupid values here */
178 set_error( STATUS_INVALID_PARAMETER );
179 release_global_atom( NULL, atom );
180 return;
181 }
182
183 if (!(class = create_class( current->process, req->extra, req->local )))
184 {
185 release_global_atom( NULL, atom );
186 return;
187 }
188 class->atom = atom;
189 class->instance = req->instance;
190 class->style = req->style;
191 class->win_extra = req->win_extra;
192 class->client_ptr = req->client_ptr;
193 reply->atom = atom;
194 }
195
196 /* destroy a window class */
197 DECL_HANDLER(destroy_class)
198 {
199 struct window_class *class;
200 struct unicode_str name;
201 atom_t atom = req->atom;
202
203 get_req_unicode_str( &name );
204 if (name.len) atom = find_global_atom( NULL, &name );
205
206 if (!(class = find_class( current->process, atom, req->instance )))
207 set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
208 else if (class->count)
209 set_win32_error( ERROR_CLASS_HAS_WINDOWS );
210 else
211 {
212 reply->client_ptr = class->client_ptr;
213 destroy_class( class );
214 }
215 }
216
217
218 /* set some information in a class */
219 DECL_HANDLER(set_class_info)
220 {
221 struct window_class *class = get_window_class( req->window );
222
223 if (!class) return;
224
225 if (req->flags && class->process != current->process)
226 {
227 set_error( STATUS_ACCESS_DENIED );
228 return;
229 }
230
231 if (req->extra_size > sizeof(req->extra_value) ||
232 req->extra_offset < -1 ||
233 req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
234 {
235 set_win32_error( ERROR_INVALID_INDEX );
236 return;
237 }
238 if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
239 {
240 set_error( STATUS_INVALID_PARAMETER );
241 return;
242 }
243 if (req->extra_offset != -1)
244 {
245 memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
246 }
247 else if (req->flags & SET_CLASS_EXTRA)
248 {
249 set_win32_error( ERROR_INVALID_INDEX );
250 return;
251 }
252
253 reply->old_atom = class->atom;
254 reply->old_style = class->style;
255 reply->old_extra = class->nb_extra_bytes;
256 reply->old_win_extra = class->win_extra;
257 reply->old_instance = class->instance;
258
259 if (req->flags & SET_CLASS_ATOM)
260 {
261 if (!grab_global_atom( NULL, req->atom )) return;
262 release_global_atom( NULL, class->atom );
263 class->atom = req->atom;
264 }
265 if (req->flags & SET_CLASS_STYLE) class->style = req->style;
266 if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
267 if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
268 if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
269 &req->extra_value, req->extra_size );
270 }
271
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