server/class.c

   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     atom_t          base_atom;       /* base class atom for versioned class */
  50     mod_handle_t    instance;        /* module instance */
  51     unsigned int    style;           /* class style */
  52     int             win_extra;       /* number of window extra bytes */
  53     client_ptr_t    client_ptr;      /* pointer to class in client address space */
  54     int             nb_extra_bytes;  /* number of extra bytes */
  55     char            extra_bytes[1];  /* extra bytes storage */
  56 };
  57
  58 static struct window_class *create_class( struct process *process, int extra_bytes, int local )
  59 {
  60     struct window_class *class;
  61
  62     if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
  63
  64     class->process = (struct process *)grab_object( process );
  65     class->count = 0;
  66     class->local = local;
  67     class->nb_extra_bytes = extra_bytes;
  68     memset( class->extra_bytes, 0, extra_bytes );
  69     /* other fields are initialized by caller */
  70
  71     /* local classes have priority so we put them first in the list */
  72     if (local) list_add_head( &process->classes, &class->entry );
  73     else list_add_tail( &process->classes, &class->entry );
  74     return class;
  75 }
  76
  77 static void destroy_class( struct window_class *class )
  78 {
  79     release_global_atom( NULL, class->atom );
  80     release_global_atom( NULL, class->base_atom );
  81     list_remove( &class->entry );
  82     release_object( class->process );
  83     free( class );
  84 }
  85
  86 void destroy_process_classes( struct process *process )
  87 {
  88     struct list *ptr;
  89
  90     while ((ptr = list_head( &process->classes )))
  91     {
  92         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
  93         destroy_class( class );
  94     }
  95 }
  96
  97 static struct window_class *find_class( struct process *process, atom_t atom, mod_handle_t instance )
  98 {
  99     struct list *ptr;
 100
 101     LIST_FOR_EACH( ptr, &process->classes )
 102     {
 103         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
 104         if (class->atom != atom) continue;
 105         if (!instance || !class->local || class->instance == instance) return class;
 106     }
 107     return NULL;
 108 }
 109
 110 struct window_class *grab_class( struct process *process, atom_t atom,
 111                                  mod_handle_t instance, int *extra_bytes )
 112 {
 113     struct window_class *class = find_class( process, atom, instance );
 114     if (class)
 115     {
 116         class->count++;
 117         *extra_bytes = class->win_extra;
 118     }
 119     else set_error( STATUS_INVALID_HANDLE );
 120     return class;
 121 }
 122
 123 void release_class( struct window_class *class )
 124 {
 125     assert( class->count > 0 );
 126     class->count--;
 127 }
 128
 129 int is_desktop_class( struct window_class *class )
 130 {
 131     return (class->atom == DESKTOP_ATOM && !class->local);
 132 }
 133
 134 int is_hwnd_message_class( struct window_class *class )
 135 {
 136     static const WCHAR messageW[] = {'M','e','s','s','a','g','e'};
 137     static const struct unicode_str name = { messageW, sizeof(messageW) };
 138
 139     return (!class->local && class->atom == find_global_atom( NULL, &name ));
 140 }
 141
 142 atom_t get_class_atom( struct window_class *class )
 143 {
 144     return class->base_atom;
 145 }
 146
 147 client_ptr_t get_class_client_ptr( struct window_class *class )
 148 {
 149     return class->client_ptr;
 150 }
 151
 152 /* create a window class */
 153 DECL_HANDLER(create_class)
 154 {
 155     struct window_class *class;
 156     struct unicode_str name = get_req_unicode_str();
 157     atom_t atom, base_atom;
 158
 159     if (name.len)
 160     {
 161         atom = add_global_atom( NULL, &name );
 162         if (!atom) return;
 163         if (req->name_offset && req->name_offset < name.len / sizeof(WCHAR))
 164         {
 165             name.str += req->name_offset;
 166             name.len -= req->name_offset * sizeof(WCHAR);
 167
 168             base_atom = add_global_atom( NULL, &name );
 169             if (!base_atom)
 170             {
 171                 release_global_atom( NULL, atom );
 172                 return;
 173             }
 174         }
 175         else
 176         {
 177             base_atom = atom;
 178             grab_global_atom( NULL, atom );
 179         }
 180     }
 181     else
 182     {
 183         base_atom = atom = req->atom;
 184         if (!grab_global_atom( NULL, atom )) return;
 185         grab_global_atom( NULL, base_atom );
 186     }
 187
 188     class = find_class( current->process, atom, req->instance );
 189     if (class && !class->local == !req->local)
 190     {
 191         set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
 192         release_global_atom( NULL, atom );
 193         release_global_atom( NULL, base_atom );
 194         return;
 195     }
 196     if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
 197     {
 198         /* don't allow stupid values here */
 199         set_error( STATUS_INVALID_PARAMETER );
 200         release_global_atom( NULL, atom );
 201         release_global_atom( NULL, base_atom );
 202         return;
 203     }
 204
 205     if (!(class = create_class( current->process, req->extra, req->local )))
 206     {
 207         release_global_atom( NULL, atom );
 208         release_global_atom( NULL, base_atom );
 209         return;
 210     }
 211     class->atom       = atom;
 212     class->base_atom  = base_atom;
 213     class->instance   = req->instance;
 214     class->style      = req->style;
 215     class->win_extra  = req->win_extra;
 216     class->client_ptr = req->client_ptr;
 217     reply->atom = atom;
 218 }
 219
 220 /* destroy a window class */
 221 DECL_HANDLER(destroy_class)
 222 {
 223     struct window_class *class;
 224     struct unicode_str name = get_req_unicode_str();
 225     atom_t atom = req->atom;
 226
 227     if (name.len) atom = find_global_atom( NULL, &name );
 228
 229     if (!(class = find_class( current->process, atom, req->instance )))
 230         set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
 231     else if (class->count)
 232         set_win32_error( ERROR_CLASS_HAS_WINDOWS );
 233     else
 234     {
 235         reply->client_ptr = class->client_ptr;
 236         destroy_class( class );
 237     }
 238 }
 239
 240
 241 /* set some information in a class */
 242 DECL_HANDLER(set_class_info)
 243 {
 244     struct window_class *class = get_window_class( req->window );
 245
 246     if (!class) return;
 247
 248     if (req->flags && class->process != current->process)
 249     {
 250         set_error( STATUS_ACCESS_DENIED );
 251         return;
 252     }
 253
 254     if (req->extra_size > sizeof(req->extra_value) ||
 255         req->extra_offset < -1 ||
 256         req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
 257     {
 258         set_win32_error( ERROR_INVALID_INDEX );
 259         return;
 260     }
 261     if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
 262     {
 263         set_error( STATUS_INVALID_PARAMETER );
 264         return;
 265     }
 266     if (req->extra_offset != -1)
 267     {
 268         memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
 269     }
 270     else if (req->flags & SET_CLASS_EXTRA)
 271     {
 272         set_win32_error( ERROR_INVALID_INDEX );
 273         return;
 274     }
 275
 276     reply->old_atom      = class->atom;
 277     reply->old_style     = class->style;
 278     reply->old_extra     = class->nb_extra_bytes;
 279     reply->old_win_extra = class->win_extra;
 280     reply->old_instance  = class->instance;
 281     reply->base_atom     = class->base_atom;
 282
 283     if (req->flags & SET_CLASS_ATOM)
 284     {
 285         if (!grab_global_atom( NULL, req->atom )) return;
 286         release_global_atom( NULL, class->atom );
 287         class->atom = req->atom;
 288     }
 289     if (req->flags & SET_CLASS_STYLE) class->style = req->style;
 290     if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
 291     if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
 292     if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
 293                                               &req->extra_value, req->extra_size );
 294 }