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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 "wine/list.h"
  31
  32 #include "request.h"
  33 #include "object.h"
  34 #include "process.h"
  35 #include "user.h"
  36 #include "winuser.h"
  37
  38 struct window_class
  39 {
  40     struct list     entry;           /* entry in process list */
  41     struct process *process;         /* process owning the class */
  42     int             count;           /* reference count */
  43     int             local;           /* local class? */
  44     atom_t          atom;            /* class atom */
  45     void           *instance;        /* module instance */
  46     unsigned int    style;           /* class style */
  47     int             win_extra;       /* number of window extra bytes */
  48     void           *client_ptr;      /* pointer to class in client address space */
  49     int             nb_extra_bytes;  /* number of extra bytes */
  50     char            extra_bytes[1];  /* extra bytes storage */
  51 };
  52
  53 static struct window_class *desktop_class;
  54
  55 static struct window_class *create_class( struct process *process, int extra_bytes, int local )
  56 {
  57     struct window_class *class;
  58
  59     if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
  60
  61     class->process = (struct process *)grab_object( process );
  62     class->count = 0;
  63     class->local = local;
  64     class->nb_extra_bytes = extra_bytes;
  65     memset( class->extra_bytes, 0, extra_bytes );
  66     /* other fields are initialized by caller */
  67
  68     /* local classes have priority so we put them first in the list */
  69     if (local) list_add_head( &process->classes, &class->entry );
  70     else list_add_tail( &process->classes, &class->entry );
  71     return class;
  72 }
  73
  74 static struct window_class *get_desktop_class(void)
  75 {
  76     if (!desktop_class)
  77     {
  78         if (!(desktop_class = mem_alloc( sizeof(*desktop_class) - 1 ))) return NULL;
  79         desktop_class->process        = NULL;
  80         desktop_class->count          = 0;
  81         desktop_class->local          = 0;
  82         desktop_class->nb_extra_bytes = 0;
  83         desktop_class->atom           = DESKTOP_ATOM;
  84         desktop_class->instance       = NULL;
  85         desktop_class->style          = CS_DBLCLKS;
  86         desktop_class->win_extra      = 0;
  87         desktop_class->client_ptr     = NULL;
  88     }
  89     return desktop_class;
  90 }
  91
  92 static void destroy_class( struct window_class *class )
  93 {
  94     list_remove( &class->entry );
  95     release_object( class->process );
  96     free( class );
  97 }
  98
  99 void destroy_process_classes( struct process *process )
 100 {
 101     struct list *ptr;
 102
 103     while ((ptr = list_head( &process->classes )))
 104     {
 105         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
 106         destroy_class( class );
 107     }
 108 }
 109
 110 static struct window_class *find_class( struct process *process, atom_t atom, void *instance )
 111 {
 112     struct list *ptr;
 113
 114     LIST_FOR_EACH( ptr, &process->classes )
 115     {
 116         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
 117         if (class->atom != atom) continue;
 118         if (!instance || !class->local || class->instance == instance) return class;
 119     }
 120     if (atom == DESKTOP_ATOM) return get_desktop_class();
 121     return NULL;
 122 }
 123
 124 struct window_class *grab_class( struct process *process, atom_t atom,
 125                                  void *instance, int *extra_bytes )
 126 {
 127     struct window_class *class = find_class( process, atom, instance );
 128     if (class)
 129     {
 130         class->count++;
 131         *extra_bytes = class->win_extra;
 132     }
 133     else set_error( STATUS_INVALID_HANDLE );
 134     return class;
 135 }
 136
 137 void release_class( struct window_class *class )
 138 {
 139     assert( class->count > 0 );
 140     class->count--;
 141 }
 142
 143 atom_t get_class_atom( struct window_class *class )
 144 {
 145     return class->atom;
 146 }
 147
 148 void *get_class_client_ptr( struct window_class *class )
 149 {
 150     return class->client_ptr;
 151 }
 152
 153 /* create a window class */
 154 DECL_HANDLER(create_class)
 155 {
 156     struct window_class *class;
 157     struct winstation *winstation;
 158
 159     if (!req->local && req->atom == DESKTOP_ATOM)
 160         return;  /* silently ignore attempts to create the desktop class */
 161
 162     class = find_class( current->process, req->atom, req->instance );
 163     if (class && !class->local == !req->local)
 164     {
 165         set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
 166         return;
 167     }
 168     if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
 169     {
 170         /* don't allow stupid values here */
 171         set_error( STATUS_INVALID_PARAMETER );
 172         return;
 173     }
 174
 175     if (!(winstation = get_process_winstation( current->process, WINSTA_ACCESSGLOBALATOMS )))
 176         return;
 177
 178     if (!grab_global_atom( winstation, req->atom ))
 179     {
 180         release_object( winstation );
 181         return;
 182     }
 183     if (!(class = create_class( current->process, req->extra, req->local )))
 184     {
 185         release_global_atom( winstation, req->atom );
 186         release_object( winstation );
 187         return;
 188     }
 189     class->atom       = req->atom;
 190     class->instance   = req->instance;
 191     class->style      = req->style;
 192     class->win_extra  = req->win_extra;
 193     class->client_ptr = req->client_ptr;
 194     release_object( winstation );
 195 }
 196
 197 /* destroy a window class */
 198 DECL_HANDLER(destroy_class)
 199 {
 200     struct window_class *class = find_class( current->process, req->atom, req->instance );
 201
 202     if (!class)
 203         set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
 204     else if (class->count)
 205         set_win32_error( ERROR_CLASS_HAS_WINDOWS );
 206     else
 207     {
 208         reply->client_ptr = class->client_ptr;
 209         if (class != desktop_class) destroy_class( class );
 210     }
 211 }
 212
 213
 214 /* set some information in a class */
 215 DECL_HANDLER(set_class_info)
 216 {
 217     struct window_class *class = get_window_class( req->window );
 218
 219     if (!class) return;
 220
 221     if (req->flags && class->process != current->process)
 222     {
 223         set_error( STATUS_ACCESS_DENIED );
 224         return;
 225     }
 226
 227     if (req->extra_size > sizeof(req->extra_value) ||
 228         req->extra_offset < -1 ||
 229         req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
 230     {
 231         set_win32_error( ERROR_INVALID_INDEX );
 232         return;
 233     }
 234     if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
 235     {
 236         set_error( STATUS_INVALID_PARAMETER );
 237         return;
 238     }
 239     if (req->extra_offset != -1)
 240     {
 241         memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
 242     }
 243     else if (req->flags & SET_CLASS_EXTRA)
 244     {
 245         set_win32_error( ERROR_INVALID_INDEX );
 246         return;
 247     }
 248
 249     reply->old_atom      = class->atom;
 250     reply->old_style     = class->style;
 251     reply->old_extra     = class->nb_extra_bytes;
 252     reply->old_win_extra = class->win_extra;
 253     reply->old_instance  = class->instance;
 254
 255     if (req->flags & SET_CLASS_ATOM)
 256     {
 257         struct winstation *winstation = get_process_winstation( current->process,
 258                                                                 WINSTA_ACCESSGLOBALATOMS );
 259         if (!grab_global_atom( winstation, req->atom ))
 260         {
 261             release_object( winstation );
 262             return;
 263         }
 264         release_global_atom( winstation, class->atom );
 265         class->atom = req->atom;
 266         release_object( winstation );
 267     }
 268     if (req->flags & SET_CLASS_STYLE) class->style = req->style;
 269     if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
 270     if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
 271     if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
 272                                               &req->extra_value, req->extra_size );
 273 }