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
  24 #include <assert.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "ntstatus.h"
  30 #define WIN32_NO_STATUS
  31
  32 #include "wine/list.h"
  33
  34 #include "request.h"
  35 #include "object.h"
  36 #include "process.h"
  37 #include "user.h"
  38 #include "winuser.h"
  39 #include "winternl.h"
  40
  41 struct window_class
  42 {
  43     struct list     entry;           /* entry in process list */
  44     struct process *process;         /* process owning the class */
  45     int             count;           /* reference count */
  46     int             local;           /* local class? */
  47     atom_t          atom;            /* class atom */
  48     atom_t          base_atom;       /* base class atom for versioned class */
  49     mod_handle_t    instance;        /* module instance */
  50     unsigned int    style;           /* class style */
  51     int             win_extra;       /* number of window extra bytes */
  52     client_ptr_t    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     release_global_atom( NULL, class->atom );
  79     release_global_atom( NULL, class->base_atom );
  80     list_remove( &class->entry );
  81     release_object( class->process );
  82     free( class );
  83 }
  84
  85 void destroy_process_classes( struct process *process )
  86 {
  87     struct list *ptr;
  88
  89     while ((ptr = list_head( &process->classes )))
  90     {
  91         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
  92         destroy_class( class );
  93     }
  94 }
  95
  96 static struct window_class *find_class( struct process *process, atom_t atom, mod_handle_t instance )
  97 {
  98     struct list *ptr;
  99
 100     LIST_FOR_EACH( ptr, &process->classes )
 101     {
 102         int is_win16;
 103         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
 104         if (class->atom != atom) continue;
 105         is_win16 = !(class->instance >> 16);
 106         if (!instance || !class->local || class->instance == instance ||
 107             (!is_win16 && ((class->instance & ~0xffff) == (instance & ~0xffff)))) return class;
 108     }
 109     return NULL;
 110 }
 111
 112 struct window_class *grab_class( struct process *process, atom_t atom,
 113                                  mod_handle_t instance, int *extra_bytes )
 114 {
 115     struct window_class *class = find_class( process, atom, instance );
 116     if (class)
 117     {
 118         class->count++;
 119         *extra_bytes = class->win_extra;
 120     }
 121     else set_error( STATUS_INVALID_HANDLE );
 122     return class;
 123 }
 124
 125 void release_class( struct window_class *class )
 126 {
 127     assert( class->count > 0 );
 128     class->count--;
 129 }
 130
 131 int is_desktop_class( struct window_class *class )
 132 {
 133     return (class->atom == DESKTOP_ATOM && !class->local);
 134 }
 135
 136 int is_hwnd_message_class( struct window_class *class )
 137 {
 138     static const WCHAR messageW[] = {'M','e','s','s','a','g','e'};
 139     static const struct unicode_str name = { messageW, sizeof(messageW) };
 140
 141     return (!class->local && class->atom == find_global_atom( NULL, &name ));
 142 }
 143
 144 int get_class_style( struct window_class *class )
 145 {
 146     return class->style;
 147 }
 148
 149 atom_t get_class_atom( struct window_class *class )
 150 {
 151     return class->base_atom;
 152 }
 153
 154 client_ptr_t get_class_client_ptr( struct window_class *class )
 155 {
 156     return class->client_ptr;
 157 }
 158
 159 /* create a window class */
 160 DECL_HANDLER(create_class)
 161 {
 162     struct window_class *class;
 163     struct unicode_str name = get_req_unicode_str();
 164     atom_t atom, base_atom;
 165
 166     if (name.len)
 167     {
 168         atom = add_global_atom( NULL, &name );
 169         if (!atom) return;
 170         if (req->name_offset && req->name_offset < name.len / sizeof(WCHAR))
 171         {
 172             name.str += req->name_offset;
 173             name.len -= req->name_offset * sizeof(WCHAR);
 174
 175             base_atom = add_global_atom( NULL, &name );
 176             if (!base_atom)
 177             {
 178                 release_global_atom( NULL, atom );
 179                 return;
 180             }
 181         }
 182         else
 183         {
 184             base_atom = atom;
 185             grab_global_atom( NULL, atom );
 186         }
 187     }
 188     else
 189     {
 190         base_atom = atom = req->atom;
 191         if (!grab_global_atom( NULL, atom )) return;
 192         grab_global_atom( NULL, base_atom );
 193     }
 194
 195     class = find_class( current->process, atom, req->instance );
 196     if (class && !class->local == !req->local)
 197     {
 198         set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
 199         release_global_atom( NULL, atom );
 200         release_global_atom( NULL, base_atom );
 201         return;
 202     }
 203     if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
 204     {
 205         /* don't allow stupid values here */
 206         set_error( STATUS_INVALID_PARAMETER );
 207         release_global_atom( NULL, atom );
 208         release_global_atom( NULL, base_atom );
 209         return;
 210     }
 211
 212     if (!(class = create_class( current->process, req->extra, req->local )))
 213     {
 214         release_global_atom( NULL, atom );
 215         release_global_atom( NULL, base_atom );
 216         return;
 217     }
 218     class->atom       = atom;
 219     class->base_atom  = base_atom;
 220     class->instance   = req->instance;
 221     class->style      = req->style;
 222     class->win_extra  = req->win_extra;
 223     class->client_ptr = req->client_ptr;
 224     reply->atom = atom;
 225 }
 226
 227 /* destroy a window class */
 228 DECL_HANDLER(destroy_class)
 229 {
 230     struct window_class *class;
 231     struct unicode_str name = get_req_unicode_str();
 232     atom_t atom = req->atom;
 233
 234     if (name.len) atom = find_global_atom( NULL, &name );
 235
 236     if (!(class = find_class( current->process, atom, req->instance )))
 237         set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
 238     else if (class->count)
 239         set_win32_error( ERROR_CLASS_HAS_WINDOWS );
 240     else
 241     {
 242         reply->client_ptr = class->client_ptr;
 243         destroy_class( class );
 244     }
 245 }
 246
 247
 248 /* set some information in a class */
 249 DECL_HANDLER(set_class_info)
 250 {
 251     struct window_class *class = get_window_class( req->window );
 252
 253     if (!class) return;
 254
 255     if (req->flags && class->process != current->process)
 256     {
 257         set_error( STATUS_ACCESS_DENIED );
 258         return;
 259     }
 260
 261     if (req->extra_size > sizeof(req->extra_value) ||
 262         req->extra_offset < -1 ||
 263         req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
 264     {
 265         set_win32_error( ERROR_INVALID_INDEX );
 266         return;
 267     }
 268     if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
 269     {
 270         set_error( STATUS_INVALID_PARAMETER );
 271         return;
 272     }
 273     if (req->extra_offset != -1)
 274     {
 275         memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
 276     }
 277     else if (req->flags & SET_CLASS_EXTRA)
 278     {
 279         set_win32_error( ERROR_INVALID_INDEX );
 280         return;
 281     }
 282
 283     reply->old_atom      = class->atom;
 284     reply->old_style     = class->style;
 285     reply->old_extra     = class->nb_extra_bytes;
 286     reply->old_win_extra = class->win_extra;
 287     reply->old_instance  = class->instance;
 288     reply->base_atom     = class->base_atom;
 289
 290     if (req->flags & SET_CLASS_ATOM)
 291     {
 292         if (!grab_global_atom( NULL, req->atom )) return;
 293         release_global_atom( NULL, class->atom );
 294         class->atom = req->atom;
 295     }
 296     if (req->flags & SET_CLASS_STYLE) class->style = req->style;
 297     if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
 298     if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
 299     if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
 300                                               &req->extra_value, req->extra_size );
 301 }