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