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 #define DESKTOP_ATOM  ((atom_t)32769)
  54
  55 static struct window_class *desktop_class;
  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 struct window_class *create_desktop_class( unsigned int style, int win_extra )
  77 {
  78     struct window_class *class;
  79
  80     if (!(class = mem_alloc( sizeof(*class) - 1 ))) return NULL;
  81
  82     class->process        = NULL;
  83     class->count          = 0;
  84     class->local          = 0;
  85     class->nb_extra_bytes = 0;
  86     class->atom           = DESKTOP_ATOM;
  87     class->instance       = NULL;
  88     class->style          = style;
  89     class->win_extra      = win_extra;
  90     class->client_ptr     = NULL;
  91     desktop_class = class;
  92     return class;
  93 }
  94
  95 static void destroy_class( struct window_class *class )
  96 {
  97     list_remove( &class->entry );
  98     release_object( class->process );
  99     free( class );
 100 }
 101
 102 void destroy_process_classes( struct process *process )
 103 {
 104     struct list *ptr;
 105
 106     while ((ptr = list_head( &process->classes )))
 107     {
 108         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
 109         destroy_class( class );
 110     }
 111 }
 112
 113 static struct window_class *find_class( struct process *process, atom_t atom, void *instance )
 114 {
 115     struct list *ptr;
 116
 117     LIST_FOR_EACH( ptr, &process->classes )
 118     {
 119         struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
 120         if (class->atom != atom) continue;
 121         if (!instance || !class->local || class->instance == instance) return class;
 122     }
 123     if (atom == DESKTOP_ATOM) return desktop_class;
 124     return NULL;
 125 }
 126
 127 struct window_class *grab_class( struct process *process, atom_t atom,
 128                                  void *instance, int *extra_bytes )
 129 {
 130     struct window_class *class = find_class( process, atom, instance );
 131     if (class)
 132     {
 133         class->count++;
 134         *extra_bytes = class->win_extra;
 135     }
 136     else set_error( STATUS_INVALID_HANDLE );
 137     return class;
 138 }
 139
 140 void release_class( struct window_class *class )
 141 {
 142     assert( class->count > 0 );
 143     class->count--;
 144 }
 145
 146 atom_t get_class_atom( struct window_class *class )
 147 {
 148     return class->atom;
 149 }
 150
 151 void *get_class_client_ptr( struct window_class *class )
 152 {
 153     return class->client_ptr;
 154 }
 155
 156 /* create a window class */
 157 DECL_HANDLER(create_class)
 158 {
 159     struct window_class *class;
 160     struct winstation *winstation;
 161
 162     if (!req->local && req->atom == DESKTOP_ATOM)
 163     {
 164         if (!desktop_class) create_desktop_class( req->style, req->win_extra );
 165         return;  /* silently ignore further attempts to create the desktop class */
 166     }
 167
 168     class = find_class( current->process, req->atom, req->instance );
 169     if (class && !class->local == !req->local)
 170     {
 171         set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
 172         return;
 173     }
 174     if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
 175     {
 176         /* don't allow stupid values here */
 177         set_error( STATUS_INVALID_PARAMETER );
 178         return;
 179     }
 180
 181     if (!(winstation = get_process_winstation( current->process, WINSTA_ACCESSGLOBALATOMS )))
 182         return;
 183
 184     if (!grab_global_atom( winstation, req->atom ))
 185     {
 186         release_object( winstation );
 187         return;
 188     }
 189     if (!(class = create_class( current->process, req->extra, req->local )))
 190     {
 191         release_global_atom( winstation, req->atom );
 192         release_object( winstation );
 193         return;
 194     }
 195     class->atom       = req->atom;
 196     class->instance   = req->instance;
 197     class->style      = req->style;
 198     class->win_extra  = req->win_extra;
 199     class->client_ptr = req->client_ptr;
 200     release_object( winstation );
 201 }
 202
 203 /* destroy a window class */
 204 DECL_HANDLER(destroy_class)
 205 {
 206     struct window_class *class = find_class( current->process, req->atom, req->instance );
 207
 208     if (!class)
 209         set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
 210     else if (class->count)
 211         set_win32_error( ERROR_CLASS_HAS_WINDOWS );
 212     else
 213     {
 214         reply->client_ptr = class->client_ptr;
 215         if (class != desktop_class) destroy_class( class );
 216     }
 217 }
 218
 219
 220 /* set some information in a class */
 221 DECL_HANDLER(set_class_info)
 222 {
 223     struct window_class *class = get_window_class( req->window );
 224
 225     if (!class) return;
 226
 227     if (req->flags && class->process != current->process)
 228     {
 229         set_error( STATUS_ACCESS_DENIED );
 230         return;
 231     }
 232
 233     if (req->extra_size > sizeof(req->extra_value) ||
 234         req->extra_offset < -1 ||
 235         req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
 236     {
 237         set_win32_error( ERROR_INVALID_INDEX );
 238         return;
 239     }
 240     if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
 241     {
 242         set_error( STATUS_INVALID_PARAMETER );
 243         return;
 244     }
 245     if (req->extra_offset != -1)
 246     {
 247         memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
 248     }
 249     else if (req->flags & SET_CLASS_EXTRA)
 250     {
 251         set_win32_error( ERROR_INVALID_INDEX );
 252         return;
 253     }
 254
 255     reply->old_atom      = class->atom;
 256     reply->old_style     = class->style;
 257     reply->old_extra     = class->nb_extra_bytes;
 258     reply->old_win_extra = class->win_extra;
 259     reply->old_instance  = class->instance;
 260
 261     if (req->flags & SET_CLASS_ATOM)
 262     {
 263         struct winstation *winstation = get_process_winstation( current->process,
 264                                                                 WINSTA_ACCESSGLOBALATOMS );
 265         if (!grab_global_atom( winstation, req->atom ))
 266         {
 267             release_object( winstation );
 268             return;
 269         }
 270         release_global_atom( winstation, class->atom );
 271         class->atom = req->atom;
 272         release_object( winstation );
 273     }
 274     if (req->flags & SET_CLASS_STYLE) class->style = req->style;
 275     if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
 276     if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
 277     if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
 278                                               &req->extra_value, req->extra_size );
 279 }