2 * Server-side atom management
4 * Copyright (C) 1999, 2000 Alexandre Julliard
5 * Copyright (C) 2000 Turchanov Sergei
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.
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.
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
23 #include "wine/port.h"
31 #define WIN32_NO_STATUS
43 #define MIN_HASH_SIZE 4
44 #define MAX_HASH_SIZE 0x200
46 #define MAX_ATOM_LEN 255
47 #define MIN_STR_ATOM 0xc000
48 #define MAX_ATOMS 0x4000
52 struct atom_entry *next; /* hash table list */
53 struct atom_entry *prev; /* hash table list */
54 int count; /* reference count */
55 short pinned; /* whether the atom is pinned or not */
56 atom_t atom; /* atom handle */
57 unsigned short hash; /* string hash */
58 unsigned short len; /* string len */
59 WCHAR str[1]; /* atom string */
64 struct object obj; /* object header */
65 int count; /* count of atom handles */
66 int last; /* last handle in-use */
67 struct atom_entry **handles; /* atom handles */
68 int entries_count; /* humber of hash entries */
69 struct atom_entry **entries; /* hash table entries */
72 static void atom_table_dump( struct object *obj, int verbose );
73 static void atom_table_destroy( struct object *obj );
75 static const struct object_ops atom_table_ops =
77 sizeof(struct atom_table), /* size */
78 atom_table_dump, /* dump */
79 no_add_queue, /* add_queue */
80 NULL, /* remove_queue */
83 no_signal, /* signal */
84 no_get_fd, /* get_fd */
85 no_map_access, /* map_access */
86 no_lookup_name, /* lookup_name */
87 no_close_handle, /* close_handle */
88 atom_table_destroy /* destroy */
92 /* create an atom table */
93 static struct atom_table *create_table(int entries_count)
95 struct atom_table *table;
97 if ((table = alloc_object( &atom_table_ops )))
99 if ((entries_count < MIN_HASH_SIZE) ||
100 (entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
101 table->entries_count = entries_count;
102 if (!(table->entries = malloc( sizeof(*table->entries) * table->entries_count )))
104 set_error( STATUS_NO_MEMORY );
107 memset( table->entries, 0, sizeof(*table->entries) * table->entries_count );
110 if ((table->handles = mem_alloc( sizeof(*table->handles) * table->count )))
113 release_object( table );
119 /* retrieve an entry pointer from its atom */
120 static struct atom_entry *get_atom_entry( struct atom_table *table, atom_t atom )
122 struct atom_entry *entry = NULL;
123 if (table && (atom >= MIN_STR_ATOM) && (atom <= MIN_STR_ATOM + table->last))
124 entry = table->handles[atom - MIN_STR_ATOM];
125 if (!entry) set_error( STATUS_INVALID_HANDLE );
129 /* add an atom entry in the table and return its handle */
130 static atom_t add_atom_entry( struct atom_table *table, struct atom_entry *entry )
133 for (i = 0; i <= table->last; i++)
134 if (!table->handles[i]) goto found;
135 if (i == table->count)
137 struct atom_entry **new_table = NULL;
138 int new_size = table->count + table->count / 2;
139 if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
140 if (new_size > table->count)
141 new_table = realloc( table->handles, sizeof(*table->handles) * new_size );
144 set_error( STATUS_NO_MEMORY );
147 table->count = new_size;
148 table->handles = new_table;
152 table->handles[i] = entry;
153 entry->atom = i + MIN_STR_ATOM;
157 /* compute the hash code for a string */
158 static unsigned short atom_hash( struct atom_table *table, const WCHAR *str, size_t len )
161 unsigned short hash = 0;
162 for (i = 0; i < len; i++) hash ^= toupperW(str[i]) + i;
163 return hash % table->entries_count;
166 /* dump an atom table */
167 static void atom_table_dump( struct object *obj, int verbose )
170 struct atom_table *table = (struct atom_table *)obj;
171 assert( obj->ops == &atom_table_ops );
173 fprintf( stderr, "Atom table size=%d entries=%d\n",
174 table->last + 1, table->entries_count );
175 if (!verbose) return;
176 for (i = 0; i <= table->last; i++)
178 struct atom_entry *entry = table->handles[i];
179 if (!entry) continue;
180 fprintf( stderr, " %04x: ref=%d pinned=%c hash=%d \"",
181 entry->atom, entry->count, entry->pinned ? 'Y' : 'N', entry->hash );
182 dump_strW( entry->str, entry->len, stderr, "\"\"");
183 fprintf( stderr, "\"\n" );
187 /* destroy the atom table */
188 static void atom_table_destroy( struct object *obj )
191 struct atom_table *table = (struct atom_table *)obj;
192 assert( obj->ops == &atom_table_ops );
195 for (i = 0; i <= table->last; i++) free( table->handles[i] );
196 free( table->handles );
198 if (table->entries) free( table->entries );
201 /* find an atom entry in its hash list */
202 static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str,
203 size_t len, unsigned short hash )
205 struct atom_entry *entry = table->entries[hash];
208 if (entry->len == len && !memicmpW( entry->str, str, len )) break;
214 /* add an atom to the table */
215 static atom_t add_atom( struct atom_table *table, const WCHAR *str, size_t len )
217 struct atom_entry *entry;
218 unsigned short hash = atom_hash( table, str, len );
223 set_error( STATUS_OBJECT_NAME_INVALID );
226 if (len > MAX_ATOM_LEN)
228 set_error( STATUS_INVALID_PARAMETER );
231 if ((entry = find_atom_entry( table, str, len, hash ))) /* exists already */
237 if ((entry = mem_alloc( sizeof(*entry) + (len - 1) * sizeof(WCHAR) )))
239 if ((atom = add_atom_entry( table, entry )))
242 if ((entry->next = table->entries[hash])) entry->next->prev = entry;
243 table->entries[hash] = entry;
248 memcpy( entry->str, str, len * sizeof(WCHAR) );
252 else set_error( STATUS_NO_MEMORY );
256 /* delete an atom from the table */
257 static void delete_atom( struct atom_table *table, atom_t atom, int if_pinned )
259 struct atom_entry *entry = get_atom_entry( table, atom );
261 if (entry->pinned && !if_pinned) set_error( STATUS_WAS_LOCKED );
262 else if (!--entry->count)
264 if (entry->next) entry->next->prev = entry->prev;
265 if (entry->prev) entry->prev->next = entry->next;
266 else table->entries[entry->hash] = entry->next;
267 table->handles[atom - MIN_STR_ATOM] = NULL;
272 /* find an atom in the table */
273 static atom_t find_atom( struct atom_table *table, const WCHAR *str, size_t len )
275 struct atom_entry *entry;
279 set_error( STATUS_OBJECT_NAME_INVALID );
282 if (len > MAX_ATOM_LEN)
284 set_error( STATUS_INVALID_PARAMETER );
287 if (table && (entry = find_atom_entry( table, str, len, atom_hash(table, str, len) )))
289 set_error( STATUS_OBJECT_NAME_NOT_FOUND );
293 static struct atom_table *get_global_table( struct winstation *winstation, int create )
295 if (!winstation->atom_table)
297 if (create) winstation->atom_table = create_table( HASH_SIZE );
298 else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
300 return winstation->atom_table;
303 static struct atom_table *get_table( obj_handle_t h, int create )
305 struct atom_table *table = NULL;
309 table = (struct atom_table *)get_handle_obj( current->process, h, 0, &atom_table_ops );
313 struct winstation *winstation = get_process_winstation( current->process,
314 WINSTA_ACCESSGLOBALATOMS );
317 table = get_global_table( winstation, 1 );
318 if (table) grab_object( table );
319 release_object( winstation );
325 /* add an atom in the global table; used for window properties */
326 atom_t add_global_atom( struct winstation *winstation, const WCHAR *str, size_t len )
328 struct atom_table *global_table = get_global_table( winstation, 1 );
329 if (!global_table) return 0;
330 return add_atom( global_table, str, len );
333 /* find an atom in the global table; used for window properties */
334 atom_t find_global_atom( struct winstation *winstation, const WCHAR *str, size_t len )
336 struct atom_table *global_table = get_global_table( winstation, 0 );
337 struct atom_entry *entry;
339 if (!len || len > MAX_ATOM_LEN || !global_table) return 0;
340 if ((entry = find_atom_entry( global_table, str, len, atom_hash(global_table, str, len) )))
345 /* increment the ref count of a global atom; used for window properties */
346 int grab_global_atom( struct winstation *winstation, atom_t atom )
348 if (atom >= MIN_STR_ATOM)
350 struct atom_table *global_table = get_global_table( winstation, 0 );
353 struct atom_entry *entry = get_atom_entry( global_table, atom );
354 if (entry) entry->count++;
355 return (entry != NULL);
362 /* decrement the ref count of a global atom; used for window properties */
363 void release_global_atom( struct winstation *winstation, atom_t atom )
365 if (atom >= MIN_STR_ATOM)
367 struct atom_table *global_table = get_global_table( winstation, 0 );
368 if (global_table) delete_atom( global_table, atom, 1 );
372 /* add a global atom */
373 DECL_HANDLER(add_atom)
375 struct atom_table *table = get_table( req->table, 1 );
378 reply->atom = add_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
379 release_object( table );
383 /* delete a global atom */
384 DECL_HANDLER(delete_atom)
386 struct atom_table *table = get_table( req->table, 0 );
389 delete_atom( table, req->atom, 0 );
390 release_object( table );
394 /* find a global atom */
395 DECL_HANDLER(find_atom)
397 struct atom_table *table = get_table( req->table, 0 );
400 reply->atom = find_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
401 release_object( table );
405 /* get global atom name */
406 DECL_HANDLER(get_atom_information)
408 struct atom_table *table = get_table( req->table, 0 );
411 struct atom_entry *entry;
413 if ((entry = get_atom_entry( table, req->atom )))
415 size_t len = entry->len * sizeof(WCHAR);
416 if (get_reply_max_size())
417 set_reply_data( entry->str, min( len, get_reply_max_size()));
418 reply->count = entry->count;
419 reply->pinned = entry->pinned;
422 else reply->count = -1;
423 release_object( table );
427 /* set global atom name */
428 DECL_HANDLER(set_atom_information)
430 struct atom_table *table = get_table( req->table, 0 );
433 struct atom_entry *entry;
435 if ((entry = get_atom_entry( table, req->atom )))
437 if (req->pinned) entry->pinned = 1;
439 release_object( table );
443 /* init a (local) atom table */
444 DECL_HANDLER(init_atom_table)
446 struct atom_table* table = create_table( req->entries );
450 reply->table = alloc_handle( current->process, table, 0, 0 );
451 release_object( table );
455 /* set global atom name */
456 DECL_HANDLER(empty_atom_table)
458 struct atom_table *table = get_table( req->table, 1 );
462 struct atom_entry *entry;
464 for (i = 0; i <= table->last; i++)
466 entry = table->handles[i];
467 if (entry && (!entry->pinned || req->if_pinned))
469 if (entry->next) entry->next->prev = entry->prev;
470 if (entry->prev) entry->prev->next = entry->next;
471 else table->entries[entry->hash] = entry->next;
472 table->handles[i] = NULL;
476 release_object( table );