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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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_open_file, /* open_file */
88 no_close_handle, /* close_handle */
89 atom_table_destroy /* destroy */
92 static struct atom_table *global_table;
94 /* create an atom table */
95 static struct atom_table *create_table(int entries_count)
97 struct atom_table *table;
99 if ((table = alloc_object( &atom_table_ops )))
101 if ((entries_count < MIN_HASH_SIZE) ||
102 (entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
103 table->entries_count = entries_count;
104 if (!(table->entries = malloc( sizeof(*table->entries) * table->entries_count )))
106 set_error( STATUS_NO_MEMORY );
109 memset( table->entries, 0, sizeof(*table->entries) * table->entries_count );
112 if ((table->handles = mem_alloc( sizeof(*table->handles) * table->count )))
115 release_object( table );
121 /* retrieve an entry pointer from its atom */
122 static struct atom_entry *get_atom_entry( struct atom_table *table, atom_t atom )
124 struct atom_entry *entry = NULL;
125 if (table && (atom >= MIN_STR_ATOM) && (atom <= MIN_STR_ATOM + table->last))
126 entry = table->handles[atom - MIN_STR_ATOM];
127 if (!entry) set_error( STATUS_INVALID_HANDLE );
131 /* add an atom entry in the table and return its handle */
132 static atom_t add_atom_entry( struct atom_table *table, struct atom_entry *entry )
135 for (i = 0; i <= table->last; i++)
136 if (!table->handles[i]) goto found;
137 if (i == table->count)
139 struct atom_entry **new_table = NULL;
140 int new_size = table->count + table->count / 2;
141 if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
142 if (new_size > table->count)
143 new_table = realloc( table->handles, sizeof(*table->handles) * new_size );
146 set_error( STATUS_NO_MEMORY );
149 table->count = new_size;
150 table->handles = new_table;
154 table->handles[i] = entry;
155 entry->atom = i + MIN_STR_ATOM;
159 /* compute the hash code for a string */
160 static unsigned short atom_hash( struct atom_table *table, const WCHAR *str, data_size_t len )
163 unsigned short hash = 0;
164 for (i = 0; i < len; i++) hash ^= toupperW(str[i]) + i;
165 return hash % table->entries_count;
168 /* dump an atom table */
169 static void atom_table_dump( struct object *obj, int verbose )
172 struct atom_table *table = (struct atom_table *)obj;
173 assert( obj->ops == &atom_table_ops );
175 fprintf( stderr, "Atom table size=%d entries=%d\n",
176 table->last + 1, table->entries_count );
177 if (!verbose) return;
178 for (i = 0; i <= table->last; i++)
180 struct atom_entry *entry = table->handles[i];
181 if (!entry) continue;
182 fprintf( stderr, " %04x: ref=%d pinned=%c hash=%d \"",
183 entry->atom, entry->count, entry->pinned ? 'Y' : 'N', entry->hash );
184 dump_strW( entry->str, entry->len, stderr, "\"\"");
185 fprintf( stderr, "\"\n" );
189 /* destroy the atom table */
190 static void atom_table_destroy( struct object *obj )
193 struct atom_table *table = (struct atom_table *)obj;
194 assert( obj->ops == &atom_table_ops );
197 for (i = 0; i <= table->last; i++) free( table->handles[i] );
198 free( table->handles );
200 free( table->entries );
203 /* find an atom entry in its hash list */
204 static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str,
205 data_size_t len, unsigned short hash )
207 struct atom_entry *entry = table->entries[hash];
210 if (entry->len == len && !memicmpW( entry->str, str, len )) break;
216 /* add an atom to the table */
217 static atom_t add_atom( struct atom_table *table, const WCHAR *str, data_size_t len )
219 struct atom_entry *entry;
220 unsigned short hash = atom_hash( table, str, len );
225 set_error( STATUS_OBJECT_NAME_INVALID );
228 if (len > MAX_ATOM_LEN)
230 set_error( STATUS_INVALID_PARAMETER );
233 if ((entry = find_atom_entry( table, str, len, hash ))) /* exists already */
239 if ((entry = mem_alloc( sizeof(*entry) + (len - 1) * sizeof(WCHAR) )))
241 if ((atom = add_atom_entry( table, entry )))
244 if ((entry->next = table->entries[hash])) entry->next->prev = entry;
245 table->entries[hash] = entry;
250 memcpy( entry->str, str, len * sizeof(WCHAR) );
254 else set_error( STATUS_NO_MEMORY );
258 /* delete an atom from the table */
259 static void delete_atom( struct atom_table *table, atom_t atom, int if_pinned )
261 struct atom_entry *entry = get_atom_entry( table, atom );
263 if (entry->pinned && !if_pinned) set_error( STATUS_WAS_LOCKED );
264 else if (!--entry->count)
266 if (entry->next) entry->next->prev = entry->prev;
267 if (entry->prev) entry->prev->next = entry->next;
268 else table->entries[entry->hash] = entry->next;
269 table->handles[atom - MIN_STR_ATOM] = NULL;
274 /* find an atom in the table */
275 static atom_t find_atom( struct atom_table *table, const WCHAR *str, data_size_t len )
277 struct atom_entry *entry;
281 set_error( STATUS_OBJECT_NAME_INVALID );
284 if (len > MAX_ATOM_LEN)
286 set_error( STATUS_INVALID_PARAMETER );
289 if (table && (entry = find_atom_entry( table, str, len, atom_hash(table, str, len) )))
291 set_error( STATUS_OBJECT_NAME_NOT_FOUND );
295 static struct atom_table *get_global_table( struct winstation *winstation, int create )
297 struct atom_table *table = winstation ? winstation->atom_table : global_table;
302 table = create_table( HASH_SIZE );
303 if (winstation) winstation->atom_table = table;
306 global_table = table;
307 make_object_static( &global_table->obj );
310 else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
315 static struct atom_table *get_table( obj_handle_t h, int create )
317 struct atom_table *table = NULL;
321 table = (struct atom_table *)get_handle_obj( current->process, h, 0, &atom_table_ops );
325 table = get_global_table( NULL, 1 );
326 if (table) grab_object( table );
331 /* add an atom in the global table; used for window properties */
332 atom_t add_global_atom( struct winstation *winstation, const WCHAR *str, data_size_t len )
334 struct atom_table *global_table = get_global_table( winstation, 1 );
335 if (!global_table) return 0;
336 return add_atom( global_table, str, len );
339 /* find an atom in the global table; used for window properties */
340 atom_t find_global_atom( struct winstation *winstation, const WCHAR *str, data_size_t len )
342 struct atom_table *global_table = get_global_table( winstation, 0 );
343 struct atom_entry *entry;
345 if (!len || len > MAX_ATOM_LEN || !global_table) return 0;
346 if ((entry = find_atom_entry( global_table, str, len, atom_hash(global_table, str, len) )))
351 /* increment the ref count of a global atom; used for window properties */
352 int grab_global_atom( struct winstation *winstation, atom_t atom )
354 if (atom >= MIN_STR_ATOM)
356 struct atom_table *global_table = get_global_table( winstation, 0 );
359 struct atom_entry *entry = get_atom_entry( global_table, atom );
360 if (entry) entry->count++;
361 return (entry != NULL);
368 /* decrement the ref count of a global atom; used for window properties */
369 void release_global_atom( struct winstation *winstation, atom_t atom )
371 if (atom >= MIN_STR_ATOM)
373 struct atom_table *global_table = get_global_table( winstation, 0 );
374 if (global_table) delete_atom( global_table, atom, 1 );
378 /* add a global atom */
379 DECL_HANDLER(add_atom)
381 struct atom_table *table = get_table( req->table, 1 );
384 reply->atom = add_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
385 release_object( table );
389 /* delete a global atom */
390 DECL_HANDLER(delete_atom)
392 struct atom_table *table = get_table( req->table, 0 );
395 delete_atom( table, req->atom, 0 );
396 release_object( table );
400 /* find a global atom */
401 DECL_HANDLER(find_atom)
403 struct atom_table *table = get_table( req->table, 0 );
406 reply->atom = find_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
407 release_object( table );
411 /* get global atom name */
412 DECL_HANDLER(get_atom_information)
414 struct atom_table *table = get_table( req->table, 0 );
417 struct atom_entry *entry;
419 if ((entry = get_atom_entry( table, req->atom )))
421 data_size_t len = entry->len * sizeof(WCHAR);
422 if (get_reply_max_size())
423 set_reply_data( entry->str, min( len, get_reply_max_size()));
424 reply->count = entry->count;
425 reply->pinned = entry->pinned;
428 else reply->count = -1;
429 release_object( table );
433 /* set global atom name */
434 DECL_HANDLER(set_atom_information)
436 struct atom_table *table = get_table( req->table, 0 );
439 struct atom_entry *entry;
441 if ((entry = get_atom_entry( table, req->atom )))
443 if (req->pinned) entry->pinned = 1;
445 release_object( table );
449 /* init a (local) atom table */
450 DECL_HANDLER(init_atom_table)
452 struct atom_table* table = create_table( req->entries );
456 reply->table = alloc_handle( current->process, table, 0, 0 );
457 release_object( table );
461 /* set global atom name */
462 DECL_HANDLER(empty_atom_table)
464 struct atom_table *table = get_table( req->table, 1 );
468 struct atom_entry *entry;
470 for (i = 0; i <= table->last; i++)
472 entry = table->handles[i];
473 if (entry && (!entry->pinned || req->if_pinned))
475 if (entry->next) entry->next->prev = entry->prev;
476 if (entry->prev) entry->prev->next = entry->next;
477 else table->entries[entry->hash] = entry->next;
478 table->handles[i] = NULL;
482 release_object( table );