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"
37 #define MIN_HASH_SIZE 4
38 #define MAX_HASH_SIZE 0x200
40 #define MAX_ATOM_LEN 255
41 #define MIN_STR_ATOM 0xc000
42 #define MAX_ATOMS 0x4000
46 struct atom_entry *next; /* hash table list */
47 struct atom_entry *prev; /* hash table list */
48 int count; /* reference count */
49 short pinned; /* whether the atom is pinned or not */
50 atom_t atom; /* atom handle */
51 unsigned short hash; /* string hash */
52 unsigned short len; /* string len */
53 WCHAR str[1]; /* atom string */
58 struct object obj; /* object header */
59 int count; /* count of atom handles */
60 int last; /* last handle in-use */
61 struct atom_entry **handles; /* atom handles */
62 int entries_count; /* humber of hash entries */
63 struct atom_entry **entries; /* hash table entries */
66 static void atom_table_dump( struct object *obj, int verbose );
67 static void atom_table_destroy( struct object *obj );
69 static const struct object_ops atom_table_ops =
71 sizeof(struct atom_table), /* size */
72 atom_table_dump, /* dump */
73 no_add_queue, /* add_queue */
74 NULL, /* remove_queue */
77 no_signal, /* signal */
78 no_get_fd, /* get_fd */
79 no_close_handle, /* close_handle */
80 atom_table_destroy /* destroy */
83 static struct atom_table *global_table;
86 /* create an atom table */
87 static struct atom_table *create_table(int entries_count)
89 struct atom_table *table;
91 if ((table = alloc_object( &atom_table_ops )))
93 if ((entries_count < MIN_HASH_SIZE) ||
94 (entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
95 table->entries_count = entries_count;
96 if (!(table->entries = malloc( sizeof(*table->entries) * table->entries_count )))
98 set_error( STATUS_NO_MEMORY );
101 memset( table->entries, 0, sizeof(*table->entries) * table->entries_count );
104 if ((table->handles = mem_alloc( sizeof(*table->handles) * table->count )))
107 release_object( table );
113 /* retrieve an entry pointer from its atom */
114 static struct atom_entry *get_atom_entry( struct atom_table *table, atom_t atom )
116 struct atom_entry *entry = NULL;
117 if (table && (atom >= MIN_STR_ATOM) && (atom <= MIN_STR_ATOM + table->last))
118 entry = table->handles[atom - MIN_STR_ATOM];
119 if (!entry) set_error( STATUS_INVALID_HANDLE );
123 /* add an atom entry in the table and return its handle */
124 static atom_t add_atom_entry( struct atom_table *table, struct atom_entry *entry )
127 for (i = 0; i <= table->last; i++)
128 if (!table->handles[i]) goto found;
129 if (i == table->count)
131 struct atom_entry **new_table = NULL;
132 int new_size = table->count + table->count / 2;
133 if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
134 if (new_size > table->count)
135 new_table = realloc( table->handles, sizeof(*table->handles) * new_size );
138 set_error( STATUS_NO_MEMORY );
141 table->count = new_size;
142 table->handles = new_table;
146 table->handles[i] = entry;
147 entry->atom = i + MIN_STR_ATOM;
151 /* compute the hash code for a string */
152 static unsigned short atom_hash( struct atom_table *table, const WCHAR *str, size_t len )
155 unsigned short hash = 0;
156 for (i = 0; i < len; i++) hash ^= toupperW(str[i]) + i;
157 return hash % table->entries_count;
160 /* dump an atom table */
161 static void atom_table_dump( struct object *obj, int verbose )
164 struct atom_table *table = (struct atom_table *)obj;
165 assert( obj->ops == &atom_table_ops );
167 fprintf( stderr, "Atom table size=%d entries=%d\n",
168 table->last + 1, table->entries_count );
169 if (!verbose) return;
170 for (i = 0; i <= table->last; i++)
172 struct atom_entry *entry = table->handles[i];
173 if (!entry) continue;
174 fprintf( stderr, " %04x: ref=%d pinned=%c hash=%d \"",
175 entry->atom, entry->count, entry->pinned ? 'Y' : 'N', entry->hash );
176 dump_strW( entry->str, entry->len, stderr, "\"\"");
177 fprintf( stderr, "\"\n" );
181 /* destroy the atom table */
182 static void atom_table_destroy( struct object *obj )
185 struct atom_table *table = (struct atom_table *)obj;
186 assert( obj->ops == &atom_table_ops );
189 for (i = 0; i <= table->last; i++) free( table->handles[i] );
190 free( table->handles );
192 if (table->entries) free( table->entries );
195 /* find an atom entry in its hash list */
196 static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str,
197 size_t len, unsigned short hash )
199 struct atom_entry *entry = table->entries[hash];
202 if (entry->len == len && !memicmpW( entry->str, str, len )) break;
208 /* close the atom table; used on server exit */
209 void close_atom_table(void)
211 if (global_table) release_object( global_table );
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_table( obj_handle_t h )
295 if (h) return (struct atom_table *)get_handle_obj( current->process, h, 0, &atom_table_ops );
297 if (!global_table && !(global_table = create_table( HASH_SIZE ))) return NULL;
298 return (struct atom_table *)grab_object( global_table );
301 /* add an atom in the global table; used for window properties */
302 atom_t add_global_atom( const WCHAR *str, size_t len )
304 if (!global_table && !(global_table = create_table( HASH_SIZE ))) return 0;
305 return add_atom( global_table, str, len );
308 /* find an atom in the global table; used for window properties */
309 atom_t find_global_atom( const WCHAR *str, size_t len )
311 struct atom_entry *entry;
313 if (!len || len > MAX_ATOM_LEN || !global_table) return 0;
314 if ((entry = find_atom_entry( global_table, str, len, atom_hash(global_table, str, len) )))
319 /* increment the ref count of a global atom; used for window properties */
320 int grab_global_atom( atom_t atom )
322 if (atom >= MIN_STR_ATOM)
324 struct atom_entry *entry = get_atom_entry( global_table, atom );
325 if (entry) entry->count++;
326 return (entry != NULL);
331 /* decrement the ref count of a global atom; used for window properties */
332 void release_global_atom( atom_t atom )
334 if (atom >= MIN_STR_ATOM) delete_atom( global_table, atom, 1 );
337 /* add a global atom */
338 DECL_HANDLER(add_atom)
340 struct atom_table *table = get_table( req->table );
343 reply->atom = add_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
344 release_object( table );
348 /* delete a global atom */
349 DECL_HANDLER(delete_atom)
351 struct atom_table *table = get_table( req->table );
354 delete_atom( table, req->atom, 0 );
355 release_object( table );
359 /* find a global atom */
360 DECL_HANDLER(find_atom)
362 struct atom_table *table = get_table( req->table );
365 reply->atom = find_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
366 release_object( table );
370 /* get global atom name */
371 DECL_HANDLER(get_atom_information)
373 struct atom_table *table = get_table( req->table );
376 struct atom_entry *entry;
378 if ((entry = get_atom_entry( table, req->atom )))
380 size_t len = entry->len * sizeof(WCHAR);
381 if (len <= get_reply_max_size()) set_reply_data( entry->str, len );
382 else if (get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
383 reply->count = entry->count;
384 reply->pinned = entry->pinned;
386 else reply->count = -1;
387 release_object( table );
391 /* set global atom name */
392 DECL_HANDLER(set_atom_information)
394 struct atom_table *table = get_table( req->table );
397 struct atom_entry *entry;
399 if ((entry = get_atom_entry( table, req->atom )))
401 if (req->pinned) entry->pinned = 1;
403 release_object( table );
407 /* init a (local) atom table */
408 DECL_HANDLER(init_atom_table)
410 struct atom_table* table = create_table( req->entries );
414 reply->table = alloc_handle( current->process, table, 0, FALSE);
415 release_object( table );
419 /* set global atom name */
420 DECL_HANDLER(empty_atom_table)
422 struct atom_table *table = get_table( req->table );
426 struct atom_entry *entry;
428 for (i = 0; i <= table->last; i++)
430 entry = table->handles[i];
431 if (entry && (!entry->pinned || req->if_pinned))
433 if (entry->next) entry->next->prev = entry->prev;
434 if (entry->prev) entry->prev->next = entry->next;
435 else table->entries[entry->hash] = entry->next;
436 table->handles[i] = NULL;
440 release_object( table );