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 atom_table_destroy /* destroy */
82 static struct atom_table *global_table;
85 /* create an atom table */
86 static struct atom_table *create_table(int entries_count)
88 struct atom_table *table;
90 if ((table = alloc_object( &atom_table_ops )))
92 if ((entries_count < MIN_HASH_SIZE) ||
93 (entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
94 table->entries_count = entries_count;
95 if (!(table->entries = malloc( sizeof(*table->entries) * table->entries_count )))
97 set_error( STATUS_NO_MEMORY );
100 memset( table->entries, 0, sizeof(*table->entries) * table->entries_count );
103 if ((table->handles = mem_alloc( sizeof(*table->handles) * table->count )))
106 release_object( table );
112 /* retrieve an entry pointer from its atom */
113 static struct atom_entry *get_atom_entry( struct atom_table *table, atom_t atom )
115 struct atom_entry *entry = NULL;
116 if (table && (atom >= MIN_STR_ATOM) && (atom <= MIN_STR_ATOM + table->last))
117 entry = table->handles[atom - MIN_STR_ATOM];
118 if (!entry) set_error( STATUS_INVALID_HANDLE );
122 /* add an atom entry in the table and return its handle */
123 static atom_t add_atom_entry( struct atom_table *table, struct atom_entry *entry )
126 for (i = 0; i <= table->last; i++)
127 if (!table->handles[i]) goto found;
128 if (i == table->count)
130 struct atom_entry **new_table = NULL;
131 int new_size = table->count + table->count / 2;
132 if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
133 if (new_size > table->count)
134 new_table = realloc( table->handles, sizeof(*table->handles) * new_size );
137 set_error( STATUS_NO_MEMORY );
140 table->count = new_size;
141 table->handles = new_table;
145 table->handles[i] = entry;
146 entry->atom = i + MIN_STR_ATOM;
150 /* compute the hash code for a string */
151 static unsigned short atom_hash( struct atom_table *table, const WCHAR *str, size_t len )
154 unsigned short hash = 0;
155 for (i = 0; i < len; i++) hash ^= toupperW(str[i]) + i;
156 return hash % table->entries_count;
159 /* dump an atom table */
160 static void atom_table_dump( struct object *obj, int verbose )
163 struct atom_table *table = (struct atom_table *)obj;
164 assert( obj->ops == &atom_table_ops );
166 fprintf( stderr, "Atom table size=%d entries=%d\n",
167 table->last + 1, table->entries_count );
168 if (!verbose) return;
169 for (i = 0; i <= table->last; i++)
171 struct atom_entry *entry = table->handles[i];
172 if (!entry) continue;
173 fprintf( stderr, " %04x: ref=%d pinned=%c hash=%d \"",
174 entry->atom, entry->count, entry->pinned ? 'Y' : 'N', entry->hash );
175 dump_strW( entry->str, entry->len, stderr, "\"\"");
176 fprintf( stderr, "\"\n" );
180 /* destroy the atom table */
181 static void atom_table_destroy( struct object *obj )
184 struct atom_table *table = (struct atom_table *)obj;
185 assert( obj->ops == &atom_table_ops );
188 for (i = 0; i <= table->last; i++) free( table->handles[i] );
189 free( table->handles );
191 if (table->entries) free( table->entries );
194 /* find an atom entry in its hash list */
195 static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str,
196 size_t len, unsigned short hash )
198 struct atom_entry *entry = table->entries[hash];
201 if (entry->len == len && !memicmpW( entry->str, str, len )) break;
207 /* close the atom table; used on server exit */
208 void close_atom_table(void)
210 if (global_table) release_object( global_table );
213 /* add an atom to the table */
214 static atom_t add_atom( struct atom_table *table, const WCHAR *str, size_t len )
216 struct atom_entry *entry;
217 unsigned short hash = atom_hash( table, str, len );
222 set_error( STATUS_OBJECT_NAME_INVALID );
225 if (len > MAX_ATOM_LEN)
227 set_error( STATUS_INVALID_PARAMETER );
230 if ((entry = find_atom_entry( table, str, len, hash ))) /* exists already */
236 if ((entry = mem_alloc( sizeof(*entry) + (len - 1) * sizeof(WCHAR) )))
238 if ((atom = add_atom_entry( table, entry )))
241 if ((entry->next = table->entries[hash])) entry->next->prev = entry;
242 table->entries[hash] = entry;
247 memcpy( entry->str, str, len * sizeof(WCHAR) );
251 else set_error( STATUS_NO_MEMORY );
255 /* delete an atom from the table */
256 static void delete_atom( struct atom_table *table, atom_t atom )
258 struct atom_entry *entry = get_atom_entry( table, atom );
259 if (entry && !--entry->count)
261 if (entry->next) entry->next->prev = entry->prev;
262 if (entry->prev) entry->prev->next = entry->next;
263 else table->entries[entry->hash] = entry->next;
264 table->handles[atom - MIN_STR_ATOM] = NULL;
269 /* find an atom in the table */
270 static atom_t find_atom( struct atom_table *table, const WCHAR *str, size_t len )
272 struct atom_entry *entry;
276 set_error( STATUS_OBJECT_NAME_INVALID );
279 if (len > MAX_ATOM_LEN)
281 set_error( STATUS_INVALID_PARAMETER );
284 if (table && (entry = find_atom_entry( table, str, len, atom_hash(table, str, len) )))
286 set_error( STATUS_OBJECT_NAME_NOT_FOUND );
290 static struct atom_table* get_table( obj_handle_t h )
292 if (h) return (struct atom_table *)get_handle_obj( current->process, h, 0, &atom_table_ops );
294 if (!global_table && !(global_table = create_table( HASH_SIZE ))) return NULL;
295 return (struct atom_table *)grab_object( global_table );
298 /* add an atom in the global table; used for window properties */
299 atom_t add_global_atom( const WCHAR *str, size_t len )
301 if (!global_table && !(global_table = create_table( HASH_SIZE ))) return 0;
302 return add_atom( global_table, str, len );
305 /* find an atom in the global table; used for window properties */
306 atom_t find_global_atom( const WCHAR *str, size_t len )
308 struct atom_entry *entry;
310 if (!len || len > MAX_ATOM_LEN || !global_table) return 0;
311 if ((entry = find_atom_entry( global_table, str, len, atom_hash(global_table, str, len) )))
316 /* increment the ref count of a global atom; used for window properties */
317 int grab_global_atom( atom_t atom )
319 if (atom >= MIN_STR_ATOM)
321 struct atom_entry *entry = get_atom_entry( global_table, atom );
322 if (entry) entry->count++;
323 return (entry != NULL);
328 /* decrement the ref count of a global atom; used for window properties */
329 void release_global_atom( atom_t atom )
331 if (atom >= MIN_STR_ATOM) delete_atom( global_table, atom );
334 /* add a global atom */
335 DECL_HANDLER(add_atom)
337 struct atom_table *table = get_table( req->table );
340 reply->atom = add_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
341 release_object( table );
345 /* delete a global atom */
346 DECL_HANDLER(delete_atom)
348 struct atom_table *table = get_table( req->table );
351 delete_atom( table, req->atom );
352 release_object( table );
356 /* find a global atom */
357 DECL_HANDLER(find_atom)
359 struct atom_table *table = get_table( req->table );
362 reply->atom = find_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
363 release_object( table );
367 /* get global atom name */
368 DECL_HANDLER(get_atom_information)
370 struct atom_table *table = get_table( req->table );
373 struct atom_entry *entry;
375 if ((entry = get_atom_entry( table, req->atom )))
377 size_t len = entry->len * sizeof(WCHAR);
378 if (len <= get_reply_max_size()) set_reply_data( entry->str, len );
379 else set_error( STATUS_BUFFER_OVERFLOW );
380 reply->count = entry->count;
381 reply->pinned = entry->pinned;
383 else reply->count = -1;
384 release_object( table );
388 /* set global atom name */
389 DECL_HANDLER(set_atom_information)
391 struct atom_table *table = get_table( req->table );
394 struct atom_entry *entry;
396 if ((entry = get_atom_entry( table, req->atom )))
398 if (req->pinned) entry->pinned = 1;
400 release_object( table );
404 /* init a (local) atom table */
405 DECL_HANDLER(init_atom_table)
407 struct atom_table* table = create_table( req->entries );
411 reply->table = alloc_handle( current->process, table, 0, FALSE);
412 release_object( table );
416 /* set global atom name */
417 DECL_HANDLER(empty_atom_table)
419 struct atom_table *table = get_table( req->table );
423 struct atom_entry *entry;
425 for (i = 0; i <= table->last; i++)
427 entry = table->handles[i];
428 if (entry && (!entry->pinned || req->if_pinned))
430 if (entry->next) entry->next->prev = entry->prev;
431 if (entry->prev) entry->prev->next = entry->next;
432 else table->entries[entry->hash] = entry->next;
433 table->handles[i] = NULL;
437 release_object( table );