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* $Id: idtable.h,v 1.5 2003/07/31 01:32:34 cbiere Exp $
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* Copyright (c) 2001-2003, Richard Eckart
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*----------------------------------------------------------------------
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* This file is part of gtk-gnutella.
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* gtk-gnutella is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* gtk-gnutella is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with gtk-gnutella; if not, write to the Free Software
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*----------------------------------------------------------------------
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* The idtable provides a automatically growing table which can resolve
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* ids to values very fast. The ids are issues by the table and internally
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* refer to an array row in the table. The table starts with an initial size
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* and if full is extended by a definable number of rows. Initial size and
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* extend size are internally rounded up to a multiple of 32. There is no
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* limitation to the value and is can be queried whether a given id is in
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* You can also request special id/value combinations, but you need to keep
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* in mind that the ids are row numbers. The table is then automatically
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* grown to contain the requested id, but you can't shrink it later, because
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* that would mean that the row numbers change and the ids already issued
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* would become invalid.
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* If the application needs to shrink a table, I suggest creating a new
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* table and request the needed number of ids from that. Of course all
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* ids currently in use by the application must be updated. Once that is
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* done, flush and destroy the old table.
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#define idtable_ids(tbl) (tbl->ids)
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#define idtable_size(tbl) (tbl->size)
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typedef struct idtable {
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guint32 size; /* numbers of slots available */
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guint32 esize; /* number of slots to add if table is full */
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guint32 ids; /* numbers of slots currently used */
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guint32 last_id; /* last issued id */
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guint32 *used_ids; /* binary array of used ids */
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gpointer *data; /* actual table array */
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idtable_t *idtable_new(guint32 isize, guint32 esize);
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void idtable_destroy(idtable_t *table);
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guint32 idtable_new_id(idtable_t *tbl, gpointer value);
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void idtable_new_id_value(idtable_t *tbl, guint32 id, gpointer value);
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void idtable_free_id(idtable_t *tbl, guint32 id);
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G_INLINE_FUNC gboolean idtable_is_id_used(idtable_t *tbl, guint32 id);
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void idtable_set_value(idtable_t *tbl, guint32 id, gpointer value);
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gpointer idtable_get_value(idtable_t *tbl, guint32 id);
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#endif /* _idtable_h_ */
added
removed
src/idtable.h
