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/*
 * Copyright (c) 2019 Matt Dunwoodie <ncon@noconroy.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef __FIXEDMAP_H__
#define __FIXEDMAP_H__

#include <sys/types.h>
#include <sys/refcnt.h>

#define FM_FOREACH(item, fm) \
    for (item = (fm)->map; item < (fm)->map + (fm)->size; item++)
#define FM_FOREACH_FILLED(item, fm) \
    FM_FOREACH(item, fm) if (item->state == FM_ITEM_FILLED)
#define FM_FOREACH_EMPTY(item, fm) \
    FM_FOREACH(item, fm) if (item->state == FM_ITEM_EMPTY)

struct fixed_map {
	size_t		 size;
	struct map_item {
		enum {
			FM_ITEM_EMPTY = 0,
			FM_ITEM_FILLED,
		}		 state;
		uint32_t	 key;
		struct refcnt	 cnt;
		void		*value;
	}			*map;
};

void fm_init(struct fixed_map *);
void fm_destroy(struct fixed_map *);
uint32_t fm_insert(struct fixed_map *, void *);
void *fm_ref(struct fixed_map *, uint32_t);
void fm_put(struct fixed_map *, uint32_t);
void fm_remove(struct fixed_map *, uint32_t);

#endif /* __FIXEDMAP_H__ */