/* ==== cluster.h ============================================================
 * Copyright (c) 1995 by Chris Provenzano, proven@mit.edu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by Chris Provenzano.
 * 4. The name of Chris Provenzano may not be used to endorse or promote 
 *	  products derived from this software without specific prior written
 *	  permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 *
 * Description : Main fc functions.
 *
 *  1.00 95/06/28  proven
 *      -Started coding this file.
 */

#include "cdefs.h"

struct cluster_header {
	struct cluster_header	* next;
	struct cluster_block	* block;
	char					  data[0];
};

struct cluster_block {
	struct cluster_block	* next;
	unsigned int 			  count_total;
	unsigned int 			  count_free;
	struct cluster_header	* first_free;
	struct cluster_header	* first_used;
	char					  data[0];
};

/* The only exported structure */
typedef struct cluster {
	struct cluster_block	* first;
	struct cluster_block	* last;
	unsigned int			  cmin;		/* cluster minimum */
	size_t					  size;
} cluster;

__BEGIN_DECLS

int 	cluster_init		__P((cluster *, size_t));
int 	cluster_prealloc	__P((cluster *, unsigned int));
void * 	cluster_alloc		__P((cluster *));
void 	cluster_free		__P((cluster *, void *));

__END_DECLS