/*
 * Copyright (c) 2004 Teodor Sigaev <teodor@sigaev.ru>
 * 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. Neither the name of the author nor the names of any co-contributors
 *        may be used to endorse or promote products derived from this software
 *        without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``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 CONTRIBUTORS 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.
 */
#ifndef __FLAT_DB__
#define __FLAT_DB__

#include <sys/types.h>
#include "tools.h"

typedef struct {
	off_t	freespace;
	size_t	lenfreespace;
	u_int32_t
		unused:31, 
		isopened:1;
} FDBHeader;

typedef struct {
	size_t 	length;
	char	data[1];
} FDBRecord;

#define RECHDRSZ	(offsetof(FDBRecord, data))

typedef struct {
	off_t	offset;
	size_t	length;
} FDBFreeSpace;

typedef struct {
	int	fd; /* file descriptor */
	u_int32_t	unused:31,
			readonly:1;
	u_int32_t	listlen;
	u_int32_t	listcur;
	FDBFreeSpace	*space;
} FDB;

int FDBOpen(FDB *db, char *file, int readonly);
int FDBClose(FDB *db);
int FDBPut(FDB *db, FDBRecord *record /*in*/, off_t *offset /*out*/);
int FDBGet(FDB *db, off_t offset /* in */, size_t length /*in, may =0, then stored size*/, FDBRecord **record /*out*/);
int FDBDelete(FDB *db, off_t offset /* in */, size_t length /*in, may =0, then stored size*/ );
void FDBVacuumFreeSpace(FDB *db); 

#define FDB_OK		0
#define FDB_NOTFOUND	1
#define FDB_ERROR	2
#define FDB_INCORRECT	3

#endif