#ifndef __FLAT_DB__
#define __FLAT_DB__

#include <sys/types.h>

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

typedef struct {
	size_t 	length;
	char	*data;
} FDBRecord;

#define RECHDRSZ	(sizeof(size_t))

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