/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)bt_conv.c     10.7 (Sleepycat) 9/20/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif

#include "db_int.h"
#include "db_page.h"
#include "db_swap.h"
#include "btree.h"

/*
 * __bam_pgin --
 *      Convert host-specific page layout from the host-independent format
 *      stored on disk.
 *
 * PUBLIC: int __bam_pgin __P((db_pgno_t, void *, DBT *));
 */
int
__bam_pgin(pg, pp, cookie)
        db_pgno_t pg;
        void *pp;
        DBT *cookie;
{
        DB_PGINFO *pginfo;

        pginfo = (DB_PGINFO *)cookie->data;
        if (!pginfo->needswap)
                return (0);
        return (pg == PGNO_METADATA ?
            __bam_mswap(pp) : __db_pgin(pg, pginfo->db_pagesize, pp));
}

/*
 * __bam_pgout --
 *      Convert host-specific page layout to the host-independent format
 *      stored on disk.
 *
 * PUBLIC: int __bam_pgout __P((db_pgno_t, void *, DBT *));
 */
int
__bam_pgout(pg, pp, cookie)
        db_pgno_t pg;
        void *pp;
        DBT *cookie;
{
        DB_PGINFO *pginfo;

        pginfo = (DB_PGINFO *)cookie->data;
        if (!pginfo->needswap)
                return (0);
        return (pg == PGNO_METADATA ?
            __bam_mswap(pp) : __db_pgout(pg, pginfo->db_pagesize, pp));
}

/*
 * __bam_mswap --
 *      Swap the bytes on the btree metadata page.
 *
 * PUBLIC: int __bam_mswap __P((PAGE *));
 */
int
__bam_mswap(pg)
        PAGE *pg;
{
        u_int8_t *p;

        p = (u_int8_t *)pg;

        /* Swap the meta-data information. */
        SWAP32(p);              /* lsn.file */
        SWAP32(p);              /* lsn.offset */
        SWAP32(p);              /* pgno */
        SWAP32(p);              /* magic */
        SWAP32(p);              /* version */
        SWAP32(p);              /* pagesize */
        SWAP32(p);              /* maxkey */
        SWAP32(p);              /* minkey */
        SWAP32(p);              /* free */
        SWAP32(p);              /* flags */

        return (0);
}