qam_conv.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: qam_conv.c,v 12.1 2005/06/16 20:23:32 bostic Exp $
 */

#include "db_config.h"

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

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/db_swap.h"
#include "dbinc/db_am.h"
#include "dbinc/qam.h"

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

         __db_metaswap(pg);

         p = (u_int8_t *)pg + sizeof(DBMETA);

        SWAP32(p);              /* first_recno */
        SWAP32(p);              /* cur_recno */
        SWAP32(p);              /* re_len */
        SWAP32(p);              /* re_pad */
        SWAP32(p);              /* rec_page */
        SWAP32(p);              /* page_ext */
        p += 91 * sizeof(u_int32_t); /* unused */
        SWAP32(p);              /* crypto_magic */

        return (0);
}

/*
 * __qam_pgin_out --
 *      Convert host-specific page layout to/from the host-independent format
 *      stored on disk.
 *  We only need to fix up a few fields in the header
 *
 * PUBLIC: int __qam_pgin_out __P((DB_ENV *, db_pgno_t, void *, DBT *));
 */
int
__qam_pgin_out(dbenv, pg, pp, cookie)
        DB_ENV *dbenv;
        db_pgno_t pg;
        void *pp;
        DBT *cookie;
{
        DB_PGINFO *pginfo;
        QPAGE *h;

        COMPQUIET(pg, 0);
        COMPQUIET(dbenv, NULL);
        pginfo = (DB_PGINFO *)cookie->data;
        if (!F_ISSET(pginfo, DB_AM_SWAP))
                return (0);

        h = pp;
        if (h->type == P_QAMMETA)
            return (__qam_mswap(pp));

        M_32_SWAP(h->lsn.file);
        M_32_SWAP(h->lsn.offset);
        M_32_SWAP(h->pgno);

        return (0);
}

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