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95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)bt_conv.c 10.7 (Sleepycat) 9/20/98";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#endif
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#include "db_int.h"
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#include "db_page.h"
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#include "db_swap.h"
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#include "btree.h"
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/*
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* __bam_pgin --
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* Convert host-specific page layout from the host-independent format
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* stored on disk.
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*
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* PUBLIC: int __bam_pgin __P((db_pgno_t, void *, DBT *));
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*/
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int
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__bam_pgin(pg, pp, cookie)
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db_pgno_t pg;
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void *pp;
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DBT *cookie;
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{
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DB_PGINFO *pginfo;
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pginfo = (DB_PGINFO *)cookie->data;
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if (!pginfo->needswap)
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return (0);
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return (pg == PGNO_METADATA ?
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__bam_mswap(pp) : __db_pgin(pg, pginfo->db_pagesize, pp));
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}
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/*
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* __bam_pgout --
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* Convert host-specific page layout to the host-independent format
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* stored on disk.
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*
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* PUBLIC: int __bam_pgout __P((db_pgno_t, void *, DBT *));
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*/
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int
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__bam_pgout(pg, pp, cookie)
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db_pgno_t pg;
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void *pp;
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DBT *cookie;
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{
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DB_PGINFO *pginfo;
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pginfo = (DB_PGINFO *)cookie->data;
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if (!pginfo->needswap)
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return (0);
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return (pg == PGNO_METADATA ?
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__bam_mswap(pp) : __db_pgout(pg, pginfo->db_pagesize, pp));
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}
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/*
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* __bam_mswap --
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* Swap the bytes on the btree metadata page.
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*
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* PUBLIC: int __bam_mswap __P((PAGE *));
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*/
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int
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__bam_mswap(pg)
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PAGE *pg;
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{
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u_int8_t *p;
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p = (u_int8_t *)pg;
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/* Swap the meta-data information. */
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SWAP32(p); /* lsn.file */
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SWAP32(p); /* lsn.offset */
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SWAP32(p); /* pgno */
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SWAP32(p); /* magic */
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SWAP32(p); /* version */
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SWAP32(p); /* pagesize */
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SWAP32(p); /* maxkey */
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SWAP32(p); /* minkey */
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SWAP32(p); /* free */
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SWAP32(p); /* flags */
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return (0);
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}
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