зеркало из https://github.com/mozilla/gecko-dev.git
108 строки
2.1 KiB
C
108 строки
2.1 KiB
C
/*-
|
|
* 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 10.6 (Sleepycat) 4/10/98";
|
|
#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 */
|
|
|
|
/* Swap the statistics. */
|
|
p = (u_int8_t *)&((BTMETA *)pg)->stat;
|
|
SWAP32(p); /* bt_freed */
|
|
SWAP32(p); /* bt_pfxsaved */
|
|
SWAP32(p); /* bt_split */
|
|
SWAP32(p); /* bt_rootsplit */
|
|
SWAP32(p); /* bt_fastsplit */
|
|
SWAP32(p); /* bt_added */
|
|
SWAP32(p); /* bt_deleted */
|
|
SWAP32(p); /* bt_get */
|
|
SWAP32(p); /* bt_cache_hit */
|
|
SWAP32(p); /* bt_cache_miss */
|
|
|
|
return (0);
|
|
}
|