bt_conv.c
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上传日期:2022-05-23
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文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: bt_conv.c,v 11.13 2002/08/06 06:11:12 bostic Exp $";
- #endif /* not lint */
- #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/btree.h"
- /*
- * __bam_pgin --
- * Convert host-specific page layout from the host-independent format
- * stored on disk.
- *
- * PUBLIC: int __bam_pgin __P((DB_ENV *, DB *, db_pgno_t, void *, DBT *));
- */
- int
- __bam_pgin(dbenv, dummydbp, pg, pp, cookie)
- DB_ENV *dbenv;
- DB *dummydbp;
- db_pgno_t pg;
- void *pp;
- DBT *cookie;
- {
- DB_PGINFO *pginfo;
- PAGE *h;
- pginfo = (DB_PGINFO *)cookie->data;
- if (!F_ISSET(pginfo, DB_AM_SWAP))
- return (0);
- h = pp;
- return (TYPE(h) == P_BTREEMETA ? __bam_mswap(pp) :
- __db_byteswap(dbenv, dummydbp, pg, pp, pginfo->db_pagesize, 1));
- }
- /*
- * __bam_pgout --
- * Convert host-specific page layout to the host-independent format
- * stored on disk.
- *
- * PUBLIC: int __bam_pgout __P((DB_ENV *, DB *, db_pgno_t, void *, DBT *));
- */
- int
- __bam_pgout(dbenv, dummydbp, pg, pp, cookie)
- DB_ENV *dbenv;
- DB *dummydbp;
- db_pgno_t pg;
- void *pp;
- DBT *cookie;
- {
- DB_PGINFO *pginfo;
- PAGE *h;
- pginfo = (DB_PGINFO *)cookie->data;
- if (!F_ISSET(pginfo, DB_AM_SWAP))
- return (0);
- h = pp;
- return (TYPE(h) == P_BTREEMETA ? __bam_mswap(pp) :
- __db_byteswap(dbenv, dummydbp, pg, pp, pginfo->db_pagesize, 0));
- }
- /*
- * __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;
- __db_metaswap(pg);
- p = (u_int8_t *)pg + sizeof(DBMETA);
- SWAP32(p); /* maxkey */
- SWAP32(p); /* minkey */
- SWAP32(p); /* re_len */
- SWAP32(p); /* re_pad */
- SWAP32(p); /* root */
- p += 92 * sizeof(u_int32_t); /* unused */
- SWAP32(p); /* crypto_magic */
- return (0);
- }