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111 lines
2.2 KiB
111 lines
2.2 KiB
3 years ago
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998, 1999
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)hash_conv.c 11.1 (Sleepycat) 7/24/99";
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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 "hash.h"
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/*
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* CDB___ham_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 CDB___ham_pgin __P((db_pgno_t, void *, DBT *));
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*/
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int
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CDB___ham_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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PAGE *h;
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h = pp;
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pginfo = (DB_PGINFO *)cookie->data;
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/*
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* The hash access method does blind reads of pages, causing them
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* to be created. If the type field isn't set it's one of them,
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* initialize the rest of the page and return.
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*/
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if (h->type == 0) {
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P_INIT(pp, pginfo->db_pagesize,
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pg, PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
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return (0);
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}
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if (!pginfo->needswap)
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return (0);
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return (h->type == P_HASHMETA ?
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CDB___ham_mswap(pp) : CDB___db_byteswap(pg, pp, pginfo->db_pagesize, 1));
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}
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/*
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* CDB___ham_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 CDB___ham_pgout __P((db_pgno_t, void *, DBT *));
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*/
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int
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CDB___ham_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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PAGE *h;
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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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h = pp;
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return (h->type == P_HASHMETA ?
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CDB___ham_mswap(pp) : CDB___db_byteswap(pg, pp, pginfo->db_pagesize, 0));
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}
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/*
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* CDB___ham_mswap --
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* Swap the bytes on the hash metadata page.
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*
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* PUBLIC: int CDB___ham_mswap __P((void *));
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*/
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int
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CDB___ham_mswap(pg)
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void *pg;
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{
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u_int8_t *p;
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int i;
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CDB___db_metaswap(pg);
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p = (u_int8_t *)pg + sizeof(DBMETA);
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SWAP32(p); /* max_bucket */
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SWAP32(p); /* high_mask */
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SWAP32(p); /* low_mask */
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SWAP32(p); /* ffactor */
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SWAP32(p); /* nelem */
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SWAP32(p); /* h_charkey */
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for (i = 0; i < NCACHED; ++i)
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SWAP32(p); /* spares */
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return (0);
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}
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