1 /*-
2 * See the file LICENSE for redistribution information.
3 *
4 * Copyright (c) 1996, 1997
5 * Sleepycat Software. All rights reserved.
6 */
7 /*
8 * Copyright (c) 1998 by Sun Microsystems, Inc.
9 * All rights reserved.
10 */
11
12 #include "config.h"
13
14 #pragma ident "%Z%%M% %I% %E% SMI"
15
16 #ifndef lint
17 static const char sccsid[] = "@(#)hash_conv.c 10.4 (Sleepycat) 9/15/97";
18 static const char sccsi2[] = "%W% (Sun) %G%";
19 #endif /* not lint */
20
21 #ifndef NO_SYSTEM_INCLUDES
22 #include <sys/types.h>
23 #endif
24
25 #include "db_int.h"
26 #include "db_page.h"
27 #include "db_swap.h"
28 #include "hash.h"
29
30 /*
31 * __ham_pgin --
32 * Convert host-specific page layout from the host-independent format
33 * stored on disk.
34 *
35 * PUBLIC: int __ham_pgin __P((db_pgno_t, void *, DBT *));
36 */
37 int
__ham_pgin(pg,pp,cookie)38 __ham_pgin(pg, pp, cookie)
39 db_pgno_t pg;
40 void *pp;
41 DBT *cookie;
42 {
43 DB_PGINFO *pginfo;
44 u_int32_t tpgno;
45
46 pginfo = (DB_PGINFO *)cookie->data;
47 tpgno = PGNO((PAGE *)pp);
48 if (pginfo->needswap)
49 M_32_SWAP(tpgno);
50
51 if (pg != PGNO_METADATA && pg != tpgno) {
52 P_INIT(pp, pginfo->db_pagesize,
53 pg, PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
54 return (0);
55 }
56
57 if (!pginfo->needswap)
58 return (0);
59 return (pg == PGNO_METADATA ?
60 __ham_mswap(pp) : __db_pgin(pg, pginfo->db_pagesize, pp));
61 }
62
63 /*
64 * __ham_pgout --
65 * Convert host-specific page layout to the host-independent format
66 * stored on disk.
67 *
68 * PUBLIC: int __ham_pgout __P((db_pgno_t, void *, DBT *));
69 */
70 int
__ham_pgout(pg,pp,cookie)71 __ham_pgout(pg, pp, cookie)
72 db_pgno_t pg;
73 void *pp;
74 DBT *cookie;
75 {
76 DB_PGINFO *pginfo;
77
78 pginfo = (DB_PGINFO *)cookie->data;
79 if (!pginfo->needswap)
80 return (0);
81 return (pg == PGNO_METADATA ?
82 __ham_mswap(pp) : __db_pgout(pg, pginfo->db_pagesize, pp));
83 }
84
85 /*
86 * __ham_mswap --
87 * Swap the bytes on the hash metadata page.
88 *
89 * PUBLIC: int __ham_mswap __P((void *));
90 */
91 int
__ham_mswap(pg)92 __ham_mswap(pg)
93 void *pg;
94 {
95 u_int8_t *p;
96 int i;
97
98 p = (u_int8_t *)pg;
99 SWAP32(p); /* lsn part 1 */
100 SWAP32(p); /* lsn part 2 */
101 SWAP32(p); /* pgno */
102 SWAP32(p); /* magic */
103 SWAP32(p); /* version */
104 SWAP32(p); /* pagesize */
105 SWAP32(p); /* ovfl_point */
106 SWAP32(p); /* last_freed */
107 SWAP32(p); /* max_bucket */
108 SWAP32(p); /* high_mask */
109 SWAP32(p); /* low_mask */
110 SWAP32(p); /* ffactor */
111 SWAP32(p); /* nelem */
112 SWAP32(p); /* h_charkey */
113 SWAP32(p); /* flags */
114 for (i = 0; i < NCACHED; ++i)
115 SWAP32(p); /* spares */
116 return (0);
117 }
118