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