1*7c478bd9Sstevel@tonic-gate /*-
2*7c478bd9Sstevel@tonic-gate  * See the file LICENSE for redistribution information.
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * Copyright (c) 1996, 1997
5*7c478bd9Sstevel@tonic-gate  *	Sleepycat Software.  All rights reserved.
6*7c478bd9Sstevel@tonic-gate  */
7*7c478bd9Sstevel@tonic-gate /*
8*7c478bd9Sstevel@tonic-gate  * Copyright (c) 1998 by Sun Microsystems, Inc.
9*7c478bd9Sstevel@tonic-gate  * All rights reserved.
10*7c478bd9Sstevel@tonic-gate  */
11*7c478bd9Sstevel@tonic-gate 
12*7c478bd9Sstevel@tonic-gate #include "config.h"
13*7c478bd9Sstevel@tonic-gate 
14*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
15*7c478bd9Sstevel@tonic-gate 
16*7c478bd9Sstevel@tonic-gate #ifndef lint
17*7c478bd9Sstevel@tonic-gate static const char sccsid[] = "@(#)hash_conv.c	10.4 (Sleepycat) 9/15/97";
18*7c478bd9Sstevel@tonic-gate static const char sccsi2[] = "%W% (Sun) %G%";
19*7c478bd9Sstevel@tonic-gate #endif /* not lint */
20*7c478bd9Sstevel@tonic-gate 
21*7c478bd9Sstevel@tonic-gate #ifndef NO_SYSTEM_INCLUDES
22*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
23*7c478bd9Sstevel@tonic-gate #endif
24*7c478bd9Sstevel@tonic-gate 
25*7c478bd9Sstevel@tonic-gate #include "db_int.h"
26*7c478bd9Sstevel@tonic-gate #include "db_page.h"
27*7c478bd9Sstevel@tonic-gate #include "db_swap.h"
28*7c478bd9Sstevel@tonic-gate #include "hash.h"
29*7c478bd9Sstevel@tonic-gate 
30*7c478bd9Sstevel@tonic-gate /*
31*7c478bd9Sstevel@tonic-gate  * __ham_pgin --
32*7c478bd9Sstevel@tonic-gate  *	Convert host-specific page layout from the host-independent format
33*7c478bd9Sstevel@tonic-gate  *	stored on disk.
34*7c478bd9Sstevel@tonic-gate  *
35*7c478bd9Sstevel@tonic-gate  * PUBLIC: int __ham_pgin __P((db_pgno_t, void *, DBT *));
36*7c478bd9Sstevel@tonic-gate  */
37*7c478bd9Sstevel@tonic-gate int
__ham_pgin(pg,pp,cookie)38*7c478bd9Sstevel@tonic-gate __ham_pgin(pg, pp, cookie)
39*7c478bd9Sstevel@tonic-gate 	db_pgno_t pg;
40*7c478bd9Sstevel@tonic-gate 	void *pp;
41*7c478bd9Sstevel@tonic-gate 	DBT *cookie;
42*7c478bd9Sstevel@tonic-gate {
43*7c478bd9Sstevel@tonic-gate 	DB_PGINFO *pginfo;
44*7c478bd9Sstevel@tonic-gate 	u_int32_t tpgno;
45*7c478bd9Sstevel@tonic-gate 
46*7c478bd9Sstevel@tonic-gate 	pginfo = (DB_PGINFO *)cookie->data;
47*7c478bd9Sstevel@tonic-gate 	tpgno = PGNO((PAGE *)pp);
48*7c478bd9Sstevel@tonic-gate 	if (pginfo->needswap)
49*7c478bd9Sstevel@tonic-gate 		M_32_SWAP(tpgno);
50*7c478bd9Sstevel@tonic-gate 
51*7c478bd9Sstevel@tonic-gate 	if (pg != PGNO_METADATA && pg != tpgno) {
52*7c478bd9Sstevel@tonic-gate 		P_INIT(pp, pginfo->db_pagesize,
53*7c478bd9Sstevel@tonic-gate 		    pg, PGNO_INVALID, PGNO_INVALID, 0, P_HASH);
54*7c478bd9Sstevel@tonic-gate 		return (0);
55*7c478bd9Sstevel@tonic-gate 	}
56*7c478bd9Sstevel@tonic-gate 
57*7c478bd9Sstevel@tonic-gate 	if (!pginfo->needswap)
58*7c478bd9Sstevel@tonic-gate 		return (0);
59*7c478bd9Sstevel@tonic-gate 	return (pg == PGNO_METADATA ?
60*7c478bd9Sstevel@tonic-gate 	    __ham_mswap(pp) : __db_pgin(pg, pginfo->db_pagesize, pp));
61*7c478bd9Sstevel@tonic-gate }
62*7c478bd9Sstevel@tonic-gate 
63*7c478bd9Sstevel@tonic-gate /*
64*7c478bd9Sstevel@tonic-gate  * __ham_pgout --
65*7c478bd9Sstevel@tonic-gate  *	Convert host-specific page layout to the host-independent format
66*7c478bd9Sstevel@tonic-gate  *	stored on disk.
67*7c478bd9Sstevel@tonic-gate  *
68*7c478bd9Sstevel@tonic-gate  * PUBLIC: int __ham_pgout __P((db_pgno_t, void *, DBT *));
69*7c478bd9Sstevel@tonic-gate  */
70*7c478bd9Sstevel@tonic-gate int
__ham_pgout(pg,pp,cookie)71*7c478bd9Sstevel@tonic-gate __ham_pgout(pg, pp, cookie)
72*7c478bd9Sstevel@tonic-gate 	db_pgno_t pg;
73*7c478bd9Sstevel@tonic-gate 	void *pp;
74*7c478bd9Sstevel@tonic-gate 	DBT *cookie;
75*7c478bd9Sstevel@tonic-gate {
76*7c478bd9Sstevel@tonic-gate 	DB_PGINFO *pginfo;
77*7c478bd9Sstevel@tonic-gate 
78*7c478bd9Sstevel@tonic-gate 	pginfo = (DB_PGINFO *)cookie->data;
79*7c478bd9Sstevel@tonic-gate 	if (!pginfo->needswap)
80*7c478bd9Sstevel@tonic-gate 		return (0);
81*7c478bd9Sstevel@tonic-gate 	return (pg == PGNO_METADATA ?
82*7c478bd9Sstevel@tonic-gate 	    __ham_mswap(pp) : __db_pgout(pg, pginfo->db_pagesize, pp));
83*7c478bd9Sstevel@tonic-gate }
84*7c478bd9Sstevel@tonic-gate 
85*7c478bd9Sstevel@tonic-gate /*
86*7c478bd9Sstevel@tonic-gate  * __ham_mswap --
87*7c478bd9Sstevel@tonic-gate  *	Swap the bytes on the hash metadata page.
88*7c478bd9Sstevel@tonic-gate  *
89*7c478bd9Sstevel@tonic-gate  * PUBLIC: int __ham_mswap __P((void *));
90*7c478bd9Sstevel@tonic-gate  */
91*7c478bd9Sstevel@tonic-gate int
__ham_mswap(pg)92*7c478bd9Sstevel@tonic-gate __ham_mswap(pg)
93*7c478bd9Sstevel@tonic-gate 	void *pg;
94*7c478bd9Sstevel@tonic-gate {
95*7c478bd9Sstevel@tonic-gate 	u_int8_t *p;
96*7c478bd9Sstevel@tonic-gate 	int i;
97*7c478bd9Sstevel@tonic-gate 
98*7c478bd9Sstevel@tonic-gate 	p = (u_int8_t *)pg;
99*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* lsn part 1 */
100*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* lsn part 2 */
101*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* pgno */
102*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* magic */
103*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* version */
104*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* pagesize */
105*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* ovfl_point */
106*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* last_freed */
107*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* max_bucket */
108*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* high_mask */
109*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* low_mask */
110*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* ffactor */
111*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* nelem */
112*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* h_charkey */
113*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* flags */
114*7c478bd9Sstevel@tonic-gate 	for (i = 0; i < NCACHED; ++i)
115*7c478bd9Sstevel@tonic-gate 		SWAP32(p);	/* spares */
116*7c478bd9Sstevel@tonic-gate 	return (0);
117*7c478bd9Sstevel@tonic-gate }
118