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, 1998
5*7c478bd9Sstevel@tonic-gate  *	Sleepycat Software.  All rights reserved.
6*7c478bd9Sstevel@tonic-gate  */
7*7c478bd9Sstevel@tonic-gate 
8*7c478bd9Sstevel@tonic-gate #include "config.h"
9*7c478bd9Sstevel@tonic-gate 
10*7c478bd9Sstevel@tonic-gate #ifndef lint
11*7c478bd9Sstevel@tonic-gate static const char sccsid[] = "@(#)bt_conv.c	10.7 (Sleepycat) 9/20/98";
12*7c478bd9Sstevel@tonic-gate #endif /* not lint */
13*7c478bd9Sstevel@tonic-gate 
14*7c478bd9Sstevel@tonic-gate #ifndef NO_SYSTEM_INCLUDES
15*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
16*7c478bd9Sstevel@tonic-gate #endif
17*7c478bd9Sstevel@tonic-gate 
18*7c478bd9Sstevel@tonic-gate #include "db_int.h"
19*7c478bd9Sstevel@tonic-gate #include "db_page.h"
20*7c478bd9Sstevel@tonic-gate #include "db_swap.h"
21*7c478bd9Sstevel@tonic-gate #include "btree.h"
22*7c478bd9Sstevel@tonic-gate 
23*7c478bd9Sstevel@tonic-gate /*
24*7c478bd9Sstevel@tonic-gate  * __bam_pgin --
25*7c478bd9Sstevel@tonic-gate  *	Convert host-specific page layout from the host-independent format
26*7c478bd9Sstevel@tonic-gate  *	stored on disk.
27*7c478bd9Sstevel@tonic-gate  *
28*7c478bd9Sstevel@tonic-gate  * PUBLIC: int __bam_pgin __P((db_pgno_t, void *, DBT *));
29*7c478bd9Sstevel@tonic-gate  */
30*7c478bd9Sstevel@tonic-gate int
__bam_pgin(pg,pp,cookie)31*7c478bd9Sstevel@tonic-gate __bam_pgin(pg, pp, cookie)
32*7c478bd9Sstevel@tonic-gate 	db_pgno_t pg;
33*7c478bd9Sstevel@tonic-gate 	void *pp;
34*7c478bd9Sstevel@tonic-gate 	DBT *cookie;
35*7c478bd9Sstevel@tonic-gate {
36*7c478bd9Sstevel@tonic-gate 	DB_PGINFO *pginfo;
37*7c478bd9Sstevel@tonic-gate 
38*7c478bd9Sstevel@tonic-gate 	pginfo = (DB_PGINFO *)cookie->data;
39*7c478bd9Sstevel@tonic-gate 	if (!pginfo->needswap)
40*7c478bd9Sstevel@tonic-gate 		return (0);
41*7c478bd9Sstevel@tonic-gate 	return (pg == PGNO_METADATA ?
42*7c478bd9Sstevel@tonic-gate 	    __bam_mswap(pp) : __db_pgin(pg, pginfo->db_pagesize, pp));
43*7c478bd9Sstevel@tonic-gate }
44*7c478bd9Sstevel@tonic-gate 
45*7c478bd9Sstevel@tonic-gate /*
46*7c478bd9Sstevel@tonic-gate  * __bam_pgout --
47*7c478bd9Sstevel@tonic-gate  *	Convert host-specific page layout to the host-independent format
48*7c478bd9Sstevel@tonic-gate  *	stored on disk.
49*7c478bd9Sstevel@tonic-gate  *
50*7c478bd9Sstevel@tonic-gate  * PUBLIC: int __bam_pgout __P((db_pgno_t, void *, DBT *));
51*7c478bd9Sstevel@tonic-gate  */
52*7c478bd9Sstevel@tonic-gate int
__bam_pgout(pg,pp,cookie)53*7c478bd9Sstevel@tonic-gate __bam_pgout(pg, pp, cookie)
54*7c478bd9Sstevel@tonic-gate 	db_pgno_t pg;
55*7c478bd9Sstevel@tonic-gate 	void *pp;
56*7c478bd9Sstevel@tonic-gate 	DBT *cookie;
57*7c478bd9Sstevel@tonic-gate {
58*7c478bd9Sstevel@tonic-gate 	DB_PGINFO *pginfo;
59*7c478bd9Sstevel@tonic-gate 
60*7c478bd9Sstevel@tonic-gate 	pginfo = (DB_PGINFO *)cookie->data;
61*7c478bd9Sstevel@tonic-gate 	if (!pginfo->needswap)
62*7c478bd9Sstevel@tonic-gate 		return (0);
63*7c478bd9Sstevel@tonic-gate 	return (pg == PGNO_METADATA ?
64*7c478bd9Sstevel@tonic-gate 	    __bam_mswap(pp) : __db_pgout(pg, pginfo->db_pagesize, pp));
65*7c478bd9Sstevel@tonic-gate }
66*7c478bd9Sstevel@tonic-gate 
67*7c478bd9Sstevel@tonic-gate /*
68*7c478bd9Sstevel@tonic-gate  * __bam_mswap --
69*7c478bd9Sstevel@tonic-gate  *	Swap the bytes on the btree metadata page.
70*7c478bd9Sstevel@tonic-gate  *
71*7c478bd9Sstevel@tonic-gate  * PUBLIC: int __bam_mswap __P((PAGE *));
72*7c478bd9Sstevel@tonic-gate  */
73*7c478bd9Sstevel@tonic-gate int
__bam_mswap(pg)74*7c478bd9Sstevel@tonic-gate __bam_mswap(pg)
75*7c478bd9Sstevel@tonic-gate 	PAGE *pg;
76*7c478bd9Sstevel@tonic-gate {
77*7c478bd9Sstevel@tonic-gate 	u_int8_t *p;
78*7c478bd9Sstevel@tonic-gate 
79*7c478bd9Sstevel@tonic-gate 	p = (u_int8_t *)pg;
80*7c478bd9Sstevel@tonic-gate 
81*7c478bd9Sstevel@tonic-gate 	/* Swap the meta-data information. */
82*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* lsn.file */
83*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* lsn.offset */
84*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* pgno */
85*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* magic */
86*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* version */
87*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* pagesize */
88*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* maxkey */
89*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* minkey */
90*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* free */
91*7c478bd9Sstevel@tonic-gate 	SWAP32(p);		/* flags */
92*7c478bd9Sstevel@tonic-gate 
93*7c478bd9Sstevel@tonic-gate 	return (0);
94*7c478bd9Sstevel@tonic-gate }
95