libdb-sys 0.1.1

statically linked ffi bindings for Berkeley DB
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2010, 2012 Oracle and/or its affiliates.  All rights reserved.
 */

#include "db_config.h"

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/db_swap.h"
#include "dbinc/heap.h"

/*
 * __heap_pgin --
 *	Convert host-specific page layout from the host-independent format
 *	stored on disk.
 *
 * PUBLIC: int __heap_pgin __P((DB *, db_pgno_t, void *, DBT *));
 */
int
__heap_pgin(dbp, pg, pp, cookie)
	DB *dbp;
	db_pgno_t pg;
	void *pp;
	DBT *cookie;
{
	DB_PGINFO *pginfo;
	PAGE *h;

	pginfo = (DB_PGINFO *)cookie->data;
	if (!F_ISSET(pginfo, DB_AM_SWAP))
		return (0);

	h = pp;
	return (TYPE(h) == P_HEAPMETA ? __heap_mswap(dbp->env, pp) :
	    __db_byteswap(dbp, pg, pp, pginfo->db_pagesize, 1));
}

/*
 * __heap_pgout --
 *	Convert host-specific page layout from the host-independent format
 *	stored on disk.
 *
 * PUBLIC: int __heap_pgout __P((DB *, db_pgno_t, void *, DBT *));
 */
int
__heap_pgout(dbp, pg, pp, cookie)
	DB *dbp;
	db_pgno_t pg;
	void *pp;
	DBT *cookie;
{
	DB_PGINFO *pginfo;
	PAGE *h;

	pginfo = (DB_PGINFO *)cookie->data;
	if (!F_ISSET(pginfo, DB_AM_SWAP))
		return (0);

	h = pp;
	return (TYPE(h) == P_HEAPMETA ?  __heap_mswap(dbp->env, pp) :
	    __db_byteswap(dbp, pg, pp, pginfo->db_pagesize, 0));
}

/*
 * __heap_mswap --
 *	Swap the bytes on the heap metadata page.
 *
 * PUBLIC: int __heap_mswap __P((ENV *, PAGE *));
 */
int
__heap_mswap(env, pg)
	ENV *env;
	PAGE *pg;
{
	u_int8_t *p;

	COMPQUIET(env, NULL);

	__db_metaswap(pg);
	p = (u_int8_t *)pg + sizeof(DBMETA);

	SWAP32(p);		/* curregion */
	SWAP32(p);		/* nregions */
	SWAP32(p);		/* gbytes */
	SWAP32(p);		/* bytes */
	SWAP32(p);		/* region_size */
	p += 92 * sizeof(u_int32_t); /* unused */
	SWAP32(p);		/* crypto_magic */

	return (0);
}