1/* $FreeBSD$ */
2/* $NetBSD: citrus_region.h,v 1.7 2008/02/09 14:56:20 junyoung Exp $ */
3
4/*-
5 * Copyright (c)2003 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#ifndef _CITRUS_REGION_H_
32#define _CITRUS_REGION_H_
33
34#include <sys/types.h>
35
36struct _citrus_region {
37	void	*r_head;
38	size_t	 r_size;
39};
40
41static __inline void
42_citrus_region_init(struct _citrus_region *r, void *h, size_t sz)
43{
44
45	r->r_head = h;
46	r->r_size = sz;
47}
48
49static __inline void *
50_citrus_region_head(const struct _citrus_region *r)
51{
52
53	return (r->r_head);
54}
55
56static __inline size_t
57_citrus_region_size(const struct _citrus_region *r)
58{
59
60	return (r->r_size);
61}
62
63static __inline int
64_citrus_region_check(const struct _citrus_region *r, size_t ofs, size_t sz)
65{
66
67	return (r->r_size >= ofs + sz ? 0 : -1);
68}
69
70static __inline void *
71_citrus_region_offset(const struct _citrus_region *r, size_t pos)
72{
73
74	return ((void *)((uint8_t *)r->r_head + pos));
75}
76
77static __inline uint8_t
78_citrus_region_peek8(const struct _citrus_region *r, size_t pos)
79{
80
81	return (*(uint8_t *)_citrus_region_offset(r, pos));
82}
83
84static __inline uint16_t
85_citrus_region_peek16(const struct _citrus_region *r, size_t pos)
86{
87	uint16_t val;
88
89	memcpy(&val, _citrus_region_offset(r, pos), (size_t)2);
90	return (val);
91}
92
93static __inline uint32_t
94_citrus_region_peek32(const struct _citrus_region *r, size_t pos)
95{
96	uint32_t val;
97
98	memcpy(&val, _citrus_region_offset(r, pos), (size_t)4);
99	return (val);
100}
101
102static __inline int
103_citrus_region_get_subregion(struct _citrus_region *subr,
104    const struct _citrus_region *r, size_t ofs, size_t sz)
105{
106
107	if (_citrus_region_check(r, ofs, sz))
108		return (-1);
109	_citrus_region_init(subr, _citrus_region_offset(r, ofs), sz);
110	return (0);
111}
112
113#endif
114