xref: /freebsd/lib/libc/iconv/citrus_region.h (revision a03411e84728e9b267056fd31c7d1d9d1dc1b01e)
1 /* $NetBSD: citrus_region.h,v 1.7 2008/02/09 14:56:20 junyoung Exp $ */
2 
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause
5  *
6  * Copyright (c)2003 Citrus Project,
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  */
31 
32 #ifndef _CITRUS_REGION_H_
33 #define _CITRUS_REGION_H_
34 
35 #include <sys/types.h>
36 
37 struct _citrus_region {
38 	void	*r_head;
39 	size_t	 r_size;
40 };
41 
42 static __inline void
43 _citrus_region_init(struct _citrus_region *r, void *h, size_t sz)
44 {
45 
46 	r->r_head = h;
47 	r->r_size = sz;
48 }
49 
50 static __inline void *
51 _citrus_region_head(const struct _citrus_region *r)
52 {
53 
54 	return (r->r_head);
55 }
56 
57 static __inline size_t
58 _citrus_region_size(const struct _citrus_region *r)
59 {
60 
61 	return (r->r_size);
62 }
63 
64 static __inline int
65 _citrus_region_check(const struct _citrus_region *r, size_t ofs, size_t sz)
66 {
67 
68 	return (r->r_size >= ofs + sz ? 0 : -1);
69 }
70 
71 static __inline void *
72 _citrus_region_offset(const struct _citrus_region *r, size_t pos)
73 {
74 
75 	return ((void *)((uint8_t *)r->r_head + pos));
76 }
77 
78 static __inline uint8_t
79 _citrus_region_peek8(const struct _citrus_region *r, size_t pos)
80 {
81 
82 	return (*(uint8_t *)_citrus_region_offset(r, pos));
83 }
84 
85 static __inline uint16_t
86 _citrus_region_peek16(const struct _citrus_region *r, size_t pos)
87 {
88 	uint16_t val;
89 
90 	memcpy(&val, _citrus_region_offset(r, pos), (size_t)2);
91 	return (val);
92 }
93 
94 static __inline uint32_t
95 _citrus_region_peek32(const struct _citrus_region *r, size_t pos)
96 {
97 	uint32_t val;
98 
99 	memcpy(&val, _citrus_region_offset(r, pos), (size_t)4);
100 	return (val);
101 }
102 
103 static __inline int
104 _citrus_region_get_subregion(struct _citrus_region *subr,
105     const struct _citrus_region *r, size_t ofs, size_t sz)
106 {
107 
108 	if (_citrus_region_check(r, ofs, sz))
109 		return (-1);
110 	_citrus_region_init(subr, _citrus_region_offset(r, ofs), sz);
111 	return (0);
112 }
113 
114 #endif
115