1 /* $FreeBSD: head/lib/libc/iconv/citrus_region.h 219019 2011-02-25 00:04:39Z gabor $ */
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
36 struct _citrus_region {
37 void *r_head;
38 size_t r_size;
39 };
40
41 static __inline void
_citrus_region_init(struct _citrus_region * r,void * h,size_t sz)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
49 static __inline void *
_citrus_region_head(const struct _citrus_region * r)50 _citrus_region_head(const struct _citrus_region *r)
51 {
52
53 return (r->r_head);
54 }
55
56 static __inline size_t
_citrus_region_size(const struct _citrus_region * r)57 _citrus_region_size(const struct _citrus_region *r)
58 {
59
60 return (r->r_size);
61 }
62
63 static __inline int
_citrus_region_check(const struct _citrus_region * r,size_t ofs,size_t sz)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
70 static __inline void *
_citrus_region_offset(const struct _citrus_region * r,size_t pos)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
77 static __inline uint8_t
_citrus_region_peek8(const struct _citrus_region * r,size_t pos)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
84 static __inline uint16_t
_citrus_region_peek16(const struct _citrus_region * r,size_t pos)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
93 static __inline uint32_t
_citrus_region_peek32(const struct _citrus_region * r,size_t pos)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
102 static __inline int
_citrus_region_get_subregion(struct _citrus_region * subr,const struct _citrus_region * r,size_t ofs,size_t sz)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