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
_citrus_region_init(struct _citrus_region * r,void * h,size_t sz)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 *
_citrus_region_head(const struct _citrus_region * r)51 _citrus_region_head(const struct _citrus_region *r)
52 {
53
54 return (r->r_head);
55 }
56
57 static __inline size_t
_citrus_region_size(const struct _citrus_region * r)58 _citrus_region_size(const struct _citrus_region *r)
59 {
60
61 return (r->r_size);
62 }
63
64 static __inline int
_citrus_region_check(const struct _citrus_region * r,size_t ofs,size_t sz)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 *
_citrus_region_offset(const struct _citrus_region * r,size_t pos)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
_citrus_region_peek8(const struct _citrus_region * r,size_t pos)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
_citrus_region_peek16(const struct _citrus_region * r,size_t pos)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
_citrus_region_peek32(const struct _citrus_region * r,size_t pos)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
_citrus_region_get_subregion(struct _citrus_region * subr,const struct _citrus_region * r,size_t ofs,size_t sz)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