1 /* $FreeBSD$ */ 2 /* $NetBSD: citrus_region.h,v 1.7 2008/02/09 14:56:20 junyoung Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-2-Clause 6 * 7 * Copyright (c)2003 Citrus Project, 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 */ 32 33 #ifndef _CITRUS_REGION_H_ 34 #define _CITRUS_REGION_H_ 35 36 #include <sys/types.h> 37 38 struct _citrus_region { 39 void *r_head; 40 size_t r_size; 41 }; 42 43 static __inline void 44 _citrus_region_init(struct _citrus_region *r, void *h, size_t sz) 45 { 46 47 r->r_head = h; 48 r->r_size = sz; 49 } 50 51 static __inline void * 52 _citrus_region_head(const struct _citrus_region *r) 53 { 54 55 return (r->r_head); 56 } 57 58 static __inline size_t 59 _citrus_region_size(const struct _citrus_region *r) 60 { 61 62 return (r->r_size); 63 } 64 65 static __inline int 66 _citrus_region_check(const struct _citrus_region *r, size_t ofs, size_t sz) 67 { 68 69 return (r->r_size >= ofs + sz ? 0 : -1); 70 } 71 72 static __inline void * 73 _citrus_region_offset(const struct _citrus_region *r, size_t pos) 74 { 75 76 return ((void *)((uint8_t *)r->r_head + pos)); 77 } 78 79 static __inline uint8_t 80 _citrus_region_peek8(const struct _citrus_region *r, size_t pos) 81 { 82 83 return (*(uint8_t *)_citrus_region_offset(r, pos)); 84 } 85 86 static __inline uint16_t 87 _citrus_region_peek16(const struct _citrus_region *r, size_t pos) 88 { 89 uint16_t val; 90 91 memcpy(&val, _citrus_region_offset(r, pos), (size_t)2); 92 return (val); 93 } 94 95 static __inline uint32_t 96 _citrus_region_peek32(const struct _citrus_region *r, size_t pos) 97 { 98 uint32_t val; 99 100 memcpy(&val, _citrus_region_offset(r, pos), (size_t)4); 101 return (val); 102 } 103 104 static __inline int 105 _citrus_region_get_subregion(struct _citrus_region *subr, 106 const struct _citrus_region *r, size_t ofs, size_t sz) 107 { 108 109 if (_citrus_region_check(r, ofs, sz)) 110 return (-1); 111 _citrus_region_init(subr, _citrus_region_offset(r, ofs), sz); 112 return (0); 113 } 114 115 #endif 116