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