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 38struct _citrus_region { 39 void *r_head; 40 size_t r_size; 41}; 42 43static __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 51static __inline void * 52_citrus_region_head(const struct _citrus_region *r) 53{ 54 55 return (r->r_head); 56} 57 58static __inline size_t 59_citrus_region_size(const struct _citrus_region *r) 60{ 61 62 return (r->r_size); 63} 64 65static __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 72static __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 79static __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 86static __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 95static __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 104static __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