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 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 * 50 _citrus_region_head(const struct _citrus_region *r) 51 { 52 53 return (r->r_head); 54 } 55 56 static __inline size_t 57 _citrus_region_size(const struct _citrus_region *r) 58 { 59 60 return (r->r_size); 61 } 62 63 static __inline int 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 * 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 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 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 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 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