1 /* $NetBSD: citrus_region.h,v 1.6 2005/05/14 17:55:42 tshiozak Exp $ */ 2 /* $DragonFly: src/lib/libc/citrus/citrus_region.h,v 1.2 2005/07/04 10:11:57 joerg 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 struct _citrus_region { 35 /* private: */ 36 void *r_head; 37 size_t r_size; 38 }; 39 40 static __inline void 41 _citrus_region_init(struct _citrus_region *r, void *h, size_t sz) 42 { 43 _DIAGASSERT(r); 44 r->r_head = h; 45 r->r_size = sz; 46 } 47 48 static __inline void * 49 _citrus_region_head(const struct _citrus_region *r) 50 { 51 return r->r_head; 52 } 53 54 static __inline size_t 55 _citrus_region_size(const struct _citrus_region *r) 56 { 57 return r->r_size; 58 } 59 60 static __inline int 61 _citrus_region_check(const struct _citrus_region *r, size_t ofs, size_t sz) 62 { 63 return r->r_size >= ofs + sz ? 0 : -1; 64 } 65 66 static __inline void * 67 _citrus_region_offset(const struct _citrus_region *r, size_t pos) 68 { 69 return (void *)((uint8_t *)r->r_head + pos); 70 } 71 72 static __inline uint8_t 73 _citrus_region_peek8(const struct _citrus_region *r, size_t pos) 74 { 75 return *(uint8_t *)_citrus_region_offset(r, pos); 76 } 77 78 static __inline uint16_t 79 _citrus_region_peek16(const struct _citrus_region *r, size_t pos) 80 { 81 uint16_t val; 82 memcpy(&val, _citrus_region_offset(r, pos), 2); 83 return val; 84 } 85 86 static __inline uint32_t 87 _citrus_region_peek32(const struct _citrus_region *r, size_t pos) 88 { 89 uint32_t val; 90 memcpy(&val, _citrus_region_offset(r, pos), 4); 91 return val; 92 } 93 94 static __inline int 95 _citrus_region_get_subregion(struct _citrus_region *subr, 96 const struct _citrus_region *r, 97 size_t ofs, size_t sz) 98 { 99 if (_citrus_region_check(r, ofs, sz)) 100 return -1; 101 _citrus_region_init(subr, _citrus_region_offset(r, ofs), sz); 102 return 0; 103 } 104 105 #endif 106