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