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      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