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citrus_region.h revision 1.2 
      1 /*	$NetBSD: citrus_region.h,v 1.2 2003/06/29 17:30:07 tshiozak 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 struct _citrus_region {
     34 /* private: */
     35 	void	*r_head;
     36 	size_t	r_size;
     37 };
     38 
     39 static __inline void
     40 _citrus_region_init(struct _citrus_region *r, void *h, size_t sz)
     41 {
     42 	_DIAGASSERT(r);
     43 	r->r_head = h;
     44 	r->r_size = sz;
     45 }
     46 
     47 static __inline void *
     48 _citrus_region_head(const struct _citrus_region *r)
     49 {
     50 	return r->r_head;
     51 }
     52 
     53 static __inline size_t
     54 _citrus_region_size(const struct _citrus_region *r)
     55 {
     56 	return r->r_size;
     57 }
     58 
     59 static __inline int
     60 _citrus_region_check(const struct _citrus_region *r, size_t ofs, size_t sz)
     61 {
     62 	return r->r_size >= ofs + sz ? 0 : -1;
     63 }
     64 
     65 static __inline void *
     66 _citrus_region_offset(const struct _citrus_region *r, size_t pos)
     67 {
     68 	return (void *)((u_int8_t *)r->r_head + pos);
     69 }
     70 
     71 static __inline u_int8_t
     72 _citrus_region_peek8(const struct _citrus_region *r, size_t pos)
     73 {
     74 	return *(u_int8_t *)_citrus_region_offset(r, pos);
     75 }
     76 
     77 static __inline u_int16_t
     78 _citrus_region_peek16(const struct _citrus_region *r, size_t pos)
     79 {
     80 	u_int16_t val;
     81 	memcpy(&val, _citrus_region_offset(r, pos), 2);
     82 	return val;
     83 }
     84 
     85 static __inline u_int32_t
     86 _citrus_region_peek32(const struct _citrus_region *r, size_t pos)
     87 {
     88 	u_int32_t val;
     89 	memcpy(&val, _citrus_region_offset(r, pos), 4);
     90 	return val;
     91 }
     92 
     93 #endif
     94