lib/libc/citrus/citrus_region.h

   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