lib/libc/citrus/citrus_region.h

   1 /* $NetBSD: citrus_region.h,v 1.7 2008/02/09 14:56:20 junyoung Exp $ */
   2 /* $DragonFly: src/lib/libc/citrus/citrus_region.h,v 1.3 2008/04/10 10:21:01 hasso 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