contrib/libarchive-2/libarchive/archive_endian.h

   1 /*-
   2  * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/libarchive/archive_endian.h,v 1.2 2008/02/26 07:17:47 kientzle Exp $
  27  *
  28  * Borrowed from FreeBSD's <sys/endian.h>
  29  */
  30
  31 #ifndef ARCHIVE_ENDIAN_H_INCLUDED
  32 #define ARCHIVE_ENDIAN_H_INCLUDED
  33
  34 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
  35
  36 static inline uint16_t
  37 archive_be16dec(const void *pp)
  38 {
  39         unsigned char const *p = (unsigned char const *)pp;
  40
  41         return ((p[0] << 8) | p[1]);
  42 }
  43
  44 static inline uint32_t
  45 archive_be32dec(const void *pp)
  46 {
  47         unsigned char const *p = (unsigned char const *)pp;
  48
  49         return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
  50 }
  51
  52 static inline uint64_t
  53 archive_be64dec(const void *pp)
  54 {
  55         unsigned char const *p = (unsigned char const *)pp;
  56
  57         return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
  58 }
  59
  60 static inline uint16_t
  61 archive_le16dec(const void *pp)
  62 {
  63         unsigned char const *p = (unsigned char const *)pp;
  64
  65         return ((p[1] << 8) | p[0]);
  66 }
  67
  68 static inline uint32_t
  69 archive_le32dec(const void *pp)
  70 {
  71         unsigned char const *p = (unsigned char const *)pp;
  72
  73         return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
  74 }
  75
  76 static inline uint64_t
  77 archive_le64dec(const void *pp)
  78 {
  79         unsigned char const *p = (unsigned char const *)pp;
  80
  81         return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
  82 }
  83
  84 static inline void
  85 archive_be16enc(void *pp, uint16_t u)
  86 {
  87         unsigned char *p = (unsigned char *)pp;
  88
  89         p[0] = (u >> 8) & 0xff;
  90         p[1] = u & 0xff;
  91 }
  92
  93 static inline void
  94 archive_be32enc(void *pp, uint32_t u)
  95 {
  96         unsigned char *p = (unsigned char *)pp;
  97
  98         p[0] = (u >> 24) & 0xff;
  99         p[1] = (u >> 16) & 0xff;
 100         p[2] = (u >> 8) & 0xff;
 101         p[3] = u & 0xff;
 102 }
 103
 104 static inline void
 105 archive_be64enc(void *pp, uint64_t u)
 106 {
 107         unsigned char *p = (unsigned char *)pp;
 108
 109         archive_be32enc(p, u >> 32);
 110         archive_be32enc(p + 4, u & 0xffffffff);
 111 }
 112
 113 static inline void
 114 archive_le16enc(void *pp, uint16_t u)
 115 {
 116         unsigned char *p = (unsigned char *)pp;
 117
 118         p[0] = u & 0xff;
 119         p[1] = (u >> 8) & 0xff;
 120 }
 121
 122 static inline void
 123 archive_le32enc(void *pp, uint32_t u)
 124 {
 125         unsigned char *p = (unsigned char *)pp;
 126
 127         p[0] = u & 0xff;
 128         p[1] = (u >> 8) & 0xff;
 129         p[2] = (u >> 16) & 0xff;
 130         p[3] = (u >> 24) & 0xff;
 131 }
 132
 133 static inline void
 134 archive_le64enc(void *pp, uint64_t u)
 135 {
 136         unsigned char *p = (unsigned char *)pp;
 137
 138         archive_le32enc(p, u & 0xffffffff);
 139         archive_le32enc(p + 4, u >> 32);
 140 }
 141
 142 #endif