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 /* Note:  This is a purely internal header! */
  32 /* Do not use this outside of libarchive internal code! */
  33
  34 #ifndef ARCHIVE_ENDIAN_H_INCLUDED
  35 #define ARCHIVE_ENDIAN_H_INCLUDED
  36
  37
  38 /* Watcom C++ doesn't support 'inline' in C code.  (For any version?) */
  39 #if defined( __WATCOMC__ )
  40         #define inline
  41 #endif
  42
  43 /* Visual C++ 6.0 doesn't support 'inline' in C code.  (Does VC7? VC8?) */
  44 #if defined(_MSC_VER)
  45         #define inline
  46 #endif
  47
  48 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
  49
  50 static inline uint16_t
  51 archive_be16dec(const void *pp)
  52 {
  53         unsigned char const *p = (unsigned char const *)pp;
  54
  55         return ((p[0] << 8) | p[1]);
  56 }
  57
  58 static inline uint32_t
  59 archive_be32dec(const void *pp)
  60 {
  61         unsigned char const *p = (unsigned char const *)pp;
  62
  63         return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
  64 }
  65
  66 static inline uint64_t
  67 archive_be64dec(const void *pp)
  68 {
  69         unsigned char const *p = (unsigned char const *)pp;
  70
  71         return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));
  72 }
  73
  74 static inline uint16_t
  75 archive_le16dec(const void *pp)
  76 {
  77         unsigned char const *p = (unsigned char const *)pp;
  78
  79         return ((p[1] << 8) | p[0]);
  80 }
  81
  82 static inline uint32_t
  83 archive_le32dec(const void *pp)
  84 {
  85         unsigned char const *p = (unsigned char const *)pp;
  86
  87         return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
  88 }
  89
  90 static inline uint64_t
  91 archive_le64dec(const void *pp)
  92 {
  93         unsigned char const *p = (unsigned char const *)pp;
  94
  95         return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));
  96 }
  97
  98 static inline void
  99 archive_be16enc(void *pp, uint16_t u)
 100 {
 101         unsigned char *p = (unsigned char *)pp;
 102
 103         p[0] = (u >> 8) & 0xff;
 104         p[1] = u & 0xff;
 105 }
 106
 107 static inline void
 108 archive_be32enc(void *pp, uint32_t u)
 109 {
 110         unsigned char *p = (unsigned char *)pp;
 111
 112         p[0] = (u >> 24) & 0xff;
 113         p[1] = (u >> 16) & 0xff;
 114         p[2] = (u >> 8) & 0xff;
 115         p[3] = u & 0xff;
 116 }
 117
 118 static inline void
 119 archive_be64enc(void *pp, uint64_t u)
 120 {
 121         unsigned char *p = (unsigned char *)pp;
 122
 123         archive_be32enc(p, u >> 32);
 124         archive_be32enc(p + 4, u & 0xffffffff);
 125 }
 126
 127 static inline void
 128 archive_le16enc(void *pp, uint16_t u)
 129 {
 130         unsigned char *p = (unsigned char *)pp;
 131
 132         p[0] = u & 0xff;
 133         p[1] = (u >> 8) & 0xff;
 134 }
 135
 136 static inline void
 137 archive_le32enc(void *pp, uint32_t u)
 138 {
 139         unsigned char *p = (unsigned char *)pp;
 140
 141         p[0] = u & 0xff;
 142         p[1] = (u >> 8) & 0xff;
 143         p[2] = (u >> 16) & 0xff;
 144         p[3] = (u >> 24) & 0xff;
 145 }
 146
 147 static inline void
 148 archive_le64enc(void *pp, uint64_t u)
 149 {
 150         unsigned char *p = (unsigned char *)pp;
 151
 152         archive_le32enc(p, u & 0xffffffff);
 153         archive_le32enc(p + 4, u >> 32);
 154 }
 155
 156 #endif