endianlove.h

   1 /*
   2  *  endianlove.h
   3  *  openc2e
   4  *
   5  *  Created by Alyssa Milburn on Sat May 22 2004.
   6  *  Copyright (c) 2004 Alyssa Milburn. All rights reserved.
   7  *
   8  *  This library is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU Lesser General Public
  10  *  License as published by the Free Software Foundation; either
  11  *  version 2 of the License, or (at your option) any later version.
  12  *
  13  *  This library is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  Lesser General Public License for more details.
  17  *
  18  */
  19
  20 #ifndef _ENDIANLOVE_H
  21 #define _ENDIANLOVE_H
  22
  23 #include <stdlib.h> // load the standard libraries for these defines
  24
  25 #if HAVE_STDINT_H
  26
  27 #include <stdint.h>
  28
  29 typedef uint8_t uint8;
  30 typedef uint16_t uint16;
  31 typedef uint32_t uint32;
  32
  33 #else
  34
  35 typedef unsigned char uint8;
  36 typedef unsigned short uint16;
  37 typedef unsigned int uint32;
  38
  39 #endif
  40
  41 #ifndef OC2E_BIG_ENDIAN
  42 #       ifdef __GNU__
  43 #               include <endian.h>
  44 #               if __BYTE_ORDER == __LITTLE_ENDIAN
  45 #                       define OC2E_BIG_ENDIAN 0
  46 #               else
  47 #                       define OC2E_BIG_ENDIAN 1
  48 #               endif
  49 #       else
  50 #               if defined(_MSC_VER) || defined(__i386__)
  51 #                       define OC2E_BIG_ENDIAN 0
  52 #               else
  53 #                       define OC2E_BIG_ENDIAN 1
  54 #               endif
  55 #       endif
  56 #endif
  57
  58 #if OC2E_BIG_ENDIAN
  59
  60 # if HAVE_BYTESWAP_H
  61
  62 #include <byteswap.h>
  63 static inline uint16 swapEndianShort(uint16 a) {
  64         return bswap_16(a);
  65 }
  66
  67 static inline uint32 swapEndianLong(uint32 a) {
  68         return bswap_32(a);
  69 }
  70
  71 # else // HAVE_BYTESWAP_H
  72
  73 static inline uint16 swapEndianShort(uint16 a) {
  74         return ((((uint16)(a) & 0xff00) >> 8) |
  75                                    (((uint16)(a) & 0x00ff) << 8));
  76 }
  77
  78 static inline uint32 swapEndianLong(uint32 a) {
  79         return ((((uint32)(a) & 0xff000000) >> 24) |
  80                                    (((uint32)(a) & 0x00ff0000) >> 8)  |
  81                                    (((uint32)(a) & 0x0000ff00) << 8)  |
  82                                    (((uint32)(a) & 0x000000ff) << 24));
  83 }
  84
  85 # endif
  86
  87 #else // OC2E_BIG_ENDIAN
  88
  89 static inline uint16 swapEndianShort(uint16 a) {
  90         return a;
  91 }
  92
  93 static inline uint32 swapEndianLong(uint32 a) {
  94         return a;
  95 }
  96
  97 #endif
  98
  99 #endif // _ENDIANLOVE_H
 100
 101 /* vim: set noet: */