src/endian.h

   1 ///
   2 /// \file       endian.h
   3 ///             Endian conversion macros
   4 ///
   5
   6 /*
   7     Copyright (C) 2006-2008, Net Direct Inc. (http://www.netdirect.ca/)
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17
  18     See the GNU General Public License in the COPYING file at the
  19     root directory of this project for more details.
  20 */
  21
  22 #ifndef __BARRY_ENDIAN_H__
  23 #define __BARRY_ENDIAN_H__
  24
  25 // The Blackberry is little endian in its USB data.  Fortunately,
  26 // this makes conversion easy on the x86...
  27 #include "config.h"
  28
  29 #ifndef WORDS_BIGENDIAN
  30 #define btohs(x) x                      // for uint16_t
  31 #define btohl(x) x                      // for uint32_t
  32 #define btohll(x) x                     // for uint64_t
  33 #define htobs(x) x                      // for uint16_t
  34 #define htobl(x) x                      // for uint32_t
  35 #define htobll(x) x                     // for uint64_t
  36 #else
  37
  38 //#include <byteswap.h>
  39
  40 // The following is a byteswap.h replacement, for systems like Mac OS X.
  41 // It was taken from a patch to the GPL software cowpatty, patch
  42 // by user gm2net.
  43 // http://www.netstumbler.org/showpost.php?s=79764fd1526e4653d5cb4432225da6ee&p=190494&postcount=29
  44
  45 //#warning "byteswap.h is an unportable GNU extension!  Don't use!"
  46
  47 static inline unsigned short bswap_16(unsigned short x) {
  48   return (x>>8) | (x<<8);
  49 }
  50
  51 static inline unsigned int bswap_32(unsigned int x) {
  52   return (bswap_16(x&0xffff)<<16) | (bswap_16(x>>16));
  53 }
  54
  55 static inline unsigned long long bswap_64(unsigned long long x) {
  56   return (((unsigned long long)bswap_32(x&0xffffffffull))<<32) | (bswap_32(x>>32));
  57 }
  58
  59 #define btohs(x) bswap_16(x)            // for uint16_t
  60 #define btohl(x) bswap_32(x)            // for uint32_t
  61 #define btohll(x) bswap_64(x)           // for uint64_t
  62 #define htobs(x) bswap_16(x)            // for uint16_t
  63 #define htobl(x) bswap_32(x)            // for uint32_t
  64 #define htobll(x) bswap_64(x)           // for uint64_t
  65 #endif
  66
  67 #endif
  68