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endianness.h

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00001 /*******************************************************************************
00002  *
00003  * Copyright (c) 2008-2010 Michael Schulze <mschulze@ivs.cs.uni-magdeburg.de>
00004  * All rights reserved.
00005  *
00006  *    Redistribution and use in source and binary forms, with or without
00007  *    modification, are permitted provided that the following conditions
00008  *    are met:
00009  *
00010  *    * Redistributions of source code must retain the above copyright
00011  *      notice, this list of conditions and the following disclaimer.
00012  *
00013  *    * Redistributions in binary form must reproduce the above copyright
00014  *      notice, this list of conditions and the following disclaimer in
00015  *      the documentation and/or other materials provided with the
00016  *      distribution.
00017  *
00018  *    * Neither the name of the copyright holders nor the names of
00019  *      contributors may be used to endorse or promote products derived
00020  *      from this software without specific prior written permission.
00021  *
00022  *
00023  *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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00036  * $Id$
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00038  ******************************************************************************/
00039 
00040 #ifndef __endianness_h__
00041 #define __endianness_h__
00042 
00043 #include "util/swap_endianness.h"
00044 
00045 #if defined(LINUX)
00046 #include <arpa/inet.h>
00047 #if __BYTE_ORDER == __BIG_ENDIAN
00048 // The host byte order is the same as network byte order,
00049 // so these functions are all just identity.
00050 # define htonll(x)  (x)
00051 # define ntohll(x)  (x)
00052 #else
00053 #if __BYTE_ORDER == __LITTLE_ENDIAN
00054 #define htonll(x)    __swap_endianness_64(x)
00055 #define ntohll(x)    __swap_endianness_64(x)
00056 #else
00057 #error "BYTE_ORDER is not defined"
00058 #endif
00059 #endif
00060 
00061 
00062 #elif defined(WIN32) || defined(AVR)
00063 // Windows and AVR are both little endian
00064 #if defined(WIN32)
00065 #include <winsock2.h>
00066 #endif
00067 
00068 #if defined(AVR)
00069 #define ntohl(x) __swap_endianness_32(x)
00070 #define ntohs(x) __swap_endianness_16(x)
00071 #define htonl(x) __swap_endianness_32(x)
00072 #define htons(x) __swap_endianness_16(x)
00073 #endif
00074 
00075 #define htonll(x)    __swap_endianness_64(x)
00076 #define ntohll(x)    __swap_endianness_64(x)
00077 
00078 #else
00079 #error "It seems to be compiling for an unsupported platform and it needs to be defined the endianness of that system."
00080 #endif
00081 
00082 #endif