boost/detail/endian.hpp
// Copyright 2005 Caleb Epstein // Copyright 2006 John Maddock // Copyright 2010 Rene Rivera // Distributed under the Boost Software License, Version 1.0. (See accompany- // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) /* * Copyright (c) 1997 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /* * Copyright notice reproduced from <boost/detail/limits.hpp>, from * which this code was originally taken. * * Modified by Caleb Epstein to use <endian.h> with GNU libc and to * defined the BOOST_ENDIAN macro. */ #ifndef BOOST_DETAIL_ENDIAN_HPP #define BOOST_DETAIL_ENDIAN_HPP // GNU libc offers the helpful header <endian.h> which defines // __BYTE_ORDER #if defined (__GLIBC__) # include <endian.h> # if (__BYTE_ORDER == __LITTLE_ENDIAN) # define BOOST_LITTLE_ENDIAN # elif (__BYTE_ORDER == __BIG_ENDIAN) # define BOOST_BIG_ENDIAN # elif (__BYTE_ORDER == __PDP_ENDIAN) # define BOOST_PDP_ENDIAN # else # error Unknown machine endianness detected. # endif # define BOOST_BYTE_ORDER __BYTE_ORDER #elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) || \ defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__) # define BOOST_BIG_ENDIAN # define BOOST_BYTE_ORDER 4321 #elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) || \ defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__) # define BOOST_LITTLE_ENDIAN # define BOOST_BYTE_ORDER 1234 #elif defined(__sparc) || defined(__sparc__) \ || defined(_POWER) || defined(__powerpc__) \ || defined(__ppc__) || defined(__hpux) || defined(__hppa) \ || defined(_MIPSEB) || defined(_POWER) \ || defined(__s390__) # define BOOST_BIG_ENDIAN # define BOOST_BYTE_ORDER 4321 #elif defined(__i386__) || defined(__alpha__) \ || defined(__ia64) || defined(__ia64__) \ || defined(_M_IX86) || defined(_M_IA64) \ || defined(_M_ALPHA) || defined(__amd64) \ || defined(__amd64__) || defined(_M_AMD64) \ || defined(__x86_64) || defined(__x86_64__) \ || defined(_M_X64) || defined(__bfin__) # define BOOST_LITTLE_ENDIAN # define BOOST_BYTE_ORDER 1234 #else # error The file boost/detail/endian.hpp needs to be set up for your CPU type. #endif #endif