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/******************************************************************************
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* Project: libLAS - http://liblas.org - A BSD library for LAS format data.
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* Purpose: Endian macros
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* Author: Mateusz Loskot, mateusz@loskot.net
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* This file has been stolen from <boost/endian.hpp> and
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* modified for libLAS purposes.
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* (C) Copyright Mateusz Loskot 2007, mateusz@loskot.net
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* (C) Copyright Caleb Epstein 2005
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* (C) Copyright John Maddock 2006
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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* 06 Feb 2006 - Initial Revision
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* 09 Nov 2006 - fixed variant and version bits for v4 guids
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* 13 Nov 2006 - added serialization
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* 17 Nov 2006 - added name-based guid creation
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* 20 Nov 2006 - add fixes for gcc (from Tim Blechmann)
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* 07 Mar 2007 - converted to header only
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* 20 Jan 2008 - removed dependency of Boost and modified for libLAS (by Mateusz Loskot)
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******************************************************************************
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* Silicon Graphics Computer Systems, Inc.
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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* Copyright notice reproduced from <boost/detail/limits.hpp>, from
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* which this code was originally taken.
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* Modified by Caleb Epstein to use <endian.h> with GNU libc and to
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* defined the BOOST_ENDIAN macro.
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****************************************************************************/
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#ifndef LIBLAS_DETAIL_ENDIAN_HPP_INCLUDED
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#define LIBLAS_DETAIL_ENDIAN_HPP_INCLUDED
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// GNU libc offers the helpful header <endian.h> which defines
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#if defined (__GLIBC__)
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# if (__BYTE_ORDER == __LITTLE_ENDIAN)
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# define LIBLAS_LITTLE_ENDIAN
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# elif (__BYTE_ORDER == __BIG_ENDIAN)
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# define LIBLAS_BIG_ENDIAN
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# elif (__BYTE_ORDER == __PDP_ENDIAN)
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# define LIBLAS_PDP_ENDIAN
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# error Unknown machine endianness detected.
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# define LIBLAS_BYTE_ORDER __BYTE_ORDER
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#elif defined(_BIG_ENDIAN)
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# define LIBLAS_BIG_ENDIAN
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# define LIBLAS_BYTE_ORDER 4321
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#elif defined(_LITTLE_ENDIAN)
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# define LIBLAS_LITTLE_ENDIAN
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# define LIBLAS_BYTE_ORDER 1234
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// If they're both defined, we're assuming little for now. See http://liblas.org/ticket/133
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#elif defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)
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# define LIBLAS_LITTLE_ENDIAN
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# define LIBLAS_BYTE_ORDER 1234
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#elif defined(__sparc) || defined(__sparc__) \
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|| defined(_POWER) || defined(__powerpc__) \
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|| defined(__ppc__) || defined(__hpux) \
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|| defined(_MIPSEB) || defined(_POWER) \
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# define LIBLAS_BIG_ENDIAN
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# define LIBLAS_BYTE_ORDER 4321
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#elif defined(__i386__) || defined(__alpha__) \
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|| defined(__ia64) || defined(__ia64__) \
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|| defined(_M_IX86) || defined(_M_IA64) \
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|| defined(_M_ALPHA) || defined(__amd64) \
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|| defined(__amd64__) || defined(_M_AMD64) \
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|| defined(__x86_64) || defined(__x86_64__) \
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# define LIBLAS_LITTLE_ENDIAN
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# define LIBLAS_BYTE_ORDER 1234
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# error The file liblas/detail/endian.hpp needs to be set up for your CPU type.
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#if defined(LIBLAS_BIG_ENDIAN)
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# define LIBLAS_SWAP_BYTES(p) \
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char* first = static_cast<char*>(static_cast<void*>(&p)); \
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char* last = first + sizeof(p) - 1; \
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for(; first < last; ++first, --last) { \
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char const x = *last; \
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# define LIBLAS_SWAP_BYTES_N(p, n) \
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char* first = static_cast<char*>(static_cast<void*>(&p)); \
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char* last = first + n - 1; \
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for(; first < last; ++first, --last) { \
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char const x = *last; \
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# define LIBLAS_SWAP_BYTES(p) do {} while(false)
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# define LIBLAS_SWAP_BYTES_N(p, n) do {} while(false)
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#endif // LIBLAS_BIG_ENDIAN
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#endif // LIBLAS_DETAIL_ENDIAN_HPP_INCLUDED
added
removed
include/liblas/detail/endian.hpp
