149 lines
6 KiB
C
149 lines
6 KiB
C
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/*
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---------------------------------------------------------------------------
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Copyright (c) 2003, Dr Brian Gladman, Worcester, UK. All rights reserved.
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LICENSE TERMS
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The free distribution and use of this software in both source and binary
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form is allowed (with or without changes) provided that:
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1. distributions of this source code include the above copyright
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notice, this list of conditions and the following disclaimer;
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2. distributions in binary form include the above copyright
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notice, this list of conditions and the following disclaimer
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in the documentation and/or other associated materials;
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3. the copyright holder's name is not used to endorse products
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built using this software without specific written permission.
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ALTERNATIVELY, provided that this notice is retained in full, this product
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may be distributed under the terms of the GNU General Public License (GPL),
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in which case the provisions of the GPL apply INSTEAD OF those given above.
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DISCLAIMER
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This software is provided 'as is' with no explicit or implied warranties
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in respect of its properties, including, but not limited to, correctness
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and/or fitness for purpose.
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---------------------------------------------------------------------------
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Issue 20/10/2006
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*/
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#ifndef BRG_ENDIAN_H
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#define BRG_ENDIAN_H
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#define IS_BIG_ENDIAN 4321 /* byte 0 is most significant (mc68k) */
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#define IS_LITTLE_ENDIAN 1234 /* byte 0 is least significant (i386) */
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/* Include files where endian defines and byteswap functions may reside */
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#if defined( __FreeBSD__ ) || defined( __OpenBSD__ ) || defined( __NetBSD__ )
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# include <sys/endian.h>
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#elif defined( BSD ) && ( BSD >= 199103 ) || defined( __APPLE__ ) || \
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defined( __CYGWIN32__ ) || defined( __DJGPP__ ) || defined( __osf__ )
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# include <machine/endian.h>
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#elif defined( __linux__ ) || defined( __GNUC__ ) || defined( __GNU_LIBRARY__ )
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# if !defined( __MINGW32__ ) && !defined(AVR)
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# include <endian.h>
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# if !defined( __BEOS__ )
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# include <byteswap.h>
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# endif
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# endif
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#endif
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/* Now attempt to set the define for platform byte order using any */
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/* of the four forms SYMBOL, _SYMBOL, __SYMBOL & __SYMBOL__, which */
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/* seem to encompass most endian symbol definitions */
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#if defined( BIG_ENDIAN ) && defined( LITTLE_ENDIAN )
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# if defined( BYTE_ORDER ) && BYTE_ORDER == BIG_ENDIAN
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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# elif defined( BYTE_ORDER ) && BYTE_ORDER == LITTLE_ENDIAN
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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# endif
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#elif defined( BIG_ENDIAN )
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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#elif defined( LITTLE_ENDIAN )
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#endif
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#if defined( _BIG_ENDIAN ) && defined( _LITTLE_ENDIAN )
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# if defined( _BYTE_ORDER ) && _BYTE_ORDER == _BIG_ENDIAN
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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# elif defined( _BYTE_ORDER ) && _BYTE_ORDER == _LITTLE_ENDIAN
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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# endif
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#elif defined( _BIG_ENDIAN )
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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#elif defined( _LITTLE_ENDIAN )
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#endif
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#if defined( __BIG_ENDIAN ) && defined( __LITTLE_ENDIAN )
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# if defined( __BYTE_ORDER ) && __BYTE_ORDER == __BIG_ENDIAN
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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# elif defined( __BYTE_ORDER ) && __BYTE_ORDER == __LITTLE_ENDIAN
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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# endif
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#elif defined( __BIG_ENDIAN )
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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#elif defined( __LITTLE_ENDIAN )
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#endif
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#if defined( __BIG_ENDIAN__ ) && defined( __LITTLE_ENDIAN__ )
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# if defined( __BYTE_ORDER__ ) && __BYTE_ORDER__ == __BIG_ENDIAN__
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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# elif defined( __BYTE_ORDER__ ) && __BYTE_ORDER__ == __LITTLE_ENDIAN__
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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# endif
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#elif defined( __BIG_ENDIAN__ )
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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#elif defined( __LITTLE_ENDIAN__ )
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#endif
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/* if the platform byte order could not be determined, then try to */
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/* set this define using common machine defines */
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#if !defined(PLATFORM_BYTE_ORDER)
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#if defined( __alpha__ ) || defined( __alpha ) || defined( i386 ) || \
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defined( __i386__ ) || defined( _M_I86 ) || defined( _M_IX86 ) || \
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defined( __OS2__ ) || defined( sun386 ) || defined( __TURBOC__ ) || \
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defined( vax ) || defined( vms ) || defined( VMS ) || \
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defined( __VMS ) || defined( _M_X64 ) || defined( AVR )
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#elif defined( AMIGA ) || defined( applec ) || defined( __AS400__ ) || \
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defined( _CRAY ) || defined( __hppa ) || defined( __hp9000 ) || \
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defined( ibm370 ) || defined( mc68000 ) || defined( m68k ) || \
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defined( __MRC__ ) || defined( __MVS__ ) || defined( __MWERKS__ ) || \
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defined( sparc ) || defined( __sparc) || defined( SYMANTEC_C ) || \
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defined( __VOS__ ) || defined( __TIGCC__ ) || defined( __TANDEM ) || \
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defined( THINK_C ) || defined( __VMCMS__ )
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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#elif 0 /* **** EDIT HERE IF NECESSARY **** */
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#elif 0 /* **** EDIT HERE IF NECESSARY **** */
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# define PLATFORM_BYTE_ORDER IS_BIG_ENDIAN
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#else
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# error Please edit lines 126 or 128 in brg_endian.h to set the platform byte order
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#endif
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#endif
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/* special handler for IA64, which may be either endianness (?) */
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/* here we assume little-endian, but this may need to be changed */
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#if defined(__ia64) || defined(__ia64__) || defined(_M_IA64)
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# define PLATFORM_MUST_ALIGN (1)
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#ifndef PLATFORM_BYTE_ORDER
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# define PLATFORM_BYTE_ORDER IS_LITTLE_ENDIAN
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#endif
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#endif
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#ifndef PLATFORM_MUST_ALIGN
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# define PLATFORM_MUST_ALIGN (0)
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#endif
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#endif /* ifndef BRG_ENDIAN_H */
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