/*
	q_endian.h
	endianness handling

	$Id: q_endian.h,v 1.4 2007/07/11 21:00:17 sezero Exp $
*/

#ifndef __QENDIAN_H
#define __QENDIAN_H

#include <sys/types.h>

extern short	ShortSwap (short);
extern int	LongSwap (int);
extern float	FloatSwap (float);

/*
 * endianness stuff: <sys/types.h> is supposed
 * to succeed in locating the correct endian.h
 * this BSD style may not work everywhere.
 */

#if defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)

# if (BYTE_ORDER != LITTLE_ENDIAN) && (BYTE_ORDER != BIG_ENDIAN)
/* pdp-endian, aka NUXI endian? not supported, at least not yet. */
# error "Unsupported endianness."
# endif

#else	/* one of the definitions is mising. */

# undef BYTE_ORDER
# undef LITTLE_ENDIAN
# undef BIG_ENDIAN
# define LITTLE_ENDIAN	1234
# define BIG_ENDIAN	4321

#endif	/* byte order defs */

#if !defined(BYTE_ORDER)
/* assumptions in case we have no endianness
   info. partially from older SDL headers. */
# define FALLBACK_ORDER	LITTLE_ENDIAN

# if defined(__hppa__) || defined(__sparc__) || defined (__ppc__) || defined(__POWERPC__) || defined(_M_PPC)
#	define	BYTE_ORDER	BIG_ENDIAN
# elif (defined(__i386) || defined(__i386__)) || defined(__amd64) || defined(__ia64__) || defined(__x86_64__)
#	define	BYTE_ORDER	LITTLE_ENDIAN
# elif (defined(__alpha__) || defined(__alpha))
#	define	BYTE_ORDER	LITTLE_ENDIAN
# elif defined(_WIN32) || defined(_WIN64) || defined(__DJGPP__) || defined(__DOS__)
#	define	BYTE_ORDER	LITTLE_ENDIAN
# else
#	/* fallback: caution recommended!! */
#	define	BYTE_ORDER	FALLBACK_ORDER
#	if  (FALLBACK_ORDER == BIG_ENDIAN)
#		define	ASSUMED_BIG_ENDIAN
#	else
#		define	ASSUMED_LITTLE_ENDIAN
#	endif
# endif
#endif	/* BYTE_ORDER */

#if BYTE_ORDER == BIG_ENDIAN

#define BigShort(s) (s)
#define LittleShort(s) ShortSwap((s))
#define BigLong(l) (l)
#define LittleLong(l) LongSwap((l))
#define BigFloat(f) (f)
#define LittleFloat(f) FloatSwap((f))

#else

/* BYTE_ORDER == LITTLE_ENDIAN */
#define BigShort(s) ShortSwap((s))
#define LittleShort(s) (s)
#define BigLong(l) LongSwap((l))
#define LittleLong(l) (l)
#define BigFloat(f) FloatSwap((f))
#define LittleFloat(f) (f)

#endif

#endif	/* __QENDIAN_H */