gswapbytes
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	#!/usr/bin/env python
	'''
	Convert bigendian into little endian

	default file extension = .orb

	Yves Revaz
	mar mai 23 10:29:12 CEST 2006
	'''


	from Nbody import *


	try:
	from optparse import OptionParser
	except ImportError:
	from optik import OptionParser



	def parse_options():

	usage = "usage: %prog file_in file_out"
	parser = OptionParser(usage=usage)

	parser.add_option("-t",
	action="store",
	dest="ftype",
	type="string",
	default = None,
	help="type of the file",
	metavar=" TYPE")

	parser.add_option("-b",
	action="store",
	dest="byteorder",
	type="string",
	default = 'little',
	help="byte order 'little' or 'big'",
	metavar=" TYPE")

	(options, args) = parser.parse_args()


	if len(args)!=2:
	print "you must specify two file names"
	sys.exit(0)

	return args[0],args[1],options

	##########################################################
	#
	# MAIN
	#
	#########################################################


	# get options
	file1,file2,options = parse_options()
	ftype = options.ftype
	byteorder = options.byteorder

	nb = Nbody(file1,ftype=ftype,byteorder=byteorder)

	if nb.byteorder=='big':
	nb.byteorder='little'
	elif nb.byteorder=='little':
	nb.byteorder='big'
	else:
	print "unknown byteorder type"
	print "must be either 'little' or 'big' "

	print "transfroming into %s endian."%(nb.byteorder)

	nb.rename(file2)
	nb.write()