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	#!/usr/bin/python

	import sys, os
	from numpy import *

	file1 = sys.argv[1]
	file2 = sys.argv[2]

	isize1 = os.path.getsize(file1)
	isize2 = os.path.getsize(file2)

	if isize1 != isize2:
	print "files do not have the same size"
	sys.exit()


	f1 = open(file1)
	f2 = open(file2)

	block = 0


	while 1:

	block = block + 1
	print "block = %d"%(block)

	# header
	n1 = fromstring(f1.read(4),int32)[0]
	n2 = fromstring(f2.read(4),int32)[0]

	if n1!=n2:
	print "block %d, n1=%d n2=%d"%(block,n1,n2)
	sys.exit()

	print " reading n=%d octets"%(n1)

	# block
	l1 = f1.read(n1)
	l2 = f2.read(n2)

	if l1!=l2:
	print " block %d, l1=! l2"%(block)

	for i in range(len(l1)):
	print i,l1[i]==l2[i],">%s< >%s<"%(l1[i],l2[i])

	#sys.exit()


	# header
	n1 = fromstring(f1.read(4),int32)[0]
	n2 = fromstring(f2.read(4),int32)[0]

	fsize1 = f1.tell()
	fsize2 = f2.tell()

	if fsize1 != fsize2:
	print " error : fsize1=%d fsize2=%d"%(fsize1,fsize2)

	if (fsize1 == isize1) or (fsize2 == isize2):
	print "end of file"
	sys.exit()