#!/usr/local/bin/python
#
# revert serial-port log file from CSV time-stamped data (base64) to plain output.
#
# $Header$

import os
import sys
import string
import time

import base64
import csv

def csv2raw(file):
	"""filter thru a file.
	"""

	with open(file, 'rb') as csvf:
		logreader = csv.DictReader(csvf)
		try:
			for line in logreader:
				#print line["buflen"]
				#print line["b64encode"]
				sys.stdout.write(base64.b64decode(line["b64encode"]))
		except csv.Error as e:
			sys.exit('file %s, line %d: %s' % (file, logreader.line_num, e))
####

if __name__ == '__main__':
	if len(sys.argv) <= 1:
		print "Usage: %s {filename}" % sys.argv[0]
		sys.exit(1)

	csv2raw(sys.argv[1])