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#!/usr/bin/env python
#
# Copyright 2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from optparse import OptionParser
import sys
def main():
parser = OptionParser()
parser.add_option("-f", "--file", default=None,
help="Choose file to read data from.")
(options, args) = parser.parse_args()
if options.file == None:
print "Must specify file to read from using '-f'."
sys.exit(1)
print "Using", options.file, "for data."
f = open(options.file, 'r')
runs = []
count = 0
current = 0
bytes = 0
bits = 0
for ch in f.read():
x = ord(ch)
bytes = bytes + 1
for i in range(7,-1,-1):
bits = bits + 1
t = (x >> i) & 0x1
if t == current:
count = count + 1
else:
if count > 0:
if len(runs) < count:
for j in range(count - len(runs)):
runs.append(0);
runs[count-1] = runs[count-1] + 1
current = 1-current;
count = 1
# Deal with last run at EOF
if len(runs) < count and count > 0:
for j in range(count - len(runs)):
runs.append(0);
runs[count-1] = runs[count-1] + 1
chk = 0
print "Bytes read: ", bytes
print "Bits read: ", bits
print
for i in range(len(runs)):
chk = chk + runs[i]*(i+1)
print "Runs of length", i+1, ":", runs[i]
print
print "Sum of runs:", chk, "bits"
print
print "Maximum run length is", len(runs), "bits"
if __name__ == "__main__":
main()
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