26 def corrupt(image, offset, length):  argument
28     f = os.open(image, os.O_WRONLY)
33 def corruptmax(image, roots):  argument
34     size = os.stat(image).st_size
42     corrupt(image, offset, max_errors)
44 def encode(image, fec, roots):  argument
45     if subprocess.call([ "fec", "--roots= " + str(roots), image, fec ]) != 0:
48 def decode(image, fec, output):  argument
49     return subprocess.call([ "fec", "--decode", image, fec, output ])
54 def simg2img(image, output):  argument
55     print "creating a non-sparse copy of '%s' to '%s'" % (image, output)
56     if subprocess.call([ "simg2img", image, output]) != 0:
60     image = argv[0]
67     simg2img(image, temp_img.name)
68     simg2img(image, temp_cor.name)
70     encode(image, temp_fec.name, roots)