21 if sys.argv[1] == '-':

    21 if sys.argv[1] == '-':

    22     log = sys.stderr

    22     log = sys.stderr

    23 else:

    23 else:

    24     log = open(sys.argv[1], 'a')

    24     log = open(sys.argv[1], 'a')

    25 

    25 

    26 def read(size):

    27 def read(size):

    27     data = sys.stdin.read(size)

    28     data = sys.stdin.read(size)

    28     if not data:

    29     if not data:

    29         raise EOFError

    30         raise EOFError

    30     sys.stdout.write(data)

    31     sys.stdout.write(data)

    31     sys.stdout.flush()

    32     sys.stdout.flush()

    32     return data

    33     return data

    33 

    35 

    34 try:

    36 try:

    35     while True:

    37     while True:

    36         header = read(outputfmtsize)

    38         header = read(outputfmtsize)

    37         channel, length = struct.unpack(outputfmt, header)

    39         channel, length = struct.unpack(outputfmt, header)