Documentation/networking/cxacru-cf.py

   1 #!/usr/bin/env python
   2 # Copyright 2009 Simon Arlott
   3 #
   4 # This program is free software; you can redistribute it and/or modify it
   5 # under the terms of the GNU General Public License as published by the Free
   6 # Software Foundation; either version 2 of the License, or (at your option)
   7 # any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful, but WITHOUT
  10 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 # more details.
  13 #
  14 # You should have received a copy of the GNU General Public License along with
  15 # this program; if not, write to the Free Software Foundation, Inc., 59
  16 # Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17 #
  18 # Usage: cxacru-cf.py < cxacru-cf.bin
  19 # Output: values string suitable for the sysfs adsl_config attribute
  20 #
  21 # Warning: cxacru-cf.bin with MD5 hash cdbac2689969d5ed5d4850f117702110
  22 # contains mis-aligned values which will stop the modem from being able
  23 # to make a connection. If the first and last two bytes are removed then
  24 # the values become valid, but the modulation will be forced to ANSI
  25 # T1.413 only which may not be appropriate.
  26 #
  27 # The original binary format is a packed list of le32 values.
  28
  29 import sys
  30 import struct
  31
  32 i = 0
  33 while True:
  34         buf = sys.stdin.read(4)
  35
  36         if len(buf) == 0:
  37                 break
  38         elif len(buf) != 4:
  39                 sys.stdout.write("\n")
  40                 sys.stderr.write("Error: read {0} not 4 bytes\n".format(len(buf)))
  41                 sys.exit(1)
  42
  43         if i > 0:
  44                 sys.stdout.write(" ")
  45         sys.stdout.write("{0:x}={1}".format(i, struct.unpack("<I", buf)[0]))
  46         i += 1
  47
  48 sys.stdout.write("\n")