linux/Documentation/networking/cxacru-cf.py
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   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
  29import sys
  30import struct
  31
  32i = 0
  33while 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
  48sys.stdout.write("\n")
  49
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