device_drivers/atm/cxacru-cf.py

0001 #!/usr/bin/env python
0002 # Copyright 2009 Simon Arlott
0003 #
0004 # This program is free software; you can redistribute it and/or modify it
0005 # under the terms of the GNU General Public License as published by the Free
0006 # Software Foundation; either version 2 of the License, or (at your option)
0007 # any later version.
0008 #
0009 # This program is distributed in the hope that it will be useful, but WITHOUT
0010 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0011 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
0012 # more details.
0013 #
0014 # You should have received a copy of the GNU General Public License along with
0015 # this program; if not, write to the Free Software Foundation, Inc., 59
0016 # Temple Place - Suite 330, Boston, MA  02111-1307, USA.
0017 #
0018 # Usage: cxacru-cf.py < cxacru-cf.bin
0019 # Output: values string suitable for the sysfs adsl_config attribute
0020 #
0021 # Warning: cxacru-cf.bin with MD5 hash cdbac2689969d5ed5d4850f117702110
0022 # contains mis-aligned values which will stop the modem from being able
0023 # to make a connection. If the first and last two bytes are removed then
0024 # the values become valid, but the modulation will be forced to ANSI
0025 # T1.413 only which may not be appropriate.
0026 #
0027 # The original binary format is a packed list of le32 values.
0028
0029 import sys
0030 import struct
0031
0032 i = 0
0033 while True:
0034     buf = sys.stdin.read(4)
0035
0036     if len(buf) == 0:
0037         break
0038     elif len(buf) != 4:
0039         sys.stdout.write("\n")
0040         sys.stderr.write("Error: read {0} not 4 bytes\n".format(len(buf)))
0041         sys.exit(1)
0042
0043     if i > 0:
0044         sys.stdout.write(" ")
0045     sys.stdout.write("{0:x}={1}".format(i, struct.unpack("<I", buf)[0]))
0046     i += 1
0047
0048 sys.stdout.write("\n")