diff options
| author | Ben Reynwar <ben@reynwar.net> | 2013-03-07 23:11:20 -0700 |
|---|---|---|
| committer | Ben Reynwar <ben@reynwar.net> | 2013-03-07 23:11:20 -0700 |
| commit | a7c7cf1186ec73786e6bbefb430c940c8747f857 (patch) | |
| tree | b2f39e170547202ed772d95260563a73288b3326 /gr-digital/python/digital/crc.py | |
| parent | b841288cfb261da28746c4b3aaa7a1dfc078ebfd (diff) | |
digital: Enabling uninstalled python imports.
Diffstat (limited to 'gr-digital/python/digital/crc.py')
| -rw-r--r-- | gr-digital/python/digital/crc.py | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/gr-digital/python/digital/crc.py b/gr-digital/python/digital/crc.py new file mode 100644 index 0000000000..e228faaa98 --- /dev/null +++ b/gr-digital/python/digital/crc.py @@ -0,0 +1,38 @@ +# +# Copyright 2005,2007,2011 Free Software Foundation, Inc. +# +# This file is part of GNU Radio +# +# GNU Radio is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# GNU Radio is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with GNU Radio; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. +# + +from gnuradio import gru +import digital_swig as digital +import struct + +def gen_and_append_crc32(s): + crc = digital.crc32(s) + return s + struct.pack(">I", gru.hexint(crc) & 0xFFFFFFFF) + +def check_crc32(s): + if len(s) < 4: + return (False, '') + msg = s[:-4] + #print "msg = '%s'" % (msg,) + actual = digital.crc32(msg) + (expected,) = struct.unpack(">I", s[-4:]) + # print "actual =", hex(actual), "expected =", hex(expected) + return (actual == expected, msg) |