diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2011-07-24 13:25:27 -0400 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2011-07-24 13:25:27 -0400 |
| commit | 1cb52da49230c64c3719b4ab944ba1cf5a9abb92 (patch) | |
| tree | 4c8b5c27f529601b3d24e5650fbb38441a08f27f /gr-digital/python/crc.py | |
| parent | 03e8904ef8800a96cad1d3131eb5cf351b5d4fb5 (diff) | |
digital: moved CRC32 from gnuradio-core to gr-digital. Also added QA code for it.
Diffstat (limited to 'gr-digital/python/crc.py')
| -rw-r--r-- | gr-digital/python/crc.py | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/gr-digital/python/crc.py b/gr-digital/python/crc.py new file mode 100644 index 0000000000..f9d369f4cb --- /dev/null +++ b/gr-digital/python/crc.py @@ -0,0 +1,37 @@ +# +# 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 gr, gru +import struct + +def gen_and_append_crc32(s): + crc = gr.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 = gr.crc32(msg) + (expected,) = struct.unpack(">I", s[-4:]) + # print "actual =", hex(actual), "expected =", hex(expected) + return (actual == expected, msg) |