From 1cb52da49230c64c3719b4ab944ba1cf5a9abb92 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Sun, 24 Jul 2011 13:25:27 -0400
Subject: digital: moved CRC32 from gnuradio-core to gr-digital. Also added QA
code for it.
---
gr-digital/python/crc.py | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644 gr-digital/python/crc.py
(limited to 'gr-digital/python/crc.py')
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)
--
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