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#!/usr/bin/env python
# Copyright 2012 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, gr_unittest
import blocks_swig as blocks
import digital_swig as digital
try: import pmt
except: from gruel import pmt
class qa_crc32_bb (gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def test_001_crc_len (self):
""" Make sure the output of a CRC set is 4 bytes longer than the input. """
data = range(16)
tag_name = "len"
tag = gr.gr_tag_t()
tag.offset = 0
tag.key = pmt.string_to_symbol(tag_name)
tag.value = pmt.from_long(len(data))
src = gr.vector_source_b(data, False, 1, (tag,))
crc = digital.crc32_bb(False, tag_name)
sink = gr.vector_sink_b()
self.tb.connect(src, crc, sink)
self.tb.run()
# Check that the packets before crc_check are 4 bytes longer that the input.
self.assertEqual(len(data)+4, len(sink.data()))
def test_002_crc_equal (self):
""" Go through CRC set / CRC check and make sure the output
is the same as the input. """
data = (0, 1, 2, 3, 4, 5, 6, 7, 8)
tag_name = "len"
tag = gr.gr_tag_t()
tag.offset = 0
tag.key = pmt.string_to_symbol(tag_name)
tag.value = pmt.from_long(len(data))
src = gr.vector_source_b(data, False, 1, (tag,))
crc = digital.crc32_bb(False, tag_name)
crc_check = digital.crc32_bb(True, tag_name)
sink = gr.vector_sink_b()
self.tb.connect(src, crc, crc_check, sink)
self.tb.run()
# Check that the packets after crc_check are the same as input.
self.assertEqual(data, sink.data())
def test_003_crc_correct_lentag (self):
tag_name = "length"
pack_len = 8
packets = range(pack_len*2)
tag1 = gr.gr_tag_t()
tag1.offset = 0
tag1.key = pmt.string_to_symbol(tag_name)
tag1.value = pmt.from_long(pack_len)
tag2 = gr.gr_tag_t()
tag2.offset = pack_len
tag2.key = pmt.string_to_symbol(tag_name)
tag2.value = pmt.from_long(pack_len)
testtag1 = gr.gr_tag_t()
testtag1.offset = 1
testtag1.key = pmt.string_to_symbol("tag1")
testtag1.value = pmt.from_long(0)
testtag2 = gr.gr_tag_t()
testtag2.offset = pack_len
testtag2.key = pmt.string_to_symbol("tag2")
testtag2.value = pmt.from_long(0)
testtag3 = gr.gr_tag_t()
testtag3.offset = len(packets)-1
testtag3.key = pmt.string_to_symbol("tag3")
testtag3.value = pmt.from_long(0)
src = gr.vector_source_b(packets, False, 1, (tag1, tag2, testtag1, testtag2, testtag3))
crc = digital.crc32_bb(False, tag_name)
sink = gr.vector_sink_b()
self.tb.connect(src, crc, sink)
self.tb.run()
self.assertEqual(len(sink.data()), 2*(pack_len+4))
correct_offsets = {'tag1': 1, 'tag2': 12, 'tag3': 19}
tags_found = {'tag1': False, 'tag2': False, 'tag3': False}
for tag in sink.tags():
key = pmt.symbol_to_string(tag.key)
if key in correct_offsets.keys():
tags_found[key] = True
self.assertEqual(correct_offsets[key], tag.offset)
if key == tag_name:
self.assertTrue(tag.offset == 0 or tag.offset == pack_len+4)
self.assertTrue(all(tags_found.values()))
def test_004_fail (self):
""" Corrupt the data and make sure it fails CRC test. """
data = (0, 1, 2, 3, 4, 5, 6, 7)
tag_name = "len"
tag = gr.gr_tag_t()
tag.offset = 0
tag.key = pmt.string_to_symbol(tag_name)
tag.value = pmt.from_long(len(data))
src = gr.vector_source_b(data, False, 1, (tag,))
crc = digital.crc32_bb(False, tag_name)
crc_check = digital.crc32_bb(True, tag_name)
corruptor = blocks.add_const_bb(1)
sink = gr.vector_sink_b()
self.tb.connect(src, crc, corruptor, crc_check, sink)
self.tb.run()
# crc_check will drop invalid packets
self.assertEqual(len(sink.data()), 0)
def test_005_tag_propagation (self):
""" Make sure tags on the CRC aren't lost. """
data = (0, 1, 2, 3, 4, 5, 6, 7, 8, 230, 166, 39, 8)
tag_name = "len"
tag = gr.gr_tag_t()
tag.offset = 0
tag.key = pmt.string_to_symbol(tag_name)
tag.value = pmt.from_long(len(data))
testtag = gr.gr_tag_t()
testtag.offset = len(data)-1
testtag.key = pmt.string_to_symbol('tag1')
testtag.value = pmt.from_long(0)
src = gr.vector_source_b(data, False, 1, (tag, testtag))
crc_check = digital.crc32_bb(True, tag_name)
sink = gr.vector_sink_b()
self.tb.connect(src, crc_check, sink)
self.tb.run()
self.assertEqual([len(data)-5,], [tag.offset for tag in sink.tags() if pmt.symbol_to_string(tag.key) == 'tag1'])
if __name__ == '__main__':
gr_unittest.run(qa_crc32_bb, "qa_crc32_bb.xml")
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