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83 lines
3 KiB
Python
83 lines
3 KiB
Python
# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import sys
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import tempfile
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import unittest
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# Allow us to run even if not at the `tools` directory.
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root_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
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sys.path.insert(0, root_dir)
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from hdlc import HDLCDecoder, hdlc_encode_data
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class TestHDLCDecode(unittest.TestCase):
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def test_line_noise(self):
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decoder = HDLCDecoder()
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decoder.write(b'This is a bunch')
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decoder.write(b'of line noise!!\x7e')
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decoder.write(b'\x7eFollowed by a valid frame\x7e')
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self.assertEquals(decoder.get_frame(), 'Followed by a valid frame')
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self.assertIsNone(decoder.get_frame())
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def test_segmented_frames(self):
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decoder = HDLCDecoder()
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decoder.write(b'\x7eFrame ')
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decoder.write(b'one\x7eFrame two')
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decoder.write(b'\x7eFrame thr')
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decoder.write(b'ee\x7e')
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self.assertEquals(decoder.get_frame(), 'Frame one')
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self.assertEquals(decoder.get_frame(), 'Frame two')
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self.assertEquals(decoder.get_frame(), 'Frame three')
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self.assertIsNone(decoder.get_frame())
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def test_empty(self):
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decoder = HDLCDecoder()
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decoder.write(b'\x7e\x7e\x7e\x7e')
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self.assertIsNone(decoder.get_frame())
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def test_escape(self):
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decoder = HDLCDecoder()
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decoder.write(b'\x7eHow about escaping?\x7d\x5e\x7e')
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decoder.write(b'\x7eAny ch\x7dArac\x7dTer can be \x7dE\x7dS\x7dC\x7dA\x7dPed!\x7e')
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decoder.write(b'\x7eEven a \x7d\x7d\x7e')
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self.assertEquals(decoder.get_frame(), 'How about escaping?\x7e')
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self.assertEquals(decoder.get_frame(), 'Any character can be escaped!')
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self.assertEquals(decoder.get_frame(), 'Even a \x5d')
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self.assertIsNone(decoder.get_frame())
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def test_invalid(self):
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decoder = HDLCDecoder()
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decoder.write(b'\x7eInvalid termination\x7d\x7e')
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decoder.write(b'\x7eI am valid\x7e')
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decoder.write(b'partial frame')
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self.assertEquals(decoder.get_frame(), 'I am valid')
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self.assertIsNone(decoder.get_frame())
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class TestHDLCEncodeData(unittest.TestCase):
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def test_simple(self):
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self.assertEquals(hdlc_encode_data('This is easy'), '\x7eThis is easy\x7e')
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def test_escape(self):
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self.assertEquals(hdlc_encode_data('Escape \x7d\x7e!'), '\x7eEscape \x7d\x5d\x7d\x5e!\x7e')
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def test_empty(self):
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self.assertEquals(hdlc_encode_data(''), '\x7e\x7e')
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if __name__ == '__main__':
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unittest.main()
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