OsmocomBB MS-side GSM Protocol stack (L1, L2, L3) including firmware https://osmocom.org/projects/baseband
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osmocom-bb/src/target/trx_toolkit/test_codec.py

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'''
Unit tests for declarative message codec.
'''
# (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
# Author: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
#
# All Rights Reserved
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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.
import unittest
import struct
import codec
class TestField(codec.Field):
DEF_PARAMS = { 'key' : 0xde }
DEF_LEN = 4
@staticmethod
def xor(data: bytes, key: int = 0x00):
return bytes([x ^ key for x in data])
def _from_bytes(self, vals: dict, data: bytes) -> None:
vals[self.name] = self.xor(data, self.p['key'])
def _to_bytes(self, vals: dict) -> bytes:
return self.xor(self.get_val(vals), self.p['key'])
class Field(unittest.TestCase):
MAGIC = b'\xde\xad\xbe\xef'
def test_to_bytes(self):
vals = { 'magic' : self.MAGIC, 'other' : 'unrelated' }
encoded_de = TestField.xor(self.MAGIC, 0xde)
encoded_88 = TestField.xor(self.MAGIC, 0x88)
with self.subTest('default length=4, default key=0xde'):
field = TestField('magic')
self.assertEqual(field.to_bytes(vals), encoded_de)
with self.subTest('default length=4, different key=0x88'):
field = TestField('magic', key=0x88)
self.assertEqual(field.to_bytes(vals), encoded_88)
with self.subTest('different length=2, default key=0xde'):
field = TestField('magic', len=2)
vals['magic'] = vals['magic'][:2]
self.assertEqual(field.to_bytes(vals), encoded_de[:2])
with self.subTest('EncodeError due to length mismatch'):
field = TestField('magic', len=8)
with self.assertRaises(codec.EncodeError):
field.to_bytes(vals)
def test_from_bytes(self):
encoded_de = TestField.xor(self.MAGIC, 0xde) + b'\xff' * 60
encoded_88 = TestField.xor(self.MAGIC, 0x88) + b'\xff' * 60
vals = { 'magic' : 'overrien', 'other' : 'unchanged' }
with self.subTest('default length=4, default key=0xde'):
field = TestField('magic')
offset = field.from_bytes(vals, encoded_de)
self.assertEqual(vals['other'], 'unchanged')
self.assertEqual(vals['magic'], self.MAGIC)
self.assertEqual(offset, len(self.MAGIC))
with self.subTest('default length=4, different key=0x88'):
field = TestField('magic', key=0x88)
offset = field.from_bytes(vals, encoded_88)
self.assertEqual(vals['other'], 'unchanged')
self.assertEqual(vals['magic'], self.MAGIC)
self.assertEqual(offset, len(self.MAGIC))
with self.subTest('different length=2, default key=0xde'):
field = TestField('magic', len=2)
offset = field.from_bytes(vals, encoded_de)
self.assertEqual(vals['other'], 'unchanged')
self.assertEqual(vals['magic'], self.MAGIC[:2])
self.assertEqual(offset, 2)
with self.subTest('full length, different key=0x88'):
field = TestField('magic', len=0, key=0x88)
offset = field.from_bytes(vals, encoded_88)
self.assertEqual(vals['other'], 'unchanged')
self.assertEqual(vals['magic'], self.MAGIC + b'\x77' * 60)
self.assertEqual(offset, len(encoded_88))
with self.subTest('DecodeError due to short read'):
field = TestField('magic', len=4)
with self.assertRaises(codec.DecodeError):
field.from_bytes(vals, b'\x00')
def test_get_pres(self):
vals = { 'magic' : self.MAGIC }
with self.subTest('to_bytes() for a non-existing field'):
field = TestField('not-there')
with self.assertRaises(KeyError):
field.to_bytes(vals)
with self.subTest('to_bytes() for a field with get_pres()'):
field = TestField('magic', key=0x00)
field.get_pres = lambda v: not v['omit']
data = field.to_bytes({ **vals, 'omit' : False })
self.assertEqual(data, self.MAGIC)
data = field.to_bytes({ **vals, 'omit' : True })
self.assertEqual(data, b'')
with self.subTest('from_bytes() for a field with get_pres()'):
field = TestField('magic', key=0x00)
field.get_pres = lambda v: not v['omit']
vals = { 'omit' : False }
offset = field.from_bytes(vals, self.MAGIC)
self.assertEqual(vals['magic'], self.MAGIC)
self.assertEqual(offset, len(self.MAGIC))
vals = { 'omit' : True }
offset = field.from_bytes(vals, self.MAGIC)
self.assertFalse('magic' in vals)
self.assertEqual(offset, 0)
def test_get_len(self):
vals = { 'len' : 32, 'unrelated' : 'foo' }
field = TestField('magic', key=0x00)
field.get_len = lambda v, _: v['len']
with self.subTest('not enough octets in the buffer: 16 < 32'):
with self.assertRaises(codec.DecodeError):
field.from_bytes(vals, b'\xff' * 16)
with self.subTest('more than enough octets in the buffer'):
offset = field.from_bytes(vals, b'\xff' * 64)
self.assertEqual(vals['magic'], b'\xff' * 32)
self.assertEqual(offset, 32)
with self.subTest('length field does not exist'):
with self.assertRaises(KeyError):
field.from_bytes({ }, b'\xff' * 64)
def test_get_val(self):
field = TestField('magic', key=0x00, len=0)
field.get_val = lambda v: v.get('val', self.MAGIC)
with self.subTest('value is present in the dict'):
data = field.to_bytes({ 'val' : b'\xd0\xde' })
self.assertEqual(data, b'\xd0\xde')
with self.subTest('value is not present in the dict'):
data = field.to_bytes({ })
self.assertEqual(data, self.MAGIC)
class Buf(unittest.TestCase):
MAGIC = b'\xde\xad' * 4
def test_to_bytes(self):
vals = { 'buf' : self.MAGIC }
with self.subTest('with no length constraints'):
field = codec.Buf('buf') # default: len=0
self.assertEqual(field.to_bytes(vals), self.MAGIC)
with self.subTest('with length constraints'):
field = codec.Buf('buf', len=len(self.MAGIC))
self.assertEqual(field.to_bytes(vals), self.MAGIC)
with self.subTest('EncodeError due to length mismatch'):
field = codec.Buf('buf', len=4)
with self.assertRaises(codec.EncodeError):
field.to_bytes(vals)
def test_from_bytes(self):
vals = { }
with self.subTest('with no length constraints'):
field = codec.Buf('buf') # default: len=0
offset = field.from_bytes(vals, self.MAGIC)
self.assertEqual(vals['buf'], self.MAGIC)
self.assertEqual(offset, len(self.MAGIC))
with self.subTest('with length constraints'):
field = codec.Buf('buf', len=2)
offset = field.from_bytes(vals, self.MAGIC)
self.assertEqual(vals['buf'], self.MAGIC[:2])
self.assertEqual(offset, len(self.MAGIC[:2]))
with self.subTest('DecodeError due to not enough bytes'):
field = codec.Buf('buf', len=64)
with self.assertRaises(codec.DecodeError):
field.from_bytes(vals, self.MAGIC)
class Spare(unittest.TestCase):
# Fixed length with custom filler
SAA = codec.Spare('pad', len=4, filler=b'\xaa')
# Auto-calculated length with custom filler
SFF = codec.Spare('pad', filler=b'\xff')
SFF.get_len = lambda v, _: v['len']
# Fixed length with default filler
S00 = codec.Spare('pad', len=2)
def test_to_bytes(self):
self.assertEqual(self.SFF.to_bytes({ 'len' : 8 }), b'\xff' * 8)
self.assertEqual(self.SAA.to_bytes({ }), b'\xaa' * 4)
self.assertEqual(self.S00.to_bytes({ }), b'\x00' * 2)
def test_from_bytes(self):
with self.assertRaises(codec.DecodeError):
self.S00.from_bytes({ }, b'\x00') # Short read
self.assertEqual(self.SFF.from_bytes({ 'len' : 8 }, b'\xff' * 8), 8)
self.assertEqual(self.SAA.from_bytes({ }, b'\xaa' * 64), 4)
self.assertEqual(self.S00.from_bytes({ }, b'\x00' * 64), 2)
class Uint(unittest.TestCase):
def _test_uint(self, field, fmt, vals):
for i in vals:
with self.subTest('to_bytes()'):
val = field.to_bytes({ field.name : i })
self.assertEqual(val, struct.pack(fmt, i))
with self.subTest('from_bytes()'):
data, parsed = struct.pack(fmt, i), { }
offset = field.from_bytes(parsed, data)
self.assertEqual(offset, len(data))
self.assertEqual(parsed[field.name], i)
def test_uint8(self):
self._test_uint(codec.Uint('foo'), 'B', range(2 ** 8))
def test_int8(self):
self._test_uint(codec.Int('foo'), 'b', range(-128, 128))
def test_uint16(self):
vals = (0, 65, 128, 255, 512, 1023, 2 ** 16 - 1)
self._test_uint(codec.Uint16BE('foo'), '>H', vals)
self._test_uint(codec.Uint16LE('foo'), '<H', vals)
def test_int16(self):
vals = (-32767, -16384, 0, 16384, 32767)
self._test_uint(codec.Int16BE('foo'), '>h', vals)
self._test_uint(codec.Int16LE('foo'), '<h', vals)
def test_uint32(self):
vals = (0, 33, 255, 1024, 1337, 4099, 2 ** 32 - 1)
self._test_uint(codec.Uint32BE('foo'), '>I', vals)
self._test_uint(codec.Uint32LE('foo'), '<I', vals)
def test_int32(self):
vals = (-2147483647, 0, 2147483647)
self._test_uint(codec.Int32BE('foo'), '>i', vals)
self._test_uint(codec.Int32LE('foo'), '<i', vals)
def test_offset_mult(self):
with self.subTest('encode / decode with offset=5'):
field = codec.Uint('foo', offset=5)
self.assertEqual(field.to_bytes({ 'foo' : 10 }), b'\x05')
self.assertEqual(field.to_bytes({ 'foo' : 5 }), b'\x00')
vals = { 'foo' : 'overriden' }
field.from_bytes(vals, b'\xff')
self.assertEqual(vals['foo'], 260)
field.from_bytes(vals, b'\x00')
self.assertEqual(vals['foo'], 5)
with self.subTest('encode / decode with mult=2'):
field = codec.Uint('foo', mult=2)
self.assertEqual(field.to_bytes({ 'foo' : 0 }), b'\x00')
self.assertEqual(field.to_bytes({ 'foo' : 3 }), b'\x01')
self.assertEqual(field.to_bytes({ 'foo' : 32 }), b'\x10')
self.assertEqual(field.to_bytes({ 'foo' : 64 }), b'\x20')
vals = { 'foo' : 'overriden' }
field.from_bytes(vals, b'\x00')
self.assertEqual(vals['foo'], 0 * 2)
field.from_bytes(vals, b'\x0f')
self.assertEqual(vals['foo'], 15 * 2)
field.from_bytes(vals, b'\xff')
self.assertEqual(vals['foo'], 255 * 2)
class BitFieldSet(unittest.TestCase):
S16 = codec.BitFieldSet(set=(
codec.BitField('f4a', bl=4),
codec.BitField('f8', bl=8),
codec.BitField('f4b', bl=4),
))
S8M = codec.BitFieldSet(order='msb', set=(
codec.BitField('f4', bl=4),
codec.BitField('f1', bl=1),
codec.BitField('f3', bl=3),
))
S8L = codec.BitFieldSet(order='lsb', set=(
codec.BitField('f4', bl=4),
codec.BitField('f1', bl=1),
codec.BitField('f3', bl=3),
))
S8V = codec.BitFieldSet(set=(
codec.BitField('f4', bl=4, val=2),
codec.BitField('f1', bl=1, val=0),
codec.BitField('f3', bl=3),
))
S8P = codec.BitFieldSet(set=(
codec.BitField.Spare(bl=4),
codec.BitField('f4', bl=4),
))
@staticmethod
def from_bytes(s: codec.BitFieldSet, data: bytes) -> dict:
vals = { }
s.from_bytes(vals, data)
return vals
def test_len_auto(self):
with self.subTest('1 + 2 = 3 bits => 1 octet (with padding)'):
s = codec.BitFieldSet(set=(
codec.BitField('f1', bl=1),
codec.BitField('f2', bl=2),
))
self.assertEqual(s.len, 1)
with self.subTest('4 + 2 + 2 = 8 bits => 1 octet'):
s = codec.BitFieldSet(set=(
codec.BitField('f4', bl=4),
codec.BitField('f2a', bl=2),
codec.BitField('f2b', bl=2),
))
self.assertEqual(s.len, 1)
with self.subTest('12 + 4 + 2 = 18 bits => 3 octets (with padding)'):
s = codec.BitFieldSet(set=(
codec.BitField('f12', bl=12),
codec.BitField('f4', bl=4),
codec.BitField('f2', bl=2),
))
self.assertEqual(s.len, 3)
def test_overflow(self):
with self.assertRaises(codec.ProtocolError):
s = codec.BitFieldSet(len=1, set=(
codec.BitField('f6', bl=6),
codec.BitField('f4', bl=4),
))
def test_offset_mask(self):
calc = lambda s: [(f.name, f.offset, f.mask) for f in s._fields]
with self.subTest('16 bit total (MSB): f4a + f8 + f4b'):
om = [('f4a', 8 + 4, 0x0f), ('f8', 4, 0xff), ('f4b', 0, 0x0f)]
self.assertEqual(len(self.S16._fields), 3)
self.assertEqual(calc(self.S16), om)
with self.subTest('8 bit total (MSB): f4 + f1 + f3'):
om = [('f4', 1 + 3, 0x0f), ('f1', 3, 0x01), ('f3', 0, 0x07)]
self.assertEqual(len(self.S8M._fields), 3)
self.assertEqual(calc(self.S8M), om)
with self.subTest('8 bit total (LSB): f4 + f1 + f3'):
om = [('f3', 1 + 4, 0x07), ('f1', 4, 0x01), ('f4', 0, 0x0f)]
self.assertEqual(len(self.S8L._fields), 3)
self.assertEqual(calc(self.S8L), om)
with self.subTest('8 bit total (LSB): s4 + f4'):
om = [(None, 4, 0x0f), ('f4', 0, 0x0f)]
self.assertEqual(len(self.S8P._fields), 2)
self.assertEqual(calc(self.S8P), om)
def test_to_bytes(self):
with self.subTest('16 bit total (MSB): f4a + f8 + f4b'):
vals = { 'f4a' : 0x0f, 'f8' : 0xff, 'f4b' : 0x0f }
self.assertEqual(self.S16.to_bytes(vals), b'\xff\xff')
vals = { 'f4a' : 0x00, 'f8' : 0x00, 'f4b' : 0x00 }
self.assertEqual(self.S16.to_bytes(vals), b'\x00\x00')
vals = { 'f4a' : 0x0f, 'f8' : 0x00, 'f4b' : 0x0f }
self.assertEqual(self.S16.to_bytes(vals), b'\xf0\x0f')
vals = { 'f4a' : 0x00, 'f8' : 0xff, 'f4b' : 0x00 }
self.assertEqual(self.S16.to_bytes(vals), b'\x0f\xf0')
with self.subTest('8 bit total (MSB): f4 + f1 + f3'):
vals = { 'f4' : 0x0f, 'f1' : 0x01, 'f3' : 0x07 }
self.assertEqual(self.S8M.to_bytes(vals), b'\xff')
vals = { 'f4' : 0x00, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.S8M.to_bytes(vals), b'\x00')
vals = { 'f4' : 0x0f, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.S8M.to_bytes(vals), b'\xf0')
with self.subTest('8 bit total (LSB): f4 + f1 + f3'):
vals = { 'f4' : 0x0f, 'f1' : 0x01, 'f3' : 0x07 }
self.assertEqual(self.S8L.to_bytes(vals), b'\xff')
vals = { 'f4' : 0x00, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.S8L.to_bytes(vals), b'\x00')
vals = { 'f4' : 0x0f, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.S8L.to_bytes(vals), b'\x0f')
def test_from_bytes(self):
pad = b'\xff' * 64
with self.subTest('16 bit total (MSB): f4a + f8 + f4b'):
vals = { 'f4a' : 0x0f, 'f8' : 0xff, 'f4b' : 0x0f }
self.assertEqual(self.from_bytes(self.S16, b'\xff\xff' + pad), vals)
vals = { 'f4a' : 0x00, 'f8' : 0x00, 'f4b' : 0x00 }
self.assertEqual(self.from_bytes(self.S16, b'\x00\x00' + pad), vals)
vals = { 'f4a' : 0x0f, 'f8' : 0x00, 'f4b' : 0x0f }
self.assertEqual(self.from_bytes(self.S16, b'\xf0\x0f' + pad), vals)
vals = { 'f4a' : 0x00, 'f8' : 0xff, 'f4b' : 0x00 }
self.assertEqual(self.from_bytes(self.S16, b'\x0f\xf0' + pad), vals)
with self.subTest('8 bit total (MSB): f4 + f1 + f3'):
vals = { 'f4' : 0x0f, 'f1' : 0x01, 'f3' : 0x07 }
self.assertEqual(self.from_bytes(self.S8M, b'\xff' + pad), vals)
vals = { 'f4' : 0x00, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.from_bytes(self.S8M, b'\x00' + pad), vals)
vals = { 'f4' : 0x0f, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.from_bytes(self.S8M, b'\xf0' + pad), vals)
with self.subTest('8 bit total (LSB): f4 + f1 + f3'):
vals = { 'f4' : 0x0f, 'f1' : 0x01, 'f3' : 0x07 }
self.assertEqual(self.from_bytes(self.S8L, b'\xff' + pad), vals)
vals = { 'f4' : 0x00, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.from_bytes(self.S8L, b'\x00' + pad), vals)
vals = { 'f4' : 0x0f, 'f1' : 0x00, 'f3' : 0x00 }
self.assertEqual(self.from_bytes(self.S8L, b'\x0f' + pad), vals)
def test_to_bytes_val(self):
with self.subTest('fixed values in absence of user-supplied values'):
vals = { 'f3' : 0x00 } # | { 'f4' : 2, 'f1' : 0 }
self.assertEqual(self.S8V.to_bytes(vals), b'\x20')
with self.subTest('fixed values take precedence'):
vals = { 'f4' : 1, 'f1' : 1, 'f3' : 0 }
self.assertEqual(self.S8V.to_bytes(vals), b'\x20')
def test_from_bytes_val(self):
with self.assertRaises(codec.DecodeError):
self.S8V.from_bytes({ }, b'\xf0') # 'f4': 15 vs 2
with self.assertRaises(codec.DecodeError):
self.S8V.from_bytes({ }, b'\x08') # 'f1': 1 vs 0
# Field 'f3' takes any value, no exceptions shall be raised
for i in range(8):
data, vals = bytes([0x20 + i]), { 'f4' : 2, 'f1' : 0, 'f3' : i }
self.assertEqual(self.from_bytes(self.S8V, data), vals)
def test_to_bytes_spare(self):
self.assertEqual(self.S8P.to_bytes({ 'f4' : 0x00 }), b'\x00')
self.assertEqual(self.S8P.to_bytes({ 'f4' : 0x0f }), b'\x0f')
self.assertEqual(self.S8P.to_bytes({ 'f4' : 0xff }), b'\x0f')
def test_from_bytes_spare(self):
self.assertEqual(self.from_bytes(self.S8P, b'\x00'), { 'f4' : 0x00 })
self.assertEqual(self.from_bytes(self.S8P, b'\x0f'), { 'f4' : 0x0f })
self.assertEqual(self.from_bytes(self.S8P, b'\xff'), { 'f4' : 0x0f })
class TestPDU(codec.Envelope):
STRUCT = (
codec.BitFieldSet(len=2, set=(
codec.BitField('ver', bl=4),
codec.BitField('flag', bl=1),
)),
codec.Uint16BE('len'),
codec.Buf('data'),
codec.Buf('tail', len=2),
)
def __init__(self, *args, **kw):
codec.Envelope.__init__(self, *args, **kw)
self.STRUCT[-3].get_val = lambda v: len(v['data'])
self.STRUCT[-2].get_len = lambda v, _: v['len']
self.STRUCT[-1].get_pres = lambda v: bool(v['flag'])
def check(self, vals: dict) -> None:
if not vals['ver'] in (0, 1, 2):
raise ValueError('Unknown version %d' % vals['ver'])
class Envelope(unittest.TestCase):
def test_rest_octets(self):
pdu = TestPDU(check_len=False)
pdu.from_bytes(b'\x00' * 64)
with self.assertRaises(codec.DecodeError):
pdu = TestPDU(check_len=True)
pdu.from_bytes(b'\x00' * 64) # 'len' : 0
def test_field_raises(self):
pdu = TestPDU()
with self.assertRaises(codec.EncodeError):
pdu.c = { 'ver' : 0, 'flag' : 1, 'data' : b'\xff' * 16 }
pdu.to_bytes() # KeyError: 'tail' not found
def test_to_bytes(self):
pdu = TestPDU()
# No content in the new instances
self.assertEqual(pdu.c, { })
pdu.c = { 'ver' : 0, 'flag' : 1, 'data' : b'', 'tail' : b'\xde\xbe' }
self.assertEqual(pdu.to_bytes(), b'\x08\x00\x00\x00' + b'\xde\xbe')
pdu.c = { 'ver' : 1, 'flag' : 0, 'data' : b'\xff' * 15 }
self.assertEqual(pdu.to_bytes(), b'\x10\x00\x00\x0f' + b'\xff' * 15)
pdu.c = { 'ver' : 2, 'flag' : 1, 'data' : b'\xf0', 'tail' : b'\xbe\xed' }
self.assertEqual(pdu.to_bytes(), b'\x28\x00\x00\x01\xf0\xbe\xed')
def test_from_bytes(self):
pdu = TestPDU()
# No content in the new instances
self.assertEqual(pdu.c, { })
c = { 'ver' : 0, 'flag' : 1, 'len' : 0, 'data' : b'', 'tail' : b'\xde\xbe' }
pdu.from_bytes(b'\x08\x00\x00\x00' + b'\xde\xbe')
self.assertEqual(pdu.c, c)
c = { 'ver' : 1, 'flag' : 0, 'len' : 15, 'data' : b'\xff' * 15 }
pdu.from_bytes(b'\x10\x00\x00\x0f' + b'\xff' * 15)
self.assertEqual(pdu.c, c)
c = { 'ver' : 2, 'flag' : 1, 'len' : 1, 'data' : b'\xf0', 'tail' : b'\xbe\xed' }
pdu.from_bytes(b'\x28\x00\x00\x01\xf0\xbe\xed')
self.assertEqual(pdu.c, c)
def test_to_bytes_check(self):
pdu = TestPDU()
pdu.c = { 'ver' : 8, 'flag' : 1, 'data' : b'', 'tail' : b'\xde\xbe' }
with self.assertRaises(ValueError):
pdu.to_bytes()
def test_from_bytes_check(self):
pdu = TestPDU()
with self.assertRaises(ValueError):
pdu.from_bytes(b'\xf0\x00\x00\x00')
class Sequence(unittest.TestCase):
class TLV(codec.Envelope):
STRUCT = (
codec.Uint('T'),
codec.Uint('L'),
codec.Buf('V'),
)
def __init__(self, *args, **kw) -> None:
codec.Envelope.__init__(self, *args, **kw)
self.STRUCT[-2].get_val = lambda v: len(v['V'])
self.STRUCT[-1].get_len = lambda v, _: v['L']
# Sequence of TLVs
SEQ = codec.Sequence(item=TLV())
Vseq, Bseq = [
{ 'T' : 0xde, 'L' : 4, 'V' : b'\xde\xad\xbe\xef' },
{ 'T' : 0xbe, 'L' : 2, 'V' : b'\xbe\xef' },
{ 'T' : 0xbe, 'L' : 2, 'V' : b'\xef\xbe' },
{ 'T' : 0x00, 'L' : 0, 'V' : b'' },
], b''.join([
b'\xde\x04\xde\xad\xbe\xef',
b'\xbe\x02\xbe\xef',
b'\xbe\x02\xef\xbe',
b'\x00\x00',
])
def test_to_bytes(self):
res = self.SEQ.to_bytes(self.Vseq)
self.assertEqual(res, self.Bseq)
def test_from_bytes(self):
res = self.SEQ.from_bytes(self.Bseq)
self.assertEqual(res, self.Vseq)
if __name__ == '__main__':
unittest.main()