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t_destruct.py
176 lines (155 loc) · 6.83 KB
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t_destruct.py
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from unittest import TestCase
import destruct as d
import struct as s
ls_odict = d.odict.from_list
class strbufTests(TestCase):
def setUp(self):
self.teststr = 'In God we trust. The rest, we test!'
self.buf = d.strbuf(self.teststr)
def test_reads(self):
self.assertEqual(str(self.buf.read(6)), 'In God')
self.assertEqual(str(self.buf.read(11)), ' we trust. ')
self.assertEqual(str(self.buf.read(30)), 'The rest, we test!')
def test_moving(self):
self.assertEqual(self.buf.pos, 0)
self.assertRaises(ValueError, self.buf.read, -1)
self.assertEqual(self.buf.pos, 0)
self.buf.pos += 9
self.assertEqual(self.buf.pos, 9)
self.buf.pos -= 3
self.assertEqual(self.buf.pos, 6)
self.buf.pos = 4
self.assertEqual(self.buf.pos, 4)
self.buf.read(10)
self.assertEqual(self.buf.pos, 14)
self.buf.read(0)
self.assertEqual(self.buf.pos, 14)
self.buf.read(30)
maxpos = len(self.teststr)
self.assertEqual(self.buf.pos, maxpos)
self.buf.pos = 100
self.assertEqual(self.buf.pos, maxpos)
def test_len(self):
maxpos = len(self.teststr)
self.assertEqual(maxpos, len(self.buf))
self.buf.read(5)
self.assertEqual(maxpos - 5, len(self.buf))
self.buf.read(10)
self.assertEqual(maxpos - 15, len(self.buf))
self.buf.read(30)
self.assertEqual(0, len(self.buf))
self.buf.pos = 0
self.assertEqual(maxpos, len(self.buf))
self.buf.pos = 12
self.assertEqual(maxpos - 12, len(self.buf))
class unpackTests(TestCase):
def setUp(self):
#struct scorecard{
# char name[40];
# uint32_t p_id;
# uint8_t points[42];
# uint32_t ranking;
#}
self.teststr = ('Jonny Normal' + ('\x00' * 28)
+ '\x2e\x01\x00\x00'
+ '\x00\x01\x05\x05\x10\x08\x18' + ('\x00' * 35)
+ '\x04\x00\x00\x00')
# That means Jonny Normal, id = 302, 7 games played with
# with [0, 1, 5, 5, 16, 8, 24] points on them, ranked 4th
self.buf = d.strbuf(self.teststr)
def test_string(self):
self.assertEqual(d.unpack('=40s', self.buf),
ls_odict(['Jonny Normal' + (28 * '\x00')]))
self.assertEqual(self.buf.pos, 40)
self.buf.pos = 0
self.assertEqual(d.unpack('=5s', self.buf),
ls_odict(['Jonny']))
def test_nested_string(self):
self.assertEqual(d.unpack('=(((s)2s)2s)s(s(5s))', self.buf),
ls_odict([ls_odict([ls_odict([ls_odict(['J']),
'on']),
'ny']),
' ',
ls_odict(['N',
ls_odict(['ormal'])
])
]))
# {{{{J}, on}, ny}, ' ', {N, {ormal}}}
self.assertEqual(self.buf.pos, 12)
def test_numbers(self):
self.buf.pos = 40
self.assertEqual(d.unpack('<I', self.buf), ls_odict([0x12e]))
self.buf.pos = 40
self.assertEqual(d.unpack('>I', self.buf), ls_odict([0x2e010000]))
def test_endiannes(self):
# make sure endianness distributes through the call stack
self.buf.pos = 44
self.assertEqual(d.unpack('<H((HH)H)', self.buf),
ls_odict([0x100,
ls_odict([ls_odict([0x0505, 0x0810]),
0x18])
]))
self.buf.pos = 44
self.assertEqual(d.unpack('>H((HH)H)', self.buf),
ls_odict([0x1,
ls_odict([ls_odict([0x0505, 0x1008]),
0x1800])
]))
def test_combo(self):
name, p_id, points, rank = d.unpack('<40s I (42B) I', self.buf).values()
self.assertEqual(name, 'Jonny Normal' + (28 * '\x00'))
self.assertEqual(p_id, 0x12e)
self.assertEqual(points, ls_odict([0, 1, 5, 5, 16, 8, 24] + ([0] * 35)))
self.assertEqual(rank, 4)
def test_naming(self):
self.assertEqual(d.unpack('<40s[name]', self.buf),
d.odict(name='Jonny Normal'+(28*'\x00')))
self.buf.pos = 0
expected = d.odict()
expected.append('Jonny Normal' + (28 * '\x00'))
expected['pid'] = 0x12e
expected['points'] = ls_odict([0, 1, 5, 5, 16, 8, 24] + ([0] * 35))
expected.append(4)
self.assertEqual(d.unpack('<40s I [pid] (42B)[points] I', self.buf),
expected)
def test_unmatched_parens(self):
# TODO tighten up the exception type, once it's been sub-classed in the
# destruct code
self.assertRaises(Exception, d.Struct, '(c(c)')
self.assertRaises(Exception, d.Struct, '(c))')
self.assertRaises(Exception, d.Struct, 'c[name(I)]')
self.assertRaises(Exception, d.Struct, 'c[name')
def test_whitespace(self):
self.assertEqual(d.unpack('<\n\n12s [name]\n 28x\n\tI \n\t[pid]\n\n\n',
self.buf),
d.odict([('name', 'Jonny Normal'),
('pid', 0x12e)]))
def test_comments(self):
self.assertEqual(d.unpack('<5s #6s\n x\n# s\n 6s', self.buf),
ls_odict(['Jonny', 'Normal']))
self.buf.pos = 0
self.assertEqual(d.unpack('<(5s\n x #ignore space\n 6s)[name]',
self.buf),
d.odict(name=ls_odict(['Jonny', 'Normal'])))
def test_dont_care(self):
self.assertEqual(d.unpack('<5s x 6s', self.buf),
ls_odict(['Jonny', 'Normal']))
self.buf.pos = 0
self.assertEqual(d.unpack('<3s[nickname] 3x c[initial] 5s', self.buf),
d.odict([('nickname', 'Jon'),
('initial', 'N'),
(2, 'ormal')]))
def test_funcs(self):
def five(buff):
return str(buff.read(5))
def four(buff):
return str(buff.read(4))
funcs = {'five': five, 'four': four}
st = d.Struct('$five$ $four$ $five$ $four$ $four$', funcs)
self.assertEqual(st.unpack('llamabirdrhinobearwolf'),
ls_odict('llama bird rhino bear wolf'.split()))
def test_invalid_funcs(self):
for f in 'fo(o foo[ foo) f]oo'.split():
self.assertRaises(Exception, d.Struct, '$%s$' % f)
self.assertRaises(KeyError, d.Struct, '$foo$')
self.assertRaises(Exception, d.Struct, '$foo')