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import itertools
import unittest
import os
import subprocess
import binascii
import random
import tempfile
from cobs import cobs
INTERESTING = bytes([1, 2, 3, 0, 1, 2, 3, 0, 0, 1, 2, 3, 0, 0, 0, 1, 2, 3] + list(range(256)))
class MicrocobsScatterGatherTest(unittest.TestCase):
def do_test(self, data_sglist):
data_sglist = list(data_sglist)
ref = cobs.encode(b''.join(data_sglist))
input = b'\n'.join(binascii.hexlify(x) for x in data_sglist)
debug_file = tempfile.NamedTemporaryFile(prefix='microcobs_test_', delete=False)
debug_file.write(input)
try:
test = subprocess.check_output(os.getenv('MICROCOBS_SG_TEST_BINARY', 'build/microcobs_test_sg'),
input=input, stderr=subprocess.DEVNULL)
test = binascii.unhexlify(test.strip())
self.assertEqual(test[-1], 0, 'Missing terminating null byte')
self.assertEqual(ref, test[:-1], f'Mismatched output for input {debug_file.name}')
debug_file.close()
os.remove(debug_file.name)
except Exception as e:
raise SystemError(f'Test error for input {debug_file.name}') from e
def test_empty_chunks(self):
for i in range(256):
self.do_test([b''] * i)
def test_interspersed_empty_chunks(self):
testdata = INTERESTING
for i in range(len(testdata) + 1):
self.do_test([testdata[:i], b'', testdata[i:]])
def test_interspersed_double_empty_chunks(self):
testdata = INTERESTING
for i in range(len(testdata) + 1):
self.do_test([testdata[:i], b'', b'', testdata[i:]])
def test_one_byte_chunks(self):
testdata = INTERESTING
self.do_test(itertools.chain.from_iterable(zip([bytes([x]) for x in testdata], [b''] * len(testdata))))
def test_one_byte(self):
for i in range(256):
self.do_test([bytes([i])])
def test_lengths(self):
for i in range(260):
self.do_test([bytes([0xff] * i)])
def test_null_then_lengths(self):
for i in range(256):
self.do_test([bytes([0] + [0xff] * i)])
def test_lengths_then_null(self):
for i in range(256):
self.do_test([bytes([0xff] * i + [0])])
def test_two_byte(self):
for i in range(4):
for j in range(4):
self.do_test([bytes([i, j])])
self.do_test([bytes([i]), bytes([j])])
def test_long(self):
for i in range(5):
self.do_test([b'A' * (100 + 256*i)])
self.do_test([b'A' * 100] * 256*i)
def test_random(self):
for i in range(1000):
testdata = os.urandom(random.randint(0, 600))
chunks = [testdata]
for i in range(random.randint(0, len(testdata) // 5)):
idx = random.randint(0, len(chunks)-1)
chunk = chunks[idx]
bidx = random.randint(0, len(chunk))
chunks = chunks[:idx] + [chunk[:bidx], chunk[bidx:]] + chunks[idx+1:]
self.do_test(chunks)
class MicrocobsTest(unittest.TestCase):
def do_test(self, data):
ref = cobs.encode(data)
input = binascii.hexlify(data)
debug_file = tempfile.NamedTemporaryFile(prefix='microcobs_test_', delete=False)
debug_file.write(input)
try:
test = subprocess.check_output(os.getenv('MICROCOBS_TEST_BINARY', 'build/microcobs_test'),
input=input, stderr=subprocess.DEVNULL)
test = binascii.unhexlify(test.strip())
self.assertEqual(test[-1], 0, 'Missing terminating null byte')
self.assertEqual(ref, test[:-1], f'Mismatched output for input {debug_file.name}')
debug_file.close()
os.remove(debug_file.name)
except Exception as e:
raise SystemError(f'Test error for input {debug_file.name}') from e
def test_one_byte(self):
for i in range(256):
self.do_test(bytes([i]))
def test_lengths(self):
for i in range(260):
self.do_test(bytes([0xff] * i))
def test_null_then_lengths(self):
for i in range(256):
self.do_test(bytes([0] + [0xff] * i))
def test_lengths_then_null(self):
for i in range(256):
self.do_test(bytes([0xff] * i + [0]))
def test_two_byte(self):
for i in range(4):
for j in range(4):
self.do_test(bytes([i, j]))
def test_long(self):
for i in range(5):
self.do_test(b'A' * (100 + 256*i))
def test_random(self):
for i in range(10000):
self.do_test(os.urandom(random.randint(0, 600)))
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