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"""Test the binascii C module."""
import unittest
import binascii
import array
# Note: "*_hex" functions are aliases for "(un)hexlify"
b2a_functions = ['b2a_base64', 'b2a_hex', 'b2a_hqx', 'b2a_qp', 'b2a_uu',
'hexlify', 'rlecode_hqx']
a2b_functions = ['a2b_base64', 'a2b_hex', 'a2b_hqx', 'a2b_qp', 'a2b_uu',
'unhexlify', 'rledecode_hqx']
all_functions = a2b_functions + b2a_functions + ['crc32', 'crc_hqx']
class BinASCIITest(unittest.TestCase):
type2test = bytes
# Create binary test data
rawdata = b"The quick brown fox jumps over the lazy dog.\r\n"
# Be slow so we don't depend on other modules
rawdata += bytes(range(256))
rawdata += b"\r\nHello world.\n"
def setUp(self):
self.data = self.type2test(self.rawdata)
def test_exceptions(self):
# Check module exceptions
self.assertTrue(issubclass(binascii.Error, Exception))
self.assertTrue(issubclass(binascii.Incomplete, Exception))
def test_functions(self):
# Check presence of all functions
for name in all_functions:
self.assertTrue(hasattr(getattr(binascii, name), '__call__'))
self.assertRaises(TypeError, getattr(binascii, name))
def test_returned_value(self):
# Limit to the minimum of all limits (b2a_uu)
MAX_ALL = 45
raw = self.rawdata[:MAX_ALL]
for fa, fb in zip(a2b_functions, b2a_functions):
a2b = getattr(binascii, fa)
b2a = getattr(binascii, fb)
try:
a = b2a(self.type2test(raw))
res = a2b(self.type2test(a))
except Exception as err:
self.fail("{}/{} conversion raises {!r}".format(fb, fa, err))
if fb == 'b2a_hqx':
# b2a_hqx returns a tuple
res, _ = res
self.assertEqual(res, raw, "{}/{} conversion: "
"{!r} != {!r}".format(fb, fa, res, raw))
self.assertIsInstance(res, bytes)
self.assertIsInstance(a, bytes)
self.assertLess(max(a), 128)
self.assertIsInstance(binascii.crc_hqx(raw, 0), int)
self.assertIsInstance(binascii.crc32(raw), int)
def test_base64valid(self):
# Test base64 with valid data
MAX_BASE64 = 57
lines = []
for i in range(0, len(self.rawdata), MAX_BASE64):
b = self.type2test(self.rawdata[i:i+MAX_BASE64])
a = binascii.b2a_base64(b)
lines.append(a)
res = bytes()
for line in lines:
a = self.type2test(line)
b = binascii.a2b_base64(a)
res += b
self.assertEqual(res, self.rawdata)
def test_base64invalid(self):
# Test base64 with random invalid characters sprinkled throughout
# (This requires a new version of binascii.)
MAX_BASE64 = 57
lines = []
for i in range(0, len(self.data), MAX_BASE64):
b = self.type2test(self.rawdata[i:i+MAX_BASE64])
a = binascii.b2a_base64(b)
lines.append(a)
fillers = bytearray()
valid = b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/"
for i in range(256):
if i not in valid:
fillers.append(i)
def addnoise(line):
noise = fillers
ratio = len(line) // len(noise)
res = bytearray()
while line and noise:
if len(line) // len(noise) > ratio:
c, line = line[0], line[1:]
else:
c, noise = noise[0], noise[1:]
res.append(c)
return res + noise + line
res = bytearray()
for line in map(addnoise, lines):
a = self.type2test(line)
b = binascii.a2b_base64(a)
res += b
self.assertEqual(res, self.rawdata)
# Test base64 with just invalid characters, which should return
# empty strings. TBD: shouldn't it raise an exception instead ?
self.assertEqual(binascii.a2b_base64(self.type2test(fillers)), b'')
def test_uu(self):
MAX_UU = 45
lines = []
for i in range(0, len(self.data), MAX_UU):
b = self.type2test(self.rawdata[i:i+MAX_UU])
a = binascii.b2a_uu(b)
lines.append(a)
res = bytes()
for line in lines:
a = self.type2test(line)
b = binascii.a2b_uu(a)
res += b
self.assertEqual(res, self.rawdata)
self.assertEqual(binascii.a2b_uu(b"\x7f"), b"\x00"*31)
self.assertEqual(binascii.a2b_uu(b"\x80"), b"\x00"*32)
self.assertEqual(binascii.a2b_uu(b"\xff"), b"\x00"*31)
self.assertRaises(binascii.Error, binascii.a2b_uu, b"\xff\x00")
self.assertRaises(binascii.Error, binascii.a2b_uu, b"!!!!")
self.assertRaises(binascii.Error, binascii.b2a_uu, 46*b"!")
# Issue #7701 (crash on a pydebug build)
self.assertEqual(binascii.b2a_uu(b'x'), b'!> \n')
def test_crc32(self):
crc = binascii.crc32(self.type2test(b"Test the CRC-32 of"))
crc = binascii.crc32(self.type2test(b" this string."), crc)
self.assertEqual(crc, 1571220330)
self.assertRaises(TypeError, binascii.crc32)
def test_hqx(self):
# Perform binhex4 style RLE-compression
# Then calculate the hexbin4 binary-to-ASCII translation
rle = binascii.rlecode_hqx(self.data)
a = binascii.b2a_hqx(self.type2test(rle))
b, _ = binascii.a2b_hqx(self.type2test(a))
res = binascii.rledecode_hqx(b)
self.assertEqual(res, self.rawdata)
def test_hex(self):
# test hexlification
s = b'{s\005\000\000\000worldi\002\000\000\000s\005\000\000\000helloi\001\000\000\0000'
t = binascii.b2a_hex(self.type2test(s))
u = binascii.a2b_hex(self.type2test(t))
self.assertEqual(s, u)
self.assertRaises(binascii.Error, binascii.a2b_hex, t[:-1])
self.assertRaises(binascii.Error, binascii.a2b_hex, t[:-1] + b'q')
# Confirm that b2a_hex == hexlify and a2b_hex == unhexlify
self.assertEqual(binascii.hexlify(self.type2test(s)), t)
self.assertEqual(binascii.unhexlify(self.type2test(t)), u)
def test_qp(self):
# A test for SF bug 534347 (segfaults without the proper fix)
try:
binascii.a2b_qp(b"", **{1:1})
except TypeError:
pass
else:
self.fail("binascii.a2b_qp(**{1:1}) didn't raise TypeError")
self.assertEqual(binascii.a2b_qp(b"= "), b"= ")
self.assertEqual(binascii.a2b_qp(b"=="), b"=")
self.assertEqual(binascii.a2b_qp(b"=AX"), b"=AX")
self.assertRaises(TypeError, binascii.b2a_qp, foo="bar")
self.assertEqual(binascii.a2b_qp(b"=00\r\n=00"), b"\x00\r\n\x00")
self.assertEqual(
binascii.b2a_qp(b"\xff\r\n\xff\n\xff"),
b"=FF\r\n=FF\r\n=FF")
self.assertEqual(
binascii.b2a_qp(b"0"*75+b"\xff\r\n\xff\r\n\xff"),
b"0"*75+b"=\r\n=FF\r\n=FF\r\n=FF")
self.assertEqual(binascii.b2a_qp(b'\0\n'), b'=00\n')
self.assertEqual(binascii.b2a_qp(b'\0\n', quotetabs=True), b'=00\n')
self.assertEqual(binascii.b2a_qp(b'foo\tbar\t\n'), b'foo\tbar=09\n')
self.assertEqual(binascii.b2a_qp(b'foo\tbar\t\n', quotetabs=True),
b'foo=09bar=09\n')
self.assertEqual(binascii.b2a_qp(b'.'), b'=2E')
self.assertEqual(binascii.b2a_qp(b'.\n'), b'=2E\n')
self.assertEqual(binascii.b2a_qp(b'a.\n'), b'a.\n')
def test_empty_string(self):
# A test for SF bug #1022953. Make sure SystemError is not raised.
empty = self.type2test(b'')
for func in all_functions:
if func == 'crc_hqx':
# crc_hqx needs 2 arguments
binascii.crc_hqx(empty, 0)
continue
f = getattr(binascii, func)
try:
f(empty)
except Exception as err:
self.fail("{}({!r}) raises {!r}".format(func, empty, err))
def test_unicode_b2a(self):
# Unicode strings are not accepted by b2a_* functions.
for func in set(all_functions) - set(a2b_functions) | {'rledecode_hqx'}:
try:
self.assertRaises(TypeError, getattr(binascii, func), "test")
except Exception as err:
self.fail('{}("test") raises {!r}'.format(func, err))
# crc_hqx needs 2 arguments
self.assertRaises(TypeError, binascii.crc_hqx, "test", 0)
def test_unicode_a2b(self):
# Unicode strings are accepted by a2b_* functions.
MAX_ALL = 45
raw = self.rawdata[:MAX_ALL]
for fa, fb in zip(a2b_functions, b2a_functions):
if fa == 'rledecode_hqx':
# Takes non-ASCII data
continue
a2b = getattr(binascii, fa)
b2a = getattr(binascii, fb)
try:
a = b2a(self.type2test(raw))
binary_res = a2b(a)
a = a.decode('ascii')
res = a2b(a)
except Exception as err:
self.fail("{}/{} conversion raises {!r}".format(fb, fa, err))
if fb == 'b2a_hqx':
# b2a_hqx returns a tuple
res, _ = res
binary_res, _ = binary_res
self.assertEqual(res, raw, "{}/{} conversion: "
"{!r} != {!r}".format(fb, fa, res, raw))
self.assertEqual(res, binary_res)
self.assertIsInstance(res, bytes)
# non-ASCII string
self.assertRaises(ValueError, a2b, "\x80")
class ArrayBinASCIITest(BinASCIITest):
def type2test(self, s):
return array.array('B', list(s))
class BytearrayBinASCIITest(BinASCIITest):
type2test = bytearray
class MemoryviewBinASCIITest(BinASCIITest):
type2test = memoryview
if __name__ == "__main__":
unittest.main()
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