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"""Test the binascii C module."""
from test import support
import unittest
import binascii
class BinASCIITest(unittest.TestCase):
# Create binary test data
data = b"The quick brown fox jumps over the lazy dog.\r\n"
# Be slow so we don't depend on other modules
data += bytes(range(256))
data += b"\r\nHello world.\n"
def test_exceptions(self):
# Check module exceptions
self.assert_(issubclass(binascii.Error, Exception))
self.assert_(issubclass(binascii.Incomplete, Exception))
def test_functions(self):
# Check presence of all functions
funcs = []
for suffix in "base64", "hqx", "uu", "hex":
prefixes = ["a2b_", "b2a_"]
if suffix == "hqx":
prefixes.extend(["crc_", "rlecode_", "rledecode_"])
for prefix in prefixes:
name = prefix + suffix
self.assert_(hasattr(getattr(binascii, name), '__call__'))
self.assertRaises(TypeError, getattr(binascii, name))
for name in ("hexlify", "unhexlify"):
self.assert_(hasattr(getattr(binascii, name), '__call__'))
self.assertRaises(TypeError, getattr(binascii, name))
def test_base64valid(self):
# Test base64 with valid data
MAX_BASE64 = 57
lines = []
for i in range(0, len(self.data), MAX_BASE64):
b = self.data[i:i+MAX_BASE64]
a = binascii.b2a_base64(b)
lines.append(a)
res = bytes()
for line in lines:
b = binascii.a2b_base64(line)
res += b
self.assertEqual(res, self.data)
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.data[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):
b = binascii.a2b_base64(line)
res += b
self.assertEqual(res, self.data)
# Test base64 with just invalid characters, which should return
# empty strings. TBD: shouldn't it raise an exception instead ?
self.assertEqual(binascii.a2b_base64(fillers), b'')
def test_uu(self):
MAX_UU = 45
lines = []
for i in range(0, len(self.data), MAX_UU):
b = self.data[i:i+MAX_UU]
a = binascii.b2a_uu(b)
lines.append(a)
res = bytes()
for line in lines:
b = binascii.a2b_uu(line)
res += b
self.assertEqual(res, self.data)
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"!")
def test_crc32(self):
crc = binascii.crc32(b"Test the CRC-32 of")
crc = binascii.crc32(b" this string.", crc)
self.assertEqual(crc, 1571220330)
self.assertRaises(TypeError, binascii.crc32)
# The hqx test is in test_binhex.py
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(s)
u = binascii.a2b_hex(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')
self.assertEqual(binascii.hexlify(b'a'), b'61')
def test_qp(self):
# A test for SF bug 534347 (segfaults without the proper fix)
try:
binascii.a2b_qp("", **{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.
for n in ['b2a_qp', 'a2b_hex', 'b2a_base64', 'a2b_uu', 'a2b_qp',
'b2a_hex', 'unhexlify', 'hexlify', 'crc32', 'b2a_hqx',
'a2b_hqx', 'a2b_base64', 'rlecode_hqx', 'b2a_uu',
'rledecode_hqx']:
f = getattr(binascii, n)
try:
f(b'')
except SystemError as err:
self.fail("%s(b'') raises SystemError: %s" % (n, err))
binascii.crc_hqx(b'', 0)
def test_no_binary_strings(self):
# b2a_ must not accept strings
for f in (binascii.b2a_uu, binascii.b2a_base64,
binascii.b2a_hqx, binascii.b2a_qp,
binascii.hexlify, binascii.rlecode_hqx,
binascii.crc_hqx, binascii.crc32):
self.assertRaises(TypeError, f, "test")
def test_main():
support.run_unittest(BinASCIITest)
if __name__ == "__main__":
test_main()
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