"""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()