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[3.13] gh-125346: Add more base64 tests (GH-141061) (GH-141130) by miss-islington · Pull Request #141133 · python/cpython · GitHub

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[3.13] gh-125346: Add more base64 tests (GH-141061) (GH-141130) #141133

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Merged
serhiy-storchaka merged 1 commit into from
Nov 6, 2025
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[3.13] gh-125346: Add more base64 tests (GH-141061) (GH-141130) #141133

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65 changes: 40 additions & 25 deletions Lib/test/test_base64.py
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Original file line number Diff line number Diff line change
Expand Up @@ -200,18 +200,6 @@ def test_b64decode(self):
self.check_other_types(base64.b64decode, b"YWJj", b"abc")
self.check_decode_type_errors(base64.b64decode)

# Test with arbitrary alternative characters
tests_altchars = {(b'01a*b$cd', b'*$'): b'\xd3V\xbeo\xf7\x1d',
}
for (data, altchars), res in tests_altchars.items():
data_str = data.decode('ascii')
altchars_str = altchars.decode('ascii')

eq(base64.b64decode(data, altchars=altchars), res)
eq(base64.b64decode(data_str, altchars=altchars), res)
eq(base64.b64decode(data, altchars=altchars_str), res)
eq(base64.b64decode(data_str, altchars=altchars_str), res)

# Test standard alphabet
for data, res in tests.items():
eq(base64.standard_b64decode(data), res)
Expand All @@ -232,6 +220,20 @@ def test_b64decode(self):
b'\xd3V\xbeo\xf7\x1d')
self.check_decode_type_errors(base64.urlsafe_b64decode)

def test_b64decode_altchars(self):
# Test with arbitrary alternative characters
eq = self.assertEqual
res = b'\xd3V\xbeo\xf7\x1d'
for altchars in b'*$', b'+/', b'/+', b'+_', b'-+', b'-/', b'/_':
data = b'01a%cb%ccd' % tuple(altchars)
data_str = data.decode('ascii')
altchars_str = altchars.decode('ascii')

eq(base64.b64decode(data, altchars=altchars), res)
eq(base64.b64decode(data_str, altchars=altchars), res)
eq(base64.b64decode(data, altchars=altchars_str), res)
eq(base64.b64decode(data_str, altchars=altchars_str), res)

def test_b64decode_padding_error(self):
self.assertRaises(binascii.Error, base64.b64decode, b'abc')
self.assertRaises(binascii.Error, base64.b64decode, 'abc')
Expand Down Expand Up @@ -264,9 +266,12 @@ def test_b64decode_invalid_chars(self):
base64.b64decode(bstr.decode('ascii'), validate=True)

# Normal alphabet characters not discarded when alternative given
res = b'\xFB\xEF\xBE\xFF\xFF\xFF'
self.assertEqual(base64.b64decode(b'++[[//]]', b'[]'), res)
self.assertEqual(base64.urlsafe_b64decode(b'++--//__'), res)
res = b'\xfb\xef\xff'
self.assertEqual(base64.b64decode(b'++//', validate=True), res)
self.assertEqual(base64.b64decode(b'++//', '-_', validate=True), res)
self.assertEqual(base64.b64decode(b'--__', '-_', validate=True), res)
self.assertEqual(base64.urlsafe_b64decode(b'++//'), res)
self.assertEqual(base64.urlsafe_b64decode(b'--__'), res)

def test_b32encode(self):
eq = self.assertEqual
Expand Down Expand Up @@ -321,23 +326,33 @@ def test_b32decode_casefold(self):
self.assertRaises(binascii.Error, base64.b32decode, b'me======')
self.assertRaises(binascii.Error, base64.b32decode, 'me======')

def test_b32decode_map01(self):
# Mapping zero and one
eq(base64.b32decode(b'MLO23456'), b'b\xdd\xad\xf3\xbe')
eq(base64.b32decode('MLO23456'), b'b\xdd\xad\xf3\xbe')

map_tests = {(b'M1023456', b'L'): b'b\xdd\xad\xf3\xbe',
(b'M1023456', b'I'): b'b\x1d\xad\xf3\xbe',
}
for (data, map01), res in map_tests.items():
data_str = data.decode('ascii')
eq = self.assertEqual
res_L = b'b\xdd\xad\xf3\xbe'
res_I = b'b\x1d\xad\xf3\xbe'
eq(base64.b32decode(b'MLO23456'), res_L)
eq(base64.b32decode('MLO23456'), res_L)
eq(base64.b32decode(b'MIO23456'), res_I)
eq(base64.b32decode('MIO23456'), res_I)
self.assertRaises(binascii.Error, base64.b32decode, b'M1023456')
self.assertRaises(binascii.Error, base64.b32decode, b'M1O23456')
self.assertRaises(binascii.Error, base64.b32decode, b'ML023456')
self.assertRaises(binascii.Error, base64.b32decode, b'MI023456')

data = b'M1023456'
data_str = data.decode('ascii')
for map01, res in [(b'L', res_L), (b'I', res_I)]:
map01_str = map01.decode('ascii')

eq(base64.b32decode(data, map01=map01), res)
eq(base64.b32decode(data_str, map01=map01), res)
eq(base64.b32decode(data, map01=map01_str), res)
eq(base64.b32decode(data_str, map01=map01_str), res)
self.assertRaises(binascii.Error, base64.b32decode, data)
self.assertRaises(binascii.Error, base64.b32decode, data_str)

eq(base64.b32decode(b'M1O23456', map01=map01), res)
eq(base64.b32decode(b'M%c023456' % map01, map01=map01), res)
eq(base64.b32decode(b'M%cO23456' % map01, map01=map01), res)

def test_b32decode_error(self):
tests = [b'abc', b'ABCDEF==', b'==ABCDEF']
Expand Down
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