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https://github.com/tahoe-lafs/tahoe-lafs.git
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67 lines
2.4 KiB
Python
67 lines
2.4 KiB
Python
import random, unittest
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from allmydata.util import base62, mathutil
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def insecurerandstr(n):
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return ''.join(map(chr, map(random.randrange, [0]*n, [256]*n)))
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class T(unittest.TestCase):
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def _test_num_octets_that_encode_to_this_many_chars(self, chars, octets):
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assert base62.num_octets_that_encode_to_this_many_chars(chars) == octets, "%s != %s <- %s" % (octets, base62.num_octets_that_encode_to_this_many_chars(chars), chars)
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def _test_ende(self, bs):
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ascii=base62.b2a(bs)
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bs2=base62.a2b(ascii)
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assert bs2 == bs, "bs2: %s:%s, bs: %s:%s, ascii: %s:%s" % (len(bs2), `bs2`, len(bs), `bs`, len(ascii), `ascii`)
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def test_num_octets_that_encode_to_this_many_chars(self):
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return self._test_num_octets_that_encode_to_this_many_chars(2, 1)
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return self._test_num_octets_that_encode_to_this_many_chars(3, 2)
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return self._test_num_octets_that_encode_to_this_many_chars(5, 3)
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return self._test_num_octets_that_encode_to_this_many_chars(6, 4)
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def test_ende_0x00(self):
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return self._test_ende('\x00')
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def test_ende_0x01(self):
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return self._test_ende('\x01')
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def test_ende_0x0100(self):
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return self._test_ende('\x01\x00')
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def test_ende_0x000000(self):
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return self._test_ende('\x00\x00\x00')
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def test_ende_0x010000(self):
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return self._test_ende('\x01\x00\x00')
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def test_ende_randstr(self):
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return self._test_ende(insecurerandstr(2**4))
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def test_ende_longrandstr(self):
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return self._test_ende(insecurerandstr(random.randrange(0, 2**10)))
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def test_odd_sizes(self):
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for j in range(2**6):
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lib = random.randrange(1, 2**8)
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numos = mathutil.div_ceil(lib, 8)
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bs = insecurerandstr(numos)
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# zero-out unused least-sig bits
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if lib%8:
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b=ord(bs[-1])
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b = b >> (8 - (lib%8))
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b = b << (8 - (lib%8))
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bs = bs[:-1] + chr(b)
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asl = base62.b2a_l(bs, lib)
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assert len(asl) == base62.num_chars_that_this_many_octets_encode_to(numos) # the size of the base-62 encoding must be just right
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bs2l = base62.a2b_l(asl, lib)
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assert len(bs2l) == numos # the size of the result must be just right
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assert bs == bs2l
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def suite():
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suite = unittest.makeSuite(T, 'test')
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return suite
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if __name__ == "__main__":
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unittest.main()
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