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# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
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# See LICENSE for details.
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from twisted.trial import unittest
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import cStringIO as StringIO
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from twisted.spread import banana
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from twisted.python import failure
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from twisted.internet import protocol, main
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class MathTestCase(unittest.TestCase):
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def testInt2b128(self):
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funkylist = range(0,100) + range(1000,1100) + range(1000000,1000100) + [1024 **10l]
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x = StringIO.StringIO()
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banana.int2b128(i, x.write)
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y = banana.b1282int(v)
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assert y == i, "y = %s; i = %s" % (y,i)
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class BananaTestCase(unittest.TestCase):
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encClass = banana.Banana
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self.io = StringIO.StringIO()
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self.enc = self.encClass()
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self.enc.makeConnection(protocol.FileWrapper(self.io))
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self.enc._selectDialect("none")
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self.enc.expressionReceived = self.putResult
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def putResult(self, result):
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self.enc.connectionLost(failure.Failure(main.CONNECTION_DONE))
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self.enc.sendEncoded("hello")
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == 'hello'
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self.enc.sendEncoded(1015l)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == 1015l, "should be 1015l, got %s" % self.result
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def test_largeLong(self):
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Test that various longs greater than 2 ** 32 - 1 round-trip through
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for exp in (32, 64, 128, 256):
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self.enc.sendEncoded(n)
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self.enc.dataReceived(self.io.getvalue())
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self.assertEqual(self.result, n)
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def _getSmallest(self):
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# How many bytes of prefix our implementation allows
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bytes = self.enc.prefixLimit
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# How many useful bits we can extract from that based on Banana's
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# base-128 representation.
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# The largest number we _should_ be able to encode
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largest = 2 ** bits - 1
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# The smallest number we _shouldn't_ be able to encode
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smallest = largest + 1
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def test_encodeTooLargeLong(self):
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Test that a long above the implementation-specific limit is rejected
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as too large to be encoded.
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smallest = self._getSmallest()
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self.assertRaises(banana.BananaError, self.enc.sendEncoded, smallest)
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def test_decodeTooLargeLong(self):
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Test that a long above the implementation specific limit is rejected
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as too large to be decoded.
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smallest = self._getSmallest()
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self.enc.setPrefixLimit(self.enc.prefixLimit * 2)
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self.enc.sendEncoded(smallest)
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encoded = self.io.getvalue()
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self.enc.setPrefixLimit(self.enc.prefixLimit / 2)
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self.assertRaises(banana.BananaError, self.enc.dataReceived, encoded)
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def _getLargest(self):
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return -self._getSmallest()
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def test_encodeTooSmallLong(self):
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Test that a negative long below the implementation-specific limit is
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rejected as too small to be encoded.
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largest = self._getLargest()
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self.assertRaises(banana.BananaError, self.enc.sendEncoded, largest)
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def test_decodeTooSmallLong(self):
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Test that a negative long below the implementation specific limit is
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rejected as too small to be decoded.
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largest = self._getLargest()
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self.enc.setPrefixLimit(self.enc.prefixLimit * 2)
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self.enc.sendEncoded(largest)
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encoded = self.io.getvalue()
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self.enc.setPrefixLimit(self.enc.prefixLimit / 2)
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self.assertRaises(banana.BananaError, self.enc.dataReceived, encoded)
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def testNegativeLong(self):
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self.enc.sendEncoded(-1015l)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == -1015l, "should be -1015l, got %s" % self.result
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def testInteger(self):
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self.enc.sendEncoded(1015)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == 1015, "should be 1015, got %s" % self.result
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def testNegative(self):
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self.enc.sendEncoded(-1015)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == -1015, "should be -1015, got %s" % self.result
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self.enc.sendEncoded(1015.)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == 1015.
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foo = [1, 2, [3, 4], [30.5, 40.2], 5, ["six", "seven", ["eight", 9]], [10], []]
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self.enc.sendEncoded(foo)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == foo, "%s!=%s" % (repr(self.result), repr(self.result))
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def testPartial(self):
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foo = [1, 2, [3, 4], [30.5, 40.2], 5,
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["six", "seven", ["eight", 9]], [10],
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# TODO: currently the C implementation's a bit buggy...
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sys.maxint * 3l, sys.maxint * 2l, sys.maxint * -2l]
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self.enc.sendEncoded(foo)
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for byte in self.io.getvalue():
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self.enc.dataReceived(byte)
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assert self.result == foo, "%s!=%s" % (repr(self.result), repr(foo))
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def feed(self, data):
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self.enc.dataReceived(byte)
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def testOversizedList(self):
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data = '\x02\x01\x01\x01\x01\x80'
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# list(size=0x0101010102, about 4.3e9)
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self.failUnlessRaises(banana.BananaError, self.feed, data)
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def testOversizedString(self):
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data = '\x02\x01\x01\x01\x01\x82'
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# string(size=0x0101010102, about 4.3e9)
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self.failUnlessRaises(banana.BananaError, self.feed, data)
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def testCrashString(self):
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crashString = '\x00\x00\x00\x00\x04\x80'
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# string(size=0x0400000000, about 17.2e9)
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# cBanana would fold that into a 32-bit 'int', then try to allocate
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# a list with PyList_New(). cBanana ignored the NULL return value,
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# so it would segfault when trying to free the imaginary list.
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# This variant doesn't segfault straight out in my environment.
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# Instead, it takes up large amounts of CPU and memory...
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#crashString = '\x00\x00\x00\x00\x01\x80'
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# print repr(crashString)
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#self.failUnlessRaises(Exception, self.enc.dataReceived, crashString)
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# should now raise MemoryError
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self.enc.dataReceived(crashString)
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except banana.BananaError:
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def testCrashNegativeLong(self):
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# There was a bug in cBanana which relied on negating a negative integer
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# always giving a postive result, but for the lowest possible number in
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# 2s-complement arithmetic, that's not true, i.e.
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# long x = -2147483648;
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# x == y; /* true! */
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# (assuming 32-bit longs)
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self.enc.sendEncoded(-2147483648)
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self.enc.dataReceived(self.io.getvalue())
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assert self.result == -2147483648, "should be -2147483648, got %s" % self.result
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class GlobalCoderTests(unittest.TestCase):
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Tests for the free functions L{banana.encode} and L{banana.decode}.
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def test_statelessDecode(self):
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Test that state doesn't carry over between calls to L{banana.decode}.
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# Banana encoding of 2 ** 449
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undecodable = '\x7f' * 65 + '\x85'
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self.assertRaises(banana.BananaError, banana.decode, undecodable)
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# Banana encoding of 1
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decodable = '\x01\x81'
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self.assertEqual(banana.decode(decodable), 1)
added
removed
src/twisted/test/test_banana.py
