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# Copyright (c) 2001-2010 Twisted Matrix Laboratories.
# See LICENSE for details.

import StringIO
import sys

# Twisted Imports
from twisted.trial import unittest
from twisted.spread import banana
from twisted.python import failure
from twisted.internet import protocol, main


class MathTestCase(unittest.TestCase):
    def testInt2b128(self):
        funkylist = range(0,100) + range(1000,1100) + range(1000000,1000100) + [1024 **10l]
        for i in funkylist:
            x = StringIO.StringIO()
            banana.int2b128(i, x.write)
            v = x.getvalue()
            y = banana.b1282int(v)
            assert y == i, "y = %s; i = %s" % (y,i)

class BananaTestCase(unittest.TestCase):

    encClass = banana.Banana

    def setUp(self):
        self.io = StringIO.StringIO()
        self.enc = self.encClass()
        self.enc.makeConnection(protocol.FileWrapper(self.io))
        self.enc._selectDialect("none")
        self.enc.expressionReceived = self.putResult

    def putResult(self, result):
        self.result = result

    def tearDown(self):
        self.enc.connectionLost(failure.Failure(main.CONNECTION_DONE))
        del self.enc

    def testString(self):
        self.enc.sendEncoded("hello")
        l = []
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == 'hello'

    def test_int(self):
        """
        A positive integer less than 2 ** 32 should round-trip through
        banana without changing value and should come out represented
        as an C{int} (regardless of the type which was encoded).
        """
        for value in (10151, 10151L):
            self.enc.sendEncoded(value)
            self.enc.dataReceived(self.io.getvalue())
            self.assertEquals(self.result, 10151)
            self.assertIsInstance(self.result, int)


    def test_largeLong(self):
        """
        Integers greater than 2 ** 32 and less than -2 ** 32 should
        round-trip through banana without changing value and should
        come out represented as C{int} instances if the value fits
        into that type on the receiving platform.
        """
        for exp in (32, 64, 128, 256):
            for add in (0, 1):
                m = 2 ** exp + add
                for n in (m, -m-1):
                    self.io.truncate(0)
                    self.enc.sendEncoded(n)
                    self.enc.dataReceived(self.io.getvalue())
                    self.assertEquals(self.result, n)
                    if n > sys.maxint or n < -sys.maxint - 1:
                        self.assertIsInstance(self.result, long)
                    else:
                        self.assertIsInstance(self.result, int)


    def _getSmallest(self):
        # How many bytes of prefix our implementation allows
        bytes = self.enc.prefixLimit
        # How many useful bits we can extract from that based on Banana's
        # base-128 representation.
        bits = bytes * 7
        # The largest number we _should_ be able to encode
        largest = 2 ** bits - 1
        # The smallest number we _shouldn't_ be able to encode
        smallest = largest + 1
        return smallest


    def test_encodeTooLargeLong(self):
        """
        Test that a long above the implementation-specific limit is rejected
        as too large to be encoded.
        """
        smallest = self._getSmallest()
        self.assertRaises(banana.BananaError, self.enc.sendEncoded, smallest)


    def test_decodeTooLargeLong(self):
        """
        Test that a long above the implementation specific limit is rejected
        as too large to be decoded.
        """
        smallest = self._getSmallest()
        self.enc.setPrefixLimit(self.enc.prefixLimit * 2)
        self.enc.sendEncoded(smallest)
        encoded = self.io.getvalue()
        self.io.truncate(0)
        self.enc.setPrefixLimit(self.enc.prefixLimit / 2)

        self.assertRaises(banana.BananaError, self.enc.dataReceived, encoded)


    def _getLargest(self):
        return -self._getSmallest()


    def test_encodeTooSmallLong(self):
        """
        Test that a negative long below the implementation-specific limit is
        rejected as too small to be encoded.
        """
        largest = self._getLargest()
        self.assertRaises(banana.BananaError, self.enc.sendEncoded, largest)


    def test_decodeTooSmallLong(self):
        """
        Test that a negative long below the implementation specific limit is
        rejected as too small to be decoded.
        """
        largest = self._getLargest()
        self.enc.setPrefixLimit(self.enc.prefixLimit * 2)
        self.enc.sendEncoded(largest)
        encoded = self.io.getvalue()
        self.io.truncate(0)
        self.enc.setPrefixLimit(self.enc.prefixLimit / 2)

        self.assertRaises(banana.BananaError, self.enc.dataReceived, encoded)


    def testNegativeLong(self):
        self.enc.sendEncoded(-1015l)
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == -1015l, "should be -1015l, got %s" % self.result

    def testInteger(self):
        self.enc.sendEncoded(1015)
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == 1015, "should be 1015, got %s" % self.result

    def testNegative(self):
        self.enc.sendEncoded(-1015)
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == -1015, "should be -1015, got %s" % self.result

    def testFloat(self):
        self.enc.sendEncoded(1015.)
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == 1015.

    def testList(self):
        foo = [1, 2, [3, 4], [30.5, 40.2], 5, ["six", "seven", ["eight", 9]], [10], []]
        self.enc.sendEncoded(foo)
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == foo, "%s!=%s" % (repr(self.result), repr(self.result))

    def testPartial(self):
        foo = [1, 2, [3, 4], [30.5, 40.2], 5,
               ["six", "seven", ["eight", 9]], [10],
               # TODO: currently the C implementation's a bit buggy...
               sys.maxint * 3l, sys.maxint * 2l, sys.maxint * -2l]
        self.enc.sendEncoded(foo)
        for byte in self.io.getvalue():
            self.enc.dataReceived(byte)
        assert self.result == foo, "%s!=%s" % (repr(self.result), repr(foo))

    def feed(self, data):
        for byte in data:
            self.enc.dataReceived(byte)
    def testOversizedList(self):
        data = '\x02\x01\x01\x01\x01\x80'
        # list(size=0x0101010102, about 4.3e9)
        self.failUnlessRaises(banana.BananaError, self.feed, data)
    def testOversizedString(self):
        data = '\x02\x01\x01\x01\x01\x82'
        # string(size=0x0101010102, about 4.3e9)
        self.failUnlessRaises(banana.BananaError, self.feed, data)

    def testCrashString(self):
        crashString = '\x00\x00\x00\x00\x04\x80'
        # string(size=0x0400000000, about 17.2e9)

        #  cBanana would fold that into a 32-bit 'int', then try to allocate
        #  a list with PyList_New(). cBanana ignored the NULL return value,
        #  so it would segfault when trying to free the imaginary list.

        # This variant doesn't segfault straight out in my environment.
        # Instead, it takes up large amounts of CPU and memory...
        #crashString = '\x00\x00\x00\x00\x01\x80'
        # print repr(crashString)
        #self.failUnlessRaises(Exception, self.enc.dataReceived, crashString)
        try:
            # should now raise MemoryError
            self.enc.dataReceived(crashString)
        except banana.BananaError:
            pass

    def testCrashNegativeLong(self):
        # There was a bug in cBanana which relied on negating a negative integer
        # always giving a postive result, but for the lowest possible number in
        # 2s-complement arithmetic, that's not true, i.e.
        #     long x = -2147483648;
        #     long y = -x;
        #     x == y;  /* true! */
        # (assuming 32-bit longs)
        self.enc.sendEncoded(-2147483648)
        self.enc.dataReceived(self.io.getvalue())
        assert self.result == -2147483648, "should be -2147483648, got %s" % self.result


    def test_sizedIntegerTypes(self):
        """
        Test that integers below the maximum C{INT} token size cutoff are
        serialized as C{INT} or C{NEG} and that larger integers are
        serialized as C{LONGINT} or C{LONGNEG}.
        """
        def encoded(n):
            self.io.seek(0)
            self.io.truncate()
            self.enc.sendEncoded(n)
            return self.io.getvalue()

        baseIntIn = +2147483647
        baseNegIn = -2147483648

        baseIntOut = '\x7f\x7f\x7f\x07\x81'
        self.assertEqual(encoded(baseIntIn - 2), '\x7d' + baseIntOut)
        self.assertEqual(encoded(baseIntIn - 1), '\x7e' + baseIntOut)
        self.assertEqual(encoded(baseIntIn - 0), '\x7f' + baseIntOut)

        baseLongIntOut = '\x00\x00\x00\x08\x85'
        self.assertEqual(encoded(baseIntIn + 1), '\x00' + baseLongIntOut)
        self.assertEqual(encoded(baseIntIn + 2), '\x01' + baseLongIntOut)
        self.assertEqual(encoded(baseIntIn + 3), '\x02' + baseLongIntOut)

        baseNegOut = '\x7f\x7f\x7f\x07\x83'
        self.assertEqual(encoded(baseNegIn + 2), '\x7e' + baseNegOut)
        self.assertEqual(encoded(baseNegIn + 1), '\x7f' + baseNegOut)
        self.assertEqual(encoded(baseNegIn + 0), '\x00\x00\x00\x00\x08\x83')

        baseLongNegOut = '\x00\x00\x00\x08\x86'
        self.assertEqual(encoded(baseNegIn - 1), '\x01' + baseLongNegOut)
        self.assertEqual(encoded(baseNegIn - 2), '\x02' + baseLongNegOut)
        self.assertEqual(encoded(baseNegIn - 3), '\x03' + baseLongNegOut)



class GlobalCoderTests(unittest.TestCase):
    """
    Tests for the free functions L{banana.encode} and L{banana.decode}.
    """
    def test_statelessDecode(self):
        """
        Test that state doesn't carry over between calls to L{banana.decode}.
        """
        # Banana encoding of 2 ** 449
        undecodable = '\x7f' * 65 + '\x85'
        self.assertRaises(banana.BananaError, banana.decode, undecodable)

        # Banana encoding of 1
        decodable = '\x01\x81'
        self.assertEqual(banana.decode(decodable), 1)

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