"""Test the binascii C module."""

from test import test_support

import unittest

import binascii

class BinASCIITest(unittest.TestCase):

    # Create binary test data

    data = "The quick brown fox jumps over the lazy dog.\r\n"

    # Be slow so we don't depend on other modules

    data += "".join(map(chr, xrange(256)))

    data += "\r\nHello world.\n"

    def test_exceptions(self):

        # Check module exceptions

        self.assert_(issubclass(binascii.Error, Exception))

        self.assert_(issubclass(binascii.Incomplete, Exception))

    def test_functions(self):

        # Check presence of all functions

        funcs = []

        for suffix in "base64", "hqx", "uu", "hex":

            prefixes = ["a2b_", "b2a_"]

            if suffix == "hqx":

                prefixes.extend(["crc_", "rlecode_", "rledecode_"])

            for prefix in prefixes:

                name = prefix + suffix

                self.assert_(callable(getattr(binascii, name)))

                self.assertRaises(TypeError, getattr(binascii, name))

        for name in ("hexlify", "unhexlify"):

            self.assert_(callable(getattr(binascii, name)))

            self.assertRaises(TypeError, getattr(binascii, name))

    def test_base64valid(self):

        # Test base64 with valid data

        MAX_BASE64 = 57

        lines = []

        for i in range(0, len(self.data), MAX_BASE64):

            b = self.data[i:i+MAX_BASE64]

            a = binascii.b2a_base64(b)

            lines.append(a)

        res = ""

        for line in lines:

            b = binascii.a2b_base64(line)

            res = res + b

        self.assertEqual(res, self.data)

    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.data[i:i+MAX_BASE64]

            a = binascii.b2a_base64(b)

            lines.append(a)

        fillers = ""

        valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/"

        for i in xrange(256):

            c = chr(i)

            if c not in valid:

                fillers += c

        def addnoise(line):

            noise = fillers

            ratio = len(line) // len(noise)

            res = ""

            while line and noise:

                if len(line) // len(noise) > ratio:

                    c, line = line[0], line[1:]

                else:

                    c, noise = noise[0], noise[1:]

                res += c

            return res + noise + line

        res = ""

        for line in map(addnoise, lines):

            b = binascii.a2b_base64(line)

            res += b

        self.assertEqual(res, self.data)

        # Test base64 with just invalid characters, which should return

        # empty strings. TBD: shouldn't it raise an exception instead ?

        self.assertEqual(binascii.a2b_base64(fillers), '')

    def test_uu(self):

        MAX_UU = 45

        lines = []

        for i in range(0, len(self.data), MAX_UU):

            b = self.data[i:i+MAX_UU]

            a = binascii.b2a_uu(b)

            lines.append(a)

        res = ""

        for line in lines:

            b = binascii.a2b_uu(line)

            res += b

        self.assertEqual(res, self.data)

        self.assertEqual(binascii.a2b_uu("\x7f"), "\x00"*31)

        self.assertEqual(binascii.a2b_uu("\x80"), "\x00"*32)

        self.assertEqual(binascii.a2b_uu("\xff"), "\x00"*31)

        self.assertRaises(binascii.Error, binascii.a2b_uu, "\xff\x00")

        self.assertRaises(binascii.Error, binascii.a2b_uu, "!!!!")

        self.assertRaises(binascii.Error, binascii.b2a_uu, 46*"!")

    def test_crc32(self):

        crc = binascii.crc32("Test the CRC-32 of")

        crc = binascii.crc32(" this string.", crc)

        self.assertEqual(crc, 1571220330)

        self.assertRaises(TypeError, binascii.crc32)

    # The hqx test is in test_binhex.py

    def test_hex(self):

        # test hexlification

        s = '{s\005\000\000\000worldi\002\000\000\000s\005\000\000\000helloi\001\000\000\0000'

        t = binascii.b2a_hex(s)

        u = binascii.a2b_hex(t)

        self.assertEqual(s, u)

        self.assertRaises(TypeError, binascii.a2b_hex, t[:-1])

        self.assertRaises(TypeError, binascii.a2b_hex, t[:-1] + 'q')

        # Verify the treatment of Unicode strings

        if test_support.have_unicode:

            self.assertEqual(binascii.hexlify(unicode('a', 'ascii')), '61')

    def test_qp(self):

        # A test for SF bug 534347 (segfaults without the proper fix)

        try:

            binascii.a2b_qp("", **{1:1})

        except TypeError:

            pass

        else:

            self.fail("binascii.a2b_qp(**{1:1}) didn't raise TypeError")

        self.assertEqual(binascii.a2b_qp("= "), "= ")

        self.assertEqual(binascii.a2b_qp("=="), "=")

        self.assertEqual(binascii.a2b_qp("=AX"), "=AX")

        self.assertRaises(TypeError, binascii.b2a_qp, foo="bar")

        self.assertEqual(binascii.a2b_qp("=00\r\n=00"), "\x00\r\n\x00")

        self.assertEqual(

            binascii.b2a_qp("\xff\r\n\xff\n\xff"),

            "=FF\r\n=FF\r\n=FF"

        )

        self.assertEqual(

            binascii.b2a_qp("0"*75+"\xff\r\n\xff\r\n\xff"),

            "0"*75+"=\r\n=FF\r\n=FF\r\n=FF"

        )

    def test_empty_string(self):

        # A test for SF bug #1022953.  Make sure SystemError is not raised.

        for n in ['b2a_qp', 'a2b_hex', 'b2a_base64', 'a2b_uu', 'a2b_qp',

                  'b2a_hex', 'unhexlify', 'hexlify', 'crc32', 'b2a_hqx',

                  'a2b_hqx', 'a2b_base64', 'rlecode_hqx', 'b2a_uu',

                  'rledecode_hqx']:

            f = getattr(binascii, n)

            f('')

        binascii.crc_hqx('', 0)

def test_main():

    test_support.run_unittest(BinASCIITest)

if __name__ == "__main__":

    test_main()