import array

import unittest

import struct

import warnings

from functools import wraps

from test.test_support import TestFailed, verbose, run_unittest

import sys

ISBIGENDIAN = sys.byteorder == "big"

IS32BIT = sys.maxsize == 0x7fffffff

del sys

try:

    import _struct

except ImportError:

    PY_STRUCT_RANGE_CHECKING = 0

    PY_STRUCT_OVERFLOW_MASKING = 1

    PY_STRUCT_FLOAT_COERCE = 2

else:

    PY_STRUCT_RANGE_CHECKING = getattr(_struct, '_PY_STRUCT_RANGE_CHECKING', 0)

    PY_STRUCT_OVERFLOW_MASKING = getattr(_struct, '_PY_STRUCT_OVERFLOW_MASKING', 0)

    PY_STRUCT_FLOAT_COERCE = getattr(_struct, '_PY_STRUCT_FLOAT_COERCE', 0)

def string_reverse(s):

    return "".join(reversed(s))

def bigendian_to_native(value):

    if ISBIGENDIAN:

        return value

    else:

        return string_reverse(value)

def with_warning_restore(func):

    @wraps(func)

    def decorator(*args, **kw):

        with warnings.catch_warnings():

            # We need this function to warn every time, so stick an

            # unqualifed 'always' at the head of the filter list

            warnings.simplefilter("always")

            warnings.filterwarnings("error", category=DeprecationWarning)

            return func(*args, **kw)

    return decorator

@with_warning_restore

def deprecated_err(func, *args):

    try:

        func(*args)

    except (struct.error, TypeError):

        pass

    except DeprecationWarning:

        if not PY_STRUCT_OVERFLOW_MASKING:

            raise TestFailed, "%s%s expected to raise DeprecationWarning" % (

                func.__name__, args)

    else:

        raise TestFailed, "%s%s did not raise error" % (

            func.__name__, args)

class StructTest(unittest.TestCase):

    @with_warning_restore

    def check_float_coerce(self, format, number):

        # SF bug 1530559. struct.pack raises TypeError where it used to convert.

        if PY_STRUCT_FLOAT_COERCE == 2:

            # Test for pre-2.5 struct module

            packed = struct.pack(format, number)

            floored = struct.unpack(format, packed)[0]

            self.assertEqual(floored, int(number),

                             "did not correcly coerce float to int")

            return

        try:

            struct.pack(format, number)

        except (struct.error, TypeError):

            if PY_STRUCT_FLOAT_COERCE:

                self.fail("expected DeprecationWarning for float coerce")

        except DeprecationWarning:

            if not PY_STRUCT_FLOAT_COERCE:

                self.fail("expected to raise struct.error for float coerce")

        else:

            self.fail("did not raise error for float coerce")

    def test_isbigendian(self):

        self.assertEqual((struct.pack('=i', 1)[0] == chr(0)), ISBIGENDIAN)

    def test_consistence(self):

        self.assertRaises(struct.error, struct.calcsize, 'Z')

        sz = struct.calcsize('i')

        self.assertEqual(sz * 3, struct.calcsize('iii'))

        fmt = 'cbxxxxxxhhhhiillffd?'

        fmt3 = '3c3b18x12h6i6l6f3d3?'

        sz = struct.calcsize(fmt)

        sz3 = struct.calcsize(fmt3)

        self.assertEqual(sz * 3, sz3)

        self.assertRaises(struct.error, struct.pack, 'iii', 3)

        self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3)

        self.assertRaises(struct.error, struct.pack, 'i', 'foo')

        self.assertRaises(struct.error, struct.pack, 'P', 'foo')

        self.assertRaises(struct.error, struct.unpack, 'd', 'flap')

        s = struct.pack('ii', 1, 2)

        self.assertRaises(struct.error, struct.unpack, 'iii', s)

        self.assertRaises(struct.error, struct.unpack, 'i', s)

    def test_transitiveness(self):

        c = 'a'

        b = 1

        h = 255

        i = 65535

        l = 65536

        f = 3.1415

        d = 3.1415

        t = True

        for prefix in ('', '@', '<', '>', '=', '!'):

            for format in ('xcbhilfd?', 'xcBHILfd?'):

                format = prefix + format

                s = struct.pack(format, c, b, h, i, l, f, d, t)

                cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s)

                self.assertEqual(cp, c)

                self.assertEqual(bp, b)

                self.assertEqual(hp, h)

                self.assertEqual(ip, i)

                self.assertEqual(lp, l)

                self.assertEqual(int(100 * fp), int(100 * f))

                self.assertEqual(int(100 * dp), int(100 * d))

                self.assertEqual(tp, t)

    def test_new_features(self):

        # Test some of the new features in detail

        # (format, argument, big-endian result, little-endian result, asymmetric)

        tests = [

            ('c', 'a', 'a', 'a', 0),

            ('xc', 'a', '\0a', '\0a', 0),

            ('cx', 'a', 'a\0', 'a\0', 0),

            ('s', 'a', 'a', 'a', 0),

            ('0s', 'helloworld', '', '', 1),

            ('1s', 'helloworld', 'h', 'h', 1),

            ('9s', 'helloworld', 'helloworl', 'helloworl', 1),

            ('10s', 'helloworld', 'helloworld', 'helloworld', 0),

            ('11s', 'helloworld', 'helloworld\0', 'helloworld\0', 1),

            ('20s', 'helloworld', 'helloworld'+10*'\0', 'helloworld'+10*'\0', 1),

            ('b', 7, '\7', '\7', 0),

            ('b', -7, '\371', '\371', 0),

            ('B', 7, '\7', '\7', 0),

            ('B', 249, '\371', '\371', 0),

            ('h', 700, '\002\274', '\274\002', 0),

            ('h', -700, '\375D', 'D\375', 0),

            ('H', 700, '\002\274', '\274\002', 0),

            ('H', 0x10000-700, '\375D', 'D\375', 0),

            ('i', 70000000, '\004,\035\200', '\200\035,\004', 0),

            ('i', -70000000, '\373\323\342\200', '\200\342\323\373', 0),

            ('I', 70000000L, '\004,\035\200', '\200\035,\004', 0),

            ('I', 0x100000000L-70000000, '\373\323\342\200', '\200\342\323\373', 0),

            ('l', 70000000, '\004,\035\200', '\200\035,\004', 0),

            ('l', -70000000, '\373\323\342\200', '\200\342\323\373', 0),

            ('L', 70000000L, '\004,\035\200', '\200\035,\004', 0),

            ('L', 0x100000000L-70000000, '\373\323\342\200', '\200\342\323\373', 0),

            ('f', 2.0, '@\000\000\000', '\000\000\000@', 0),

            ('d', 2.0, '@\000\000\000\000\000\000\000',

                       '\000\000\000\000\000\000\000@', 0),

            ('f', -2.0, '\300\000\000\000', '\000\000\000\300', 0),

            ('d', -2.0, '\300\000\000\000\000\000\000\000',

                       '\000\000\000\000\000\000\000\300', 0),

                ('?', 0, '\0', '\0', 0),

                ('?', 3, '\1', '\1', 1),

                ('?', True, '\1', '\1', 0),

                ('?', [], '\0', '\0', 1),

                ('?', (1,), '\1', '\1', 1),

        ]

        for fmt, arg, big, lil, asy in tests:

            for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),

                                ('='+fmt, ISBIGENDIAN and big or lil)]:

                res = struct.pack(xfmt, arg)

                self.assertEqual(res, exp)

                self.assertEqual(struct.calcsize(xfmt), len(res))

                rev = struct.unpack(xfmt, res)[0]

                if rev != arg:

                    self.assert_(asy)

    def test_native_qQ(self):

        # can't pack -1 as unsigned regardless

        self.assertRaises((struct.error, TypeError), struct.pack, "Q", -1)

        # can't pack string as 'q' regardless

        self.assertRaises(struct.error, struct.pack, "q", "a")

        # ditto, but 'Q'

        self.assertRaises(struct.error, struct.pack, "Q", "a")

        try:

            struct.pack("q", 5)

        except struct.error:

            # does not have native q/Q

            pass

        else:

            bytes = struct.calcsize('q')

            # The expected values here are in big-endian format, primarily

            # because I'm on a little-endian machine and so this is the

            # clearest way (for me) to force the code to get exercised.

            for format, input, expected in (

                    ('q', -1, '\xff' * bytes),

                    ('q', 0, '\x00' * bytes),

                    ('Q', 0, '\x00' * bytes),

                    ('q', 1L, '\x00' * (bytes-1) + '\x01'),

                    ('Q', (1L << (8*bytes))-1, '\xff' * bytes),

                    ('q', (1L << (8*bytes-1))-1, '\x7f' + '\xff' * (bytes - 1))):

                got = struct.pack(format, input)

                native_expected = bigendian_to_native(expected)

                self.assertEqual(got, native_expected)

                retrieved = struct.unpack(format, got)[0]

                self.assertEqual(retrieved, input)

    def test_standard_integers(self):

        # Standard integer tests (bBhHiIlLqQ).

        import binascii

        class IntTester(unittest.TestCase):

            # XXX Most std integer modes fail to test for out-of-range.

            # The "i" and "l" codes appear to range-check OK on 32-bit boxes, but

            # fail to check correctly on some 64-bit ones (Tru64 Unix + Compaq C

            # reported by Mark Favas).

            BUGGY_RANGE_CHECK = "bBhHiIlL"

            def __init__(self, formatpair, bytesize):

                self.assertEqual(len(formatpair), 2)

                self.formatpair = formatpair

                for direction in "<>!=":

                    for code in formatpair:

                        format = direction + code

                        self.assertEqual(struct.calcsize(format), bytesize)

                self.bytesize = bytesize

                self.bitsize = bytesize * 8

                self.signed_code, self.unsigned_code = formatpair

                self.unsigned_min = 0

                self.unsigned_max = 2L**self.bitsize - 1

                self.signed_min = -(2L**(self.bitsize-1))

                self.signed_max = 2L**(self.bitsize-1) - 1

            def test_one(self, x, pack=struct.pack,

                                  unpack=struct.unpack,

                                  unhexlify=binascii.unhexlify):

                # Try signed.

                code = self.signed_code

                if self.signed_min <= x <= self.signed_max:

                    # Try big-endian.

                    expected = long(x)

                    if x < 0:

                        expected += 1L << self.bitsize

                        self.assert_(expected > 0)

                    expected = hex(expected)[2:-1] # chop "0x" and trailing 'L'

                    if len(expected) & 1:

                        expected = "0" + expected

                    expected = unhexlify(expected)

                    expected = "\x00" * (self.bytesize - len(expected)) + expected

                    # Pack work?

                    format = ">" + code

                    got = pack(format, x)

                    self.assertEqual(got, expected)

                    # Unpack work?

                    retrieved = unpack(format, got)[0]

                    self.assertEqual(x, retrieved)

                    # Adding any byte should cause a "too big" error.

                    self.assertRaises((struct.error, TypeError), unpack, format,

                                                                 '\x01' + got)

                    # Try little-endian.

                    format = "<" + code

                    expected = string_reverse(expected)

                    # Pack work?

                    got = pack(format, x)

                    self.assertEqual(got, expected)

                    # Unpack work?

                    retrieved = unpack(format, got)[0]

                    self.assertEqual(x, retrieved)

                    # Adding any byte should cause a "too big" error.

                    self.assertRaises((struct.error, TypeError), unpack, format,

                                                                 '\x01' + got)

                else:

                    # x is out of range -- verify pack realizes that.

                    if not PY_STRUCT_RANGE_CHECKING and code in self.BUGGY_RANGE_CHECK:

                        if verbose:

                            print "Skipping buggy range check for code", code

                    else:

                        deprecated_err(pack, ">" + code, x)

                        deprecated_err(pack, "<" + code, x)

                # Much the same for unsigned.

                code = self.unsigned_code

                if self.unsigned_min <= x <= self.unsigned_max:

                    # Try big-endian.

                    format = ">" + code

                    expected = long(x)

                    expected = hex(expected)[2:-1] # chop "0x" and trailing 'L'

                    if len(expected) & 1:

                        expected = "0" + expected

                    expected = unhexlify(expected)

                    expected = "\x00" * (self.bytesize - len(expected)) + expected

                    # Pack work?

                    got = pack(format, x)

                    self.assertEqual(got, expected)

                    # Unpack work?

                    retrieved = unpack(format, got)[0]

                    self.assertEqual(x, retrieved)

                    # Adding any byte should cause a "too big" error.

                    self.assertRaises((struct.error, TypeError), unpack, format,

                                                                 '\x01' + got)

                    # Try little-endian.

                    format = "<" + code

                    expected = string_reverse(expected)

                    # Pack work?

                    got = pack(format, x)

                    self.assertEqual(got, expected)

                    # Unpack work?

                    retrieved = unpack(format, got)[0]

                    self.assertEqual(x, retrieved)

                    # Adding any byte should cause a "too big" error.

                    self.assertRaises((struct.error, TypeError), unpack, format,

                                                                 '\x01' + got)

                else:

                    # x is out of range -- verify pack realizes that.

                    if not PY_STRUCT_RANGE_CHECKING and code in self.BUGGY_RANGE_CHECK:

                        if verbose:

                            print "Skipping buggy range check for code", code

                    else:

                        deprecated_err(pack, ">" + code, x)

                        deprecated_err(pack, "<" + code, x)

            def run(self):

                from random import randrange

                # Create all interesting powers of 2.

                values = []

                for exp in range(self.bitsize + 3):

                    values.append(1L << exp)

                # Add some random values.

                for i in range(self.bitsize):

                    val = 0L

                    for j in range(self.bytesize):

                        val = (val << 8) | randrange(256)

                    values.append(val)

                # Try all those, and their negations, and +-1 from them.  Note

                # that this tests all power-of-2 boundaries in range, and a few out

                # of range, plus +-(2**n +- 1).

                for base in values:

                    for val in -base, base:

                        for incr in -1, 0, 1:

                            x = val + incr

                            try:

                                x = int(x)

                            except OverflowError:

                                pass

                            self.test_one(x)

                # Some error cases.

                for direction in "<>":

                    for code in self.formatpair:

                        for badobject in "a string", 3+42j, randrange:

                            self.assertRaises((struct.error, TypeError),

                                               struct.pack, direction + code,

                                               badobject)

        for args in [("bB", 1),

                     ("hH", 2),

                     ("iI", 4),

                     ("lL", 4),

                     ("qQ", 8)]:

            t = IntTester(*args)

            t.run()

    def test_p_code(self):

        # Test p ("Pascal string") code.

        for code, input, expected, expectedback in [

                ('p','abc', '\x00', ''),

                ('1p', 'abc', '\x00', ''),

                ('2p', 'abc', '\x01a', 'a'),

                ('3p', 'abc', '\x02ab', 'ab'),

                ('4p', 'abc', '\x03abc', 'abc'),

                ('5p', 'abc', '\x03abc\x00', 'abc'),

                ('6p', 'abc', '\x03abc\x00\x00', 'abc'),

                ('1000p', 'x'*1000, '\xff' + 'x'*999, 'x'*255)]:

            got = struct.pack(code, input)

            self.assertEqual(got, expected)

            (got,) = struct.unpack(code, got)

            self.assertEqual(got, expectedback)

    def test_705836(self):

        # SF bug 705836.  "<f" and ">f" had a severe rounding bug, where a carry

        # from the low-order discarded bits could propagate into the exponent

        # field, causing the result to be wrong by a factor of 2.

        import math

        for base in range(1, 33):

            # smaller <- largest representable float less than base.

            delta = 0.5

            while base - delta / 2.0 != base:

                delta /= 2.0

            smaller = base - delta

            # Packing this rounds away a solid string of trailing 1 bits.

            packed = struct.pack("<f", smaller)

            unpacked = struct.unpack("<f", packed)[0]

            # This failed at base = 2, 4, and 32, with unpacked = 1, 2, and

            # 16, respectively.

            self.assertEqual(base, unpacked)

            bigpacked = struct.pack(">f", smaller)

            self.assertEqual(bigpacked, string_reverse(packed))

            unpacked = struct.unpack(">f", bigpacked)[0]

            self.assertEqual(base, unpacked)

        # Largest finite IEEE single.

        big = (1 << 24) - 1

        big = math.ldexp(big, 127 - 23)

        packed = struct.pack(">f", big)

        unpacked = struct.unpack(">f", packed)[0]

        self.assertEqual(big, unpacked)

        # The same, but tack on a 1 bit so it rounds up to infinity.

        big = (1 << 25) - 1

        big = math.ldexp(big, 127 - 24)

        self.assertRaises(OverflowError, struct.pack, ">f", big)

    if PY_STRUCT_RANGE_CHECKING:

        def test_1229380(self):

            # SF bug 1229380. No struct.pack exception for some out of

            # range integers

            import sys

            for endian in ('', '>', '<'):

                for cls in (int, long):

                    for fmt in ('B', 'H', 'I', 'L'):

                        deprecated_err(struct.pack, endian + fmt, cls(-1))

                    deprecated_err(struct.pack, endian + 'B', cls(300))

                    deprecated_err(struct.pack, endian + 'H', cls(70000))

                deprecated_err(struct.pack, endian + 'I', sys.maxint * 4L)

                deprecated_err(struct.pack, endian + 'L', sys.maxint * 4L)

    def XXXtest_1530559(self):

        # XXX This is broken: see the bug report

        # SF bug 1530559. struct.pack raises TypeError where it used to convert.

        for endian in ('', '>', '<'):

            for fmt in ('B', 'H', 'I', 'L', 'b', 'h', 'i', 'l'):

                self.check_float_coerce(endian + fmt, 1.0)

                self.check_float_coerce(endian + fmt, 1.5)

    def test_unpack_from(self):

        test_string = 'abcd01234'

        fmt = '4s'

        s = struct.Struct(fmt)

        for cls in (str, buffer):

            data = cls(test_string)

            self.assertEqual(s.unpack_from(data), ('abcd',))

            self.assertEqual(s.unpack_from(data, 2), ('cd01',))

            self.assertEqual(s.unpack_from(data, 4), ('0123',))

            for i in xrange(6):

                self.assertEqual(s.unpack_from(data, i), (data[i:i+4],))

            for i in xrange(6, len(test_string) + 1):

                self.assertRaises(struct.error, s.unpack_from, data, i)

        for cls in (str, buffer):

            data = cls(test_string)

            self.assertEqual(struct.unpack_from(fmt, data), ('abcd',))

            self.assertEqual(struct.unpack_from(fmt, data, 2), ('cd01',))

            self.assertEqual(struct.unpack_from(fmt, data, 4), ('0123',))

            for i in xrange(6):

                self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))

            for i in xrange(6, len(test_string) + 1):

                self.assertRaises(struct.error, struct.unpack_from, fmt, data, i)

    def test_pack_into(self):

        test_string = 'Reykjavik rocks, eow!'

        writable_buf = array.array('c', ' '*100)

        fmt = '21s'

        s = struct.Struct(fmt)

        # Test without offset

        s.pack_into(writable_buf, 0, test_string)

        from_buf = writable_buf.tostring()[:len(test_string)]

        self.assertEqual(from_buf, test_string)

        # Test with offset.

        s.pack_into(writable_buf, 10, test_string)

        from_buf = writable_buf.tostring()[:len(test_string)+10]

        self.assertEqual(from_buf, test_string[:10] + test_string)

        # Go beyond boundaries.

        small_buf = array.array('c', ' '*10)

        self.assertRaises(struct.error, s.pack_into, small_buf, 0, test_string)

        self.assertRaises(struct.error, s.pack_into, small_buf, 2, test_string)

    def test_pack_into_fn(self):

        test_string = 'Reykjavik rocks, eow!'

        writable_buf = array.array('c', ' '*100)

        fmt = '21s'

        pack_into = lambda *args: struct.pack_into(fmt, *args)

        # Test without offset.

        pack_into(writable_buf, 0, test_string)

        from_buf = writable_buf.tostring()[:len(test_string)]

        self.assertEqual(from_buf, test_string)

        # Test with offset.

        pack_into(writable_buf, 10, test_string)

        from_buf = writable_buf.tostring()[:len(test_string)+10]

        self.assertEqual(from_buf, test_string[:10] + test_string)

        # Go beyond boundaries.

        small_buf = array.array('c', ' '*10)

        self.assertRaises(struct.error, pack_into, small_buf, 0, test_string)

        self.assertRaises(struct.error, pack_into, small_buf, 2, test_string)