tests/test-cbor.py

documentation: add some internals documentation about bid merge

This is an important algorithm that was only documented on the wiki so far.

Some update to the algorithm (and associated doc) is to expected in the future
since the bid merge algorithm is bug-ridden when it comes to file deletion comes
to play.

Differential Revision: https://phab.mercurial-scm.org/D8711

from __future__ import absolute_import

import os
import sys
import unittest

# TODO migrate to canned cbor test strings and stop using thirdparty.cbor
tpp = os.path.normpath(
    os.path.join(os.path.dirname(__file__), '..', 'mercurial', 'thirdparty')
)
if not os.path.exists(tpp):
    # skip, not in a repo
    sys.exit(80)
sys.path[0:0] = [tpp]
import cbor

del sys.path[0]

from mercurial.utils import cborutil


class TestCase(unittest.TestCase):
    if not getattr(unittest.TestCase, 'assertRaisesRegex', False):
        # Python 3.7 deprecates the regex*p* version, but 2.7 lacks
        # the regex version.
        assertRaisesRegex = (  # camelcase-required
            unittest.TestCase.assertRaisesRegexp
        )


def loadit(it):
    return cbor.loads(b''.join(it))


class BytestringTests(TestCase):
    def testsimple(self):
        self.assertEqual(
            list(cborutil.streamencode(b'foobar')), [b'\x46', b'foobar']
        )

        self.assertEqual(loadit(cborutil.streamencode(b'foobar')), b'foobar')

        self.assertEqual(cborutil.decodeall(b'\x46foobar'), [b'foobar'])

        self.assertEqual(
            cborutil.decodeall(b'\x46foobar\x45fizbi'), [b'foobar', b'fizbi']
        )

    def testlong(self):
        source = b'x' * 1048576

        self.assertEqual(loadit(cborutil.streamencode(source)), source)

        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

    def testfromiter(self):
        # This is the example from RFC 7049 Section 2.2.2.
        source = [b'\xaa\xbb\xcc\xdd', b'\xee\xff\x99']

        self.assertEqual(
            list(cborutil.streamencodebytestringfromiter(source)),
            [
                b'\x5f',
                b'\x44',
                b'\xaa\xbb\xcc\xdd',
                b'\x43',
                b'\xee\xff\x99',
                b'\xff',
            ],
        )

        self.assertEqual(
            loadit(cborutil.streamencodebytestringfromiter(source)),
            b''.join(source),
        )

        self.assertEqual(
            cborutil.decodeall(
                b'\x5f\x44\xaa\xbb\xcc\xdd' b'\x43\xee\xff\x99\xff'
            ),
            [b'\xaa\xbb\xcc\xdd', b'\xee\xff\x99', b''],
        )

        for i, chunk in enumerate(
            cborutil.decodeall(
                b'\x5f\x44\xaa\xbb\xcc\xdd' b'\x43\xee\xff\x99\xff'
            )
        ):
            self.assertIsInstance(chunk, cborutil.bytestringchunk)

            if i == 0:
                self.assertTrue(chunk.isfirst)
            else:
                self.assertFalse(chunk.isfirst)

            if i == 2:
                self.assertTrue(chunk.islast)
            else:
                self.assertFalse(chunk.islast)

    def testfromiterlarge(self):
        source = [b'a' * 16, b'b' * 128, b'c' * 1024, b'd' * 1048576]

        self.assertEqual(
            loadit(cborutil.streamencodebytestringfromiter(source)),
            b''.join(source),
        )

    def testindefinite(self):
        source = b'\x00\x01\x02\x03' + b'\xff' * 16384

        it = cborutil.streamencodeindefinitebytestring(source, chunksize=2)

        self.assertEqual(next(it), b'\x5f')
        self.assertEqual(next(it), b'\x42')
        self.assertEqual(next(it), b'\x00\x01')
        self.assertEqual(next(it), b'\x42')
        self.assertEqual(next(it), b'\x02\x03')
        self.assertEqual(next(it), b'\x42')
        self.assertEqual(next(it), b'\xff\xff')

        dest = b''.join(
            cborutil.streamencodeindefinitebytestring(source, chunksize=42)
        )
        self.assertEqual(cbor.loads(dest), source)

        self.assertEqual(b''.join(cborutil.decodeall(dest)), source)

        for chunk in cborutil.decodeall(dest):
            self.assertIsInstance(chunk, cborutil.bytestringchunk)
            self.assertIn(len(chunk), (0, 8, 42))

        encoded = b'\x5f\xff'
        b = cborutil.decodeall(encoded)
        self.assertEqual(b, [b''])
        self.assertTrue(b[0].isfirst)
        self.assertTrue(b[0].islast)

    def testdecodevariouslengths(self):
        for i in (0, 1, 22, 23, 24, 25, 254, 255, 256, 65534, 65535, 65536):
            source = b'x' * i
            encoded = b''.join(cborutil.streamencode(source))

            if len(source) < 24:
                hlen = 1
            elif len(source) < 256:
                hlen = 2
            elif len(source) < 65536:
                hlen = 3
            elif len(source) < 1048576:
                hlen = 5

            self.assertEqual(
                cborutil.decodeitem(encoded),
                (True, source, hlen + len(source), cborutil.SPECIAL_NONE),
            )

    def testpartialdecode(self):
        encoded = b''.join(cborutil.streamencode(b'foobar'))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -6, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -5, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:6]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:7]),
            (True, b'foobar', 7, cborutil.SPECIAL_NONE),
        )

    def testpartialdecodevariouslengths(self):
        lens = [
            2,
            3,
            10,
            23,
            24,
            25,
            31,
            100,
            254,
            255,
            256,
            257,
            16384,
            65534,
            65535,
            65536,
            65537,
            131071,
            131072,
            131073,
            1048575,
            1048576,
            1048577,
        ]

        for size in lens:
            if size < 24:
                hlen = 1
            elif size < 2 ** 8:
                hlen = 2
            elif size < 2 ** 16:
                hlen = 3
            elif size < 2 ** 32:
                hlen = 5
            else:
                assert False

            source = b'x' * size
            encoded = b''.join(cborutil.streamencode(source))

            res = cborutil.decodeitem(encoded[0:1])

            if hlen > 1:
                self.assertEqual(
                    res, (False, None, -(hlen - 1), cborutil.SPECIAL_NONE)
                )
            else:
                self.assertEqual(
                    res,
                    (False, None, -(size + hlen - 1), cborutil.SPECIAL_NONE),
                )

            # Decoding partial header reports remaining header size.
            for i in range(hlen - 1):
                self.assertEqual(
                    cborutil.decodeitem(encoded[0 : i + 1]),
                    (False, None, -(hlen - i - 1), cborutil.SPECIAL_NONE),
                )

            # Decoding complete header reports item size.
            self.assertEqual(
                cborutil.decodeitem(encoded[0:hlen]),
                (False, None, -size, cborutil.SPECIAL_NONE),
            )

            # Decoding single byte after header reports item size - 1
            self.assertEqual(
                cborutil.decodeitem(encoded[0 : hlen + 1]),
                (False, None, -(size - 1), cborutil.SPECIAL_NONE),
            )

            # Decoding all but the last byte reports -1 needed.
            self.assertEqual(
                cborutil.decodeitem(encoded[0 : hlen + size - 1]),
                (False, None, -1, cborutil.SPECIAL_NONE),
            )

            # Decoding last byte retrieves value.
            self.assertEqual(
                cborutil.decodeitem(encoded[0 : hlen + size]),
                (True, source, hlen + size, cborutil.SPECIAL_NONE),
            )

    def testindefinitepartialdecode(self):
        encoded = b''.join(
            cborutil.streamencodebytestringfromiter([b'foobar', b'biz'])
        )

        # First item should be begin of bytestring special.
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (True, None, 1, cborutil.SPECIAL_START_INDEFINITE_BYTESTRING),
        )

        # Second item should be the first chunk. But only available when
        # we give it 7 bytes (1 byte header + 6 byte chunk).
        self.assertEqual(
            cborutil.decodeitem(encoded[1:2]),
            (False, None, -6, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[1:3]),
            (False, None, -5, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[1:4]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[1:5]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[1:6]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[1:7]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )

        self.assertEqual(
            cborutil.decodeitem(encoded[1:8]),
            (True, b'foobar', 7, cborutil.SPECIAL_NONE),
        )

        # Third item should be second chunk. But only available when
        # we give it 4 bytes (1 byte header + 3 byte chunk).
        self.assertEqual(
            cborutil.decodeitem(encoded[8:9]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[8:10]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[8:11]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )

        self.assertEqual(
            cborutil.decodeitem(encoded[8:12]),
            (True, b'biz', 4, cborutil.SPECIAL_NONE),
        )

        # Fourth item should be end of indefinite stream marker.
        self.assertEqual(
            cborutil.decodeitem(encoded[12:13]),
            (True, None, 1, cborutil.SPECIAL_INDEFINITE_BREAK),
        )

        # Now test the behavior when going through the decoder.

        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:1]), (False, 1, 0)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:2]), (False, 1, 6)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:3]), (False, 1, 5)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:4]), (False, 1, 4)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:5]), (False, 1, 3)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:6]), (False, 1, 2)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:7]), (False, 1, 1)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:8]), (True, 8, 0)
        )

        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:9]), (True, 8, 3)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:10]), (True, 8, 2)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:11]), (True, 8, 1)
        )
        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:12]), (True, 12, 0)
        )

        self.assertEqual(
            cborutil.sansiodecoder().decode(encoded[0:13]), (True, 13, 0)
        )

        decoder = cborutil.sansiodecoder()
        decoder.decode(encoded[0:8])
        values = decoder.getavailable()
        self.assertEqual(values, [b'foobar'])
        self.assertTrue(values[0].isfirst)
        self.assertFalse(values[0].islast)

        self.assertEqual(decoder.decode(encoded[8:12]), (True, 4, 0))
        values = decoder.getavailable()
        self.assertEqual(values, [b'biz'])
        self.assertFalse(values[0].isfirst)
        self.assertFalse(values[0].islast)

        self.assertEqual(decoder.decode(encoded[12:]), (True, 1, 0))
        values = decoder.getavailable()
        self.assertEqual(values, [b''])
        self.assertFalse(values[0].isfirst)
        self.assertTrue(values[0].islast)


class StringTests(TestCase):
    def testdecodeforbidden(self):
        encoded = b'\x63foo'
        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'string major type not supported'
        ):
            cborutil.decodeall(encoded)


class IntTests(TestCase):
    def testsmall(self):
        self.assertEqual(list(cborutil.streamencode(0)), [b'\x00'])
        self.assertEqual(cborutil.decodeall(b'\x00'), [0])

        self.assertEqual(list(cborutil.streamencode(1)), [b'\x01'])
        self.assertEqual(cborutil.decodeall(b'\x01'), [1])

        self.assertEqual(list(cborutil.streamencode(2)), [b'\x02'])
        self.assertEqual(cborutil.decodeall(b'\x02'), [2])

        self.assertEqual(list(cborutil.streamencode(3)), [b'\x03'])
        self.assertEqual(cborutil.decodeall(b'\x03'), [3])

        self.assertEqual(list(cborutil.streamencode(4)), [b'\x04'])
        self.assertEqual(cborutil.decodeall(b'\x04'), [4])

        # Multiple value decode works.
        self.assertEqual(
            cborutil.decodeall(b'\x00\x01\x02\x03\x04'), [0, 1, 2, 3, 4]
        )

    def testnegativesmall(self):
        self.assertEqual(list(cborutil.streamencode(-1)), [b'\x20'])
        self.assertEqual(cborutil.decodeall(b'\x20'), [-1])

        self.assertEqual(list(cborutil.streamencode(-2)), [b'\x21'])
        self.assertEqual(cborutil.decodeall(b'\x21'), [-2])

        self.assertEqual(list(cborutil.streamencode(-3)), [b'\x22'])
        self.assertEqual(cborutil.decodeall(b'\x22'), [-3])

        self.assertEqual(list(cborutil.streamencode(-4)), [b'\x23'])
        self.assertEqual(cborutil.decodeall(b'\x23'), [-4])

        self.assertEqual(list(cborutil.streamencode(-5)), [b'\x24'])
        self.assertEqual(cborutil.decodeall(b'\x24'), [-5])

        # Multiple value decode works.
        self.assertEqual(
            cborutil.decodeall(b'\x20\x21\x22\x23\x24'), [-1, -2, -3, -4, -5]
        )

    def testrange(self):
        for i in range(-70000, 70000, 10):
            encoded = b''.join(cborutil.streamencode(i))

            self.assertEqual(encoded, cbor.dumps(i))
            self.assertEqual(cborutil.decodeall(encoded), [i])

    def testdecodepartialubyte(self):
        encoded = b''.join(cborutil.streamencode(250))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, 250, 2, cborutil.SPECIAL_NONE),
        )

    def testdecodepartialbyte(self):
        encoded = b''.join(cborutil.streamencode(-42))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, -42, 2, cborutil.SPECIAL_NONE),
        )

    def testdecodepartialushort(self):
        encoded = b''.join(cborutil.streamencode(2 ** 15))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (True, 2 ** 15, 3, cborutil.SPECIAL_NONE),
        )

    def testdecodepartialshort(self):
        encoded = b''.join(cborutil.streamencode(-1024))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (True, -1024, 3, cborutil.SPECIAL_NONE),
        )

    def testdecodepartialulong(self):
        encoded = b''.join(cborutil.streamencode(2 ** 28))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (True, 2 ** 28, 5, cborutil.SPECIAL_NONE),
        )

    def testdecodepartiallong(self):
        encoded = b''.join(cborutil.streamencode(-1048580))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (True, -1048580, 5, cborutil.SPECIAL_NONE),
        )

    def testdecodepartialulonglong(self):
        encoded = b''.join(cborutil.streamencode(2 ** 32))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -8, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -7, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -6, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -5, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:6]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:7]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:8]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:9]),
            (True, 2 ** 32, 9, cborutil.SPECIAL_NONE),
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'input data not fully consumed'
        ):
            cborutil.decodeall(encoded[0:1])

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'input data not fully consumed'
        ):
            cborutil.decodeall(encoded[0:2])

    def testdecodepartiallonglong(self):
        encoded = b''.join(cborutil.streamencode(-7000000000))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -8, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -7, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -6, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -5, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:6]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:7]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:8]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:9]),
            (True, -7000000000, 9, cborutil.SPECIAL_NONE),
        )


class ArrayTests(TestCase):
    def testempty(self):
        self.assertEqual(list(cborutil.streamencode([])), [b'\x80'])
        self.assertEqual(loadit(cborutil.streamencode([])), [])

        self.assertEqual(cborutil.decodeall(b'\x80'), [[]])

    def testbasic(self):
        source = [b'foo', b'bar', 1, -10]

        chunks = [b'\x84', b'\x43', b'foo', b'\x43', b'bar', b'\x01', b'\x29']

        self.assertEqual(list(cborutil.streamencode(source)), chunks)

        self.assertEqual(cborutil.decodeall(b''.join(chunks)), [source])

    def testemptyfromiter(self):
        self.assertEqual(
            b''.join(cborutil.streamencodearrayfromiter([])), b'\x9f\xff'
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'indefinite length uint not allowed'
        ):
            cborutil.decodeall(b'\x9f\xff')

    def testfromiter1(self):
        source = [b'foo']

        self.assertEqual(
            list(cborutil.streamencodearrayfromiter(source)),
            [b'\x9f', b'\x43', b'foo', b'\xff',],
        )

        dest = b''.join(cborutil.streamencodearrayfromiter(source))
        self.assertEqual(cbor.loads(dest), source)

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'indefinite length uint not allowed'
        ):
            cborutil.decodeall(dest)

    def testtuple(self):
        source = (b'foo', None, 42)
        encoded = b''.join(cborutil.streamencode(source))

        self.assertEqual(cbor.loads(encoded), list(source))

        self.assertEqual(cborutil.decodeall(encoded), [list(source)])

    def testpartialdecode(self):
        source = list(range(4))
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (True, 4, 1, cborutil.SPECIAL_START_ARRAY),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, 4, 1, cborutil.SPECIAL_START_ARRAY),
        )

        source = list(range(23))
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (True, 23, 1, cborutil.SPECIAL_START_ARRAY),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, 23, 1, cborutil.SPECIAL_START_ARRAY),
        )

        source = list(range(24))
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, 24, 2, cborutil.SPECIAL_START_ARRAY),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (True, 24, 2, cborutil.SPECIAL_START_ARRAY),
        )

        source = list(range(256))
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (True, 256, 3, cborutil.SPECIAL_START_ARRAY),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (True, 256, 3, cborutil.SPECIAL_START_ARRAY),
        )

    def testnested(self):
        source = [[], [], [[], [], []]]
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

        source = [True, None, [True, 0, 2], [None], [], [[[]], -87]]
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

        # A set within an array.
        source = [None, {b'foo', b'bar', None, False}, set()]
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

        # A map within an array.
        source = [None, {}, {b'foo': b'bar', True: False}, [{}]]
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

    def testindefinitebytestringvalues(self):
        # Single value array whose value is an empty indefinite bytestring.
        encoded = b'\x81\x5f\x40\xff'

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError,
            'indefinite length bytestrings not ' 'allowed as array values',
        ):
            cborutil.decodeall(encoded)


class SetTests(TestCase):
    def testempty(self):
        self.assertEqual(
            list(cborutil.streamencode(set())), [b'\xd9\x01\x02', b'\x80',]
        )

        self.assertEqual(cborutil.decodeall(b'\xd9\x01\x02\x80'), [set()])

    def testset(self):
        source = {b'foo', None, 42}
        encoded = b''.join(cborutil.streamencode(source))

        self.assertEqual(cbor.loads(encoded), source)

        self.assertEqual(cborutil.decodeall(encoded), [source])

    def testinvalidtag(self):
        # Must use array to encode sets.
        encoded = b'\xd9\x01\x02\xa0'

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError,
            'expected array after finite set ' 'semantic tag',
        ):
            cborutil.decodeall(encoded)

    def testpartialdecode(self):
        # Semantic tag item will be 3 bytes. Set header will be variable
        # depending on length.
        encoded = b''.join(cborutil.streamencode({i for i in range(23)}))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (True, 23, 4, cborutil.SPECIAL_START_SET),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (True, 23, 4, cborutil.SPECIAL_START_SET),
        )

        encoded = b''.join(cborutil.streamencode({i for i in range(24)}))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (True, 24, 5, cborutil.SPECIAL_START_SET),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:6]),
            (True, 24, 5, cborutil.SPECIAL_START_SET),
        )

        encoded = b''.join(cborutil.streamencode({i for i in range(256)}))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:6]),
            (True, 256, 6, cborutil.SPECIAL_START_SET),
        )

    def testinvalidvalue(self):
        encoded = b''.join(
            [
                b'\xd9\x01\x02',  # semantic tag
                b'\x81',  # array of size 1
                b'\x5f\x43foo\xff',  # indefinite length bytestring "foo"
            ]
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError,
            'indefinite length bytestrings not ' 'allowed as set values',
        ):
            cborutil.decodeall(encoded)

        encoded = b''.join([b'\xd9\x01\x02', b'\x81', b'\x80',])  # empty array

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'collections not allowed as set values'
        ):
            cborutil.decodeall(encoded)

        encoded = b''.join([b'\xd9\x01\x02', b'\x81', b'\xa0',])  # empty map

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'collections not allowed as set values'
        ):
            cborutil.decodeall(encoded)

        encoded = b''.join(
            [
                b'\xd9\x01\x02',
                b'\x81',
                b'\xd9\x01\x02\x81\x01',  # set with integer 1
            ]
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'collections not allowed as set values'
        ):
            cborutil.decodeall(encoded)


class BoolTests(TestCase):
    def testbasic(self):
        self.assertEqual(list(cborutil.streamencode(True)), [b'\xf5'])
        self.assertEqual(list(cborutil.streamencode(False)), [b'\xf4'])

        self.assertIs(loadit(cborutil.streamencode(True)), True)
        self.assertIs(loadit(cborutil.streamencode(False)), False)

        self.assertEqual(cborutil.decodeall(b'\xf4'), [False])
        self.assertEqual(cborutil.decodeall(b'\xf5'), [True])

        self.assertEqual(
            cborutil.decodeall(b'\xf4\xf5\xf5\xf4'), [False, True, True, False]
        )


class NoneTests(TestCase):
    def testbasic(self):
        self.assertEqual(list(cborutil.streamencode(None)), [b'\xf6'])

        self.assertIs(loadit(cborutil.streamencode(None)), None)

        self.assertEqual(cborutil.decodeall(b'\xf6'), [None])
        self.assertEqual(cborutil.decodeall(b'\xf6\xf6'), [None, None])


class MapTests(TestCase):
    def testempty(self):
        self.assertEqual(list(cborutil.streamencode({})), [b'\xa0'])
        self.assertEqual(loadit(cborutil.streamencode({})), {})

        self.assertEqual(cborutil.decodeall(b'\xa0'), [{}])

    def testemptyindefinite(self):
        self.assertEqual(
            list(cborutil.streamencodemapfromiter([])), [b'\xbf', b'\xff']
        )

        self.assertEqual(loadit(cborutil.streamencodemapfromiter([])), {})

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'indefinite length uint not allowed'
        ):
            cborutil.decodeall(b'\xbf\xff')

    def testone(self):
        source = {b'foo': b'bar'}
        self.assertEqual(
            list(cborutil.streamencode(source)),
            [b'\xa1', b'\x43', b'foo', b'\x43', b'bar'],
        )

        self.assertEqual(loadit(cborutil.streamencode(source)), source)

        self.assertEqual(cborutil.decodeall(b'\xa1\x43foo\x43bar'), [source])

    def testmultiple(self):
        source = {
            b'foo': b'bar',
            b'baz': b'value1',
        }

        self.assertEqual(loadit(cborutil.streamencode(source)), source)

        self.assertEqual(
            loadit(cborutil.streamencodemapfromiter(source.items())), source
        )

        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

    def testcomplex(self):
        source = {
            b'key': 1,
            2: -10,
        }

        self.assertEqual(loadit(cborutil.streamencode(source)), source)

        self.assertEqual(
            loadit(cborutil.streamencodemapfromiter(source.items())), source
        )

        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

    def testnested(self):
        source = {b'key1': None, b'key2': {b'sub1': b'sub2'}, b'sub2': {}}
        encoded = b''.join(cborutil.streamencode(source))

        self.assertEqual(cborutil.decodeall(encoded), [source])

        source = {
            b'key1': [],
            b'key2': [None, False],
            b'key3': {b'foo', b'bar'},
            b'key4': {},
        }
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(cborutil.decodeall(encoded), [source])

    def testillegalkey(self):
        encoded = b''.join(
            [
                # map header + len 1
                b'\xa1',
                # indefinite length bytestring "foo" in key position
                b'\x5f\x03foo\xff',
            ]
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError,
            'indefinite length bytestrings not ' 'allowed as map keys',
        ):
            cborutil.decodeall(encoded)

        encoded = b''.join([b'\xa1', b'\x80', b'\x43foo',])  # empty array

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'collections not supported as map keys'
        ):
            cborutil.decodeall(encoded)

    def testillegalvalue(self):
        encoded = b''.join(
            [
                b'\xa1',  # map headers
                b'\x43foo',  # key
                b'\x5f\x03bar\xff',  # indefinite length value
            ]
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError,
            'indefinite length bytestrings not ' 'allowed as map values',
        ):
            cborutil.decodeall(encoded)

    def testpartialdecode(self):
        source = {b'key1': b'value1'}
        encoded = b''.join(cborutil.streamencode(source))

        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (True, 1, 1, cborutil.SPECIAL_START_MAP),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, 1, 1, cborutil.SPECIAL_START_MAP),
        )

        source = {b'key%d' % i: None for i in range(23)}
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (True, 23, 1, cborutil.SPECIAL_START_MAP),
        )

        source = {b'key%d' % i: None for i in range(24)}
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (True, 24, 2, cborutil.SPECIAL_START_MAP),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (True, 24, 2, cborutil.SPECIAL_START_MAP),
        )

        source = {b'key%d' % i: None for i in range(256)}
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (True, 256, 3, cborutil.SPECIAL_START_MAP),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (True, 256, 3, cborutil.SPECIAL_START_MAP),
        )

        source = {b'key%d' % i: None for i in range(65536)}
        encoded = b''.join(cborutil.streamencode(source))
        self.assertEqual(
            cborutil.decodeitem(encoded[0:1]),
            (False, None, -4, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:2]),
            (False, None, -3, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:3]),
            (False, None, -2, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:4]),
            (False, None, -1, cborutil.SPECIAL_NONE),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:5]),
            (True, 65536, 5, cborutil.SPECIAL_START_MAP),
        )
        self.assertEqual(
            cborutil.decodeitem(encoded[0:6]),
            (True, 65536, 5, cborutil.SPECIAL_START_MAP),
        )


class SemanticTagTests(TestCase):
    def testdecodeforbidden(self):
        for i in range(500):
            if i == cborutil.SEMANTIC_TAG_FINITE_SET:
                continue

            tag = cborutil.encodelength(cborutil.MAJOR_TYPE_SEMANTIC, i)

            encoded = tag + cborutil.encodelength(cborutil.MAJOR_TYPE_UINT, 42)

            # Partial decode is incomplete.
            if i < 24:
                pass
            elif i < 256:
                self.assertEqual(
                    cborutil.decodeitem(encoded[0:1]),
                    (False, None, -1, cborutil.SPECIAL_NONE),
                )
            elif i < 65536:
                self.assertEqual(
                    cborutil.decodeitem(encoded[0:1]),
                    (False, None, -2, cborutil.SPECIAL_NONE),
                )
                self.assertEqual(
                    cborutil.decodeitem(encoded[0:2]),
                    (False, None, -1, cborutil.SPECIAL_NONE),
                )

            with self.assertRaisesRegex(
                cborutil.CBORDecodeError, r'semantic tag \d+ not allowed'
            ):
                cborutil.decodeitem(encoded)


class SpecialTypesTests(TestCase):
    def testforbiddentypes(self):
        for i in range(256):
            if i == cborutil.SUBTYPE_FALSE:
                continue
            elif i == cborutil.SUBTYPE_TRUE:
                continue
            elif i == cborutil.SUBTYPE_NULL:
                continue

            encoded = cborutil.encodelength(cborutil.MAJOR_TYPE_SPECIAL, i)

            with self.assertRaisesRegex(
                cborutil.CBORDecodeError, r'special type \d+ not allowed'
            ):
                cborutil.decodeitem(encoded)


class SansIODecoderTests(TestCase):
    def testemptyinput(self):
        decoder = cborutil.sansiodecoder()
        self.assertEqual(decoder.decode(b''), (False, 0, 0))


class BufferingDecoderTests(TestCase):
    def testsimple(self):
        source = [
            b'foobar',
            b'x' * 128,
            {b'foo': b'bar'},
            True,
            False,
            None,
            [None] * 128,
        ]

        encoded = b''.join(cborutil.streamencode(source))

        for step in range(1, 32):
            decoder = cborutil.bufferingdecoder()
            start = 0

            while start < len(encoded):
                decoder.decode(encoded[start : start + step])
                start += step

            self.assertEqual(decoder.getavailable(), [source])

    def testbytearray(self):
        source = b''.join(cborutil.streamencode(b'foobar'))

        decoder = cborutil.bufferingdecoder()
        decoder.decode(bytearray(source))

        self.assertEqual(decoder.getavailable(), [b'foobar'])


class DecodeallTests(TestCase):
    def testemptyinput(self):
        self.assertEqual(cborutil.decodeall(b''), [])

    def testpartialinput(self):
        encoded = b''.join(
            [b'\x82', b'\x01',]  # array of 2 elements  # integer 1
        )

        with self.assertRaisesRegex(
            cborutil.CBORDecodeError, 'input data not complete'
        ):
            cborutil.decodeall(encoded)


if __name__ == '__main__':
    import silenttestrunner

    silenttestrunner.main(__name__)