view tests/test-cbor.py @ 46607:e9901d01d135

revlog: add a mechanism to verify expected file position before appending

If someone uses `hg debuglocks`, or some non-hg process writes to the .hg
directory without respecting the locks, or if the repo's on a networked
filesystem, it's possible for the revlog code to write out corrupted data.

The form of this corruption can vary depending on what data was written and how
that happened. We are in the "networked filesystem" case (though I've had users
also do this to themselves with the "`hg debuglocks`" scenario), and most often
see this with the changelog. What ends up happening is we produce two items
(let's call them rev1 and rev2) in the .i file that have the same linkrev,
baserev, and offset into the .d file, while the data in the .d file is appended
properly. rev2's compressed_size is accurate for rev2, but when we go to
decompress the data in the .d file, we use the offset that's recorded in the
index file, which is the same as rev1, and attempt to decompress
rev2.compressed_size bytes of rev1's data. This usually does not succeed. :)

When using inline data, this also fails, though I haven't investigated why too
closely. This shows up as a "patch decode" error. I believe what's happening
there is that we're basically ignoring the offset field, getting the data
properly, but since baserev != rev, it thinks this is a delta based on rev
(instead of a full text) and can't actually apply it as such.

For now, I'm going to make this an optional component and default it to entirely
off. I may increase the default severity of this in the future, once I've
enabled it for my users and we gain more experience with it. Luckily, most of my
users have a versioned filesystem and can roll back to before the corruption has
been written, it's just a hassle to do so and not everyone knows how (so it's a
support burden). Users on other filesystems will not have that luxury, and this
can cause them to have a corrupted repository that they are unlikely to know how
to resolve, and they'll see this as a data-loss event. Refusing to create the
corruption is a much better user experience.

This mechanism is not perfect. There may be false-negatives (racy writes that
are not detected). There should not be any false-positives (non-racy writes that
are detected as such). This is not a mechanism that makes putting a repo on a
networked filesystem "safe" or "supported", just *less* likely to cause
corruption.

Differential Revision: https://phab.mercurial-scm.org/D9952

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__)