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• bitstring-master
  • bitstring.py
  • release_notes.txt
  • LICENSE
  • test
    • test_bits.py
    • test_bitstore.py
    • smalltestfile
    • test_constbitstream.py
    • test.m1v
    • test_bitarray.py
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    • stress_test.py
  • README.rst
  • setup.py
  • .travis.yml
  • MANIFEST.in
  • doc
    • functions.rst
    • release_notes.rst
    • constbitstream.rst
    • bitstream.rst
    • reference.rst
    • bitstring_classes.rst
    • slicing.rst
    • constbitarray.rst
    • introduction.rst
    • exp-golomb.rst
    • interpretation.rst
    • packing.rst
    • examples.rst
    • reading.rst
    • optimisation.rst
    • contents.rst
    • creation.rst
    • appendices.rst
    • misc.rst
    • index.rst
    • conf.py
    • bitarray.rst
    • walkthrough.rst
    • quick_ref.rst

#!/usr/bin/env python

import unittest
import sys
sys.path.insert(0, '..')
import bitstring
import io
from bitstring import ConstBitStream as CBS

class All(unittest.TestCase):
    def testFromFile(self):
        s = CBS(filename='test.m1v')
        self.assertEqual(s[0:32].hex, '000001b3')
        self.assertEqual(s.read(8 * 4).hex, '000001b3')
        width = s.read(12).uint
        height = s.read(12).uint
        self.assertEqual((width, height), (352, 288))


class InterleavedExpGolomb(unittest.TestCase):
    def testReading(self):
        s = CBS(uie=333)
        a = s.read('uie')
        self.assertEqual(a, 333)
        s = CBS('uie=12, sie=-9, sie=9, uie=1000000')
        u = s.unpack('uie, 2*sie, uie')
        self.assertEqual(u, [12, -9, 9, 1000000])

    def testReadingErrors(self):
        s = CBS(10)
        with self.assertRaises(bitstring.ReadError):
            s.read('uie')
        self.assertEqual(s.pos, 0)
        with self.assertRaises(bitstring.ReadError):
            s.read('sie')
        self.assertEqual(s.pos, 0)


class ReadTo(unittest.TestCase):
    def testByteAligned(self):
        a = CBS('0xaabb00aa00bb')
        b = a.readto('0x00', bytealigned=True)
        self.assertEqual(b, '0xaabb00')
        self.assertEqual(a.bytepos, 3)
        b = a.readto('0xaa', bytealigned=True)
        self.assertEqual(b, '0xaa')
        with self.assertRaises(bitstring.ReadError):
            b.readto('0xcc', bytealigned=True)

    def testNotAligned(self):
        a = CBS('0b00111001001010011011')
        a.pos = 1
        self.assertEqual(a.readto('0b00'), '0b011100')
        self.assertEqual(a.readto('0b110'), '0b10010100110')
        with self.assertRaises(ValueError):
            a.readto('')

    def testDisallowIntegers(self):
        a = CBS('0x0f')
        with self.assertRaises(ValueError):
            a.readto(4)

    def testReadingLines(self):
        s = b"This is a test\nof reading lines\nof text\n"
        b = CBS(bytes=s)
        n = bitstring.Bits(bytes=b'\n')
        self.assertEqual(b.readto(n).bytes, b'This is a test\n')
        self.assertEqual(b.readto(n).bytes, b'of reading lines\n')
        self.assertEqual(b.readto(n).bytes, b'of text\n')


class Subclassing(unittest.TestCase):

    def testIsInstance(self):
        class SubBits(CBS): pass
        a = SubBits()
        self.assertTrue(isinstance(a, SubBits))

    def testClassType(self):
        class SubBits(CBS): pass
        self.assertEqual(SubBits().__class__, SubBits)


class PadToken(unittest.TestCase):

    def testRead(self):
        s = CBS('0b100011110001')
        a = s.read('pad:1')
        self.assertEqual(a, None)
        self.assertEqual(s.pos, 1)
        a = s.read(3)
        self.assertEqual(a, CBS('0b000'))
        a = s.read('pad:0')
        self.assertEqual(a, None)
        self.assertEqual(s.pos, 4)

    def testReadList(self):
        s = CBS('0b10001111001')
        t = s.readlist('pad:1, uint:3, pad:4, uint:3')
        self.assertEqual(t, [0, 1])
        s.pos = 0
        t = s.readlist('pad:1, pad:5')
        self.assertEqual(t, [])
        self.assertEqual(s.pos, 6)
        s.pos = 0
        t = s.readlist('pad:1, bin, pad:4, uint:3')
        self.assertEqual(t, ['000', 1])
        s.pos = 0
        t = s.readlist('pad, bin:3, pad:4, uint:3')
        self.assertEqual(t, ['000', 1])


class ReadingBytes(unittest.TestCase):

    def testUnpackingBytes(self):
        s = CBS(80)
        t = s.unpack('bytes:1')
        self.assertEqual(t[0], b'\x00')
        a, b, c = s.unpack('bytes:1, bytes, bytes:2')
        self.assertEqual(a, b'\x00')
        self.assertEqual(b, b'\x00'*7)
        self.assertEqual(c, b'\x00'*2)

    def testUnpackingBytesWithKeywords(self):
        s = CBS('0x55'*10)
        t = s.unpack('pad:a, bytes:b, bytes, pad:a', a=4, b=6)
        self.assertEqual(t, [b'\x55'*6, b'\x55'*3])


class Lsb0Reading(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        bitstring.set_lsb0(True)

    @classmethod
    def tearDownClass(cls):
        bitstring.set_lsb0(False)

    def testReadingHex(self):
        s = CBS('0xabcdef')
        self.assertEqual(s.read(4), '0xf')
        self.assertEqual(s.read(4), '0xe')
        self.assertEqual(s.pos, 8)

    # TODO: Add more tests


class BytesIOCreation(unittest.TestCase):

    def testSimpleCreation(self):
        f = io.BytesIO(b"\x12\xff\x77helloworld")
        s = CBS(f)
        self.assertEqual(s[0:8], '0x12')
        self.assertEqual(s.len, 13 * 8)
        s = CBS(f, offset=8, length=12)
        self.assertEqual(s, '0xff7')

    def testExceptions(self):
        f = io.BytesIO(b"123456789")
        s = CBS(f, length=9*8)
        with self.assertRaises(bitstring.CreationError):
            s = CBS(f, length=9*8 + 1)
        with self.assertRaises(bitstring.CreationError):
            s = CBS(f, length=9*8, offset=1)