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#!/usr/bin/env python
import pytest
import sys
import bitstring
import io
import os
from bitstring import ConstBitStream as CBS
import platform
sys.path.insert(0, '..')
THIS_DIR = os.path.dirname(os.path.abspath(__file__))
class TestAll:
def test_from_file(self):
s = CBS(filename=os.path.join(THIS_DIR, 'test.m1v'))
assert s[0:32].hex == '000001b3'
assert s.read(8 * 4).hex == '000001b3'
width = s.read(12).uint
height = s.read(12).uint
assert (width, height) == (352, 288)
def test_from_file_with_offset_and_length(self):
s = CBS(filename=os.path.join(THIS_DIR, 'test.m1v'), offset=24, length=8)
assert s.h == 'b3'
reconstructed = ''
for bit in s:
reconstructed += '1' if bit is True else '0'
assert reconstructed == s.bin
class TestInterleavedExpGolomb:
def test_reading(self):
s = CBS(uie=333)
a = s.read('uie')
assert a == 333
s = CBS('uie=12, sie=-9, sie=9, uie=1000000')
u = s.unpack('uie, 2*sie, uie')
assert u == [12, -9, 9, 1000000]
def test_reading_errors(self):
s = CBS(10)
with pytest.raises(bitstring.ReadError):
s.read('uie')
assert s.pos == 0
with pytest.raises(bitstring.ReadError):
s.read('sie')
assert s.pos == 0
class TestReadTo:
def test_byte_aligned(self):
a = CBS('0xaabb00aa00bb')
b = a.readto('0x00', bytealigned=True)
assert b == '0xaabb00'
assert a.bytepos == 3
b = a.readto('0xaa', bytealigned=True)
assert b == '0xaa'
with pytest.raises(bitstring.ReadError):
b.readto('0xcc', bytealigned=True)
def test_not_aligned(self):
a = CBS('0b00111001001010011011')
a.pos = 1
assert a.readto('0b00') == '0b011100'
assert a.readto('0b110') == '0b10010100110'
with pytest.raises(ValueError):
a.readto('')
def test_disallow_integers(self):
a = CBS('0x0f')
with pytest.raises(ValueError):
a.readto(4)
def test_reading_lines(self):
s = b"This is a test\nof reading lines\nof text\n"
b = CBS(bytes=s)
n = bitstring.Bits(bytes=b'\n')
assert b.readto(n).bytes == b'This is a test\n'
assert b.readto(n).bytes == b'of reading lines\n'
assert b.readto(n).bytes == b'of text\n'
class TestSubclassing:
def test_is_instance(self):
class SubBits(CBS):
pass
a = SubBits()
assert isinstance(a, SubBits)
def test_class_type(self):
class SubBits(CBS):
pass
assert SubBits().__class__ == SubBits
class TestPadToken:
def test_read(self):
s = CBS('0b100011110001')
a = s.read('pad:1')
assert a == None
assert s.pos == 1
a = s.read(3)
assert a == CBS('0b000')
a = s.read('pad:1')
assert a == None
assert s.pos == 5
def test_read_list(self):
s = CBS.fromstring('0b10001111001')
t = s.readlist('pad:1, uint:3, pad:4, uint:3')
assert t == [0, 1]
s.pos = 0
t = s.readlist('pad:1, pad:5')
assert t == []
assert s.pos == 6
s.pos = 0
t = s.readlist('pad:1, bin, pad:4, uint:3')
assert t == ['000', 1]
s.pos = 0
t = s.readlist('pad, bin:3, pad:4, uint:3')
assert t == ['000', 1]
class TestReadingBytes:
def test_unpacking_bytes(self):
s = CBS(80)
t = s.unpack('bytes:1')
assert t[0] == b'\x00'
a, b, c = s.unpack('bytes:1, bytes, bytes2')
assert a == b'\x00'
assert b == b'\x00'*7
assert c == b'\x00'*2
def test_unpacking_bytes_with_keywords(self):
s = CBS('0x55'*10)
t = s.unpack('pad:a, bytes:b, bytes, pad:a', a=4, b=6)
assert t == [b'\x55'*6, b'\x55'*3]
class TestReadingBitsAsDefault:
def test_read_bits(self):
s = CBS('uint:31=14')
v = s.read(31)
assert v.uint == 14
s.pos = 0
def test_read_list_bits(self):
s = CBS('uint:5=3, uint:3=0, uint:11=999')
v = s.readlist([5, 3, 11])
assert [x.uint for x in v] == [3, 0, 999]
s.pos = 0
v = s.readlist(['5', '3', 11])
assert [x.uint for x in v] == [3, 0, 999]
class TestLsb0Reading:
@classmethod
def setup_class(cls):
bitstring.lsb0 = True
@classmethod
def teardown_class(cls):
bitstring.lsb0 = False
def test_reading_hex(self):
s = CBS('0xabcdef')
assert s.read('hex:4') == 'f'
assert s.read(4) == '0xe'
assert s.pos == 8
def test_reading_oct(self):
s = CBS('0o123456')
assert s.read('o6') == '56'
assert s.pos == 6
def test_reading_bin(self):
s = CBS('0b00011')
assert s.read('bin:3') == '011'
assert s.pos == 3
def test_reading_bytes(self):
s = CBS(bytes=b'54321')
assert s.pos == 0
s.pos = 8
assert s.read('bytes:2') == b'32'
class TestBytesIOCreation:
def test_simple_creation(self):
f = io.BytesIO(b"\x12\xff\x77helloworld")
s = CBS(f)
assert s[0:8] == '0x12'
assert len(s) == 13 * 8
s = CBS(f, offset=8, length=12)
assert s == '0xff7'
def test_exceptions(self):
f = io.BytesIO(b"123456789")
_ = CBS(f, length=9*8)
with pytest.raises(bitstring.CreationError):
_ = CBS(f, length=9*8 + 1)
with pytest.raises(bitstring.CreationError):
_ = CBS(f, length=9*8, offset=1)
class TestCreationWithPos:
def test_default_creation(self):
s = CBS('0xabc')
assert s.pos == 0
def test_positive_pos(self):
s = CBS('0xabc', pos=0)
assert s.pos == 0
s = CBS('0xabc', pos=1)
assert s.pos == 1
s = CBS('0xabc', pos=12)
assert s.pos == 12
with pytest.raises(bitstring.CreationError):
_ = CBS('0xabc', pos=13)
def test_negative_pos(self):
s = CBS('0xabc', pos=-1)
assert s.pos == 11
s = CBS('0xabc', pos=-12)
assert s.pos == 0
with pytest.raises(bitstring.CreationError):
_ = CBS('0xabc', pos=-13)
def test_string_representation(self):
s = CBS('0b110', pos=2)
assert s.__repr__() == "ConstBitStream('0b110', pos=2)"
def test_string_representation_from_file(self):
filename = os.path.join(THIS_DIR, 'test.m1v')
s = CBS(filename=filename, pos=2001)
assert s.__repr__() == f"ConstBitStream(filename={repr(str(filename))}, length=1002400, pos=2001)"
s.pos = 0
assert s.__repr__() == f"ConstBitStream(filename={repr(str(filename))}, length=1002400)"
def test_windows_file_lock_bug():
path = os.path.join(THIS_DIR, 'temp_unit_test_file')
# Create the file
with open(path, mode='w') as f:
f.write('Hello')
# Will this lock it?
_ = CBS(filename=path)
try:
with open(path, mode='w') as _:
pass
except OSError:
if platform.system() == 'Windows':
# Expected failure. See bug #308
pass
def test_readerrors():
s = CBS('0b110')
s.read(3)
with pytest.raises(bitstring.ReadError):
_ = s.read(1)
s.pos = 1
with pytest.raises(bitstring.ReadError):
_ = s.read('u3')
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