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# Copyright (c) 2020, Manfred Moitzi
# License: MIT License
import pytest
from ezdxf.tools.binarydata import BitStream, EndOfBufferError
def test_read_bit():
data = b"\xaa"
bs = BitStream(data)
assert bs.read_bit() == 1
assert bs.read_bit() == 0
assert bs.read_bit() == 1
assert bs.read_bit() == 0
assert bs.read_bit() == 1
assert bs.read_bit() == 0
assert bs.read_bit() == 1
assert bs.read_bit() == 0
with pytest.raises(EndOfBufferError):
_ = bs.read_bit()
def test_read_bits():
data = b"\x0f\x0f"
bs = BitStream(data)
assert bs.read_bits(4) == 0
assert bs.read_bits(2) == 3
assert bs.read_bits(3) == 6
assert bs.read_bits(4) == 1
assert bs.read_bits(3) == 7
def test_read_unsigned_byte():
data = b"\x0f\x0f"
bs = BitStream(data)
assert bs.read_bits(4) == 0
assert bs.read_unsigned_byte() == 0xF0
def test_read_signed_byte():
data = b"\x0f\xf0"
bs = BitStream(data)
assert bs.read_bits(4) == 0
assert bs.read_signed_byte() == -1
def test_read_unsigned_short():
# little endian!
data = b"\x0c\xda\xb0"
bs = BitStream(data)
assert bs.read_bits(4) == 0
assert bs.read_unsigned_short() == 0xABCD
assert bs.read_bits(4) == 0
def test_read_aligned_unsigned_short():
# little endian!
data = b"\x00\xcd\xab"
bs = BitStream(data)
assert bs.read_unsigned_byte() == 0
assert bs.read_unsigned_short() == 0xABCD
def test_read_unsigned_long():
# little endian!
data = b"\x00\x0e\xfc\xda\xb0"
bs = BitStream(data)
assert bs.read_bits(4) == 0
assert bs.read_unsigned_long() == 0xABCDEF00
assert bs.read_bits(4) == 0
def test_read_aligned_unsigned_long():
# little endian!
data = b"\x00\xef\xcd\xab"
bs = BitStream(data)
assert bs.read_unsigned_long() == 0xABCDEF00
def test_read_bitshort():
bs = BitStream(b"\xe0")
assert bs.read_bit_short() == 256 # 11
assert bs.read_bit_short() == 0 # 10
bs = BitStream(b"\x00\xff\xff")
bs.read_bits(6)
assert bs.read_bit_short() == -1
assert BitStream(b"\x7f\x00").read_bit_short() == 252
def test_read_signed_modular_chars():
bs = BitStream(
bytes(
[
0b11101001,
0b10010111,
0b11100110,
0b00110101,
0b10000010,
0b00100100,
0b10000101,
0b01001011,
]
)
)
mc = bs.read_signed_modular_chars()
assert mc == 112823273
mc = bs.read_signed_modular_chars()
assert mc == 4610
mc = bs.read_signed_modular_chars()
assert mc == -1413
def test_read_unsigned_modular_chars():
bs = BitStream(
bytes(
[
0b11101001,
0b10010111,
0b11100110,
0b00110101,
0b10000010,
0b00100100,
0b10000101,
0b01001011,
]
)
)
mc = bs.read_unsigned_modular_chars()
assert mc == 112823273
mc = bs.read_unsigned_modular_chars()
assert mc == 4610
mc = bs.read_unsigned_modular_chars()
assert mc == 9605
def test_read_modular_shorts():
bs = BitStream(
bytes(
[
0b00110001,
0b11110100,
0b10001101,
0b00000000,
]
)
)
ms = bs.read_modular_shorts()
assert ms == 4650033
def test_read_object_type():
assert BitStream(bytes([0b00000000, 0b01000000])).read_object_type() == 1
assert (
BitStream(bytes([0b01000000, 0b01000000])).read_object_type()
== 1 + 0x1F0
)
assert (
BitStream(
bytes([0b10000000, 0b01000000, 0b01000000])
).read_object_type()
== 257
)
assert (
BitStream(
bytes([0b11000000, 0b01000000, 0b01000000])
).read_object_type()
== 257
)
if __name__ == "__main__":
pytest.main([__file__])
|
