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test_buffer.py
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from typing import List
from microschc.binary.buffer import Buffer, Padding
def test_shift():
# left shift is larger than padding, prepend null bytes to buffer prior to shifting
# 10 bits left shift
# <|< < < < < < < <|< v |
# |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0| (|) byte delimiter
# +|+ + + + + + + +|- 0 1 0 1 1 0 1| (-) existing padding
# |- - - - - - - 0|1 0 1 1 0 1 0 0|0 0 0 0 0 0 0 0| (+) extra bits required
buffer: Buffer = Buffer(content=bytes(b'\x2d'), length=7, padding=Padding.LEFT)
shift_value = - 10
shifted_buffer: Buffer = buffer.shift(shift=shift_value, inplace=False)
assert len(shifted_buffer.content) == 3
assert shifted_buffer.content == bytes(b'\x00\xb4\00')
assert shifted_buffer.length == 17
# [----1000 00101101](12)
buffer: Buffer = Buffer(content=bytes(b'\x08\x2d'), length=12, padding=Padding.LEFT)
shift_value = -2
shifted_buffer = buffer.shift(shift=shift_value, inplace=False)
assert len(shifted_buffer.content) == 2
# [--10 0000 1011 0100](14)
assert shifted_buffer.content == bytes(b'\x20\xb4')
# left shift, right padding
# 2 bits left shift
# | < <|v | | |
# |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0| (|) byte delimiter
# |0 0 0 0 1 0 0 0|0 0 1 0 1 - - -|- - - - - - - -| (-) existing padding --> 1 + 4 + 256 = 261
# |0 0 0 0 1 0 0 0|0 0 1 0 1 0 0 -|- - - - - - - -| (+) extra bits required
# [0000 1000 0010 1---](13)
buffer: Buffer = Buffer(content=bytes(b'\x08\x28\x00'), length=13, padding=Padding.RIGHT)
shift_value: int = -2
# [0000 1000 0010 100-](15)
shifted_buffer = buffer.shift(shift=shift_value, inplace=False)
assert len(shifted_buffer.content) == 2
assert shifted_buffer.content == bytes(b'\x08\x28')
assert shifted_buffer.length == 15
# right shift, left padding
# 3 bits right shift
# | | v > > >|
# 7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0| (|) byte delimiter
# |- - - - - - - -|- - - - 1 0 0 0|0 0 1 0 1 1 0 1| (-) existing padding
# |- - - - - - - -|- - - - - - - 1|0 0 0 0 0 1 0 1| (+) extra bits required
buffer: Buffer = Buffer(content=bytes(b'\x00\x08\x2d'), length=12, padding=Padding.LEFT)
shift_value = 3
shifted_buffer = buffer.shift(shift=shift_value, inplace=False)
assert len(shifted_buffer.content) == 2
assert shifted_buffer.content == bytes(b'\x01\x05')
assert shifted_buffer.length == 9
# right shift, left padding
# 6 bits right shift
# | | v > > > > > >|
# 7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0| (|) byte delimiter
# |- - - - - - - -|- - - - 1 0 0 0|0 0 1 0 1 1 0 1| (-) existing padding
# |- - - - - - - -|- - - - - - - -|- - 1 0 0 0 0 0| (+) extra bits required
buffer: Buffer = Buffer(content=bytes(b'\x00\x08\x2d'), length=12, padding=Padding.LEFT)
shift_value = 6
shifted_buffer = buffer.shift(shift=shift_value, inplace=False)
assert len(shifted_buffer.content) == 1
assert shifted_buffer.content == bytes(b'\x20')
assert shifted_buffer.length == 6
def test_repr():
# 11 bits padding on the right
# |0 0 0 0 1 0 0 0|0 0 1 0 1 - - -|- - - - - - - -| (-) padding
buffer: Buffer = Buffer(content=bytes(b'\x08\x28\x00'), length=13, padding=Padding.RIGHT)
repr: str = buffer.__repr__()
assert repr == '[00001000 00101---](13)'
# 11 bits padding on the left
# |- - - - - - - -|- - - 0 1 0 0 0|0 0 1 0 1 0 0 0| (-) padding
buffer: Buffer = Buffer(content=bytes(b'\x00\x08\x28'), length=13, padding=Padding.LEFT)
repr: str = buffer.__repr__()
assert repr == '[---01000 00101000](13)'
# 3 bits padding on the right
# |0 0 0 0 1 0 0 0|0 0 1 0 1 - - -| (-) padding
buffer: Buffer = Buffer(content=bytes(b'\x08\x28'), length=13, padding=Padding.RIGHT)
repr: str = buffer.__repr__()
assert repr == '[00001000 00101---](13)'
# 3 bits padding on the left
# |- - - 0 1 0 0 0|0 0 1 0 1 0 0 0| (-) padding
buffer: Buffer = Buffer(content=bytes(b'\x08\x28'), length=13, padding=Padding.LEFT)
repr: str = buffer.__repr__()
assert repr == '[---01000 00101000](13)'
# b'\x33\xff\x60' ('b'3\xff`') len: 24 padding: right
# |0 0 1 1 0 0 1 1| 1 1 1 1 1 1 1 1| 0 1 1 0 0 0 0 0|
buffer: Buffer = Buffer(content=bytes(b'\x33\xff\x60'), length=24, padding=Padding.RIGHT)
repr: str = buffer.__repr__()
assert repr == '[33ff60](24)'
def test_pad():
# 11 bits padding on the right
# |0 0 0 0 1 0 0 0|0 0 1 0 1 - - -|- - - - - - - -| (-) padding
# |- - - - - - - -|- - - 0 0 0 0 1|0 0 0 0 0 1 0 1| (-) padding
buffer: Buffer = Buffer(content=bytes(b'\x08\x28\x00'), length=13, padding=Padding.RIGHT)
padded: Buffer = buffer.pad(padding=Padding.LEFT, inplace=False)
expected: Buffer = Buffer(content=b'\x01\x05', length=buffer.length, padding=Padding.LEFT)
assert padded == expected
reverted: Buffer = padded.pad(padding=Padding.RIGHT, inplace=False)
assert reverted == buffer
def test_get():
# retrieve bits 1 to 10
#
# 0x01 0x0d
# |- - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (3 bits padding on the left)
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -| (-) padding (3 bits padding on the right)
# + + + + + + + + + (+) bits to output
# |0 0 0 1 0 0 0 0|1 - - - - - -| (-) padding (7 bits padding on the right)
# --> |- - - - - - - 0|0 0 1 0 0 0 0 1|
# 0x00 0x21
buffer: Buffer = Buffer(content=bytes(b'\x01\x0d'), length=13, padding=Padding.LEFT)
expected: Buffer = Buffer(content=bytes(b'\x00\x21'), length=9, padding=Padding.LEFT)
buffer_subset: Buffer = buffer[1:10]
assert buffer_subset == expected
assert buffer_subset.padding == Padding.LEFT
# retrieve bits 1 to 14 --> retrieve 1 to 13
#
# 0x01 0x0d
# | - - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (11 bits padding on the left)
# + + + + + + + + + + + + (+) bits to output
# | - - - - 0 0 0 1|0 0 0 0 1 1 0 1|
# 0x01 0x0d
buffer_subset: Buffer = buffer[1:13]
expected: Buffer = Buffer(content=b'\x01\x0d', length=12, padding=Padding.LEFT)
assert buffer_subset == expected
assert buffer_subset.padding == Padding.LEFT
# retrieve bits 0 to 13
#
# 0x01 0x0d
# | - - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (11 bits padding on the left)
# + + + + + + + + + + + + + (+) bits to output
# | - - - 0 0 0 0 1|0 0 0 0 1 1 0 1|
# 0x01 0x41
buffer: Buffer = Buffer(content=bytes(b'\x01\x0d'), length=13, padding=Padding.LEFT)
expected: Buffer = Buffer(content=bytes(b'\x01\x0d'), length=13, padding=Padding.LEFT)
buffer_subset: Buffer = buffer[0:13]
assert buffer_subset == expected
assert buffer_subset.padding == Padding.LEFT
# retrieve last 4 bits (9 to 13)
#
# 0x01 0x0d
# | - - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (11 bits padding on the left)
# + + + + (+) bits to output
# |- - - - 1 1 0 1|
# 0x01
buffer: Buffer = Buffer(content=bytes(b'\x01\x0d'), length=13, padding=Padding.LEFT)
expected: Buffer = Buffer(content=bytes(b'\x0d'), length=4, padding=Padding.LEFT)
buffer_subset: Buffer = buffer[-4:]
assert buffer_subset == expected
assert buffer_subset.padding == Padding.LEFT
# retrieve bits 1 to 10
#
# 0x08 0x68
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -| (-) padding (11 bits padding on the right)
# + + + + + + + + + (+) bits to output
# --> |0 0 0 1 0 0 0 0|1 - - - - - - -|
# 0x10 0x80
buffer: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
expected: Buffer = Buffer(content=bytes(b'\x10\x80'), length=9, padding=Padding.RIGHT)
buffer_subset: Buffer = buffer[1:10]
assert buffer_subset == expected
assert buffer_subset.padding == Padding.RIGHT
# retrieve bits 0 to 13
#
# 0x08 0x68 0x00
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -|- - - - - - - -| (-) padding (11 bits padding on the right)
# + + + + + + + + + + + + (+) bits to output
# --> |0 0 0 1 0 0 0 0|0 1 1 0 1 - - -|
# 0x08 0x68
buffer: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
expected: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
buffer_subset: Buffer = buffer[0:13]
assert buffer_subset == expected
assert buffer_subset.padding == Padding.RIGHT
# retrieve last 4 bits (9 to 13)
#
# 0x08 0x68 0x00
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -|- - - - - - - -| (-) padding (11 bits padding on the right)
# + + + + (+) bits to output
# --> |1 1 0 1 - - - -|
# 0xd0
buffer: Buffer = Buffer(content=bytes(b'\x01\x68'), length=13, padding=Padding.RIGHT)
expected: Buffer = Buffer(content=bytes(b'\xd0'), length=4, padding=Padding.RIGHT)
buffer_subset: Buffer = buffer[-4:]
assert buffer_subset == expected
assert buffer_subset.padding == Padding.RIGHT
buffer: Buffer = Buffer(content=bytes(b'\xc0'), length=8, padding=Padding.LEFT)
expected: Buffer = Buffer(content=bytes(b'\x03'), length=2, padding=Padding.LEFT)
buffer_subset: Buffer = buffer[0:2]
assert buffer_subset == expected
buffer: Buffer = Buffer(content=bytes(b'\x68'), length=8, padding=Padding.LEFT)
buffer_02: Buffer = buffer[0:2]
buffer_24: Buffer = buffer[2:4]
assert buffer_02 == Buffer(content=bytes(b'\x01'), length=2, padding=Padding.LEFT)
assert buffer_24 == Buffer(content=bytes(b'\x02'), length=2, padding=Padding.LEFT)
def test_set():
buffer: Buffer = Buffer(content=bytes(b'\xf0\x01\x0d'), length=24, padding=Padding.LEFT)
expected: Buffer = Buffer(content=bytes(b'\xff\x01\x0d'), length=24, padding=Padding.LEFT)
buffer[4:8] = Buffer(content=b'\x0f', length=4, padding=Padding.LEFT)
assert buffer == expected
assert buffer.padding == Padding.LEFT
assert buffer.length == 24
buffer: Buffer = Buffer(content=bytes(b'\x00\x01\x0d'), length=24, padding=Padding.LEFT)
expected: Buffer = Buffer(content=bytes(b'\x00\x01\x00\xff'), length=32, padding=Padding.LEFT)
buffer[16:32] = Buffer(content=bytes(b'\x00\xff'),length=16, padding=Padding.LEFT)
assert buffer == expected
assert buffer.padding == Padding.LEFT
assert buffer.length == 32
def test_add():
left: Buffer = Buffer(content=b'\x40', length=2, padding=Padding.RIGHT)
right: Buffer = Buffer(content=b'\x80', length=2, padding=Padding.RIGHT)
left_right = left + right
expected: Buffer = Buffer(content=b'\x60', length=4, padding=Padding.RIGHT)
assert left_right == expected
left: Buffer = Buffer(content=b'\x40', length=2, padding=Padding.RIGHT)
right: Buffer = Buffer(content=b'\x80', length=8, padding=Padding.RIGHT)
left_right = left + right
expected: Buffer = Buffer(content=b'\x60\x00', length=10, padding=Padding.RIGHT)
assert left_right == expected
left: Buffer = Buffer(content=b'\x60', length=4, padding=Padding.RIGHT)
right: Buffer = Buffer(content=b'\x80', length=4, padding=Padding.RIGHT)
left_right = left + right
expected: Buffer = Buffer(content=b'\x68', length=8, padding=Padding.RIGHT)
assert left_right == expected
left: Buffer = Buffer(content=b'\x0f', length=4, padding=Padding.LEFT)
right: Buffer = Buffer(content=b'\x0f', length=4, padding=Padding.LEFT)
left_right = left + right
expected: Buffer = Buffer(content=b'\xff', length=8, padding=Padding.LEFT)
assert left_right == expected
left: Buffer = Buffer(content=b'\xf0', length=4, padding=Padding.RIGHT)
right: Buffer = Buffer(content=b'\x0f', length=4, padding=Padding.LEFT)
left_right = left + right
expected: Buffer = Buffer(content=b'\xff', length=8, padding=Padding.RIGHT)
assert left_right == expected
left: Buffer = Buffer(content=b'\x0f', length=4, padding=Padding.LEFT)
right: Buffer = Buffer(content=b'\xf0', length=4, padding=Padding.RIGHT)
left_right = left + right
expected: Buffer = Buffer(content=b'\xff', length=8, padding=Padding.LEFT)
assert left_right == expected
left:Buffer = Buffer(content=b'\xc0', length=2, padding=Padding.RIGHT)
right: Buffer = Buffer(content=b'\x01', length=8, padding=Padding.LEFT)
left_right: Buffer = left + right
expected: Buffer = Buffer(content=b'\xc0\x40', length=10, padding=Padding.RIGHT)
assert left_right == expected
left:Buffer = Buffer(content=b'', length=0, padding=Padding.LEFT)
right: Buffer = Buffer(content=b'\x06', length=4, padding=Padding.LEFT)
left_right: Buffer = left + right
expected: Buffer = Buffer(content=b'\x06', length=4, padding=Padding.LEFT)
assert left_right == expected
left:Buffer = Buffer(content=b'\xe0', length=7, padding=Padding.RIGHT)
right: Buffer = Buffer(content=b'\x05', length=4, padding=Padding.LEFT)
left_right: Buffer = left + right
expected: Buffer = Buffer(content=b'\xe0\xa0', length=11, padding=Padding.RIGHT)
assert left_right == expected
def test_or():
# 0x08 0x68
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -| (-) padding (3 bits padding on the right)
buffer_1: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
buffer_1_or_1: Buffer = buffer_1 | buffer_1
expected_1_or_1: Buffer = Buffer(content=b'\x08\x68', length=13, padding=Padding.RIGHT)
assert buffer_1_or_1 == expected_1_or_1
# 0x04 0x78
# |0 0 0 0 0 1 0 0|0 1 1 1 1 - - -| (-) padding (3 bits padding on the right)
buffer_2: Buffer = Buffer(content=bytes(b'\x04\x78'), length=13, padding=Padding.RIGHT)
buffer_1_or_2: Buffer = buffer_1 | buffer_2
# 0x0c 0x78
# |0 0 0 0 1 1 0 0|0 1 1 1 1 - - -| (-) padding (3 bits padding on the right)
expected_1_or_2: Buffer = Buffer(content=b'\x0c\x78', length=13, padding=Padding.RIGHT)
assert buffer_1_or_2 == expected_1_or_2
# 0xf0 0x0f
# |1 1 1 1 0 0 0 0|1 1 1 1 0 0 0 0| (-) padding (0 bits padding on the right)
buffer_3: Buffer = Buffer(content=bytes(b'\xf0\xf0'), length=16, padding=Padding.RIGHT)
# 0x0f 0xf0
# |0 0 0 0 1 1 1 1|1 1 1 1 0 0 0 0| (-) padding (0 bits padding on the right)
buffer_4: Buffer = Buffer(content=bytes(b'\x0f\x0f'), length=16, padding=Padding.RIGHT)
buffer_3_or_4: Buffer = buffer_3 | buffer_4
buffer_3_or_4_expected: Buffer = Buffer(content=bytes(b'\xff\xff'), length=16, padding=Padding.RIGHT)
assert buffer_3_or_4 == buffer_3_or_4_expected
def test_and():
# 0x08 0x68
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -| (-) padding (3 bits padding on the right)
buffer_1: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
buffer_1_and_1: Buffer = buffer_1 & buffer_1
expected_1_and_1: Buffer = Buffer(content=b'\x08\x68', length=13, padding=Padding.RIGHT)
assert buffer_1_and_1 == expected_1_and_1
# 0x03 0x78
# |0 0 0 0 0 1 0 0|0 1 1 1 1 - - -| (-) padding (3 bits padding on the right)
buffer_2: Buffer = Buffer(content=bytes(b'\x03\x78'), length=13, padding=Padding.RIGHT)
buffer_1_and_2: Buffer = buffer_1 & buffer_2
expected_1_and_2: Buffer = Buffer(content=b'\x00\x68', length=13, padding=Padding.RIGHT)
assert buffer_1_and_2 == expected_1_and_2
# 0x08 0x68
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -| (-) padding (3 bits padding on the right)
buffer_1: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
# 0x01 0x0D
# |- - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (3 bits padding on the left)
buffer_1_pad_left: Buffer = Buffer(content=bytes(b'\x01\x0d'), length=13, padding=Padding.LEFT)
buffer_1_and_1_left: Buffer = buffer_1 & buffer_1_pad_left
expected_1_and_1_left: Buffer = Buffer(content=b'\x08\x68', length=13, padding=Padding.RIGHT)
assert buffer_1_and_1_left == expected_1_and_1_left
def test_value():
buffer: Buffer = Buffer(content=b'\x00\x01', length=16)
value: int = buffer.value()
assert value == 1
buffer: Buffer = Buffer(content=b'\x00\x11', length=16)
value: int = buffer.value()
assert value == 17
# 0x01 0x0D
# |- - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (3 bits padding on the left)
buffer: Buffer = Buffer(content=b'\x01\x0d', length=13, padding=Padding.LEFT)
value: int = buffer.value()
assert value == 1 + 4 + 8 + 256
# 0x08 0x68
# |0 0 0 0 1 0 0 0| 0 1 1 0 1 - - -| (-) padding (3 bits padding on the right)
buffer: Buffer = Buffer(content=b'\x08\x68', length=13, padding=Padding.RIGHT)
value: int = buffer.value()
assert value == 1 + 4 + 8 + 256
buffer: Buffer = Buffer(content=b'Hello, World! \xe9', length=120)
value: str = buffer.value('str', encoding='iso-8859-1')
assert value == 'Hello, World! é'
buffer: Buffer = Buffer(content=b'\x80', length=1, padding=Padding.LEFT)
assert buffer.value(type='unsigned int') == 0
def test_iter():
# 0x08 0x68 0x00
# |0 0 0 0 1 0 0 0|0 1 1 0 1 - - -|- - - - - - - -| (-) padding (11 bits padding on the right)
buffer: Buffer = Buffer(content=bytes(b'\x08\x68'), length=13, padding=Padding.RIGHT)
bits = list(buffer)
assert bits == [0, 0, 0, 0, 1, 0 , 0, 0, 0, 1, 1, 0, 1]
# 0x01 0x0d
# | - - - 0 0 0 0 1|0 0 0 0 1 1 0 1| (-) padding (3 bits padding on the left)
buffer = Buffer(content=bytes(b'\x01\x0d'), length=13, padding=Padding.LEFT)
bits = list(buffer)
assert bits == [0, 0, 0, 0, 1, 0 , 0, 0, 0, 1, 1, 0, 1]
def test_chunks():
# 0x1B 0xE8
# |0 0 0 1 1 0 1 1|1 1 1 0 1 - - -| (-) padding (3 bits padding on the right)
buffer: Buffer = Buffer(content=bytes(b'\x1b\xe8'), length=13, padding=Padding.RIGHT)
chunks: List[Buffer] = [c for c in buffer.chunks(2)]
assert chunks[0] == Buffer(content=b'\x00', length=2, padding=Padding.RIGHT)
assert chunks[1] == Buffer(content=b'\x40', length=2, padding=Padding.RIGHT)
assert chunks[2] == Buffer(content=b'\x80', length=2, padding=Padding.RIGHT)
assert chunks[3] == Buffer(content=b'\xC0', length=2, padding=Padding.RIGHT)
assert chunks[4] == Buffer(content=b'\xC0', length=2, padding=Padding.RIGHT)
assert chunks[5] == Buffer(content=b'\x80', length=2, padding=Padding.RIGHT)
assert chunks[6] == Buffer(content=b'\x80', length=1, padding=Padding.RIGHT)
chunks_padded: List[Buffer] = [c for c in buffer.chunks(2, padding=True)]
assert chunks_padded[6] == Buffer(content=b'\x80', length=2, padding=Padding.RIGHT)
def test_json_str():
"""
test JSON serialization of buffer objects
"""
buffer: Buffer = Buffer(content=b"\xaa\xf0", length=12)
json_str: str = buffer.json()
assert json_str == '{"content": "0af0", "length": 12, "padding": "left"}'
def test_from_json():
"""
test JSON serialized to object instance
"""
json_str = '{"content": "0af0", "length": 12, "padding": "left"}'
buffer: Buffer = Buffer.from_json(json_str=json_str)
assert buffer.content == b"\x0a\xf0"
assert buffer.length == 12
assert buffer.padding == Padding.LEFT