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660276a0b8
I'm not a fan of 100% of the Black coding style, but I've spent too much time manually formatting Python code, so let's just pull the trigger.
64 lines
2.3 KiB
Python
64 lines
2.3 KiB
Python
import unittest
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from tests.libdrgn import deserialize_bits, serialize_bits
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VALUE = 12345678912345678989
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def py_serialize_bits(value, bit_offset, bit_size, little_endian):
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bits = bit_offset + bit_size
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size = (bits + 7) // 8
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if little_endian:
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tmp = value << bit_offset
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else:
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tmp = value << -bits % 8
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# Buffer with unused bits set to zero.
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buf0 = tmp.to_bytes(size, "little" if little_endian else "big")
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# Buffer with unused bits set to one.
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buf1 = bytearray(buf0)
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if little_endian:
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# bit_offset least significant bits.
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buf1[0] |= (1 << bit_offset) - 1
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# 8 - (bit_offset + bit_size) % 8 most significant bits.
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buf1[-1] |= (0xFF00 >> -bits % 8) & 0xFF
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else:
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# bit_offset most significant bits.
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buf1[0] |= (0xFF00 >> bit_offset) & 0xFF
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# 8 - (bit_offset + bit_size) % 8 least significant bits.
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buf1[-1] |= (1 << -bits % 8) - 1
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return buf0, buf1
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class TestSerialize(unittest.TestCase):
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def test_deserialize(self):
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for bit_size in range(1, 65):
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expected = VALUE & ((1 << bit_size) - 1)
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for bit_offset in range(8):
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for little_endian in [True, False]:
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for buf in py_serialize_bits(
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expected, bit_offset, bit_size, little_endian
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):
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value = deserialize_bits(
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buf, bit_offset, bit_size, little_endian
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)
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self.assertEqual(value, expected)
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def test_serialize(self):
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for bit_size in range(1, 65):
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value = VALUE & ((1 << bit_size) - 1)
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for bit_offset in range(8):
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for little_endian in [True, False]:
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expected0, expected1 = py_serialize_bits(
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value, bit_offset, bit_size, little_endian
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)
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buf = bytearray(len(expected0))
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serialize_bits(buf, bit_offset, value, bit_size, little_endian)
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self.assertEqual(buf, expected0)
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buf = bytearray([0xFF] * len(expected1))
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serialize_bits(buf, bit_offset, value, bit_size, little_endian)
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self.assertEqual(buf, expected1)
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