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https://github.com/JakeHillion/drgn.git
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66 lines
2.4 KiB
Python
66 lines
2.4 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# SPDX-License-Identifier: GPL-3.0-or-later
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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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