mirror of
https://github.com/JakeHillion/drgn.git
synced 2024-12-26 18:45:37 +00:00
64 lines
2.4 KiB
Python
64 lines
2.4 KiB
Python
import unittest
|
|
|
|
from tests.libdrgn import deserialize_bits, serialize_bits
|
|
|
|
|
|
VALUE = 12345678912345678989
|
|
|
|
|
|
def py_serialize_bits(value, bit_offset, bit_size, little_endian):
|
|
bits = bit_offset + bit_size
|
|
size = (bits + 7) // 8
|
|
if little_endian:
|
|
tmp = value << bit_offset
|
|
else:
|
|
tmp = value << -bits % 8
|
|
# Buffer with unused bits set to zero.
|
|
buf0 = tmp.to_bytes(size, 'little' if little_endian else 'big')
|
|
|
|
# Buffer with unused bits set to one.
|
|
buf1 = bytearray(buf0)
|
|
if little_endian:
|
|
# bit_offset least significant bits.
|
|
buf1[0] |= (1 << bit_offset) - 1
|
|
# 8 - (bit_offset + bit_size) % 8 most significant bits.
|
|
buf1[-1] |= (0xff00 >> -bits % 8) & 0xff
|
|
else:
|
|
# bit_offset most significant bits.
|
|
buf1[0] |= (0xff00 >> bit_offset) & 0xff
|
|
# 8 - (bit_offset + bit_size) % 8 least significant bits.
|
|
buf1[-1] |= (1 << -bits % 8) - 1
|
|
|
|
return buf0, buf1
|
|
|
|
|
|
class TestSerialize(unittest.TestCase):
|
|
def test_deserialize(self):
|
|
for bit_size in range(1, 65):
|
|
expected = VALUE & ((1 << bit_size) - 1)
|
|
for bit_offset in range(8):
|
|
for little_endian in [True, False]:
|
|
for buf in py_serialize_bits(expected, bit_offset,
|
|
bit_size, little_endian):
|
|
value = deserialize_bits(buf, bit_offset, bit_size,
|
|
little_endian)
|
|
self.assertEqual(value, expected)
|
|
|
|
def test_serialize(self):
|
|
for bit_size in range(1, 65):
|
|
value = VALUE & ((1 << bit_size) - 1)
|
|
for bit_offset in range(8):
|
|
for little_endian in [True, False]:
|
|
expected0, expected1 = py_serialize_bits(value, bit_offset,
|
|
bit_size,
|
|
little_endian)
|
|
buf = bytearray(len(expected0))
|
|
serialize_bits(buf, bit_offset, value, bit_size,
|
|
little_endian)
|
|
self.assertEqual(buf, expected0)
|
|
|
|
buf = bytearray([0xff] * len(expected1))
|
|
serialize_bits(buf, bit_offset, value, bit_size,
|
|
little_endian)
|
|
self.assertEqual(buf, expected1)
|