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from chrysacase import ChrysalideTestCase
from pychrysalide.common import pack_uleb128, unpack_uleb128, pack_leb128, unpack_leb128
class TestLEB128Values(ChrysalideTestCase):
"""TestCase for common LEB128 features*"""
def testUnsignedLeb128Encoding(self):
"""Pack and unpack unsigned LEB128 values."""
cases = {
624485: b'\xe5\x8e\x26',
127: b'\x7f',
128: b'\x80\x01',
}
# Lecture depuis des blocs individuels
for value, encoding in cases.items():
self.assertEqual(pack_uleb128(value), encoding)
v, r = unpack_uleb128(encoding)
self.assertEqual(value, v)
self.assertEqual(b'', r)
# Lecture depuis un bloc commun
data = b''.join(cases.values())
values = []
while len(data) > 0:
val, data = unpack_uleb128(data)
values.append(val)
self.assertEqual(values, [ k for k in cases.keys() ])
def testSignedLeb128Encoding(self):
"""Pack and unpack signed LEB128 values."""
cases = {
-123456: b'\xc0\xbb\x78',
-42: b'\x56',
-9001: b'\xd7\xb9\x7f',
}
# Lecture depuis des blocs individuels
for value, encoding in cases.items():
self.assertEqual(pack_leb128(value), encoding)
v, r = unpack_leb128(encoding)
self.assertEqual(value, v)
self.assertEqual(b'', r)
# Lecture depuis un bloc commun
data = b''.join(cases.values())
values = []
while len(data) > 0:
val, data = unpack_leb128(data)
values.append(val)
self.assertEqual(values, [ k for k in cases.keys() ])
def testTooBigLeb128Encodings(self):
"""Prevent overflow for LEB128 values."""
v = unpack_uleb128(b'\x80' * 10 + b'\x7f')
self.assertIsNone(v)
v = unpack_leb128(b'\x80' * 10 + b'\x7f')
self.assertIsNone(v)
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