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import struct
import pytest
from kafka.record import util
varint_data = [
(b"\x00", 0),
(b"\x01", -1),
(b"\x02", 1),
(b"\x7E", 63),
(b"\x7F", -64),
(b"\x80\x01", 64),
(b"\x81\x01", -65),
(b"\xFE\x7F", 8191),
(b"\xFF\x7F", -8192),
(b"\x80\x80\x01", 8192),
(b"\x81\x80\x01", -8193),
(b"\xFE\xFF\x7F", 1048575),
(b"\xFF\xFF\x7F", -1048576),
(b"\x80\x80\x80\x01", 1048576),
(b"\x81\x80\x80\x01", -1048577),
(b"\xFE\xFF\xFF\x7F", 134217727),
(b"\xFF\xFF\xFF\x7F", -134217728),
(b"\x80\x80\x80\x80\x01", 134217728),
(b"\x81\x80\x80\x80\x01", -134217729),
(b"\xFE\xFF\xFF\xFF\x7F", 17179869183),
(b"\xFF\xFF\xFF\xFF\x7F", -17179869184),
(b"\x80\x80\x80\x80\x80\x01", 17179869184),
(b"\x81\x80\x80\x80\x80\x01", -17179869185),
(b"\xFE\xFF\xFF\xFF\xFF\x7F", 2199023255551),
(b"\xFF\xFF\xFF\xFF\xFF\x7F", -2199023255552),
(b"\x80\x80\x80\x80\x80\x80\x01", 2199023255552),
(b"\x81\x80\x80\x80\x80\x80\x01", -2199023255553),
(b"\xFE\xFF\xFF\xFF\xFF\xFF\x7F", 281474976710655),
(b"\xFF\xFF\xFF\xFF\xFF\xFF\x7F", -281474976710656),
(b"\x80\x80\x80\x80\x80\x80\x80\x01", 281474976710656),
(b"\x81\x80\x80\x80\x80\x80\x80\x01", -281474976710657),
(b"\xFE\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 36028797018963967),
(b"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", -36028797018963968),
(b"\x80\x80\x80\x80\x80\x80\x80\x80\x01", 36028797018963968),
(b"\x81\x80\x80\x80\x80\x80\x80\x80\x01", -36028797018963969),
(b"\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 4611686018427387903),
(b"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", -4611686018427387904),
(b"\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01", 4611686018427387904),
(b"\x81\x80\x80\x80\x80\x80\x80\x80\x80\x01", -4611686018427387905),
]
@pytest.mark.parametrize("encoded, decoded", varint_data)
def test_encode_varint(encoded, decoded):
res = bytearray()
util.encode_varint(decoded, res.append)
assert res == encoded
@pytest.mark.parametrize("encoded, decoded", varint_data)
def test_decode_varint(encoded, decoded):
# We add a bit of bytes around just to check position is calculated
# correctly
value, pos = util.decode_varint(
bytearray(b"\x01\xf0" + encoded + b"\xff\x01"), 2)
assert value == decoded
assert pos - 2 == len(encoded)
@pytest.mark.parametrize("encoded, decoded", varint_data)
def test_size_of_varint(encoded, decoded):
assert util.size_of_varint(decoded) == len(encoded)
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