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from unittest import TestCase
from aioquic.buffer import Buffer, BufferReadError, BufferWriteError, size_uint_var
class BufferTest(TestCase):
def test_data_slice(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.data_slice(0, 8), b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.data_slice(1, 3), b"\x07\x06")
with self.assertRaises(BufferReadError):
buf.data_slice(-1, 3)
with self.assertRaises(BufferReadError):
buf.data_slice(0, 9)
with self.assertRaises(BufferReadError):
buf.data_slice(1, 0)
def test_pull_bytes(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.pull_bytes(3), b"\x08\x07\x06")
def test_pull_bytes_negative(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
with self.assertRaises(BufferReadError):
buf.pull_bytes(-1)
def test_pull_bytes_truncated(self):
buf = Buffer(capacity=0)
with self.assertRaises(BufferReadError):
buf.pull_bytes(2)
self.assertEqual(buf.tell(), 0)
def test_pull_bytes_zero(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.pull_bytes(0), b"")
def test_pull_uint8(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.pull_uint8(), 0x08)
self.assertEqual(buf.tell(), 1)
def test_pull_uint8_truncated(self):
buf = Buffer(capacity=0)
with self.assertRaises(BufferReadError):
buf.pull_uint8()
self.assertEqual(buf.tell(), 0)
def test_pull_uint16(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.pull_uint16(), 0x0807)
self.assertEqual(buf.tell(), 2)
def test_pull_uint16_truncated(self):
buf = Buffer(capacity=1)
with self.assertRaises(BufferReadError):
buf.pull_uint16()
self.assertEqual(buf.tell(), 0)
def test_pull_uint32(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.pull_uint32(), 0x08070605)
self.assertEqual(buf.tell(), 4)
def test_pull_uint32_truncated(self):
buf = Buffer(capacity=3)
with self.assertRaises(BufferReadError):
buf.pull_uint32()
self.assertEqual(buf.tell(), 0)
def test_pull_uint64(self):
buf = Buffer(data=b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.pull_uint64(), 0x0807060504030201)
self.assertEqual(buf.tell(), 8)
def test_pull_uint64_truncated(self):
buf = Buffer(capacity=7)
with self.assertRaises(BufferReadError):
buf.pull_uint64()
self.assertEqual(buf.tell(), 0)
def test_push_bytes(self):
buf = Buffer(capacity=3)
buf.push_bytes(b"\x08\x07\x06")
self.assertEqual(buf.data, b"\x08\x07\x06")
self.assertEqual(buf.tell(), 3)
def test_push_bytes_truncated(self):
buf = Buffer(capacity=3)
with self.assertRaises(BufferWriteError):
buf.push_bytes(b"\x08\x07\x06\x05")
self.assertEqual(buf.tell(), 0)
def test_push_bytes_zero(self):
buf = Buffer(capacity=3)
buf.push_bytes(b"")
self.assertEqual(buf.data, b"")
self.assertEqual(buf.tell(), 0)
def test_push_uint8(self):
buf = Buffer(capacity=1)
buf.push_uint8(0x08)
self.assertEqual(buf.data, b"\x08")
self.assertEqual(buf.tell(), 1)
def test_push_uint16(self):
buf = Buffer(capacity=2)
buf.push_uint16(0x0807)
self.assertEqual(buf.data, b"\x08\x07")
self.assertEqual(buf.tell(), 2)
def test_push_uint32(self):
buf = Buffer(capacity=4)
buf.push_uint32(0x08070605)
self.assertEqual(buf.data, b"\x08\x07\x06\x05")
self.assertEqual(buf.tell(), 4)
def test_push_uint64(self):
buf = Buffer(capacity=8)
buf.push_uint64(0x0807060504030201)
self.assertEqual(buf.data, b"\x08\x07\x06\x05\x04\x03\x02\x01")
self.assertEqual(buf.tell(), 8)
def test_seek(self):
buf = Buffer(data=b"01234567")
self.assertFalse(buf.eof())
self.assertEqual(buf.tell(), 0)
buf.seek(4)
self.assertFalse(buf.eof())
self.assertEqual(buf.tell(), 4)
buf.seek(8)
self.assertTrue(buf.eof())
self.assertEqual(buf.tell(), 8)
with self.assertRaises(BufferReadError):
buf.seek(-1)
self.assertEqual(buf.tell(), 8)
with self.assertRaises(BufferReadError):
buf.seek(9)
self.assertEqual(buf.tell(), 8)
class UintVarTest(TestCase):
def roundtrip(self, data, value):
buf = Buffer(data=data)
self.assertEqual(buf.pull_uint_var(), value)
self.assertEqual(buf.tell(), len(data))
buf = Buffer(capacity=8)
buf.push_uint_var(value)
self.assertEqual(buf.data, data)
def test_uint_var(self):
# 1 byte
self.roundtrip(b"\x00", 0)
self.roundtrip(b"\x01", 1)
self.roundtrip(b"\x25", 37)
self.roundtrip(b"\x3f", 63)
# 2 bytes
self.roundtrip(b"\x7b\xbd", 15293)
self.roundtrip(b"\x7f\xff", 16383)
# 4 bytes
self.roundtrip(b"\x9d\x7f\x3e\x7d", 494878333)
self.roundtrip(b"\xbf\xff\xff\xff", 1073741823)
# 8 bytes
self.roundtrip(b"\xc2\x19\x7c\x5e\xff\x14\xe8\x8c", 151288809941952652)
self.roundtrip(b"\xff\xff\xff\xff\xff\xff\xff\xff", 4611686018427387903)
def test_pull_uint_var_truncated(self):
buf = Buffer(capacity=0)
with self.assertRaises(BufferReadError):
buf.pull_uint_var()
buf = Buffer(data=b"\xff")
with self.assertRaises(BufferReadError):
buf.pull_uint_var()
def test_push_uint_var_too_big(self):
buf = Buffer(capacity=8)
with self.assertRaises(ValueError) as cm:
buf.push_uint_var(4611686018427387904)
self.assertEqual(
str(cm.exception), "Integer is too big for a variable-length integer"
)
def test_size_uint_var(self):
self.assertEqual(size_uint_var(63), 1)
self.assertEqual(size_uint_var(16383), 2)
self.assertEqual(size_uint_var(1073741823), 4)
self.assertEqual(size_uint_var(4611686018427387903), 8)
with self.assertRaises(ValueError) as cm:
size_uint_var(4611686018427387904)
self.assertEqual(
str(cm.exception), "Integer is too big for a variable-length integer"
)
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