def testReadSignedBits(self):
data = [0, 0xff, 1, 127, 0x80]
reader = BitStreamReader(bytes(data))
self.assertEqual(0, reader.readSignedBits(8))
self.assertEqual(-1, reader.readSignedBits(8)) # 0xff == -1
self.assertEqual(1, reader.readSignedBits(8))
self.assertEqual(127, reader.readSignedBits(8))
self.assertEqual(-128, reader.readSignedBits(8)) # 0x80 == -128
self.assertEqual(0, reader.readSignedBits(0)) # read 0 bits
with self.assertRaises(PythonRuntimeException):
reader.readSignedBits(1) # no more bits available
with self.assertRaises(PythonRuntimeException):
reader.readSignedBits(-1)
def read(self, reader: BitStreamReader, _index: int) -> int:
"""
Reads signed fixed integer Zserio type from the bit stream.
:param reader: Bit stream from which to read.
:param _index: Not used.
"""
return reader.readSignedBits(self._numBits)
