def bitSizeOf(_bitPosition, value):
"""
Returns length of Zserio varint type stored in the bit stream in bits.
:param _bitPosition: Not used.
:param value: Zserio varint type value.
:returns: Length of given Zserio varint type in bits.
"""
return getBitSizeOfVarInt(value)
def writeVarInt(self, value: int) -> None:
"""
Writes a variable signed integer value (up to 9 bytes) to the underlying storage.
:param value: Value to write.
:raises PythonRuntimeException: If the value is out of the range.
"""
if value == INT64_MIN:
self.writeBits(0x80, 8) # INT64_MIN is stored as -0
else:
self._writeVarNum(value, 9, getBitSizeOfVarInt(value) // 8, isSigned=True)
def writeVarInt(self, value):
"""
Writes a variable signed integer value (up to 9 bytes) to the underlying storage.
:param value: Value to write.
:raises PythonRuntimeException: If the value is out of the range.
"""
if value == INT64_MIN:
self.writeBits(0x80, 8) # INT64_MIN is stored as -0
else:
numBytes = getBitSizeOfVarInt(value) // 8
self._writeVarNum(abs(value), numBytes, VARINT_NUM_BITS, sign=(value < 0))
def testGetBitSizeOfVarInt(self):
self.assertEqual(8, getBitSizeOfVarInt(0))
self.assertEqual(8, getBitSizeOfVarInt(-(1 << 6) + 1))
self.assertEqual(8, getBitSizeOfVarInt((1 << 6) - 1))
self.assertEqual(16, getBitSizeOfVarInt(-(1 << 6)))
self.assertEqual(16, getBitSizeOfVarInt((1 << 6)))
self.assertEqual(16, getBitSizeOfVarInt(-(1 << 13) + 1))
self.assertEqual(16, getBitSizeOfVarInt((1 << 13) - 1))
self.assertEqual(24, getBitSizeOfVarInt(-(1 << 13)))
self.assertEqual(24, getBitSizeOfVarInt((1 << 13)))
self.assertEqual(24, getBitSizeOfVarInt(-(1 << 20) + 1))
self.assertEqual(24, getBitSizeOfVarInt((1 << 20) - 1))
self.assertEqual(32, getBitSizeOfVarInt(-(1 << 20)))
self.assertEqual(32, getBitSizeOfVarInt((1 << 20)))
self.assertEqual(32, getBitSizeOfVarInt(-(1 << 27) + 1))
self.assertEqual(32, getBitSizeOfVarInt((1 << 27) - 1))
self.assertEqual(40, getBitSizeOfVarInt(-(1 << 27)))
self.assertEqual(40, getBitSizeOfVarInt((1 << 27)))
self.assertEqual(40, getBitSizeOfVarInt(-(1 << 34) + 1))
self.assertEqual(40, getBitSizeOfVarInt((1 << 34) - 1))
self.assertEqual(48, getBitSizeOfVarInt(-(1 << 34)))
self.assertEqual(48, getBitSizeOfVarInt((1 << 34)))
self.assertEqual(48, getBitSizeOfVarInt(-(1 << 41) + 1))
self.assertEqual(48, getBitSizeOfVarInt((1 << 41) - 1))
self.assertEqual(56, getBitSizeOfVarInt(-(1 << 41)))
self.assertEqual(56, getBitSizeOfVarInt((1 << 41)))
self.assertEqual(56, getBitSizeOfVarInt(-(1 << 48) + 1))
self.assertEqual(56, getBitSizeOfVarInt((1 << 48) - 1))
self.assertEqual(64, getBitSizeOfVarInt(-(1 << 48)))
self.assertEqual(64, getBitSizeOfVarInt((1 << 48)))
self.assertEqual(64, getBitSizeOfVarInt(-(1 << 55) + 1))
self.assertEqual(64, getBitSizeOfVarInt((1 << 55) - 1))
self.assertEqual(72, getBitSizeOfVarInt(-(1 << 55)))
self.assertEqual(72, getBitSizeOfVarInt((1 << 55)))
self.assertEqual(72, getBitSizeOfVarInt(-(1 << 63) + 1))
self.assertEqual(72, getBitSizeOfVarInt((1 << 63) - 1))
# special case, INT64_MIN is stored as -0
self.assertEqual(8, getBitSizeOfVarInt(INT64_MIN))
with self.assertRaises(PythonRuntimeException):
getBitSizeOfVarInt(INT64_MIN - 1) # below the lower bound
with self.assertRaises(PythonRuntimeException):
getBitSizeOfVarInt(1 << 63) # above the upper bound