def testExponentSetter(self) :
f32 = Float()
f64 = Float(length=64)
def setExponent(f, value) :
f.raw_exponent = value
bin = '01000110000110110100100101100001'
f32.bin = bin
self.assertEqual(f32.bin, bin)
self.assertEqual(f32.raw_sign, '0')
self.assertEqual(f32.raw_exponent, '10001100')
self.assertEqual(f32.raw_mantissa, '00110110100100101100001')
# length 8
f32.raw_exponent = '10101010'
# length 11
self.assertRaises(bitstring.CreationError, setExponent, f32, '10111111111')
# exponent and sign (should remain unchanged)
self.assertEqual(f32.raw_sign, '0')
self.assertEqual(f32.raw_mantissa, '00110110100100101100001')
# invalid binary
self.assertRaises(bitstring.CreationError, setExponent, f32, '10000003')
# invalid type
self.assertRaises(bitstring.CreationError, setExponent, f32, {})
bin = '0100000000010010000110000000000010100111110001011010110001000111'
f64.bin = bin
self.assertEqual(f64.bin, bin)
self.assertEqual(f64.raw_sign, '0')
self.assertEqual(f64.raw_exponent, '10000000001')
self.assertEqual(f64.raw_mantissa, '0010000110000000000010100111110001011010110001000111')
# length 11
f64.raw_exponent = '10101010001'
self.assertEqual(f64.raw_exponent, '10101010001')
# length 50
self.assertRaises(bitstring.CreationError, setExponent, f64, '10001010')
# exponent and sign (should remain unchanged)
self.assertEqual(f64.raw_sign, '0')
self.assertEqual(f64.raw_mantissa,'0010000110000000000010100111110001011010110001000111')
# invalid binary
self.assertRaises(bitstring.CreationError, setExponent, f64, '10111000009')
# invalid type
self.assertRaises(bitstring.CreationError, setExponent, f64, [])
def test_ExponentField_ExponentValue(self) : f = Float() f.raw_exponent = '10000001' self.assertEqual(f.raw_exponent, '10000001') self.assertEqual(f.exponent_field, 129) self.assertEqual(f.exponent_value, 2) f.raw_exponent = '11111111' self.assertEqual(f.raw_exponent, '11111111') self.assertEqual(f.exponent_field, 255) self.assertEqual(f.exponent_value, 128) f = Float(length=64) f.raw_exponent = '10000000000' self.assertEqual(f.raw_exponent, '10000000000') self.assertEqual(f.exponent_field, 1024) self.assertEqual(f.exponent_value, 1) f.raw_exponent = '11111111111' self.assertEqual(f.raw_exponent, '11111111111') self.assertEqual(f.exponent_field, 2047) self.assertEqual(f.exponent_value, 1024)
