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Support Fixed length array's U16/U32/U128/U256 #110

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Support Fixed length array's U16/U32/U128/U256 #110

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16 changes: 16 additions & 0 deletions scalecodec/types.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1957,6 +1957,22 @@ def process_encode(self, value):

else:

if type(value) is str:
if value[0:2] != '0x':
raise ValueError('Give the value is not from 0x')
elif self.runtime_config.get_decoder_class(self.sub_type) is U16 and len(value[2:]) != self.element_count * 4:
raise ValueError('Value should be {} bytes long'.format(self.element_count))
elif self.runtime_config.get_decoder_class(self.sub_type) is U32 and len(value[2:]) != self.element_count * 8:
raise ValueError('Value should be {} bytes long'.format(self.element_count))
elif self.runtime_config.get_decoder_class(self.sub_type) is U64 and len(value[2:]) != self.element_count * 16:
raise ValueError('Value should be {} bytes long'.format(self.element_count))
elif self.runtime_config.get_decoder_class(self.sub_type) is U128 and len(value[2:]) != self.element_count * 32:
raise ValueError('Value should be {} bytes long'.format(self.element_count))
elif self.runtime_config.get_decoder_class(self.sub_type) is U256 and len(value[2:]) != self.element_count * 64:
raise ValueError('Value should be {} bytes long'.format(self.element_count))
else:
return ScaleBytes(value)

if not type(value) is list:
raise ValueError('Given value is not a list')

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15 changes: 15 additions & 0 deletions test/test_scale_types.py
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Original file line number Diff line number Diff line change
Expand Up @@ -364,6 +364,9 @@ def test_dynamic_fixed_array_type_decode(self):
obj = RuntimeConfiguration().create_scale_object('[u32; 0]', data=ScaleBytes(bytes()))
self.assertEqual([], obj.decode())

obj = RuntimeConfiguration().create_scale_object('[u64; 3]', data=ScaleBytes("0x010000000000000002000000000000000300000000000000"))
self.assertEqual([1, 2, 3], obj.decode())

def test_dynamic_fixed_array_type_decode_u8(self):
obj = RuntimeConfiguration().create_scale_object('[u8; 65]', data=ScaleBytes("0xc42b82d02bce3202f6a05d4b06d1ad46963d3be36fd0528bbe90e7f7a4e5fcd38d14234b1c9fcee920d76cfcf43b4ed5dd718e357c2bc1aae3a642975207e67f01"))
self.assertEqual('0xc42b82d02bce3202f6a05d4b06d1ad46963d3be36fd0528bbe90e7f7a4e5fcd38d14234b1c9fcee920d76cfcf43b4ed5dd718e357c2bc1aae3a642975207e67f01', obj.decode())
Expand All @@ -381,13 +384,25 @@ def test_dynamic_fixed_array_type_encode(self):
obj = RuntimeConfiguration().create_scale_object('[u8; 3]')
self.assertEqual('0x010203', str(obj.encode('0x010203')))

obj = RuntimeConfiguration().create_scale_object('[u64; 1]')
self.assertEqual('0x01000000000000000200000000000000', str(obj.encode([1, 2])))

obj = RuntimeConfiguration().create_scale_object('[u64; 3]')
self.assertEqual('0x010000000000000002000000000000000300000000000000', str(obj.encode([1, 2, 3])))

obj = RuntimeConfiguration().create_scale_object('[u64; 3]')
self.assertEqual('0x010000000000000002000000000000000300000000000000', str(obj.encode('0x010000000000000002000000000000000300000000000000')))

def test_invalid_fixed_array_type_encode(self):
obj = RuntimeConfiguration().create_scale_object('[u8; 3]')
self.assertRaises(ValueError, obj.encode, '0x0102')

obj = RuntimeConfiguration().create_scale_object('[u32; 3]')
self.assertRaises(ValueError, obj.encode, '0x0102')

obj = RuntimeConfiguration().create_scale_object('[u64; 3]')
self.assertRaises(ValueError, obj.encode, '0x0102')

def test_custom_tuple(self):
obj = RuntimeConfiguration().create_scale_object('(u8,u8)', ScaleBytes("0x0102"))
self.assertEqual((1, 2), obj.decode())
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