def test_decode_signed_real(high_bit_size, low_bit_size, integer_bit_size, stream_bytes, data_byte_size): if integer_bit_size > data_byte_size * 8: with pytest.raises(ValueError): SignedRealDecoder.as_decoder( value_bit_size=integer_bit_size, high_bit_size=high_bit_size, low_bit_size=low_bit_size, data_byte_size=data_byte_size, ) return elif high_bit_size + low_bit_size != integer_bit_size: with pytest.raises(ValueError): SignedRealDecoder.as_decoder( value_bit_size=integer_bit_size, high_bit_size=high_bit_size, low_bit_size=low_bit_size, data_byte_size=data_byte_size, ) return else: decoder = SignedRealDecoder.as_decoder( value_bit_size=integer_bit_size, high_bit_size=high_bit_size, low_bit_size=low_bit_size, data_byte_size=data_byte_size, ) stream = BytesIO(stream_bytes) padding_bytes = stream_bytes[:data_byte_size][:data_byte_size - integer_bit_size // 8] if len(stream_bytes) < data_byte_size: with pytest.raises(InsufficientDataBytes): decoder(stream) return elif is_non_empty_non_null_byte_string(padding_bytes): with pytest.raises(NonEmptyPaddingBytes): decoder(stream) return else: decoded_value = decoder(stream) _, upper_bound = compute_signed_integer_bounds(high_bit_size + low_bit_size) unsigned_integer_value = big_endian_to_int(stream_bytes[:data_byte_size]) if unsigned_integer_value >= upper_bound: signed_integer_value = unsigned_integer_value - 2**(high_bit_size + low_bit_size) else: signed_integer_value = unsigned_integer_value with decimal.localcontext(abi_decimal_context): raw_actual_value = decimal.Decimal( signed_integer_value) / 2**low_bit_size actual_value = quantize_value(raw_actual_value, low_bit_size) assert decoded_value == actual_value
def test_encode_signed_integer(integer_value, value_bit_size, data_byte_size): if value_bit_size > data_byte_size * 8: with pytest.raises(ValueError): SignedIntegerEncoder.as_encoder( value_bit_size=value_bit_size, data_byte_size=data_byte_size, ) return encoder = SignedIntegerEncoder.as_encoder( value_bit_size=value_bit_size, data_byte_size=data_byte_size, ) lower_bound, upper_bound = compute_signed_integer_bounds(value_bit_size) if not is_integer(integer_value): with pytest.raises(EncodingTypeError) as exception_info: encoder(integer_value) assert 'SignedInteger' in str(exception_info.value) return elif integer_value < lower_bound or integer_value > upper_bound: with pytest.raises(ValueOutOfBounds): encoder(integer_value) return if integer_value >= 0: expected_value = zpad( int_to_big_endian(integer_value % 2**value_bit_size), data_byte_size ) else: expected_value = fpad( int_to_big_endian(integer_value % 2**value_bit_size), data_byte_size ) encoded_value = encoder(integer_value) assert encoded_value == expected_value
def test_encode_signed_integer(integer_value, value_bit_size, data_byte_size): if value_bit_size > data_byte_size * 8: with pytest.raises(ValueError): SignedIntegerEncoder( value_bit_size=value_bit_size, data_byte_size=data_byte_size, ) return encoder = SignedIntegerEncoder( value_bit_size=value_bit_size, data_byte_size=data_byte_size, ) lower_bound, upper_bound = compute_signed_integer_bounds(value_bit_size) if not is_integer(integer_value): with pytest.raises(EncodingTypeError) as exception_info: encoder(integer_value) assert 'SignedInteger' in str(exception_info.value) return elif integer_value < lower_bound or integer_value > upper_bound: with pytest.raises(ValueOutOfBounds): encoder(integer_value) return if integer_value >= 0: expected_value = zpad( int_to_big_endian(integer_value % 2**value_bit_size), data_byte_size ) else: expected_value = fpad( int_to_big_endian(integer_value % 2**value_bit_size), data_byte_size ) encoded_value = encoder(integer_value) assert encoded_value == expected_value
def test_decode_signed_real(high_bit_size, low_bit_size, integer_bit_size, stream_bytes, data_byte_size): if integer_bit_size > data_byte_size * 8: with pytest.raises(ValueError): SignedRealDecoder( value_bit_size=integer_bit_size, high_bit_size=high_bit_size, low_bit_size=low_bit_size, data_byte_size=data_byte_size, ) return elif high_bit_size + low_bit_size != integer_bit_size: with pytest.raises(ValueError): SignedRealDecoder( value_bit_size=integer_bit_size, high_bit_size=high_bit_size, low_bit_size=low_bit_size, data_byte_size=data_byte_size, ) return else: decoder = SignedRealDecoder( value_bit_size=integer_bit_size, high_bit_size=high_bit_size, low_bit_size=low_bit_size, data_byte_size=data_byte_size, ) stream = ContextFramesBytesIO(stream_bytes) padding_offset = data_byte_size - integer_bit_size // 8 data_offset = padding_offset + integer_bit_size // 8 padding_bytes = stream_bytes[:data_byte_size][:padding_offset] data_bytes = stream_bytes[:data_byte_size][padding_offset:data_offset] if len(stream_bytes) < data_byte_size: with pytest.raises(InsufficientDataBytes): decoder(stream) return elif not is_valid_padding_bytes(padding_bytes, data_bytes): with pytest.raises(NonEmptyPaddingBytes): decoder(stream) return else: decoded_value = decoder(stream) if padding_bytes: if decoded_value >= 0: assert bytes(set(padding_bytes)) == b'\x00' else: assert bytes(set(padding_bytes)) == b'\xff' _, upper_bound = compute_signed_integer_bounds(high_bit_size + low_bit_size) unsigned_integer_value = big_endian_to_int(data_bytes) if unsigned_integer_value >= upper_bound: signed_integer_value = unsigned_integer_value - 2**(high_bit_size + low_bit_size) else: signed_integer_value = unsigned_integer_value with decimal.localcontext(abi_decimal_context): raw_actual_value = decimal.Decimal( signed_integer_value) / 2**low_bit_size actual_value = quantize_value(raw_actual_value, low_bit_size) assert decoded_value == actual_value