sp_core/
uint.rs

1// This file is part of Substrate.
2
3// Copyright (C) Parity Technologies (UK) Ltd.
4// SPDX-License-Identifier: Apache-2.0
5
6// Licensed under the Apache License, Version 2.0 (the "License");
7// you may not use this file except in compliance with the License.
8// You may obtain a copy of the License at
9//
10// 	http://www.apache.org/licenses/LICENSE-2.0
11//
12// Unless required by applicable law or agreed to in writing, software
13// distributed under the License is distributed on an "AS IS" BASIS,
14// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15// See the License for the specific language governing permissions and
16// limitations under the License.
17
18//! An unsigned fixed-size integer.
19
20pub use primitive_types::{U256, U512};
21
22#[cfg(test)]
23mod tests {
24	use super::*;
25	use codec::{Decode, Encode};
26
27	macro_rules! test {
28		($name: ident, $test_name: ident) => {
29			#[test]
30			fn $test_name() {
31				let tests = vec![
32					($name::from(0), "0x0"),
33					($name::from(1), "0x1"),
34					($name::from(2), "0x2"),
35					($name::from(10), "0xa"),
36					($name::from(15), "0xf"),
37					($name::from(16), "0x10"),
38					($name::from(1_000), "0x3e8"),
39					($name::from(100_000), "0x186a0"),
40					($name::from(u64::MAX), "0xffffffffffffffff"),
41					($name::from(u64::MAX) + $name::from(1), "0x10000000000000000"),
42				];
43
44				for (number, expected) in tests {
45					assert_eq!(
46						format!("{:?}", expected),
47						serde_json::to_string_pretty(&number).expect("Json pretty print failed")
48					);
49					assert_eq!(number, serde_json::from_str(&format!("{:?}", expected)).unwrap());
50				}
51
52				// Invalid examples
53				assert!(serde_json::from_str::<$name>("\"0x\"").unwrap_err().is_data());
54				assert!(serde_json::from_str::<$name>("\"0xg\"").unwrap_err().is_data());
55				assert!(serde_json::from_str::<$name>("\"\"").unwrap_err().is_data());
56			}
57		};
58	}
59
60	test!(U256, test_u256);
61
62	#[test]
63	fn test_u256_codec() {
64		let res1 = vec![
65			120, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
66			0, 0, 0, 0,
67		];
68		let res2 = vec![
69			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
70			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
71			0xff, 0xff, 0xff, 0xff,
72		];
73
74		assert_eq!(U256::from(120).encode(), res1);
75		assert_eq!(U256::max_value().encode(), res2);
76		assert_eq!(U256::decode(&mut &res1[..]), Ok(U256::from(120)));
77		assert_eq!(U256::decode(&mut &res2[..]), Ok(U256::max_value()));
78	}
79
80	#[test]
81	fn test_large_values() {
82		assert_eq!(
83			serde_json::to_string_pretty(&!U256::zero()).expect("Json pretty print failed"),
84			"\"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\""
85		);
86		assert!(serde_json::from_str::<U256>(
87			"\"0x1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\""
88		)
89		.unwrap_err()
90		.is_data());
91	}
92}
sp_core/uint.rs

sp_core/
uint.rs
