pallet_revive_uapi/precompiles/
utils.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//! Helper utilities around pre-compiles.
19
20/// Returns the Solidity selector for `fn_sig`.
21///
22/// Note that this is a const function, it is evaluated at compile time.
23///
24/// # Usage
25///
26/// ```
27/// # use pallet_revive_uapi::solidity_selector;
28/// let sel = solidity_selector("ownCodeHash()");
29/// assert_eq!(sel, [219, 107, 220, 138]);
30/// ```
31pub const fn solidity_selector(fn_sig: &str) -> [u8; 4] {
32	let output: [u8; 32] =
33		const_crypto::sha3::Keccak256::new().update(fn_sig.as_bytes()).finalize();
34	[output[0], output[1], output[2], output[3]]
35}
pallet_revive_uapi/precompiles/utils.rs

pallet_revive_uapi/precompiles/
utils.rs
