Jaco Greeff
47fc4a2b3c
* Bump deps w/ eslint * Additional cleanups * Additional * @polkadot/types done * Additional * @polkadot/typegen done * Additional * @polkadot/rpc-core done * Additional * Additional * Additional * docs * @polkadot/api-derive done * @polkadot/api done * @polkadot/api-contracts done * Update tests
24 lines
773 B
TypeScript
24 lines
773 B
TypeScript
// Copyright 2017-2020 @polkadot/metadata authors & contributors
|
|
// This software may be modified and distributed under the terms
|
|
// of the Apache-2.0 license. See the LICENSE file for details.
|
|
|
|
import { AnyNumber, Registry } from '@polkadot/types/types';
|
|
|
|
import { assert } from '@polkadot/util';
|
|
|
|
import U32 from '@polkadot/types/primitive/U32';
|
|
|
|
export const MAGIC_NUMBER = 0x6174656d; // `meta`, reversed for Little Endian encoding
|
|
|
|
export default class MagicNumber extends U32 {
|
|
constructor (registry: Registry, value?: AnyNumber) {
|
|
super(registry, value);
|
|
|
|
if (!this.isEmpty) {
|
|
const magic = registry.createType('u32', MAGIC_NUMBER);
|
|
|
|
assert(this.eq(magic), `MagicNumber mismatch: expected ${magic.toHex()}, found ${this.toHex()}`);
|
|
}
|
|
}
|
|
}
|