42 lines
973 B
TypeScript
42 lines
973 B
TypeScript
// Copyright 2017-2021 @polkadot/util authors & contributors
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
import { u8aToU8a } from './toU8a';
|
|
|
|
/**
|
|
* @name u8aConcat
|
|
* @summary Creates a concatenated Uint8Array from the inputs.
|
|
* @description
|
|
* Concatenates the input arrays into a single `UInt8Array`.
|
|
* @example
|
|
* <BR>
|
|
*
|
|
* ```javascript
|
|
* import { { u8aConcat } from '@polkadot/util';
|
|
*
|
|
* u8aConcat(
|
|
* new Uint8Array([1, 2, 3]),
|
|
* new Uint8Array([4, 5, 6])
|
|
* ); // [1, 2, 3, 4, 5, 6]
|
|
* ```
|
|
*/
|
|
export function u8aConcat (...list: (Buffer | Uint8Array | number[] | string)[]): Uint8Array {
|
|
let length = 0;
|
|
let offset = 0;
|
|
const u8as = new Array<Uint8Array>(list.length);
|
|
|
|
for (let i = 0; i < list.length; i++) {
|
|
u8as[i] = u8aToU8a(list[i]);
|
|
length += u8as[i].length;
|
|
}
|
|
|
|
const result = new Uint8Array(length);
|
|
|
|
for (let i = 0; i < u8as.length; i++) {
|
|
result.set(u8as[i], offset);
|
|
offset += u8as[i].length;
|
|
}
|
|
|
|
return result;
|
|
}
|