1 | // Copyright 2017-2022 @polkadot/util authors & contributors
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2 | // SPDX-License-Identifier: Apache-2.0
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3 | import { u8aToU8a } from "./toU8a.js";
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4 | /**
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5 | * @name u8aConcat
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6 | * @summary Creates a concatenated Uint8Array from the inputs.
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7 | * @description
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8 | * Concatenates the input arrays into a single `UInt8Array`.
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9 | * @example
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10 | * <BR>
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11 | *
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12 | * ```javascript
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13 | * import { { u8aConcat } from '@polkadot/util';
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14 | *
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15 | * u8aConcat(
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16 | * new Uint8Array([1, 2, 3]),
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17 | * new Uint8Array([4, 5, 6])
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18 | * ); // [1, 2, 3, 4, 5, 6]
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19 | * ```
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20 | */
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21 |
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22 | export function u8aConcat(...list) {
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23 | const u8as = new Array(list.length);
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24 | let length = 0;
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25 |
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26 | for (let i = 0; i < list.length; i++) {
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27 | u8as[i] = u8aToU8a(list[i]);
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28 | length += u8as[i].length;
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29 | }
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30 |
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31 | return u8aConcatStrict(u8as, length);
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32 | }
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33 | /**
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34 | * @name u8aConcatStrict
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35 | * @description A strict version of [[u8aConcat]], accepting only Uint8Array inputs
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36 | */
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37 |
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38 | export function u8aConcatStrict(u8as, length = 0) {
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39 | let offset = 0;
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40 |
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41 | if (!length) {
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42 | for (let i = 0; i < u8as.length; i++) {
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43 | length += u8as[i].length;
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44 | }
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45 | }
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46 |
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47 | const result = new Uint8Array(length);
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48 |
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49 | for (let i = 0; i < u8as.length; i++) {
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50 | result.set(u8as[i], offset);
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51 | offset += u8as[i].length;
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52 | }
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53 |
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54 | return result;
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55 | } |
\ | No newline at end of file |