@polkadot/util/compact/stripLength.js

A collection of useful utilities for @polkadot

import { compactFromU8a } from './fromU8a.js';
/**
 * @name compactStripLength
 * @description Removes the length prefix, returning both the total length (including the value + compact encoding) and the decoded value with the correct length
 * @example
 * <BR>
 *
 * ```javascript
 * import { compactStripLength } from '@polkadot/util';
 *
 * console.log(compactStripLength(new Uint8Array([2 << 2, 0xde, 0xad]))); // [2, Uint8Array[0xde, 0xad]]
 * ```
 */
export function compactStripLength(input) {
    const [offset, length] = compactFromU8a(input);
    const total = offset + length.toNumber();
    return [
        total,
        input.subarray(offset, total)
    ];
}