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https://github.com/pezkuwichain/pezkuwi-common.git
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28 lines
1.3 KiB
JavaScript
28 lines
1.3 KiB
JavaScript
import { hexAddPrefix } from './addPrefix.js';
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import { hexStripPrefix } from './stripPrefix.js';
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/**
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* @name hexFixLength
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* @summary Shifts a hex string to a specific bitLength
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* @description
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* Returns a `0x` prefixed string with the specified number of bits contained in the return value. (If bitLength is -1, length checking is not done). Values with more bits are trimmed to the specified length. Input values with less bits are returned as-is by default. When `withPadding` is set, shorter values are padded with `0`.
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* @example
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* <BR>
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*
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* ```javascript
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* import { hexFixLength } from '@pezkuwi/util';
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*
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* console.log('fixed', hexFixLength('0x12', 16)); // => 0x12
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* console.log('fixed', hexFixLength('0x12', 16, true)); // => 0x0012
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* console.log('fixed', hexFixLength('0x0012', 8)); // => 0x12
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* ```
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*/
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export function hexFixLength(value, bitLength = -1, withPadding = false) {
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const strLength = Math.ceil(bitLength / 4);
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const hexLength = strLength + 2;
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return hexAddPrefix((bitLength === -1 || value.length === hexLength || (!withPadding && value.length < hexLength))
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? hexStripPrefix(value)
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: (value.length > hexLength)
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? hexStripPrefix(value).slice(-1 * strLength)
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: `${'0'.repeat(strLength)}${hexStripPrefix(value)}`.slice(-1 * strLength));
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}
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