@ethersphere/swarm-cli/dist/src/utils/hex.js

CLI tool for Bee

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.stripHexPrefix = stripHexPrefix;
exports.hexToBytes = hexToBytes;
exports.bytesToHex = bytesToHex;
/**
 * Strips the '0x' hex prefix from a string

 * @param hex string input
 */
function stripHexPrefix(hex) {
    return hex.startsWith('0x') ? hex.slice(2) : hex;
}
/**
 * Converts a hex string to Uint8Array
 *
 * @param hex string input
 */
function hexToBytes(hex) {
    const hexWithoutPrefix = stripHexPrefix(hex);
    const bytes = new Uint8Array(hexWithoutPrefix.length / 2);
    for (let i = 0; i < bytes.length; i++) {
        const hexByte = hexWithoutPrefix.substr(i * 2, 2);
        bytes[i] = parseInt(hexByte, 16);
    }
    return bytes;
}
/**
 * Converts array of number or Uint8Array to hex string.
 *
 * Optionally provides a the '0x' prefix.
 *
 * @param bytes       The input array
 * @param withPrefix  Provides '0x' prefix when true (default: false)
 */
function bytesToHex(bytes, withPrefix = false) {
    const prefix = withPrefix ? '0x' : '';
    const hexByte = (n) => n.toString(16).padStart(2, '0');
    const hex = Array.from(bytes, hexByte).join('');
    return `${prefix}${hex}`;
}