utils.js

/**
 iZ³ | Izzzio blockchain - https://izzz.io
 @author: Andrey Nedobylsky (admin@twister-vl.ru)
 */


module.exports = {

    /**
     * Convert hex number string to utf-16
     * @param str
     * @return {*}
     */
    hexString2Unicode: function (str) {

        if(str.length % 4 !== 0) {
            return false;
        }

        str = str.toLowerCase();
        let code = '';
        str = str.match(/.{1,4}/g);
        for (let s of str) {
            if(s.length === 4) {
                code += String.fromCharCode(parseInt(s, 16));
            } else {
                code += s;
            }
        }

        return code;
    },
    /**
     * Convert utf-16 string to hex
     * @param uniStr
     * @return {string}
     */
    unicode2HexString: function (uniStr) {
        let str = '';
        for (let i = 0; i < uniStr.length; i++) {
            let charCode = uniStr.charCodeAt(i);
            if(charCode < 0x1000) {
                str += '0';
            }
            if(charCode < 0x100) {
                str += '0';
            }
            if(charCode < 0x10) {
                str += '0';
            }
            str += charCode.toString(16);
        }

        return str;
    },

    /**
     * Hex string to Uint8Array
     * @param hexString
     * @return {Uint8Array}
     * @constructor
     */
    hexString2Uint8Array: function (hexString) {
        return new Uint8Array(hexString.match(/.{1,2}/g).map(byte => parseInt(byte, 16)))
    },

    /**
     * Uint8Array to hex string
     * @param arr
     * @return {*}
     * @constructor
     */
    uint8ArrayToHexString: function (arr) {
        return String(Buffer.from(arr).toString('hex'));
    },


};