Bytes to hex, string to bytes, bytes to string

fridaUtils.js

/**
 * 
 * Author: __rodx00__
 * 
 * Usefull functions while reversing frida scripts.
 */

function bin2ascii(array) {
var result = [];

for (var i = 0; i < array.length; ++i) {
 result.push(
   String.fromCharCode(
     // hex2ascii part
     parseInt(
       ("0" + (array[i] & 0xff).toString(16)).slice(-2), // binary2hex part
       16
     )
   )
 );
}
return result.join("");
}

// bytes2HEX
function bytes2Hex(arrBytes){
    var str = "";
    for (var i = 0; i < arrBytes.length; i++) {
        var tmp;
        var num = arrBytes[i];
        if (num < 0) {
            tmp = (255 + num + 1).toString(16);
        } else {
            tmp = num.toString(16);
        }
        if (tmp.length == 1) {
            tmp = "0" + tmp;
        }
        if(i>0){
            str += " "+tmp;
        }else{
            str += tmp;
        }
    }
    return str;
}

// string2Bytes
function string2Bytes(str) {
    var bytes = new Array();
    var len, c;
    len = str.length;
    for(var i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if(c >= 0x010000 && c <= 0x10FFFF) {
            bytes.push(((c >> 18) & 0x07) | 0xF0);
            bytes.push(((c >> 12) & 0x3F) | 0x80);
            bytes.push(((c >> 6) & 0x3F) | 0x80);
            bytes.push((c & 0x3F) | 0x80);
        } else if(c >= 0x000800 && c <= 0x00FFFF) {
            bytes.push(((c >> 12) & 0x0F) | 0xE0);
            bytes.push(((c >> 6) & 0x3F) | 0x80);
            bytes.push((c & 0x3F) | 0x80);
        } else if(c >= 0x000080 && c <= 0x0007FF) {
            bytes.push(((c >> 6) & 0x1F) | 0xC0);
            bytes.push((c & 0x3F) | 0x80);
        } else {
            bytes.push(c & 0xFF);
        }
    }
    return bytes;
}

//Bytes2String
function bytes2String(arr) {
    if(typeof arr === 'string') {
        return arr;
    }
    var str = '',
        _arr = arr;
    for(var i = 0; i < _arr.length; i++) {
        var one = _arr[i].toString(2),
            v = one.match(/^1+?(?=0)/);
        if(v && one.length == 8) {
            var bytesLength = v[0].length;
            var store = _arr[i].toString(2).slice(7 - bytesLength);
            for(var st = 1; st < bytesLength; st++) {
                store += _arr[st + i].toString(2).slice(2);
            }
            try {
                str += String.fromCharCode(parseInt(store, 2));
            } catch (error) {
                str += parseInt(store, 2).toString(); 
                console.log(error);
            }
            
            i += bytesLength - 1;
        } else {
            try {
                str += String.fromCharCode(_arr[i]);
            } catch (error) {
                str += parseInt(store, 2).toString(); 
                console.log(error);
            }
            
        }
    }
    return str;
}

//BytesToString
function bytesToString(value) {
    var buffer = Java.array('byte', value);
    var StringClass = Java.use('java.lang.String');
    return StringClass.$new(buffer);
}