var verkle_binary = (function(){
    
    function string_to_array(x) {
        var a = new Uint8Array(x.length);
        for (var i=0; i<x.length; i++) {
            a[i] = x.charCodeAt(i);
        }
        return Array.from(a);
    }
    function array_to_string(x) {
        var a = "";
        for (var i=0; i<x.length ; i++) {
            a += String.fromCharCode(x[i]);
        }
        return a;
    }
    function array_to_int(l) {
        var x = BigInt(0);
        for (var i = 0; i < l.length; i++) {
            x = (256n * x) + BigInt(l[i]);
        }
        return x;
    }
    
    function integer_to_array(i, size) {
        //this is not the inverse function of array_to_int.
        //because array to int is accepting big endian encoded binaries, but integer_to_array is returning little endian encoded binaries.
        var a = [];
        i = BigInt(i);
        for ( var b = 0; b < size ; b++ ) {
            
            c = ((BigInt(i) % 256n) + 256n) % 256n;
            a.push(Number(c));
            i = i/256n;
        }
        return(a);//in little endian.
        //return a.reverse();
    }

    return({
        integer_to_array: integer_to_array,
        string_to_array: string_to_array,
        array_to_string: array_to_string,
        array_to_int: array_to_int
    });
})();