Flutter Hex To Ascii

amt.dart

import 'dart:convert';

int covertToAmt(var l){
     var amt = 0;
     for (int i = 0, j=l.length-1; i < l.length; i++, j--) {
           amt+=((l[j]<<(i*8)));
       }
        return amt;
 }


List spinoffarray(var inpt){
   var encoded = new List(inpt.length); 
  for (int i = inpt.length-1, j=0; i >=0 ; i--, j++){
      encoded[j]= inpt[i];
  }
   return encoded;
}
List converttoDouble(var inpt){
  var encoded = new List(inpt.length/2); 
    for (var i = 0,j=0, length = inpt.length/2; i < length; i++,j++) 
    {  var  f = inpt[i*2]<<4 &0XF0  ;
       f |=  (inpt[i*2+1]  );
       encoded[j] = f;
    }
   return encoded;
 }

 List convertASCIItoHex (var inpt)
 {  
   var encoded = new List(inpt.length); 
   //List<int> encoded;
   //return res;
    for (int i = 0; i < inpt.length; i++) {
   //   print('${inpt[i]}');
      switch(inpt[i]){
        case '0':
          encoded[i] =(0x00);
          break;
case '1':
          encoded[i] =(0x01);
          break;
case '2':
          encoded[i] =(0x02);
          break;
case '3':
          encoded[i] =(0x03);
          break;
case '4':
          encoded[i] =(0x04);
          break;
case '5':
          encoded[i] =(0x05);
          break;
case '6':
          encoded[i] =(0x06);
          break;
case '7':
          encoded[i] =(0x07);
          break;
          case '8':
          encoded[i] =(0x08);
          break;

case '9':
          encoded[i] =(0x09);
          break;
case 'A':
          encoded[i] =(0x0A);
          break;
case 'B':
          encoded[i] =(0x0B);
          break;
case 'C':
          encoded[i] =(0x0C);
          break;
case 'D':
          encoded[i] =(0x0D);
          break;
  case 'E':
          encoded[i] =(0x0E);
          break;
case 'F':
          encoded[i] =(0x0F);
          break;

      }
    }
    return encoded;
 } 
 
void main() {
  for (int i = 0; i < 5; i++) {
  //  print('hello ${i + 1}');
  }
var im =  convertASCIItoHex("DCFF0000");
   print ('${im}');
  var am = converttoDouble (im);
  print('${am}');
   var san = spinoffarray(am);
  print('${san}');
  
   var amt = covertToAmt(san);
  print('${amt}');
  

   
  
}