package com.likella.util

import java.math.BigInteger

public class BinaryCode {

       protected ArrayList<Byte> code

       static ArrayList<Byte> hexStringToByteArray(String s) {
          ArrayList<Byte> data = []
          for (i in 0..((s.length()-2)/2)) {
             data << ((Character.digit(s.charAt(i*2), 16) << 4 ) + Character.digit(s.charAt(i*2+1), 16))
          }
          data
       }

       static String toHex(ArrayList<Byte> b) {
          String.format("%0" + (b.size() << 1) + "x", new BigInteger(1, (byte[]) b.toArray()))
       }

       BinaryCode(){
          code = []
       }

       BinaryCode(def s, Integer byteSize=null){
          if(s instanceof String)
             code = hexStringToByteArray(s)
          else if(code instanceof BinaryCode)
             code = s.getCode()
          else
             code = s

          if(byteSize){
             if(code.size()<byteSize)
                (code.size()..(byteSize-1)).each{ code<< 0 }
             if(code.size()>byteSize)
                code = code[0..(byteSize-1)]
          }
          println code
       }

       BinaryCode(BinaryCode b){
          code = b.getCode()
       }

       def leftShift(def b){
          def aux = b
          if(b instanceof String)
             aux = b.bytes
          if(b instanceof BinaryCode)
             aux = b.getCode()
          code = [code, aux].flatten()
          this
       }

       def encodeAsMD5(){
          code = hexStringToByteArray( ((byte[])code).encodeAsMD5() )
          this
       }

       def padTo(int n){
          code = Arrays.copyOf( (byte[])code , n)
          this
       }

       String toString(){
          toHex(code)
       }

       ArrayList<Byte> getCode(){
          code
       }

       def xor(def b){

          if(b instanceof String)
          b = b.bytes
          else if (b instanceof BinaryCode)
          b = b.getCode()

          if(size()>0){
             for(i in 0..(size()-1)){
                code[i] = code[i]^b[i]
             }
          }
          this
       }

       int size(){
          code.size()
       }
    }