contract KinguinKrowns is ERC223, StandardToken {
  address public owner;  // token owner adddres
  string public constant name = "Kinguin Krowns";
  string public constant symbol = "KRS";
  uint8 public constant decimals = 18;
  // uint256 public totalSupply; // defined in ERC20 contract
		
  function KinguinKrowns() {
	owner = msg.sender;
    totalSupply = 100000000 * (10**18); // 100 mln
    balances[msg.sender] = totalSupply;
  } 
  
  /*
  //only do if call is from owner modifier
  modifier onlyOwner() {
    if (msg.sender != owner) throw;
    _;
  }*/
  
  //function that is called when a user or another contract wants to transfer funds
  function transfer(address _to, uint _value, bytes _data) returns (bool success) {
    //filtering if the target is a contract with bytecode inside it
    if (!super.transfer(_to, _value)) throw; // do a normal token transfer
    if (isContract(_to)) return contractFallback(msg.sender, _to, _value, _data);
    return true;
  }

  function transferFrom(address _from, address _to, uint _value, bytes _data) returns (bool success) {
    if (!super.transferFrom(_from, _to, _value)) throw; // do a normal token transfer
    if (isContract(_to)) return contractFallback(_from, _to, _value, _data);
    return true;
  }

  function transfer(address _to, uint _value) returns (bool success) {
    return transfer(_to, _value, new bytes(0));
  }

  function transferFrom(address _from, address _to, uint _value) returns (bool success) {
    return transferFrom(_from, _to, _value, new bytes(0));
  }

  //function that is called when transaction target is a contract
  function contractFallback(address _origin, address _to, uint _value, bytes _data) private returns (bool success) {
    ERC223Receiver receiver = ERC223Receiver(_to);
    return receiver.tokenFallback(msg.sender, _origin, _value, _data);
  }

  //assemble the given address bytecode. If bytecode exists then the _addr is a contract.
  function isContract(address _addr) private returns (bool is_contract) {
    // retrieve the size of the code on target address, this needs assembly
    uint length;
    assembly { length := extcodesize(_addr) }
    return length > 0;
  }
  
  // returns krown balance of given address 	
  function balanceOf(address _owner) constant returns (uint balance) {
    return balances[_owner];
  }
	
}
function contractFallback(address _origin, address _to, uint _value, bytes _data) private returns (bool success) {
  ERC223Receiver receiver = ERC223Receiver(_to);
  return receiver.tokenFallback(msg.sender, _origin, _value, _data);
}

//function that is called when transaction target is a contract