QZToken.sol.old

pragma solidity ^0.4.21;

// From https://github.com/Dexaran/ERC223-token-standard/blob/Recommended/Receiver_Interface.sol
contract ContractReceiver {
  function tokenFallback(address _from, uint _value, bytes _data) public;
}

// From https://github.com/Dexaran/ERC223-token-standard/blob/Recommended/ERC223_Interface.sol
contract ERC223 {
  uint public totalSupply;
  function balanceOf(address who) public view returns (uint);
  
  function name() public view returns (string _name);
  function symbol() public view returns (string _symbol);
  function decimals() public view returns (uint8 _decimals);
  function totalSupply() public view returns (uint256 _supply);

  function transfer(address to, uint value) public returns (bool ok);
  function transfer(address to, uint value, bytes data) public returns (bool ok);
  function transfer(address to, uint value, bytes data, string custom_fallback) public returns (bool ok);
  
  event Transfer(address indexed from, address indexed to, uint value, bytes indexed data);
} 
 
/* https://github.com/LykkeCity/EthereumApiDotNetCore/blob/master/src/ContractBuilder/contracts/token/SafeMath.sol */
contract SafeMath {
    uint256 constant public MAX_UINT256 =
    0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;

    function safeAdd(uint256 x, uint256 y) pure internal returns (uint256 z) {
        if (x > MAX_UINT256 - y) revert();
        return x + y;
    }

    function safeSub(uint256 x, uint256 y) pure internal returns (uint256 z) {
        if (x < y) revert();
        return x - y;
    }

    function safeMul(uint256 x, uint256 y) pure internal returns (uint256 z) {
        if (y == 0) return 0;
        if (x > MAX_UINT256 / y) revert();
        return x * y;
    }

}

/**
 * ERC223 token by Dexaran
 *
 * https://github.com/Dexaran/ERC223-token-standard
 */
contract ERC223Token is ERC223, SafeMath {

  mapping(address => uint) balances;
  
  string public name;
  string public symbol;
  uint8 public decimals;
  uint256 public totalSupply;
  
  
  // Function to access name of token .
  function name() public view returns (string _name) {
      return name;
  }
  // Function to access symbol of token .
  function symbol() public view returns (string _symbol) {
      return symbol;
  }
  // Function to access decimals of token .
  function decimals() public view returns (uint8 _decimals) {
      return decimals;
  }
  // Function to access total supply of tokens .
  function totalSupply() public view returns (uint256 _totalSupply) {
      return totalSupply;
  }
  
  
  // Function that is called when a user or another contract wants to transfer funds .
  function transfer(address _to, uint _value, bytes _data, string _custom_fallback) public returns (bool success) {
      
    if(isContract(_to)) {
        if (balanceOf(msg.sender) < _value) revert();
        balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
        balances[_to] = safeAdd(balanceOf(_to), _value);
        assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
        emit Transfer(msg.sender, _to, _value, _data);
        return true;
    }
    else {
        return transferToAddress(_to, _value, _data);
    }
  }
  

  // Function that is called when a user or another contract wants to transfer funds .
  function transfer(address _to, uint _value, bytes _data) public returns (bool success) {
      
    if(isContract(_to)) {
        return transferToContract(_to, _value, _data);
    }
    else {
        return transferToAddress(_to, _value, _data);
    }
  }
  
  // Standard function transfer similar to ERC20 transfer with no _data .
  // Added due to backwards compatibility reasons .
  function transfer(address _to, uint _value) public returns (bool success) {
      
    //standard function transfer similar to ERC20 transfer with no _data
    //added due to backwards compatibility reasons
    bytes memory empty;
    if(isContract(_to)) {
        return transferToContract(_to, _value, empty);
    }
    else {
        return transferToAddress(_to, _value, empty);
    }
  }

  //assemble the given address bytecode. If bytecode exists then the _addr is a contract.
  function isContract(address _addr) private view returns (bool is_contract) {
      uint length;
      assembly {
            //retrieve the size of the code on target address, this needs assembly
            length := extcodesize(_addr)
      }
      return (length>0);
    }

  //function that is called when transaction target is an address
  function transferToAddress(address _to, uint _value, bytes _data) private returns (bool success) {
    if (balanceOf(msg.sender) < _value) revert();
    balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
    balances[_to] = safeAdd(balanceOf(_to), _value);
    emit Transfer(msg.sender, _to, _value, _data);
    return true;
  }
  
  //function that is called when transaction target is a contract
  function transferToContract(address _to, uint _value, bytes _data) private returns (bool success) {
    if (balanceOf(msg.sender) < _value) revert();
    balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
    balances[_to] = safeAdd(balanceOf(_to), _value);
    ContractReceiver receiver = ContractReceiver(_to);
    receiver.tokenFallback(msg.sender, _value, _data);
    emit Transfer(msg.sender, _to, _value, _data);
    return true;
  }

  function balanceOf(address _owner) public view returns (uint balance) {
    return balances[_owner];
  }

}

contract QZToken is ERC223Token {
    /* Initializes contract with initial supply tokens to the creator of the contract */
    function QZToken(string tokenName, string tokenSymbol, uint8 decimalUnits, uint256 initialSupply) public {
        name = tokenName; // Set the name for display purposes
        symbol = tokenSymbol; // Set the symbol for display purposes
        decimals = decimalUnits; // Amount of decimals for display purposes
        totalSupply = initialSupply * 10 ** uint(decimalUnits); // Update total supply
        balances[msg.sender] = totalSupply; // Give the creator all initial tokens
    }
}