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pragma solidity 0.5.7;

contract Ownable {
	address public owner;
	event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

	constructor() public {
		owner = msg.sender;
	}

	modifier onlyOwner() {
		require(msg.sender == owner);
		_;
	}

	function transferOwnership(address newOwner) public onlyOwner {
		require(newOwner != address(0) && newOwner != owner);
		emit OwnershipTransferred(owner, newOwner);
		owner = newOwner;
	}
}

library SafeMath {
	function mul(uint256 a, uint256 b) internal pure returns (uint256) {
		uint256 c = a * b;
		assert(a == 0 || c / a == b);
		return c;
	}

	function div(uint256 a, uint256 b) internal pure returns (uint256) {
		assert(b > 0);
		uint256 c = a / b;
		return c;
	}

	function sub(uint256 a, uint256 b) internal pure returns (uint256) {
		assert(b <= a);
		return a - b;
	}

	function add(uint256 a, uint256 b) internal pure returns (uint256) {
		uint256 c = a + b;
		assert(c >= a);
		return c;
	}
}

contract ERC223ReceivingContract {
	function tokenFallback(address _from, uint256 _value, bytes memory _data) public pure {
		_from;
		_value;
		_data;
	}
}

contract ERC223 {
	event Transfer(address indexed _from, address indexed _to, uint256 _value, bytes _data);
}

contract ERC20 {
	event Transfer(address indexed _from, address indexed _to, uint256 _value);
	event Approval(address indexed _tokenOwner, address indexed _spender, uint _value);
}

// ERC223 https://github.com/Dexaran/ERC223-token-standard
contract StandardToken is ERC20, ERC223, Ownable {
	uint256 public totalSupply;
	using SafeMath for uint256;

	mapping(address => uint256) balances;
	mapping(address => mapping (address => uint256)) internal allowed;

	function transferToAddress(address _to, uint256 _value, bytes memory _data) internal returns (bool) {
		balances[msg.sender] = balances[msg.sender].sub(_value);
		balances[_to] = balances[_to].add(_value);
		emit Transfer(msg.sender, _to, _value);
		emit Transfer(msg.sender, _to, _value, _data);
		return true;
	}

	function transferToContract(address _to, uint256 _value, bytes memory _data) internal returns (bool) {
		balances[msg.sender] = balances[msg.sender].sub(_value);
		balances[_to] = balances[_to].add(_value);
		ERC223ReceivingContract receiver = ERC223ReceivingContract(_to);
		receiver.tokenFallback(msg.sender, _value, _data);
		emit Transfer(msg.sender, _to, _value);
		emit Transfer(msg.sender, _to, _value, _data);
		return true;
	}

	function transfer(address _to, uint256 _value, bytes memory _data) public returns (bool) {
		require(_to != address(0));
		require(_value <= balances[msg.sender]);
		require(_value > 0);

		uint256 codeLength;
		assembly {
			codeLength := extcodesize(_to)
		}
	
		if(codeLength > 0) {
			return transferToContract(_to, _value, _data);
		} else {
			return transferToAddress(_to, _value, _data);
		}
	}

	function transfer(address _to, uint256 _value) public returns (bool) {
		require(_to != address(0));
		require(_value <= balances[msg.sender]);
		require(_value > 0);

		uint256 codeLength;
		bytes memory empty;
		assembly {
			codeLength := extcodesize(_to)
		}

		if(codeLength > 0) {
			return transferToContract(_to, _value, empty);
		} else {
			return transferToAddress(_to, _value, empty);
		}
	}

	function transferFrom(address _from, address _to, uint _value) public returns (bool) {
		require(_to != address(0));
		require(_value > 0);
		require(_value <= balances[_from]);
		require(_value <= allowed[_from][msg.sender]);

		bytes memory empty;

		balances[_from] = balances[_from].sub(_value);
		balances[_to] = balances[_to].add(_value);
		allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
		emit Transfer(_from, _to, _value);
		emit Transfer(_from, _to, _value, empty);
		return true;
	}

	function balanceOf(address _address) public view returns (uint256 balance) {
		return balances[_address];
	}

	function allowance(address _tokenOwner, address _spender) public view returns (uint) {
		return allowed[_tokenOwner][_spender];
	}

	function approve(address _spender, uint _value) public returns (bool) {
		require(_spender != address(0));

		allowed[msg.sender][_spender] = _value;
		emit Approval(msg.sender, _spender, _value);
		return true;
	}
}

contract CFDToken is StandardToken {
	string public constant name = "CFDToken";
	uint public constant decimals = 18;
	string public constant symbol = "CFDM";

	constructor() public {
		totalSupply = 7000000 * (10**decimals);
		owner = msg.sender;
		balances[msg.sender] = 7000000 * (10**decimals);
	}

	function() external {
		revert();
	}
}