pragma solidity ^0.4.11;

library SafeMath {
  function mul(uint a, uint b) internal returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint a, uint b) internal returns (uint) {
    assert(b > 0);
    uint c = a / b;
    assert(a == b * c + a % b);
    return c;
  }

  function sub(uint a, uint b) internal returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function add(uint a, uint b) internal returns (uint) {
    uint c = a + b;
    assert(c >= a);
    return c;
  }

  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }

  function assert(bool assertion) internal {
    if (!assertion) {
      throw;
    }
  }
}

contract ERC20Basic {
  uint public totalSupply;
  function balanceOf(address who) constant returns (uint);
  function transfer(address to, uint value);
  event Transfer(address indexed from, address indexed to, uint value);
}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint);
  function transferFrom(address from, address to, uint value);
  function approve(address spender, uint value);
  event Approval(address indexed owner, address indexed spender, uint value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint;

  mapping(address => uint) balances;

  /*
   * Fix for the ERC20 short address attack  
   */
  modifier onlyPayloadSize(uint size) {
     if(msg.data.length < size + 4) {
       throw;
     }
     _;
  }

  function transfer(address _to, uint _value) onlyPayloadSize(2 * 32) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
  }

  function balanceOf(address _owner) constant returns (uint balance) {
    return balances[_owner];
  }
  
}

contract StandardToken is BasicToken, ERC20 {

  mapping (address => mapping (address => uint)) allowed;

  function transferFrom(address _from, address _to, uint _value) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // if (_value > _allowance) throw;

    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
  }

  function approve(address _spender, uint _value) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
  }

  function allowance(address _owner, address _spender) constant returns (uint remaining) {
    return allowed[_owner][_spender];
  }

}

contract ATL is StandardToken {

  string public name = "ATLANT Token";
  string public symbol = "ATL";
  uint public decimals = 18;
  uint constant TOKEN_LIMIT = 150 * 1e6 * 1e18;

  address public ico;

  bool public tokensAreFrozen = true;

  function ATL(address _ico) {
    ico = _ico;
  }

  function mint(address _holder, uint _value) external {
    require(msg.sender == ico);
    require(_value != 0);
    require(totalSupply + _value <= TOKEN_LIMIT);

    balances[_holder] += _value;
    totalSupply += _value;
    Transfer(0x0, _holder, _value);
  }

  function unfreeze() external {
    require(msg.sender == ico);
    tokensAreFrozen = false;
  }

  function transfer(address _to, uint _value) public {
    require(!tokensAreFrozen);
    super.transfer(_to, _value);
  }


  function transferFrom(address _from, address _to, uint _value) public {
    require(!tokensAreFrozen);
    super.transferFrom(_from, _to, _value);
  }


  function approve(address _spender, uint _value) public {
    require(!tokensAreFrozen);
    super.approve(_spender, _value);
  }
}