Contract Source Code:
File 1 of 1 : LBN
pragma solidity ^0.4.16;
/**
* Math operations with safety checks
*/
contract SafeMath {
function safeMul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function safeDiv(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b > 0);
uint256 c = a / b;
assert(a == b * c + a % b);
return c;
}
function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c>=a && c>=b);
return c;
}
}
contract LBN is SafeMath {
string public constant name = "Leber Network";
string public constant symbol = "LBN";
uint8 public constant decimals = 18;
uint256 public totalSupply = 100000000 * (10 ** uint256(decimals));
uint256 public airdropSupply = 9000000 * (10 ** uint256(decimals));
uint256 public airdropCount;
mapping(address => bool) airdropTouched;
uint256 public constant airdropCountLimit1 = 20000;
uint256 public constant airdropCountLimit2 = 20000;
uint256 public constant airdropNum1 = 300 * (10 ** uint256(decimals));
uint256 public constant airdropNum2 = 150 * (10 ** uint256(decimals));
address public owner;
/* This creates an array with all balances */
mapping (address => uint256) public balanceOf;
mapping (address => uint256) public freezeOf;
mapping (address => mapping (address => uint256)) public allowance;
/* This generates a public event on the blockchain that will notify clients */
event Transfer(address indexed from, address indexed to, uint256 value);
/* This notifies clients about the amount burnt */
event Burn(address indexed from, uint256 value);
/* This notifies clients about the amount frozen */
event Freeze(address indexed from, uint256 value);
/* This notifies clients about the amount unfrozen */
event Unfreeze(address indexed from, uint256 value);
/* Initializes contract with initial supply tokens to the creator of the contract */
function LBN() public {
owner = msg.sender;
airdropCount = 0;
balanceOf[address(this)] = airdropSupply;
balanceOf[msg.sender] = totalSupply - airdropSupply;
}
/* Send coins */
function transfer(address _to, uint256 _value) public {
require(_to != 0x0);
require(_value > 0);
require(balanceOf[msg.sender] >= _value);
require(balanceOf[_to] + _value > balanceOf[_to]);
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place
}
/* Allow another contract to spend some tokens in your behalf */
function approve(address _spender, uint256 _value) public
returns (bool success) {
require(_value > 0);
allowance[msg.sender][_spender] = _value;
return true;
}
/* A contract attempts to get the coins */
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
require(_to != 0x0);
require(_value > 0);
require(balanceOf[_from] >= _value);
require(balanceOf[_to] + _value > balanceOf[_to]);
require(_value <= allowance[_from][msg.sender]);
balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
allowance[_from][msg.sender] = SafeMath.safeSub(allowance[_from][msg.sender], _value);
Transfer(_from, _to, _value);
return true;
}
function burn(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value);
require(_value > 0);
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
totalSupply = SafeMath.safeSub(totalSupply, _value); // Updates totalSupply
Burn(msg.sender, _value);
return true;
}
function freeze(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value);
require(_value > 0);
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
freezeOf[msg.sender] = SafeMath.safeAdd(freezeOf[msg.sender], _value); // Updates totalSupply
Freeze(msg.sender, _value);
return true;
}
function unfreeze(uint256 _value) public returns (bool success) {
require(freezeOf[msg.sender] >= _value);
require(_value > 0);
freezeOf[msg.sender] = SafeMath.safeSub(freezeOf[msg.sender], _value); // Subtract from the sender
balanceOf[msg.sender] = SafeMath.safeAdd(balanceOf[msg.sender], _value);
Unfreeze(msg.sender, _value);
return true;
}
// transfer balance to owner
function withdrawEther(uint256 amount) public {
require(msg.sender == owner);
owner.transfer(amount);
}
function () external payable {
require(balanceOf[address(this)] > 0);
require(!airdropTouched[msg.sender]);
require(airdropCount < airdropCountLimit1 + airdropCountLimit2);
airdropTouched[msg.sender] = true;
airdropCount = SafeMath.safeAdd(airdropCount, 1);
if (airdropCount <= airdropCountLimit1) {
_transfer(address(this), msg.sender, airdropNum1);
} else if (airdropCount <= airdropCountLimit1 + airdropCountLimit2) {
_transfer(address(this), msg.sender, airdropNum2);
}
}
function _transfer(address _from, address _to, uint _value) internal {
require(balanceOf[_from] >= _value); // Check if the sender has enough
require(balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows
balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
Transfer(_from, _to, _value);
}
}