pragma solidity ^0.4.10; /** * Math operations with safety checks */ contract SafeMath { function safeMul(uint256 a, uint256 b) internal returns (uint256) { uint256 c = a * b; assert(a == 0 || c / a == b); return c; } function safeDiv(uint256 a, uint256 b) internal returns (uint256) { assert(b > 0); uint256 c = a / b; assert(a == b * c + a % b); return c; } function safeSub(uint256 a, uint256 b) internal returns (uint256) { assert(b <= a); return a - b; } function safeAdd(uint256 a, uint256 b) internal returns (uint256) { uint256 c = a + b; assert(c>=a && c>=b); return c; } function assert(bool assertion) internal { if (!assertion) { throw; } } } contract BNB is SafeMath{ string public name; string public symbol; uint8 public decimals; uint256 public totalSupply; 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 BNB( uint256 initialSupply, string tokenName, uint8 decimalUnits, string tokenSymbol ) { balanceOf[msg.sender] = initialSupply; // Give the creator all initial tokens totalSupply = initialSupply; // Update total supply name = tokenName; // Set the name for display purposes symbol = tokenSymbol; // Set the symbol for display purposes decimals = decimalUnits; // Amount of decimals for display purposes owner = msg.sender; } /* Send coins */ function transfer(address _to, uint256 _value) { if (_to == 0x0) throw; // Prevent transfer to 0x0 address. Use burn() instead if (_value <= 0) throw; if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows 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) returns (bool success) { if (_value <= 0) throw; allowance[msg.sender][_spender] = _value; return true; } /* A contract attempts to get the coins */ function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { if (_to == 0x0) throw; // Prevent transfer to 0x0 address. Use burn() instead if (_value <= 0) throw; if (balanceOf[_from] < _value) throw; // Check if the sender has enough if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows if (_value > allowance[_from][msg.sender]) throw; // Check allowance 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) returns (bool success) { if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough if (_value <= 0) throw; 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) returns (bool success) { if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough if (_value <= 0) throw; 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) returns (bool success) { if (freezeOf[msg.sender] < _value) throw; // Check if the sender has enough if (_value <= 0) throw; 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) { if(msg.sender != owner)throw; owner.transfer(amount); } // can accept ether function() payable { } }
0.4.10