Contract Name:
CoinCrowdToken
Contract Source Code:
File 1 of 1 : CoinCrowdToken
pragma solidity ^0.4.18;
/**
* CoinCrowd Token (XCC). More info www.coincrowd.it
*/
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
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); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
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;
}
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() internal {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
/**
* @title Authorizable
* @dev The Authorizable contract has authorized addresses, and provides basic authorization control
* functions, this simplifies the implementation of "multiple user permissions".
*/
contract Authorizable is Ownable {
mapping(address => bool) public authorized;
event AuthorizationSet(address indexed addressAuthorized, bool indexed authorization);
/**
* @dev The Authorizable constructor sets the first `authorized` of the contract to the sender
* account.
*/
function Authorizable() public {
authorized[msg.sender] = true;
}
/**
* @dev Throws if called by any account other than the authorized.
*/
modifier onlyAuthorized() {
require(authorized[msg.sender]);
_;
}
/**
* @dev Allows the current owner to set an authorization.
* @param addressAuthorized The address to change authorization.
*/
function setAuthorized(address addressAuthorized, bool authorization) onlyOwner public {
AuthorizationSet(addressAuthorized, authorization);
authorized[addressAuthorized] = authorization;
}
}
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
uint256 public totalSupply;
function balanceOf(address who) public constant returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) public constant returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
/**
* @dev transfer token from an address to another specified address
* @param _sender The address to transfer from.
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transferFunction(address _sender, address _to, uint256 _value) internal returns (bool) {
require(_to != address(0));
require(_to != address(this));
require(_value <= balances[_sender]);
// SafeMath.sub will throw if there is not enough balance.
balances[_sender] = balances[_sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(_sender, _to, _value);
return true;
}
/**
* @dev transfer token for a specified address (BasicToken transfer method)
*/
function transfer(address _to, uint256 _value) public returns (bool) {
return transferFunction(msg.sender, _to, _value);
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public constant returns (uint256 balance) {
return balances[_owner];
}
}
contract ERC223TokenCompatible is BasicToken {
using SafeMath for uint256;
event Transfer(address indexed from, address indexed to, uint256 value, bytes indexed data);
// Function that is called when a user or another contract wants to transfer funds .
function transfer(address _to, uint256 _value, bytes _data, string _custom_fallback) public returns (bool success) {
require(_to != address(0));
require(_to != address(this));
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
if( isContract(_to) ) {
_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data);
}
Transfer(msg.sender, _to, _value, _data);
return true;
}
// Function that is called when a user or another contract wants to transfer funds .
function transfer(address _to, uint256 _value, bytes _data) public returns (bool success) {
return transfer( _to, _value, _data, "tokenFallback(address,uint256,bytes)");
}
//assemble the given address bytecode. If bytecode exists then the _addr is a contract.
function isContract(address _addr) private view returns (bool is_contract) {
uint256 length;
assembly {
//retrieve the size of the code on target address, this needs assembly
length := extcodesize(_addr)
}
return (length>0);
}
}
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract StandardToken is ERC20, BasicToken {
mapping (address => mapping (address => uint256)) internal allowed;
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amount of tokens to be transferred
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_to != address(this));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
*
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
/**
* approve should be called when allowed[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
*/
function increaseApproval (address _spender, uint _addedValue) public returns (bool success) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval (address _spender, uint _subtractedValue) public returns (bool success) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
/**
* @title Startable
* @dev Base contract which allows owner to implement an start mechanism without ever being stopped more.
*/
contract Startable is Ownable, Authorizable {
event Start();
bool public started = false;
/**
* @dev Modifier to make a function callable only when the contract is started.
*/
modifier whenStarted() {
require( started || authorized[msg.sender] );
_;
}
/**
* @dev called by the owner to start, go to normal state
*/
function start() onlyOwner public {
started = true;
Start();
}
}
/**
* @title Startable token
*
* @dev StandardToken modified with startable transfers.
**/
contract StartToken is Startable, ERC223TokenCompatible, StandardToken {
function transfer(address _to, uint256 _value) public whenStarted returns (bool) {
return super.transfer(_to, _value);
}
function transfer(address _to, uint256 _value, bytes _data) public whenStarted returns (bool) {
return super.transfer(_to, _value, _data);
}
function transfer(address _to, uint256 _value, bytes _data, string _custom_fallback) public whenStarted returns (bool) {
return super.transfer(_to, _value, _data, _custom_fallback);
}
function transferFrom(address _from, address _to, uint256 _value) public whenStarted returns (bool) {
return super.transferFrom(_from, _to, _value);
}
function approve(address _spender, uint256 _value) public whenStarted returns (bool) {
return super.approve(_spender, _value);
}
function increaseApproval(address _spender, uint _addedValue) public whenStarted returns (bool success) {
return super.increaseApproval(_spender, _addedValue);
}
function decreaseApproval(address _spender, uint _subtractedValue) public whenStarted returns (bool success) {
return super.decreaseApproval(_spender, _subtractedValue);
}
}
contract HumanStandardToken is StandardToken, StartToken {
/* Approves and then calls the receiving contract */
function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
approve(_spender, _value);
require(_spender.call(bytes4(keccak256("receiveApproval(address,uint256,bytes)")), msg.sender, _value, _extraData));
return true;
}
}
contract BurnToken is StandardToken {
event Burn(address indexed burner, uint256 value);
/**
* @dev Function to burn tokens.
* @param _burner The address of token holder.
* @param _value The amount of token to be burned.
*/
function burnFunction(address _burner, uint256 _value) internal returns (bool) {
require(_value > 0);
require(_value <= balances[_burner]);
// no need to require value <= totalSupply, since that would imply the
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
balances[_burner] = balances[_burner].sub(_value);
totalSupply = totalSupply.sub(_value);
Burn(_burner, _value);
return true;
}
/**
* @dev Burns a specific amount of tokens.
* @param _value The amount of token to be burned.
*/
function burn(uint256 _value) public returns(bool) {
return burnFunction(msg.sender, _value);
}
/**
* @dev Burns tokens from one address
* @param _from address The address which you want to burn tokens from
* @param _value uint256 the amount of tokens to be burned
*/
function burnFrom(address _from, uint256 _value) public returns (bool) {
require(_value <= allowed[_from][msg.sender]); // check if it has the budget allowed
burnFunction(_from, _value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
return true;
}
}
contract OriginToken is Authorizable, BasicToken, BurnToken {
/**
* @dev transfer token from tx.orgin to a specified address (onlyAuthorized contract)
*/
function originTransfer(address _to, uint256 _value) onlyAuthorized public returns (bool) {
return transferFunction(tx.origin, _to, _value);
}
/**
* @dev Burns a specific amount of tokens from tx.orgin. (onlyAuthorized contract)
* @param _value The amount of token to be burned.
*/
function originBurn(uint256 _value) onlyAuthorized public returns(bool) {
return burnFunction(tx.origin, _value);
}
}
contract CoinCrowdToken is ERC223TokenCompatible, StandardToken, StartToken, HumanStandardToken, BurnToken, OriginToken {
uint8 public decimals = 18;
string public name = "CoinCrowd";
string public symbol = "XCC";
uint256 public initialSupply;
function CoinCrowdToken() public {
totalSupply = 100000000 * 10 ** uint(decimals);
initialSupply = totalSupply;
balances[msg.sender] = totalSupply;
}
}