Contract Source Code:
File 1 of 1 : QRL_Token
pragma solidity ^0.4.11;
// Standard token interface (ERC 20)
// https://github.com/ethereum/EIPs/issues/20
contract Token {
// Functions:
/// @return total amount of tokens
function totalSupply() constant returns (uint256 supply) {}
/// @param _owner The address from which the balance will be retrieved
/// @return The balance
function balanceOf(address _owner) constant returns (uint256 balance) {}
/// @notice send `_value` token to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transfer(address _to, uint256 _value) returns (bool success) {}
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
/// @param _from The address of the sender
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}
/// @notice `msg.sender` approves `_addr` to spend `_value` tokens
/// @param _spender The address of the account able to transfer the tokens
/// @param _value The amount of wei to be approved for transfer
/// @return Whether the approval was successful or not
function approve(address _spender, uint256 _value) returns (bool success) {}
/// @param _owner The address of the account owning tokens
/// @param _spender The address of the account able to transfer the tokens
/// @return Amount of remaining tokens allowed to spent
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}
// Events:
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
contract StdToken is Token {
// Fields:
mapping(address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
uint256 public allSupply = 0;
// Functions:
function transfer(address _to, uint256 _value) returns (bool success) {
if((balances[msg.sender] >= _value) && (balances[_to] + _value > balances[_to])){
balances[msg.sender] -= _value;
balances[_to] += _value;
Transfer(msg.sender, _to, _value);
return true;
} else {
return false;
}
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
if((balances[_from] >= _value) && (allowed[_from][msg.sender] >= _value) && (balances[_to] + _value > balances[_to])){
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
} else {
return false;
}
}
function balanceOf(address _owner) constant returns (uint256 balance) {
return balances[_owner];
}
function approve(address _spender, uint256 _value) returns (bool success) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
function totalSupply() constant returns (uint256 supplyOut) {
supplyOut = allSupply;
return;
}
}
contract QRL_Token is StdToken {
string public name = "QRL";
uint public decimals = 8;
string public symbol = "QRL";
address public creator = 0x0;
uint freezeblock = 0;
modifier notFrozen() {
if ((freezeblock != 0) && (block.number > freezeblock)) throw;
_;
}
modifier onlyPayloadSize(uint numwords) {
if (msg.data.length != numwords * 32 + 4) throw;
_;
}
modifier onlyInState(State state){
if(currentState!=state)
throw;
_;
}
modifier onlyByCreator(){
if(msg.sender!=creator)
throw;
_;
}
// Functions:
function transfer(address _to, uint256 _value) notFrozen onlyPayloadSize(2) returns (bool success) {
if((balances[msg.sender] >= _value) && (balances[_to] + _value > balances[_to])){
balances[msg.sender] -= _value;
balances[_to] += _value;
Transfer(msg.sender, _to, _value);
return true;
} else {
return false;
}
}
function transferFrom(address _from, address _to, uint256 _value) notFrozen onlyPayloadSize(2) returns (bool success) {
if((balances[_from] >= _value) && (allowed[_from][msg.sender] >= _value) && (balances[_to] + _value > balances[_to])){
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
} else {
return false;
}
}
function approve(address _spender, uint256 _value) returns (bool success) {
//require user to set to zero before resetting to nonzero
if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) {
return false;
}
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function QRL_Token(){
creator = msg.sender;
}
enum State {
Start,
Closed
}
State public currentState = State.Start;
function freeze(uint fb) onlyByCreator {
freezeblock = fb;
}
function issueTokens(address forAddress, uint tokenCount) onlyInState(State.Start) onlyByCreator{
balances[forAddress]=tokenCount;
// This is removed for optimization (lower gas consumption for each call)
// Please see 'setAllSupply' function
//
// allBalances+=tokenCount
}
// This is called to close the contract (so no one could mint more tokens)
function close() onlyInState(State.Start) onlyByCreator{
currentState = State.Closed;
}
function setAllSupply(uint data) onlyInState(State.Start) onlyByCreator{
allSupply = data;
}
function changeCreator(address newCreator) onlyByCreator{
creator = newCreator;
}
}