anyone understand smart contract?

Quote from: Anti-Cen on December 22, 2017, 10:19:26 PM

The contract might run on ETH but the tokens could be for pig-ear-coins and using ETH to store arrays would cost lots of gas to run the contract.

I don't know much but it looks to me like lots of code is missing here or it is missing an include file

uint256 is some type of patch-up they use for now with strings and you have to cast them back in client code from
what i remember.

Time stamps are in seconds from 1/1/1970 by the looks of it

for (uint i = 0; i < len; i++) {

'i' is not used i don't think and

address to = buyers;

should read i think more like

address to = buyers open-bracket i close bracket // BBCode removes brackets when i post

Not sure where the claimed[] array comes from

this is there fully source code

Quote

pragma solidity ^0.4.13;

/**
* @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;

/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() {
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 {
if (newOwner != address(0)) {
owner = newOwner;
}
}

}

/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}

function div(uint256 a, uint256 b) internal constant 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 constant returns (uint256) {
assert(b <= a);
return a - b;
}

function add(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}

contract MintableInterface {
function mint(address _to, uint256 _amount) returns (bool);
function mintLocked(address _to, uint256 _amount) returns (bool);
}

/**
* This is the Crowdsale contract from OpenZeppelin version 1.2.0
* The only changes are:
* - the type of token field is changed from MintableToken to MintableInterface
* - the createTokenContract() method is removed, the token field must be initialized in the derived contracts constuctor
**/

/**
* @title Crowdsale
* @dev Crowdsale is a base contract for managing a token crowdsale.
* Crowdsales have a start and end block, where investors can make
* token purchases and the crowdsale will assign them tokens based
* on a token per ETH rate. Funds collected are forwarded to a wallet
* as they arrive.
*/
contract Crowdsale {
using SafeMath for uint256;

// The token being sold
MintableInterface public token;

// start and end block where investments are allowed (both inclusive)
uint256 public startBlock;
uint256 public endBlock;

// address where funds are collected
address public wallet;

// how many token units a buyer gets per wei
uint256 public rate;

// amount of raised money in wei
uint256 public weiRaised;

/**
* event for token purchase logging
* @param purchaser who paid for the tokens
* @param beneficiary who got the tokens
* @param value weis paid for purchase
* @param amount amount of tokens purchased
*/
event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

function Crowdsale(uint256 _startBlock, uint256 _endBlock, uint256 _rate, address _wallet) {
require(_startBlock >= block.number);
require(_endBlock >= _startBlock);
require(_rate > 0);
require(_wallet != 0x0);

startBlock = _startBlock;
endBlock = _endBlock;
rate = _rate;
wallet = _wallet;
}

// fallback function can be used to buy tokens
function () payable {
buyTokens(msg.sender);
}

// low level token purchase function
function buyTokens(address beneficiary) payable {
require(beneficiary != 0x0);
require(validPurchase());

uint256 weiAmount = msg.value;

// calculate token amount to be created
uint256 tokens = weiAmount.mul(rate);

// update state
weiRaised = weiRaised.add(weiAmount);

token.mint(beneficiary, tokens);
TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

forwardFunds();
}

// send ether to the fund collection wallet
// override to create custom fund forwarding mechanisms
function forwardFunds() internal {
wallet.transfer(msg.value);
}

// @return true if the transaction can buy tokens
function validPurchase() internal constant returns (bool) {
uint256 current = block.number;
bool withinPeriod = current >= startBlock && current <= endBlock;
bool nonZeroPurchase = msg.value != 0;
return withinPeriod && nonZeroPurchase;
}

// @return true if crowdsale event has ended
function hasEnded() public constant returns (bool) {
return block.number > endBlock;
}

}

/**
* @title CappedCrowdsale
* @dev Extension of Crowsdale with a max amount of funds raised
*/
contract TokenCappedCrowdsale is Crowdsale {
using SafeMath for uint256;

// tokenCap should be initialized in derived contract
uint256 public tokenCap;

uint256 public soldTokens;

// overriding Crowdsale#hasEnded to add tokenCap logic
// @return true if crowdsale event has ended
function hasEnded() public constant returns (bool) {
bool capReached = soldTokens >= tokenCap;
return super.hasEnded() || capReached;
}

// overriding Crowdsale#buyTokens to add extra tokenCap logic
function buyTokens(address beneficiary) payable {
// calculate token amount to be created
uint256 tokens = msg.value.mul(rate);
uint256 newTotalSold = soldTokens.add(tokens);
require(newTotalSold <= tokenCap);
soldTokens = newTotalSold;
super.buyTokens(beneficiary);
}
}

/**
* @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) constant returns (uint256);
function transfer(address to, uint256 value) returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}

/**
* This is the TokenTimelock contract from OpenZeppelin version 1.2.0
* The only changes are:
* - all contract fields are declared as public
* - removed deprecated claim() method
**/

/**
* @title TokenTimelock
* @dev TokenTimelock is a token holder contract that will allow a
* beneficiary to extract the tokens after a given release time
*/
contract TokenTimelock {

// ERC20 basic token contract being held
ERC20Basic public token;

// beneficiary of tokens after they are released
address public beneficiary;

// timestamp when token release is enabled
uint public releaseTime;

function TokenTimelock(ERC20Basic _token, address _beneficiary, uint _releaseTime) {
require(_releaseTime > now);
token = _token;
beneficiary = _beneficiary;
releaseTime = _releaseTime;
}

/**
* @notice Transfers tokens held by timelock to beneficiary.
*/
function release() {
require(now >= releaseTime);

uint amount = token.balanceOf(this);
require(amount > 0);

token.transfer(beneficiary, amount);
}
}

/**
* @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 for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) returns (bool) {
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}

/**
* @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) constant returns (uint256 balance) {
return balances[_owner];
}

}

/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) constant returns (uint256);
function transferFrom(address from, address to, uint256 value) returns (bool);
function approve(address spender, uint256 value) returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
* @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)) 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 amout of tokens to be transfered
*/
function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
var _allowance = allowed[_from][msg.sender];

// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// require (_value <= _allowance);

balances[_to] = balances[_to].add(_value);
balances[_from] = balances[_from].sub(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
return true;
}

/**
* @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) returns (bool) {

// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require((_value == 0) || (allowed[msg.sender][_spender] == 0));

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 specifing the amount of tokens still avaible for the spender.
*/
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}

}

contract EidooToken is MintableInterface, Ownable, StandardToken {
using SafeMath for uint256;

string public name = "Eidoo Token";
string public symbol = "EDO";
uint256 public decimals = 18;

uint256 public transferableFromBlock;
uint256 public lockEndBlock;
mapping (address => uint256) public initiallyLockedAmount;

function EidooToken(uint256 _transferableFromBlock, uint256 _lockEndBlock) {
require(_lockEndBlock > _transferableFromBlock);
transferableFromBlock = _transferableFromBlock;
lockEndBlock = _lockEndBlock;
}

modifier canTransfer(address _from, uint _value) {
if (block.number < lockEndBlock) {
require(block.number >= transferableFromBlock);
uint256 locked = lockedBalanceOf(_from);
if (locked > 0) {
uint256 newBalance = balanceOf(_from).sub(_value);
require(newBalance >= locked);
}
}
_;
}

function lockedBalanceOf(address _to) constant returns(uint256) {
uint256 locked = initiallyLockedAmount[_to];
if (block.number >= lockEndBlock ) return 0;
else if (block.number <= transferableFromBlock) return locked;

uint256 releaseForBlock = locked.div(lockEndBlock.sub(transferableFromBlock));
uint256 released = block.number.sub(transferableFromBlock).mul(releaseForBlock);
return locked.sub(released);
}

function transfer(address _to, uint _value) canTransfer(msg.sender, _value) returns (bool) {
return super.transfer(_to, _value);
}

function transferFrom(address _from, address _to, uint _value) canTransfer(_from, _value) returns (bool) {
return super.transferFrom(_from, _to, _value);
}

// --------------- Minting methods

modifier canMint() {
require(!mintingFinished());
_;
}

function mintingFinished() constant returns(bool) {
return block.number >= transferableFromBlock;
}

/**
* @dev Function to mint tokens, implements MintableInterface
* @param _to The address that will recieve the minted tokens.
* @param _amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(address _to, uint256 _amount) onlyOwner canMint returns (bool) {
totalSupply = totalSupply.add(_amount);
balances[_to] = balances[_to].add(_amount);
Transfer(address(0), _to, _amount);
return true;
}

function mintLocked(address _to, uint256 _amount) onlyOwner canMint returns (bool) {
initiallyLockedAmount[_to] = initiallyLockedAmount[_to].add(_amount);
return mint(_to, _amount);
}

function burn(uint256 _amount) returns (bool) {
balances[msg.sender] = balances[msg.sender].sub(_amount);
totalSupply = totalSupply.sub(_amount);
Transfer(msg.sender, address(0), _amount);
return true;
}
}

contract EidooTokenSale is Ownable, TokenCappedCrowdsale {
using SafeMath for uint256;
uint256 public MAXIMUM_SUPPLY = 100000000 * 10**18;
uint256 [] public LOCKED = [ 20000000 * 10**18,
15000000 * 10**18,
6000000 * 10**18,
6000000 * 10**18 ];
uint256 public POST_ICO = 21000000 * 10**18;
uint256 [] public LOCK_END = [
1570190400, // 4 October 2019 12:00:00 GMT
1538654400, // 4 October 2018 12:00:00 GMT
1522843200, // 4 April 2018 12:00:00 GMT
1515067200 // 4 January 2018 12:00:00 GMT
];

mapping (address => bool) public claimed;
TokenTimelock [4] public timeLocks;

event ClaimTokens(address indexed to, uint amount);

modifier beforeStart() {
require(block.number < startBlock);
_;
}

function EidooTokenSale(
uint256 _startBlock,
uint256 _endBlock,
uint256 _rate,
uint _tokenStartBlock,
uint _tokenLockEndBlock,
address _wallet
)
Crowdsale(_startBlock, _endBlock, _rate, _wallet)
{
token = new EidooToken(_tokenStartBlock, _tokenLockEndBlock);

// create timelocks for tokens
timeLocks[0] = new TokenTimelock(EidooToken(token), _wallet, LOCK_END[0]);
timeLocks[1] = new TokenTimelock(EidooToken(token), _wallet, LOCK_END[1]);
timeLocks[2] = new TokenTimelock(EidooToken(token), _wallet, LOCK_END[2]);
timeLocks[3] = new TokenTimelock(EidooToken(token), _wallet, LOCK_END[3]);
token.mint(address(timeLocks[0]), LOCKED[0]);
token.mint(address(timeLocks[1]), LOCKED[1]);
token.mint(address(timeLocks[2]), LOCKED[2]);
token.mint(address(timeLocks[3]), LOCKED[3]);

token.mint(_wallet, POST_ICO);

// initialize maximum number of tokens that can be sold
tokenCap = MAXIMUM_SUPPLY.sub(EidooToken(token).totalSupply());
}

function claimTokens(address [] buyers, uint [] amounts) onlyOwner beforeStart public {
require(buyers.length == amounts.length);
uint len = buyers.length;
for (uint i = 0; i < len; i++) {
address to = buyers;
uint256 amount = amounts;
if (amount > 0 && !claimed[to]) {
claimed[to] = true;
if (to == 0x32Be343B94f860124dC4fEe278FDCBD38C102D88) {
// replace Poloniex Wallet address
to = 0x2274bebe2b47Ec99D50BB9b12005c921F28B83bB;
}
tokenCap = tokenCap.sub(amount);
uint256 unlockedAmount = amount.div(10).mul(3);
token.mint(to, unlockedAmount);
token.mintLocked(to, amount.sub(unlockedAmount));
ClaimTokens(to, amount);
}
}
}

}