编译器
0.4.21+commit.dfe3193c
文件 1 的 3:EIP20.sol
pragma solidity ^0.4.21;
import "./EIP20Interface.sol";
contract EIP20 is EIP20Interface {
uint256 constant private MAX_UINT256 = 2**256 - 1;
mapping (address => uint256) public balances;
mapping (address => mapping (address => uint256)) public allowed;
string public name;
uint8 public decimals;
string public symbol;
function EIP20(
uint256 _initialAmount,
string _tokenName,
uint8 _decimalUnits,
string _tokenSymbol
) public {
balances[msg.sender] = _initialAmount;
totalSupply = _initialAmount;
name = _tokenName;
decimals = _decimalUnits;
symbol = _tokenSymbol;
}
function transfer(address _to, uint256 _value) public returns (bool success) {
require(balances[msg.sender] >= _value);
balances[msg.sender] -= _value;
balances[_to] += _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
uint256 allowance = allowed[_from][msg.sender];
require(balances[_from] >= _value && allowance >= _value);
balances[_to] += _value;
balances[_from] -= _value;
if (allowance < MAX_UINT256) {
allowed[_from][msg.sender] -= _value;
}
emit Transfer(_from, _to, _value);
return true;
}
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
function approve(address _spender, uint256 _value) public returns (bool success) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
文件 2 的 3:EIP20Factory.sol
import "./EIP20.sol";
pragma solidity ^0.4.21;
contract EIP20Factory {
mapping(address => address[]) public created;
mapping(address => bool) public isEIP20;
bytes public EIP20ByteCode;
function EIP20Factory() public {
address verifiedToken = createEIP20(10000, "Verify Token", 3, "VTX");
EIP20ByteCode = codeAt(verifiedToken);
}
function verifyEIP20(address _tokenContract) public view returns (bool) {
bytes memory fetchedTokenByteCode = codeAt(_tokenContract);
if (fetchedTokenByteCode.length != EIP20ByteCode.length) {
return false;
}
for (uint i = 0; i < fetchedTokenByteCode.length; i++) {
if (fetchedTokenByteCode[i] != EIP20ByteCode[i]) {
return false;
}
}
return true;
}
function createEIP20(uint256 _initialAmount, string _name, uint8 _decimals, string _symbol)
public
returns (address) {
EIP20 newToken = (new EIP20(_initialAmount, _name, _decimals, _symbol));
created[msg.sender].push(address(newToken));
isEIP20[address(newToken)] = true;
newToken.transfer(msg.sender, _initialAmount);
return address(newToken);
}
function codeAt(address _addr) internal view returns (bytes outputCode) {
assembly {
let size := extcodesize(_addr)
outputCode := mload(0x40)
mstore(0x40, add(outputCode, and(add(add(size, 0x20), 0x1f), not(0x1f))))
mstore(outputCode, size)
extcodecopy(_addr, add(outputCode, 0x20), 0, size)
}
}
}
文件 3 的 3:EIP20Interface.sol
pragma solidity ^0.4.21;
contract EIP20Interface {
uint256 public totalSupply;
function balanceOf(address _owner) public view returns (uint256 balance);
function transfer(address _to, uint256 _value) public returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
function approve(address _spender, uint256 _value) public returns (bool success);
function allowance(address _owner, address _spender) public view returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
{
"compilationTarget": {
"EIP20.sol": "EIP20"
},
"evmVersion": "byzantium",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 0
},
"remappings": []
}
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