ERC-20
Overview
Max Total Supply
0.000135129827152639 SDEX-LP
Holders
10
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0 SDEX-LPValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
SmardexPair
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 999999 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity =0.8.17; // contracts import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol"; // libraries import "@openzeppelin/contracts/utils/math/SafeCast.sol"; import "./libraries/SmardexLibrary.sol"; import "./libraries/TransferHelper.sol"; // interfaces import "./interfaces/ISmardexPair.sol"; import "./interfaces/ISmardexFactory.sol"; import "./interfaces/ISmardexSwapCallback.sol"; import "./interfaces/ISmardexMintCallback.sol"; /** * @title SmardexPair * @notice Pair contract that allows user to swap 2 ERC20-strict tokens in a decentralised and automated way */ contract SmardexPair is ISmardexPair, ERC20Permit { using SafeCast for uint256; using SafeCast for int256; /** * @notice swap parameters used by function swap * @param amountCalculated return amount from getAmountIn/Out is always positive but to avoid too much cast, is int * @param fictiveReserveIn fictive reserve of the in-token of the pair * @param fictiveReserveOut fictive reserve of the out-token of the pair * @param priceAverageIn in-token ratio component of the price average * @param priceAverageOut out-token ratio component of the price average * @param token0 address of the token0 * @param token1 address of the token1 * @param balanceIn contract balance of the in-token * @param balanceOut contract balance of the out-token */ struct SwapParams { int256 amountCalculated; uint256 fictiveReserveIn; uint256 fictiveReserveOut; uint256 priceAverageIn; uint256 priceAverageOut; address token0; address token1; uint256 balanceIn; uint256 balanceOut; } uint8 private constant CONTRACT_UNLOCKED = 1; uint8 private constant CONTRACT_LOCKED = 2; uint256 private constant MINIMUM_LIQUIDITY = 10 ** 3; bytes4 private constant AUTOSWAP_SELECTOR = bytes4(keccak256(bytes("executeWork(address,address)"))); address public factory; address public token0; address public token1; // smardex new fictive reserves uint128 internal fictiveReserve0; uint128 internal fictiveReserve1; // accessible via getFictiveReserves() // moving average on the price uint128 internal priceAverage0; uint128 internal priceAverage1; uint40 internal priceAverageLastTimestamp; // accessible via getPriceAverage() // fee for FEE_POOL uint104 internal feeToAmount0; uint104 internal feeToAmount1; // accessible via getFees() // reentrancy uint8 private lockStatus = CONTRACT_UNLOCKED; modifier lock() { require(lockStatus == CONTRACT_UNLOCKED, "SmarDex: LOCKED"); lockStatus = CONTRACT_LOCKED; _; lockStatus = CONTRACT_UNLOCKED; } constructor() ERC20("SmarDex LP-Token", "SDEX-LP") ERC20Permit("SmarDex LP-Token") { factory = msg.sender; } ///@inheritdoc ISmardexPair function initialize(address _token0, address _token1) external override { require(msg.sender == factory, "SmarDex: FORBIDDEN"); // sufficient check token0 = _token0; token1 = _token1; } ///@inheritdoc ISmardexPair function getReserves() external view override returns (uint256 reserve0_, uint256 reserve1_) { reserve0_ = IERC20(token0).balanceOf(address(this)) - feeToAmount0; reserve1_ = IERC20(token1).balanceOf(address(this)) - feeToAmount1; } ///@inheritdoc ISmardexPair function getFictiveReserves() external view override returns (uint256 fictiveReserve0_, uint256 fictiveReserve1_) { fictiveReserve0_ = fictiveReserve0; fictiveReserve1_ = fictiveReserve1; } ///@inheritdoc ISmardexPair function getFees() external view override returns (uint256 fees0_, uint256 fees1_) { fees0_ = feeToAmount0; fees1_ = feeToAmount1; } ///@inheritdoc ISmardexPair function getPriceAverage() external view returns (uint256 priceAverage0_, uint256 priceAverage1_, uint256 priceAverageLastTimestamp_) { priceAverage0_ = priceAverage0; priceAverage1_ = priceAverage1; priceAverageLastTimestamp_ = priceAverageLastTimestamp; } ///@inheritdoc ISmardexPair function getUpdatedPriceAverage( uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageLastTimestamp, uint256 _priceAverageIn, uint256 _priceAverageOut, uint256 _currentTimestamp ) public pure returns (uint256 priceAverageIn_, uint256 priceAverageOut_) { (priceAverageIn_, priceAverageOut_) = SmardexLibrary.getUpdatedPriceAverage( _fictiveReserveIn, _fictiveReserveOut, _priceAverageLastTimestamp, _priceAverageIn, _priceAverageOut, _currentTimestamp ); } ///@inheritdoc ISmardexPair function mint( address _to, uint256 _amount0, uint256 _amount1, address _payer ) external override returns (uint256 liquidity_) { liquidity_ = _mintBeforeFee(_to, _amount0, _amount1, _payer); // we call feeTo out of the internal locked mint (_mintExt) function to be able to swap fees in here _feeToSwap(); } ///@inheritdoc ISmardexPair function burn(address _to) external override returns (uint256 amount0_, uint256 amount1_) { (amount0_, amount1_) = _burnBeforeFee(_to); // we call feeTo out of the internal locked burn (_burnExt) function to be able to swap fees in here _feeToSwap(); } ///@inheritdoc ISmardexPair function swap( address _to, bool _zeroForOne, int256 _amountSpecified, bytes calldata _data ) external override lock returns (int256 amount0_, int256 amount1_) { require(_amountSpecified != 0, "SmarDex: ZERO_AMOUNT"); SwapParams memory _params = SwapParams({ amountCalculated: 0, fictiveReserveIn: 0, fictiveReserveOut: 0, priceAverageIn: 0, priceAverageOut: 0, token0: token0, token1: token1, balanceIn: 0, balanceOut: 0 }); ( _params.balanceIn, _params.balanceOut, _params.fictiveReserveIn, _params.fictiveReserveOut, _params.priceAverageIn, _params.priceAverageOut ) = _zeroForOne ? ( IERC20(_params.token0).balanceOf(address(this)) - feeToAmount0, IERC20(_params.token1).balanceOf(address(this)) - feeToAmount1, fictiveReserve0, fictiveReserve1, priceAverage0, priceAverage1 ) : ( IERC20(_params.token1).balanceOf(address(this)) - feeToAmount1, IERC20(_params.token0).balanceOf(address(this)) - feeToAmount0, fictiveReserve1, fictiveReserve0, priceAverage1, priceAverage0 ); // compute new price average (_params.priceAverageIn, _params.priceAverageOut) = SmardexLibrary.getUpdatedPriceAverage( _params.fictiveReserveIn, _params.fictiveReserveOut, priceAverageLastTimestamp, _params.priceAverageIn, _params.priceAverageOut, block.timestamp ); // SSTORE new price average (priceAverage0, priceAverage1, priceAverageLastTimestamp) = _zeroForOne ? (_params.priceAverageIn.toUint128(), _params.priceAverageOut.toUint128(), uint40(block.timestamp)) : (_params.priceAverageOut.toUint128(), _params.priceAverageIn.toUint128(), uint40(block.timestamp)); if (_amountSpecified > 0) { uint256 _temp; (_temp, , , _params.fictiveReserveIn, _params.fictiveReserveOut) = SmardexLibrary.getAmountOut( _amountSpecified.toUint256(), _params.balanceIn, _params.balanceOut, _params.fictiveReserveIn, _params.fictiveReserveOut, _params.priceAverageIn, _params.priceAverageOut ); _params.amountCalculated = _temp.toInt256(); } else { uint256 _temp; (_temp, , , _params.fictiveReserveIn, _params.fictiveReserveOut) = SmardexLibrary.getAmountIn( (-_amountSpecified).toUint256(), _params.balanceIn, _params.balanceOut, _params.fictiveReserveIn, _params.fictiveReserveOut, _params.priceAverageIn, _params.priceAverageOut ); _params.amountCalculated = _temp.toInt256(); } (amount0_, amount1_) = _zeroForOne ? ( _amountSpecified > 0 ? (_amountSpecified, -_params.amountCalculated) : (_params.amountCalculated, _amountSpecified) ) : ( _amountSpecified > 0 ? (-_params.amountCalculated, _amountSpecified) : (_amountSpecified, _params.amountCalculated) ); require(_to != _params.token0 && _to != _params.token1, "SmarDex: INVALID_TO"); if (_zeroForOne) { if (amount1_ < 0) { TransferHelper.safeTransfer(_params.token1, _to, uint256(-amount1_)); } ISmardexSwapCallback(msg.sender).smardexSwapCallback(amount0_, amount1_, _data); uint256 _balanceInBefore = _params.balanceIn; _params.balanceIn = IERC20(token0).balanceOf(address(this)); require( _balanceInBefore + feeToAmount0 + (amount0_).toUint256() <= _params.balanceIn, "SmarDex: INSUFFICIENT_TOKEN0_INPUT_AMOUNT" ); _params.balanceOut = IERC20(token1).balanceOf(address(this)); } else { if (amount0_ < 0) { TransferHelper.safeTransfer(_params.token0, _to, uint256(-amount0_)); } ISmardexSwapCallback(msg.sender).smardexSwapCallback(amount0_, amount1_, _data); uint256 _balanceInBefore = _params.balanceIn; _params.balanceIn = IERC20(token1).balanceOf(address(this)); require( _balanceInBefore + feeToAmount1 + (amount1_).toUint256() <= _params.balanceIn, "SmarDex: INSUFFICIENT_TOKEN1_INPUT_AMOUNT" ); _params.balanceOut = IERC20(token0).balanceOf(address(this)); } // update feeTopart bool _feeOn = ISmardexFactory(factory).feeTo() != address(0); if (_zeroForOne) { if (_feeOn) { feeToAmount0 += ((uint256(amount0_) * SmardexLibrary.FEES_POOL) / SmardexLibrary.FEES_BASE).toUint104(); } _update( _params.balanceIn, _params.balanceOut, _params.fictiveReserveIn, _params.fictiveReserveOut, _params.priceAverageIn, _params.priceAverageOut ); } else { if (_feeOn) { feeToAmount1 += ((uint256(amount1_) * SmardexLibrary.FEES_POOL) / SmardexLibrary.FEES_BASE).toUint104(); } _update( _params.balanceOut, _params.balanceIn, _params.fictiveReserveOut, _params.fictiveReserveIn, _params.priceAverageOut, _params.priceAverageIn ); } emit Swap(msg.sender, _to, amount0_, amount1_); } /** * @notice update fictive reserves and emit the Sync event * @param _balance0 the new balance of token0 * @param _balance1 the new balance of token1 * @param _fictiveReserve0 the new fictive reserves of token0 * @param _fictiveReserve1 the new fictive reserves of token1 * @param _priceAverage0 the new priceAverage of token0 * @param _priceAverage1 the new priceAverage of token1 */ function _update( uint256 _balance0, uint256 _balance1, uint256 _fictiveReserve0, uint256 _fictiveReserve1, uint256 _priceAverage0, uint256 _priceAverage1 ) private { require(_fictiveReserve0 > 0 && _fictiveReserve1 > 0, "SmarDex: FICTIVE_RESERVES_TOO_LOW"); require(_fictiveReserve0 <= type(uint128).max && _fictiveReserve1 <= type(uint128).max, "SmarDex: OVERFLOW"); fictiveReserve0 = uint128(_fictiveReserve0); fictiveReserve1 = uint128(_fictiveReserve1); emit Sync( _balance0 - feeToAmount0, _balance1 - feeToAmount1, _fictiveReserve0, _fictiveReserve1, _priceAverage0, _priceAverage1 ); } /** * @notice transfers feeToAmount of tokens 0 and 1 to feeTo, and reset feeToAmounts * @return feeOn_ if part of the fees goes to feeTo */ function _mintFee() private returns (bool feeOn_) { address _feeTo = ISmardexFactory(factory).feeTo(); feeOn_ = _feeTo != address(0); if (feeOn_) { // gas saving uint256 _feeToAmount0 = feeToAmount0; uint256 _feeToAmount1 = feeToAmount1; if (_feeToAmount0 > 0) { TransferHelper.safeTransfer(token0, _feeTo, _feeToAmount0); feeToAmount0 = 0; } if (_feeToAmount1 > 0) { TransferHelper.safeTransfer(token1, _feeTo, _feeToAmount1); feeToAmount1 = 0; } } else { feeToAmount0 = 0; feeToAmount1 = 0; } } /** * @notice Mint lp tokens proportionally of added tokens in balance. * @param _to address who will receive minted tokens * @param _amount0 amount of token0 to provide * @param _amount1 amount of token1 to provide * @param _payer address of the payer to provide token for the mint * @return liquidity_ amount of lp tokens minted and sent to the address defined in parameter */ function _mintBeforeFee( address _to, uint256 _amount0, uint256 _amount1, address _payer ) internal lock returns (uint256 liquidity_) { _mintFee(); uint256 _fictiveReserve0; uint256 _fictiveReserve1; // gas saving uint256 _balance0 = IERC20(token0).balanceOf(address(this)); uint256 _balance1 = IERC20(token1).balanceOf(address(this)); uint256 _totalSupply = totalSupply(); ISmardexMintCallback(msg.sender).smardexMintCallback( ISmardexMintCallback.MintCallbackData({ token0: token0, token1: token1, amount0: _amount0, amount1: _amount1, payer: _payer }) ); // gas savings uint256 _balance0after = IERC20(token0).balanceOf(address(this)); uint256 _balance1after = IERC20(token1).balanceOf(address(this)); require(_balance0after >= _balance0 + _amount0, "SmarDex: INSUFFICIENT_AMOUNT_0"); require(_balance1after >= _balance1 + _amount1, "SmarDex: INSUFFICIENT_AMOUNT_1"); if (_totalSupply == 0) { liquidity_ = Math.sqrt(_amount0 * _amount1) - MINIMUM_LIQUIDITY; _mint(address(0xdead), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens _fictiveReserve0 = _balance0after / 2; _fictiveReserve1 = _balance1after / 2; } else { liquidity_ = Math.min((_amount0 * _totalSupply) / _balance0, (_amount1 * _totalSupply) / _balance1); // update proportionally the fictiveReserves _fictiveReserve0 = (fictiveReserve0 * (_totalSupply + liquidity_)) / _totalSupply; _fictiveReserve1 = (fictiveReserve1 * (_totalSupply + liquidity_)) / _totalSupply; } require(liquidity_ > 0, "SmarDex: INSUFFICIENT_LIQUIDITY_MINTED"); _mint(_to, liquidity_); _update(_balance0after, _balance1after, _fictiveReserve0, _fictiveReserve1, priceAverage0, priceAverage1); emit Mint(msg.sender, _to, _amount0, _amount1); } /** * @notice Burn lp tokens in the balance of the contract. Sends to the defined address the amount of token0 and * token1 proportionally of the amount burned. * @param _to address who will receive tokens * @return amount0_ amount of token0 sent to the address defined in parameter * @return amount1_ amount of token0 sent to the address defined in parameter */ function _burnBeforeFee(address _to) internal lock returns (uint256 amount0_, uint256 amount1_) { _mintFee(); // gas savings address _token0 = token0; address _token1 = token1; uint256 _balance0 = IERC20(_token0).balanceOf(address(this)); uint256 _balance1 = IERC20(_token1).balanceOf(address(this)); uint256 _liquidity = balanceOf(address(this)); uint256 _totalSupply = totalSupply(); // pro-rata distribution amount0_ = (_liquidity * _balance0) / _totalSupply; amount1_ = (_liquidity * _balance1) / _totalSupply; require(amount0_ > 0 && amount1_ > 0, "SmarDex: INSUFFICIENT_LIQUIDITY_BURNED"); // update proportionally the fictiveReserves uint256 _fictiveReserve0 = fictiveReserve0; uint256 _fictiveReserve1 = fictiveReserve1; _fictiveReserve0 -= (_fictiveReserve0 * _liquidity) / _totalSupply; _fictiveReserve1 -= (_fictiveReserve1 * _liquidity) / _totalSupply; _burn(address(this), _liquidity); TransferHelper.safeTransfer(_token0, _to, amount0_); TransferHelper.safeTransfer(_token1, _to, amount1_); _balance0 = IERC20(_token0).balanceOf(address(this)); _balance1 = IERC20(_token1).balanceOf(address(this)); _update(_balance0, _balance1, _fictiveReserve0, _fictiveReserve1, priceAverage0, priceAverage1); emit Burn(msg.sender, _to, amount0_, amount1_); } /** * @notice execute function "executeWork(address,address)" of the feeTo contract. Doesn't revert tx if it reverts */ function _feeToSwap() internal { address _feeTo = ISmardexFactory(factory).feeTo(); // call contract destination for handling fees // We don't handle return values so it does not revert for LP if something went wrong in feeTo _feeTo.call(abi.encodeWithSelector(AUTOSWAP_SELECTOR, token0, token1)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ 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); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/extensions/draft-ERC20Permit.sol) pragma solidity ^0.8.0; import "./draft-IERC20Permit.sol"; import "../ERC20.sol"; import "../../../utils/cryptography/ECDSA.sol"; import "../../../utils/cryptography/EIP712.sol"; import "../../../utils/Counters.sol"; /** * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * _Available since v3.4._ */ abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 { using Counters for Counters.Counter; mapping(address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private constant _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); /** * @dev In previous versions `_PERMIT_TYPEHASH` was declared as `immutable`. * However, to ensure consistency with the upgradeable transpiler, we will continue * to reserve a slot. * @custom:oz-renamed-from _PERMIT_TYPEHASH */ // solhint-disable-next-line var-name-mixedcase bytes32 private _PERMIT_TYPEHASH_DEPRECATED_SLOT; /** * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`. * * It's a good idea to use the same `name` that is defined as the ERC20 token name. */ constructor(string memory name) EIP712(name, "1") {} /** * @dev See {IERC20Permit-permit}. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline)); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); require(signer == owner, "ERC20Permit: invalid signature"); _approve(owner, spender, value); } /** * @dev See {IERC20Permit-nonces}. */ function nonces(address owner) public view virtual override returns (uint256) { return _nonces[owner].current(); } /** * @dev See {IERC20Permit-DOMAIN_SEPARATOR}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view override returns (bytes32) { return _domainSeparatorV4(); } /** * @dev "Consume a nonce": return the current value and increment. * * _Available since v4.1._ */ function _useNonce(address owner) internal virtual returns (uint256 current) { Counters.Counter storage nonce = _nonces[owner]; current = nonce.current(); nonce.increment(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: 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 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Counters.sol) pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV // Deprecated in v4.8 } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. /// @solidity memory-safe-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); uint8 v = uint8((uint256(vs) >> 255) + 27); return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/EIP712.sol) pragma solidity ^0.8.0; import "./ECDSA.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; address private immutable _CACHED_THIS; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = block.chainid; _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _CACHED_THIS = address(this); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SafeCast.sol) // This file was procedurally generated from scripts/generate/templates/SafeCast.js. pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such an operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint248 from uint256, reverting on * overflow (when the input is greater than largest uint248). * * Counterpart to Solidity's `uint248` operator. * * Requirements: * * - input must fit into 248 bits * * _Available since v4.7._ */ function toUint248(uint256 value) internal pure returns (uint248) { require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits"); return uint248(value); } /** * @dev Returns the downcasted uint240 from uint256, reverting on * overflow (when the input is greater than largest uint240). * * Counterpart to Solidity's `uint240` operator. * * Requirements: * * - input must fit into 240 bits * * _Available since v4.7._ */ function toUint240(uint256 value) internal pure returns (uint240) { require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits"); return uint240(value); } /** * @dev Returns the downcasted uint232 from uint256, reverting on * overflow (when the input is greater than largest uint232). * * Counterpart to Solidity's `uint232` operator. * * Requirements: * * - input must fit into 232 bits * * _Available since v4.7._ */ function toUint232(uint256 value) internal pure returns (uint232) { require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits"); return uint232(value); } /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits * * _Available since v4.2._ */ function toUint224(uint256 value) internal pure returns (uint224) { require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(value); } /** * @dev Returns the downcasted uint216 from uint256, reverting on * overflow (when the input is greater than largest uint216). * * Counterpart to Solidity's `uint216` operator. * * Requirements: * * - input must fit into 216 bits * * _Available since v4.7._ */ function toUint216(uint256 value) internal pure returns (uint216) { require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits"); return uint216(value); } /** * @dev Returns the downcasted uint208 from uint256, reverting on * overflow (when the input is greater than largest uint208). * * Counterpart to Solidity's `uint208` operator. * * Requirements: * * - input must fit into 208 bits * * _Available since v4.7._ */ function toUint208(uint256 value) internal pure returns (uint208) { require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits"); return uint208(value); } /** * @dev Returns the downcasted uint200 from uint256, reverting on * overflow (when the input is greater than largest uint200). * * Counterpart to Solidity's `uint200` operator. * * Requirements: * * - input must fit into 200 bits * * _Available since v4.7._ */ function toUint200(uint256 value) internal pure returns (uint200) { require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits"); return uint200(value); } /** * @dev Returns the downcasted uint192 from uint256, reverting on * overflow (when the input is greater than largest uint192). * * Counterpart to Solidity's `uint192` operator. * * Requirements: * * - input must fit into 192 bits * * _Available since v4.7._ */ function toUint192(uint256 value) internal pure returns (uint192) { require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits"); return uint192(value); } /** * @dev Returns the downcasted uint184 from uint256, reverting on * overflow (when the input is greater than largest uint184). * * Counterpart to Solidity's `uint184` operator. * * Requirements: * * - input must fit into 184 bits * * _Available since v4.7._ */ function toUint184(uint256 value) internal pure returns (uint184) { require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits"); return uint184(value); } /** * @dev Returns the downcasted uint176 from uint256, reverting on * overflow (when the input is greater than largest uint176). * * Counterpart to Solidity's `uint176` operator. * * Requirements: * * - input must fit into 176 bits * * _Available since v4.7._ */ function toUint176(uint256 value) internal pure returns (uint176) { require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits"); return uint176(value); } /** * @dev Returns the downcasted uint168 from uint256, reverting on * overflow (when the input is greater than largest uint168). * * Counterpart to Solidity's `uint168` operator. * * Requirements: * * - input must fit into 168 bits * * _Available since v4.7._ */ function toUint168(uint256 value) internal pure returns (uint168) { require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits"); return uint168(value); } /** * @dev Returns the downcasted uint160 from uint256, reverting on * overflow (when the input is greater than largest uint160). * * Counterpart to Solidity's `uint160` operator. * * Requirements: * * - input must fit into 160 bits * * _Available since v4.7._ */ function toUint160(uint256 value) internal pure returns (uint160) { require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits"); return uint160(value); } /** * @dev Returns the downcasted uint152 from uint256, reverting on * overflow (when the input is greater than largest uint152). * * Counterpart to Solidity's `uint152` operator. * * Requirements: * * - input must fit into 152 bits * * _Available since v4.7._ */ function toUint152(uint256 value) internal pure returns (uint152) { require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits"); return uint152(value); } /** * @dev Returns the downcasted uint144 from uint256, reverting on * overflow (when the input is greater than largest uint144). * * Counterpart to Solidity's `uint144` operator. * * Requirements: * * - input must fit into 144 bits * * _Available since v4.7._ */ function toUint144(uint256 value) internal pure returns (uint144) { require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits"); return uint144(value); } /** * @dev Returns the downcasted uint136 from uint256, reverting on * overflow (when the input is greater than largest uint136). * * Counterpart to Solidity's `uint136` operator. * * Requirements: * * - input must fit into 136 bits * * _Available since v4.7._ */ function toUint136(uint256 value) internal pure returns (uint136) { require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits"); return uint136(value); } /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v2.5._ */ function toUint128(uint256 value) internal pure returns (uint128) { require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint120 from uint256, reverting on * overflow (when the input is greater than largest uint120). * * Counterpart to Solidity's `uint120` operator. * * Requirements: * * - input must fit into 120 bits * * _Available since v4.7._ */ function toUint120(uint256 value) internal pure returns (uint120) { require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits"); return uint120(value); } /** * @dev Returns the downcasted uint112 from uint256, reverting on * overflow (when the input is greater than largest uint112). * * Counterpart to Solidity's `uint112` operator. * * Requirements: * * - input must fit into 112 bits * * _Available since v4.7._ */ function toUint112(uint256 value) internal pure returns (uint112) { require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits"); return uint112(value); } /** * @dev Returns the downcasted uint104 from uint256, reverting on * overflow (when the input is greater than largest uint104). * * Counterpart to Solidity's `uint104` operator. * * Requirements: * * - input must fit into 104 bits * * _Available since v4.7._ */ function toUint104(uint256 value) internal pure returns (uint104) { require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits"); return uint104(value); } /** * @dev Returns the downcasted uint96 from uint256, reverting on * overflow (when the input is greater than largest uint96). * * Counterpart to Solidity's `uint96` operator. * * Requirements: * * - input must fit into 96 bits * * _Available since v4.2._ */ function toUint96(uint256 value) internal pure returns (uint96) { require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); return uint96(value); } /** * @dev Returns the downcasted uint88 from uint256, reverting on * overflow (when the input is greater than largest uint88). * * Counterpart to Solidity's `uint88` operator. * * Requirements: * * - input must fit into 88 bits * * _Available since v4.7._ */ function toUint88(uint256 value) internal pure returns (uint88) { require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits"); return uint88(value); } /** * @dev Returns the downcasted uint80 from uint256, reverting on * overflow (when the input is greater than largest uint80). * * Counterpart to Solidity's `uint80` operator. * * Requirements: * * - input must fit into 80 bits * * _Available since v4.7._ */ function toUint80(uint256 value) internal pure returns (uint80) { require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits"); return uint80(value); } /** * @dev Returns the downcasted uint72 from uint256, reverting on * overflow (when the input is greater than largest uint72). * * Counterpart to Solidity's `uint72` operator. * * Requirements: * * - input must fit into 72 bits * * _Available since v4.7._ */ function toUint72(uint256 value) internal pure returns (uint72) { require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits"); return uint72(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v2.5._ */ function toUint64(uint256 value) internal pure returns (uint64) { require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint56 from uint256, reverting on * overflow (when the input is greater than largest uint56). * * Counterpart to Solidity's `uint56` operator. * * Requirements: * * - input must fit into 56 bits * * _Available since v4.7._ */ function toUint56(uint256 value) internal pure returns (uint56) { require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits"); return uint56(value); } /** * @dev Returns the downcasted uint48 from uint256, reverting on * overflow (when the input is greater than largest uint48). * * Counterpart to Solidity's `uint48` operator. * * Requirements: * * - input must fit into 48 bits * * _Available since v4.7._ */ function toUint48(uint256 value) internal pure returns (uint48) { require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits"); return uint48(value); } /** * @dev Returns the downcasted uint40 from uint256, reverting on * overflow (when the input is greater than largest uint40). * * Counterpart to Solidity's `uint40` operator. * * Requirements: * * - input must fit into 40 bits * * _Available since v4.7._ */ function toUint40(uint256 value) internal pure returns (uint40) { require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits"); return uint40(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v2.5._ */ function toUint32(uint256 value) internal pure returns (uint32) { require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint24 from uint256, reverting on * overflow (when the input is greater than largest uint24). * * Counterpart to Solidity's `uint24` operator. * * Requirements: * * - input must fit into 24 bits * * _Available since v4.7._ */ function toUint24(uint256 value) internal pure returns (uint24) { require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits"); return uint24(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v2.5._ */ function toUint16(uint256 value) internal pure returns (uint16) { require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits * * _Available since v2.5._ */ function toUint8(uint256 value) internal pure returns (uint8) { require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. * * _Available since v3.0._ */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int248 from int256, reverting on * overflow (when the input is less than smallest int248 or * greater than largest int248). * * Counterpart to Solidity's `int248` operator. * * Requirements: * * - input must fit into 248 bits * * _Available since v4.7._ */ function toInt248(int256 value) internal pure returns (int248 downcasted) { downcasted = int248(value); require(downcasted == value, "SafeCast: value doesn't fit in 248 bits"); } /** * @dev Returns the downcasted int240 from int256, reverting on * overflow (when the input is less than smallest int240 or * greater than largest int240). * * Counterpart to Solidity's `int240` operator. * * Requirements: * * - input must fit into 240 bits * * _Available since v4.7._ */ function toInt240(int256 value) internal pure returns (int240 downcasted) { downcasted = int240(value); require(downcasted == value, "SafeCast: value doesn't fit in 240 bits"); } /** * @dev Returns the downcasted int232 from int256, reverting on * overflow (when the input is less than smallest int232 or * greater than largest int232). * * Counterpart to Solidity's `int232` operator. * * Requirements: * * - input must fit into 232 bits * * _Available since v4.7._ */ function toInt232(int256 value) internal pure returns (int232 downcasted) { downcasted = int232(value); require(downcasted == value, "SafeCast: value doesn't fit in 232 bits"); } /** * @dev Returns the downcasted int224 from int256, reverting on * overflow (when the input is less than smallest int224 or * greater than largest int224). * * Counterpart to Solidity's `int224` operator. * * Requirements: * * - input must fit into 224 bits * * _Available since v4.7._ */ function toInt224(int256 value) internal pure returns (int224 downcasted) { downcasted = int224(value); require(downcasted == value, "SafeCast: value doesn't fit in 224 bits"); } /** * @dev Returns the downcasted int216 from int256, reverting on * overflow (when the input is less than smallest int216 or * greater than largest int216). * * Counterpart to Solidity's `int216` operator. * * Requirements: * * - input must fit into 216 bits * * _Available since v4.7._ */ function toInt216(int256 value) internal pure returns (int216 downcasted) { downcasted = int216(value); require(downcasted == value, "SafeCast: value doesn't fit in 216 bits"); } /** * @dev Returns the downcasted int208 from int256, reverting on * overflow (when the input is less than smallest int208 or * greater than largest int208). * * Counterpart to Solidity's `int208` operator. * * Requirements: * * - input must fit into 208 bits * * _Available since v4.7._ */ function toInt208(int256 value) internal pure returns (int208 downcasted) { downcasted = int208(value); require(downcasted == value, "SafeCast: value doesn't fit in 208 bits"); } /** * @dev Returns the downcasted int200 from int256, reverting on * overflow (when the input is less than smallest int200 or * greater than largest int200). * * Counterpart to Solidity's `int200` operator. * * Requirements: * * - input must fit into 200 bits * * _Available since v4.7._ */ function toInt200(int256 value) internal pure returns (int200 downcasted) { downcasted = int200(value); require(downcasted == value, "SafeCast: value doesn't fit in 200 bits"); } /** * @dev Returns the downcasted int192 from int256, reverting on * overflow (when the input is less than smallest int192 or * greater than largest int192). * * Counterpart to Solidity's `int192` operator. * * Requirements: * * - input must fit into 192 bits * * _Available since v4.7._ */ function toInt192(int256 value) internal pure returns (int192 downcasted) { downcasted = int192(value); require(downcasted == value, "SafeCast: value doesn't fit in 192 bits"); } /** * @dev Returns the downcasted int184 from int256, reverting on * overflow (when the input is less than smallest int184 or * greater than largest int184). * * Counterpart to Solidity's `int184` operator. * * Requirements: * * - input must fit into 184 bits * * _Available since v4.7._ */ function toInt184(int256 value) internal pure returns (int184 downcasted) { downcasted = int184(value); require(downcasted == value, "SafeCast: value doesn't fit in 184 bits"); } /** * @dev Returns the downcasted int176 from int256, reverting on * overflow (when the input is less than smallest int176 or * greater than largest int176). * * Counterpart to Solidity's `int176` operator. * * Requirements: * * - input must fit into 176 bits * * _Available since v4.7._ */ function toInt176(int256 value) internal pure returns (int176 downcasted) { downcasted = int176(value); require(downcasted == value, "SafeCast: value doesn't fit in 176 bits"); } /** * @dev Returns the downcasted int168 from int256, reverting on * overflow (when the input is less than smallest int168 or * greater than largest int168). * * Counterpart to Solidity's `int168` operator. * * Requirements: * * - input must fit into 168 bits * * _Available since v4.7._ */ function toInt168(int256 value) internal pure returns (int168 downcasted) { downcasted = int168(value); require(downcasted == value, "SafeCast: value doesn't fit in 168 bits"); } /** * @dev Returns the downcasted int160 from int256, reverting on * overflow (when the input is less than smallest int160 or * greater than largest int160). * * Counterpart to Solidity's `int160` operator. * * Requirements: * * - input must fit into 160 bits * * _Available since v4.7._ */ function toInt160(int256 value) internal pure returns (int160 downcasted) { downcasted = int160(value); require(downcasted == value, "SafeCast: value doesn't fit in 160 bits"); } /** * @dev Returns the downcasted int152 from int256, reverting on * overflow (when the input is less than smallest int152 or * greater than largest int152). * * Counterpart to Solidity's `int152` operator. * * Requirements: * * - input must fit into 152 bits * * _Available since v4.7._ */ function toInt152(int256 value) internal pure returns (int152 downcasted) { downcasted = int152(value); require(downcasted == value, "SafeCast: value doesn't fit in 152 bits"); } /** * @dev Returns the downcasted int144 from int256, reverting on * overflow (when the input is less than smallest int144 or * greater than largest int144). * * Counterpart to Solidity's `int144` operator. * * Requirements: * * - input must fit into 144 bits * * _Available since v4.7._ */ function toInt144(int256 value) internal pure returns (int144 downcasted) { downcasted = int144(value); require(downcasted == value, "SafeCast: value doesn't fit in 144 bits"); } /** * @dev Returns the downcasted int136 from int256, reverting on * overflow (when the input is less than smallest int136 or * greater than largest int136). * * Counterpart to Solidity's `int136` operator. * * Requirements: * * - input must fit into 136 bits * * _Available since v4.7._ */ function toInt136(int256 value) internal pure returns (int136 downcasted) { downcasted = int136(value); require(downcasted == value, "SafeCast: value doesn't fit in 136 bits"); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128 downcasted) { downcasted = int128(value); require(downcasted == value, "SafeCast: value doesn't fit in 128 bits"); } /** * @dev Returns the downcasted int120 from int256, reverting on * overflow (when the input is less than smallest int120 or * greater than largest int120). * * Counterpart to Solidity's `int120` operator. * * Requirements: * * - input must fit into 120 bits * * _Available since v4.7._ */ function toInt120(int256 value) internal pure returns (int120 downcasted) { downcasted = int120(value); require(downcasted == value, "SafeCast: value doesn't fit in 120 bits"); } /** * @dev Returns the downcasted int112 from int256, reverting on * overflow (when the input is less than smallest int112 or * greater than largest int112). * * Counterpart to Solidity's `int112` operator. * * Requirements: * * - input must fit into 112 bits * * _Available since v4.7._ */ function toInt112(int256 value) internal pure returns (int112 downcasted) { downcasted = int112(value); require(downcasted == value, "SafeCast: value doesn't fit in 112 bits"); } /** * @dev Returns the downcasted int104 from int256, reverting on * overflow (when the input is less than smallest int104 or * greater than largest int104). * * Counterpart to Solidity's `int104` operator. * * Requirements: * * - input must fit into 104 bits * * _Available since v4.7._ */ function toInt104(int256 value) internal pure returns (int104 downcasted) { downcasted = int104(value); require(downcasted == value, "SafeCast: value doesn't fit in 104 bits"); } /** * @dev Returns the downcasted int96 from int256, reverting on * overflow (when the input is less than smallest int96 or * greater than largest int96). * * Counterpart to Solidity's `int96` operator. * * Requirements: * * - input must fit into 96 bits * * _Available since v4.7._ */ function toInt96(int256 value) internal pure returns (int96 downcasted) { downcasted = int96(value); require(downcasted == value, "SafeCast: value doesn't fit in 96 bits"); } /** * @dev Returns the downcasted int88 from int256, reverting on * overflow (when the input is less than smallest int88 or * greater than largest int88). * * Counterpart to Solidity's `int88` operator. * * Requirements: * * - input must fit into 88 bits * * _Available since v4.7._ */ function toInt88(int256 value) internal pure returns (int88 downcasted) { downcasted = int88(value); require(downcasted == value, "SafeCast: value doesn't fit in 88 bits"); } /** * @dev Returns the downcasted int80 from int256, reverting on * overflow (when the input is less than smallest int80 or * greater than largest int80). * * Counterpart to Solidity's `int80` operator. * * Requirements: * * - input must fit into 80 bits * * _Available since v4.7._ */ function toInt80(int256 value) internal pure returns (int80 downcasted) { downcasted = int80(value); require(downcasted == value, "SafeCast: value doesn't fit in 80 bits"); } /** * @dev Returns the downcasted int72 from int256, reverting on * overflow (when the input is less than smallest int72 or * greater than largest int72). * * Counterpart to Solidity's `int72` operator. * * Requirements: * * - input must fit into 72 bits * * _Available since v4.7._ */ function toInt72(int256 value) internal pure returns (int72 downcasted) { downcasted = int72(value); require(downcasted == value, "SafeCast: value doesn't fit in 72 bits"); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64 downcasted) { downcasted = int64(value); require(downcasted == value, "SafeCast: value doesn't fit in 64 bits"); } /** * @dev Returns the downcasted int56 from int256, reverting on * overflow (when the input is less than smallest int56 or * greater than largest int56). * * Counterpart to Solidity's `int56` operator. * * Requirements: * * - input must fit into 56 bits * * _Available since v4.7._ */ function toInt56(int256 value) internal pure returns (int56 downcasted) { downcasted = int56(value); require(downcasted == value, "SafeCast: value doesn't fit in 56 bits"); } /** * @dev Returns the downcasted int48 from int256, reverting on * overflow (when the input is less than smallest int48 or * greater than largest int48). * * Counterpart to Solidity's `int48` operator. * * Requirements: * * - input must fit into 48 bits * * _Available since v4.7._ */ function toInt48(int256 value) internal pure returns (int48 downcasted) { downcasted = int48(value); require(downcasted == value, "SafeCast: value doesn't fit in 48 bits"); } /** * @dev Returns the downcasted int40 from int256, reverting on * overflow (when the input is less than smallest int40 or * greater than largest int40). * * Counterpart to Solidity's `int40` operator. * * Requirements: * * - input must fit into 40 bits * * _Available since v4.7._ */ function toInt40(int256 value) internal pure returns (int40 downcasted) { downcasted = int40(value); require(downcasted == value, "SafeCast: value doesn't fit in 40 bits"); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32 downcasted) { downcasted = int32(value); require(downcasted == value, "SafeCast: value doesn't fit in 32 bits"); } /** * @dev Returns the downcasted int24 from int256, reverting on * overflow (when the input is less than smallest int24 or * greater than largest int24). * * Counterpart to Solidity's `int24` operator. * * Requirements: * * - input must fit into 24 bits * * _Available since v4.7._ */ function toInt24(int256 value) internal pure returns (int24 downcasted) { downcasted = int24(value); require(downcasted == value, "SafeCast: value doesn't fit in 24 bits"); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16 downcasted) { downcasted = int16(value); require(downcasted == value, "SafeCast: value doesn't fit in 16 bits"); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8 downcasted) { downcasted = int8(value); require(downcasted == value, "SafeCast: value doesn't fit in 8 bits"); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. * * _Available since v3.0._ */ function toInt256(uint256 value) internal pure returns (int256) { // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol) pragma solidity ^0.8.0; import "./math/Math.sol"; /** * @dev String operations. */ library Strings { bytes16 private constant _SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { unchecked { uint256 length = Math.log10(value) + 1; string memory buffer = new string(length); uint256 ptr; /// @solidity memory-safe-assembly assembly { ptr := add(buffer, add(32, length)) } while (true) { ptr--; /// @solidity memory-safe-assembly assembly { mstore8(ptr, byte(mod(value, 10), _SYMBOLS)) } value /= 10; if (value == 0) break; } return buffer; } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { unchecked { return toHexString(value, Math.log256(value) + 1); } } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.8.17; interface ISmardexFactory { /** * @notice emitted at each SmardexPair created * @param token0 address of the token0 * @param token1 address of the token1 * @param pair address of the SmardexPair created * @param totalPair number of SmardexPair created so far */ event PairCreated(address indexed token0, address indexed token1, address pair, uint256 totalPair); /** * @notice return which address fees will be transferred */ function feeTo() external view returns (address); /** * @notice return which address can update feeTo */ function feeToSetter() external view returns (address); /** * @notice return the address of the pair of 2 tokens */ function getPair(address _tokenA, address _tokenB) external view returns (address pair_); /** * @notice return the address of the pair at index * @param _index index of the pair * @return pair_ address of the pair */ function allPairs(uint256 _index) external view returns (address pair_); /** * @notice return the quantity of pairs * @return quantity in uint256 */ function allPairsLength() external view returns (uint256); /** * @notice create pair with 2 address * @param _tokenA address of tokenA * @param _tokenB address of tokenB * @return pair_ address of the pair created */ function createPair(address _tokenA, address _tokenB) external returns (address pair_); /** * @notice set the address who will receive fees, can only be call by feeToSetter * @param _feeTo address to replace */ function setFeeTo(address _feeTo) external; /** * @notice set the address who can update feeTo, can only be call by feeToSetter * @param _feeToSetter address to replace */ function setFeeToSetter(address _feeToSetter) external; }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.8.17; interface ISmardexMintCallback { /** * @notice callback data for mint * @param token0 address of the first token of the pair * @param token1 address of the second token of the pair * @param amount0 amount of token0 to provide * @param amount1 amount of token1 to provide * @param payer address of the payer to provide token for the mint */ struct MintCallbackData { address token0; address token1; uint256 amount0; uint256 amount1; address payer; } /** * @notice callback to implement when calling SmardexPair.mint * @param _data callback data for mint */ function smardexMintCallback(MintCallbackData calldata _data) external; }
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity >=0.8.17; // interfaces import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol"; interface ISmardexPair is IERC20, IERC20Permit { /** * @notice emitted at each mint * @param sender address calling the mint function (usualy the Router contract) * @param to address that receives the LP-tokens * @param amount0 amount of token0 to be added in liquidity * @param amount1 amount of token1 to be added in liquidity * @dev the amount of LP-token sent can be caught using the transfer event of the pair */ event Mint(address indexed sender, address indexed to, uint256 amount0, uint256 amount1); /** * @notice emitted at each burn * @param sender address calling the burn function (usualy the Router contract) * @param to address that receives the tokens * @param amount0 amount of token0 to be withdrawn * @param amount1 amount of token1 to be withdrawn * @dev the amount of LP-token sent can be caught using the transfer event of the pair */ event Burn(address indexed sender, address indexed to, uint256 amount0, uint256 amount1); /** * @notice emitted at each swap * @param sender address calling the swap function (usualy the Router contract) * @param to address that receives the out-tokens * @param amount0 amount of token0 to be swapped * @param amount1 amount of token1 to be swapped * @dev one of the 2 amount is always negative, the other one is always positive. The positive one is the one that * the user send to the contract, the negative one is the one that the contract send to the user. */ event Swap(address indexed sender, address indexed to, int256 amount0, int256 amount1); /** * @notice emitted each time the fictive reserves are changed (mint, burn, swap) * @param reserve0 the new reserve of token0 * @param reserve1 the new reserve of token1 * @param fictiveReserve0 the new fictive reserve of token0 * @param fictiveReserve1 the new fictive reserve of token1 * @param priceAverage0 the new priceAverage of token0 * @param priceAverage1 the new priceAverage of token1 */ event Sync( uint256 reserve0, uint256 reserve1, uint256 fictiveReserve0, uint256 fictiveReserve1, uint256 priceAverage0, uint256 priceAverage1 ); /** * @notice get the factory address * @return address of the factory */ function factory() external view returns (address); /** * @notice get the token0 address * @return address of the token0 */ function token0() external view returns (address); /** * @notice get the token1 address * @return address of the token1 */ function token1() external view returns (address); /** * @notice called once by the factory at time of deployment * @param _token0 address of token0 * @param _token1 address of token1 */ function initialize(address _token0, address _token1) external; /** * @notice return current Reserves of both token in the pair, * corresponding to token balance - pending fees * @return reserve0_ current reserve of token0 - pending fee0 * @return reserve1_ current reserve of token1 - pending fee1 */ function getReserves() external view returns (uint256 reserve0_, uint256 reserve1_); /** * @notice return current Fictives Reserves of both token in the pair * @return fictiveReserve0_ current fictive reserve of token0 * @return fictiveReserve1_ current fictive reserve of token1 */ function getFictiveReserves() external view returns (uint256 fictiveReserve0_, uint256 fictiveReserve1_); /** * @notice return current pending fees of both token in the pair * @return fees0_ current pending fees of token0 * @return fees1_ current pending fees of token1 */ function getFees() external view returns (uint256 fees0_, uint256 fees1_); /** * @notice return last updated price average at timestamp of both token in the pair, * read price0Average/price1Average for current price of token0/token1 * @return priceAverage0_ current price for token0 * @return priceAverage1_ current price for token1 * @return blockTimestampLast_ last block timestamp when price was updated */ function getPriceAverage() external view returns (uint256 priceAverage0_, uint256 priceAverage1_, uint256 blockTimestampLast_); /** * @notice return current price average of both token in the pair for provided currentTimeStamp * read price0Average/price1Average for current price of token0/token1 * @param _fictiveReserveIn, * @param _fictiveReserveOut, * @param _priceAverageLastTimestamp, * @param _priceAverageIn current price for token0 * @param _priceAverageOut current price for token1 * @param _currentTimestamp block timestamp to get price * @return priceAverageIn_ current price for token0 * @return priceAverageOut_ current price for token1 */ function getUpdatedPriceAverage( uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageLastTimestamp, uint256 _priceAverageIn, uint256 _priceAverageOut, uint256 _currentTimestamp ) external pure returns (uint256 priceAverageIn_, uint256 priceAverageOut_); /** * @notice Mint lp tokens proportionally of added tokens in balance. Should be called from a contract * that makes safety checks like the SmardexRouter * @param _to address who will receive minted tokens * @param _amount0 amount of token0 to provide * @param _amount1 amount of token1 to provide * @return liquidity_ amount of lp tokens minted and sent to the address defined in parameter */ function mint( address _to, uint256 _amount0, uint256 _amount1, address _payer ) external returns (uint256 liquidity_); /** * @notice Burn lp tokens in the balance of the contract. Sends to the defined address the amount of token0 and * token1 proportionally of the amount burned. Should be called from a contract that makes safety checks like the * SmardexRouter * @param _to address who will receive tokens * @return amount0_ amount of token0 sent to the address defined in parameter * @return amount1_ amount of token0 sent to the address defined in parameter */ function burn(address _to) external returns (uint256 amount0_, uint256 amount1_); /** * @notice Swaps tokens. Sends to the defined address the amount of token0 and token1 defined in parameters. * Tokens to trade should be already sent in the contract. * Swap function will check if the resulted balance is correct with current reserves and reserves fictive. * Should be called from a contract that makes safety checks like the SmardexRouter * @param _to address who will receive tokens * @param _zeroForOne token0 to token1 * @param _amountSpecified amount of token wanted * @param _data used for flash swap, data.length must be 0 for regular swap */ function swap( address _to, bool _zeroForOne, int256 _amountSpecified, bytes calldata _data ) external returns (int256 amount0_, int256 amount1_); }
// SPDX-License-Identifier: GPL-2.0-or-later pragma solidity >=0.8.17; interface ISmardexSwapCallback { /** * @notice callback data for swap * @param _amount0Delta amount of token0 for the swap (negative is incoming, positive is required to pay to pair) * @param _amount1Delta amount of token1 for the swap (negative is incoming, positive is required to pay to pair) * @param _data for Router path and payer for the swap (see router for details) */ function smardexSwapCallback(int256 _amount0Delta, int256 _amount1Delta, bytes calldata _data) external; }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity =0.8.17; // libraries import "@openzeppelin/contracts/utils/math/Math.sol"; // interfaces import "../interfaces/ISmardexPair.sol"; library SmardexLibrary { /// @notice amount of fees sent to LP, not in percent but in FEES_BASE uint256 public constant FEES_LP = 5; /// @notice amount of fees sent to the pool, not in percent but in FEES_BASE. if feeTo is null, sent to the LP uint256 public constant FEES_POOL = 2; /// @notice total amount of fees, not in percent but in FEES_BASE uint256 public constant FEES_TOTAL = FEES_LP + FEES_POOL; /// @notice base of the FEES uint256 public constant FEES_BASE = 10000; /// @notice ratio of quantity that is send to the user, after removing the fees, not in percent but in FEES_BASE uint256 public constant REVERSE_FEES_TOTAL = FEES_BASE - FEES_TOTAL; /// @notice precision for approxEq, not in percent but in APPROX_PRECISION_BASE uint256 public constant APPROX_PRECISION = 1; /// @notice base of the APPROX_PRECISION uint256 public constant APPROX_PRECISION_BASE = 1_000_000; /// @notice number of seconds to reset priceAverage uint256 private constant MAX_BLOCK_DIFF_SECONDS = 300; /** * @notice check if 2 numbers are approximatively equal, using APPROX_PRECISION * @param _x number to compare * @param _y number to compare * @return true if numbers are approximatively equal, false otherwise */ function approxEq(uint256 _x, uint256 _y) internal pure returns (bool) { if (_x > _y) { return _x < (_y + (_y * APPROX_PRECISION) / APPROX_PRECISION_BASE); } else { return _y < (_x + (_x * APPROX_PRECISION) / APPROX_PRECISION_BASE); } } /** * @notice check if 2 ratio are approximatively equal: _xNum _/ xDen ~= _yNum / _yDen * @param _xNum numerator of the first ratio to compare * @param _xDen denominator of the first ratio to compare * @param _yNum numerator of the second ratio to compare * @param _yDen denominator of the second ratio to compare * @return true if ratio are approximatively equal, false otherwise */ function ratioApproxEq(uint256 _xNum, uint256 _xDen, uint256 _yNum, uint256 _yDen) internal pure returns (bool) { return approxEq(_xNum * _yDen, _xDen * _yNum); } /** * @notice update priceAverage given old timestamp, new timestamp and prices * @param _fictiveReserveIn ratio component of the new price of the in-token * @param _fictiveReserveOut ratio component of the new price of the out-token * @param _priceAverageLastTimestamp timestamp of the last priceAvregae update (0, if never updated) * @param _priceAverageIn ratio component of the last priceAverage of the in-token * @param _priceAverageOut ratio component of the last priceAverage of the out-token * @param _currentTimestamp timestamp of the priceAverage to update * @return newPriceAverageIn_ ratio component of the updated priceAverage of the in-token * @return newPriceAverageOut_ ratio component of the updated priceAverage of the out-token */ function getUpdatedPriceAverage( uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageLastTimestamp, uint256 _priceAverageIn, uint256 _priceAverageOut, uint256 _currentTimestamp ) internal pure returns (uint256 newPriceAverageIn_, uint256 newPriceAverageOut_) { require(_currentTimestamp >= _priceAverageLastTimestamp, "SmardexPair: INVALID_TIMESTAMP"); // very first time if (_priceAverageLastTimestamp == 0) { newPriceAverageIn_ = _fictiveReserveIn; newPriceAverageOut_ = _fictiveReserveOut; } // another tx has been done in the same block else if (_priceAverageLastTimestamp == _currentTimestamp) { newPriceAverageIn_ = _priceAverageIn; newPriceAverageOut_ = _priceAverageOut; } // need to compute new linear-average price else { // compute new price: uint256 _timeDiff = Math.min(_currentTimestamp - _priceAverageLastTimestamp, MAX_BLOCK_DIFF_SECONDS); newPriceAverageIn_ = _fictiveReserveIn; newPriceAverageOut_ = (((MAX_BLOCK_DIFF_SECONDS - _timeDiff) * _priceAverageOut * newPriceAverageIn_) / _priceAverageIn + _timeDiff * _fictiveReserveOut) / MAX_BLOCK_DIFF_SECONDS; } } /** * @notice compute the firstTradeAmountIn so that the price reach the price Average * @param _amountIn the amountIn requested, it's the maximum possible value for firstAmountIn_ * @param _fictiveReserveIn fictive reserve of the in-token * @param _fictiveReserveOut fictive reserve of the out-token * @param _priceAverageIn ratio component of the priceAverage of the in-token * @param _priceAverageOut ratio component of the priceAverage of the out-token * @return firstAmountIn_ the first amount of in-token * * @dev if the trade is going in the direction that the price will never reach the priceAverage, or if _amountIn * is not big enough to reach the priceAverage or if the price is already equal to the priceAverage, then * firstAmountIn_ will be set to _amountIn */ function computeFirstTradeQtyIn( uint256 _amountIn, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageIn, uint256 _priceAverageOut ) internal pure returns (uint256 firstAmountIn_) { // default value firstAmountIn_ = _amountIn; // if trade is in the good direction if (_fictiveReserveOut * _priceAverageIn > _fictiveReserveIn * _priceAverageOut) { // pre-compute all operands uint256 _toSub = _fictiveReserveIn * (FEES_BASE + REVERSE_FEES_TOTAL - FEES_POOL); uint256 _toDiv = (REVERSE_FEES_TOTAL + FEES_LP) << 1; uint256 _inSqrt = (((_fictiveReserveIn * _fictiveReserveOut) << 2) / _priceAverageOut) * _priceAverageIn * (REVERSE_FEES_TOTAL * (FEES_BASE - FEES_POOL)) + (_fictiveReserveIn * _fictiveReserveIn * (FEES_LP * FEES_LP)); // reverse sqrt check to only compute sqrt if really needed if (_inSqrt < (_toSub + _amountIn * _toDiv) ** 2) { firstAmountIn_ = (Math.sqrt(_inSqrt) - _toSub) / _toDiv; } } } /** * @notice compute the firstTradeAmountOut so that the price reach the price Average * @param _amountOut the amountOut requested, it's the maximum possible value for firstAmountOut_ * @param _fictiveReserveIn fictive reserve of the in-token * @param _fictiveReserveOut fictive reserve of the out-token * @param _priceAverageIn ratio component of the priceAverage of the in-token * @param _priceAverageOut ratio component of the priceAverage of the out-token * @return firstAmountOut_ the first amount of out-token * * @dev if the trade is going in the direction that the price will never reach the priceAverage, or if _amountOut * is not big enough to reach the priceAverage or if the price is already equal to the priceAverage, then * firstAmountOut_ will be set to _amountOut */ function computeFirstTradeQtyOut( uint256 _amountOut, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageIn, uint256 _priceAverageOut ) internal pure returns (uint256 firstAmountOut_) { // default value firstAmountOut_ = _amountOut; // if trade is in the good direction if (_fictiveReserveOut * _priceAverageIn > _fictiveReserveIn * _priceAverageOut) { // pre-compute all operands uint256 _fictiveReserveOutPredFees = (_fictiveReserveIn * FEES_LP * _priceAverageOut) / _priceAverageIn; uint256 _toAdd = ((_fictiveReserveOut * REVERSE_FEES_TOTAL) << 1) + _fictiveReserveOutPredFees; uint256 _toDiv = REVERSE_FEES_TOTAL << 1; uint256 _inSqrt = (((_fictiveReserveOut * _fictiveReserveOutPredFees) << 2) * (REVERSE_FEES_TOTAL * (FEES_BASE - FEES_POOL))) / FEES_LP + _fictiveReserveOutPredFees * _fictiveReserveOutPredFees; // reverse sqrt check to only compute sqrt if really needed if (_inSqrt > (_toAdd - _amountOut * _toDiv) ** 2) { firstAmountOut_ = (_toAdd - Math.sqrt(_inSqrt)) / _toDiv; } } } /** * @notice compute fictive reserves * @param _reserveIn reserve of the in-token * @param _reserveOut reserve of the out-token * @param _fictiveReserveIn fictive reserve of the in-token * @param _fictiveReserveOut fictive reserve of the out-token * @return newFictiveReserveIn_ new fictive reserve of the in-token * @return newFictiveReserveOut_ new fictive reserve of the out-token */ function computeFictiveReserves( uint256 _reserveIn, uint256 _reserveOut, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut ) internal pure returns (uint256 newFictiveReserveIn_, uint256 newFictiveReserveOut_) { if (_reserveOut * _fictiveReserveIn < _reserveIn * _fictiveReserveOut) { uint256 _temp = (((_reserveOut * _reserveOut) / _fictiveReserveOut) * _fictiveReserveIn) / _reserveIn; newFictiveReserveIn_ = (_temp * _fictiveReserveIn) / _fictiveReserveOut + (_reserveOut * _fictiveReserveIn) / _fictiveReserveOut; newFictiveReserveOut_ = _reserveOut + _temp; } else { newFictiveReserveIn_ = (_fictiveReserveIn * _reserveOut) / _fictiveReserveOut + _reserveIn; newFictiveReserveOut_ = (_reserveIn * _fictiveReserveOut) / _fictiveReserveIn + _reserveOut; } // div all values by 4 newFictiveReserveIn_ >>= 2; newFictiveReserveOut_ >>= 2; } /** * @notice apply k const rule using fictive reserve, when the amountIn is specified * @param _amountIn qty of token that arrives in the contract * @param _reserveIn reserve of the in-token * @param _reserveOut reserve of the out-token * @param _fictiveReserveIn fictive reserve of the in-token * @param _fictiveReserveOut fictive reserve of the out-token * @return amountOut_ qty of token that leaves in the contract * @return newReserveIn_ new reserve of the in-token after the transaction * @return newReserveOut_ new reserve of the out-token after the transaction * @return newFictiveReserveIn_ new fictive reserve of the in-token after the transaction * @return newFictiveReserveOut_ new fictive reserve of the out-token after the transaction */ function applyKConstRuleOut( uint256 _amountIn, uint256 _reserveIn, uint256 _reserveOut, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut ) internal pure returns ( uint256 amountOut_, uint256 newReserveIn_, uint256 newReserveOut_, uint256 newFictiveReserveIn_, uint256 newFictiveReserveOut_ ) { // k const rule uint256 _amountInWithFee = _amountIn * REVERSE_FEES_TOTAL; uint256 _numerator = _amountInWithFee * _fictiveReserveOut; uint256 _denominator = _fictiveReserveIn * FEES_BASE + _amountInWithFee; amountOut_ = _numerator / _denominator; // update new reserves and add lp-fees to pools uint256 _amountInWithFeeLp = (_amountInWithFee + (_amountIn * FEES_LP)) / FEES_BASE; newReserveIn_ = _reserveIn + _amountInWithFeeLp; newFictiveReserveIn_ = _fictiveReserveIn + _amountInWithFeeLp; newReserveOut_ = _reserveOut - amountOut_; newFictiveReserveOut_ = _fictiveReserveOut - amountOut_; } /** * @notice apply k const rule using fictive reserve, when the amountOut is specified * @param _amountOut qty of token that leaves in the contract * @param _reserveIn reserve of the in-token * @param _reserveOut reserve of the out-token * @param _fictiveReserveIn fictive reserve of the in-token * @param _fictiveReserveOut fictive reserve of the out-token * @return amountIn_ qty of token that arrives in the contract * @return newReserveIn_ new reserve of the in-token after the transaction * @return newReserveOut_ new reserve of the out-token after the transaction * @return newFictiveReserveIn_ new fictive reserve of the in-token after the transaction * @return newFictiveReserveOut_ new fictive reserve of the out-token after the transaction */ function applyKConstRuleIn( uint256 _amountOut, uint256 _reserveIn, uint256 _reserveOut, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut ) internal pure returns ( uint256 amountIn_, uint256 newReserveIn_, uint256 newReserveOut_, uint256 newFictiveReserveIn_, uint256 newFictiveReserveOut_ ) { // k const rule uint256 _numerator = _fictiveReserveIn * _amountOut * FEES_BASE; uint256 _denominator = (_fictiveReserveOut - _amountOut) * REVERSE_FEES_TOTAL; amountIn_ = _numerator / _denominator + 1; // update new reserves uint256 _amountInWithFeeLp = (amountIn_ * (REVERSE_FEES_TOTAL + FEES_LP)) / FEES_BASE; newReserveIn_ = _reserveIn + _amountInWithFeeLp; newFictiveReserveIn_ = _fictiveReserveIn + _amountInWithFeeLp; newReserveOut_ = _reserveOut - _amountOut; newFictiveReserveOut_ = _fictiveReserveOut - _amountOut; } /** * @notice return the amount of tokens the user would get by doing a swap * @param _amountIn quantity of token the user want to swap (to sell) * @param _reserveIn reserves of the selling token (getReserve()) * @param _reserveOut reserves of the buying token (getReserve()) * @param _fictiveReserveIn fictive reserve of the selling token (getFictiveReserves()) * @param _fictiveReserveOut fictive reserve of the buying token (getFictiveReserves()) * @param _priceAverageIn price average of the selling token * @param _priceAverageOut price average of the buying token * @return amountOut_ The amount of token the user would receive * @return newReserveIn_ reserves of the selling token after the swap * @return newReserveOut_ reserves of the buying token after the swap * @return newFictiveReserveIn_ fictive reserve of the selling token after the swap * @return newFictiveReserveOut_ fictive reserve of the buying token after the swap */ function getAmountOut( uint256 _amountIn, uint256 _reserveIn, uint256 _reserveOut, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageIn, uint256 _priceAverageOut ) internal pure returns ( uint256 amountOut_, uint256 newReserveIn_, uint256 newReserveOut_, uint256 newFictiveReserveIn_, uint256 newFictiveReserveOut_ ) { require(_amountIn > 0, "SmarDexLibrary: INSUFFICIENT_INPUT_AMOUNT"); require( _reserveIn > 0 && _reserveOut > 0 && _fictiveReserveIn > 0 && _fictiveReserveOut > 0, "SmarDexLibrary: INSUFFICIENT_LIQUIDITY" ); uint256 _amountInWithFees = (_amountIn * REVERSE_FEES_TOTAL) / FEES_BASE; uint256 _firstAmountIn = computeFirstTradeQtyIn( _amountInWithFees, _fictiveReserveIn, _fictiveReserveOut, _priceAverageIn, _priceAverageOut ); // if there is 2 trade: 1st trade mustn't re-compute fictive reserves, 2nd should if ( _firstAmountIn == _amountInWithFees && ratioApproxEq(_fictiveReserveIn, _fictiveReserveOut, _priceAverageIn, _priceAverageOut) ) { (_fictiveReserveIn, _fictiveReserveOut) = computeFictiveReserves( _reserveIn, _reserveOut, _fictiveReserveIn, _fictiveReserveOut ); } // avoid stack too deep { uint256 _firstAmountInNoFees = (_firstAmountIn * FEES_BASE) / REVERSE_FEES_TOTAL; ( amountOut_, newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ) = applyKConstRuleOut( _firstAmountInNoFees, _reserveIn, _reserveOut, _fictiveReserveIn, _fictiveReserveOut ); // update amountIn in case there is a second trade _amountIn -= _firstAmountInNoFees; } // if we need a second trade if (_firstAmountIn < _amountInWithFees) { // in the second trade ALWAYS recompute fictive reserves (newFictiveReserveIn_, newFictiveReserveOut_) = computeFictiveReserves( newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ); uint256 _secondAmountOutNoFees; ( _secondAmountOutNoFees, newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ) = applyKConstRuleOut( _amountIn, newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ); amountOut_ += _secondAmountOutNoFees; } } /** * @notice return the amount of tokens the user should spend by doing a swap * @param _amountOut quantity of token the user want to swap (to buy) * @param _reserveIn reserves of the selling token (getReserve()) * @param _reserveOut reserves of the buying token (getReserve()) * @param _fictiveReserveIn fictive reserve of the selling token (getFictiveReserves()) * @param _fictiveReserveOut fictive reserve of the buying token (getFictiveReserves()) * @param _priceAverageIn price average of the selling token * @param _priceAverageOut price average of the buying token * @return amountIn_ The amount of token the user would spend to receive _amountOut * @return newReserveIn_ reserves of the selling token after the swap * @return newReserveOut_ reserves of the buying token after the swap * @return newFictiveReserveIn_ fictive reserve of the selling token after the swap * @return newFictiveReserveOut_ fictive reserve of the buying token after the swap */ function getAmountIn( uint256 _amountOut, uint256 _reserveIn, uint256 _reserveOut, uint256 _fictiveReserveIn, uint256 _fictiveReserveOut, uint256 _priceAverageIn, uint256 _priceAverageOut ) internal pure returns ( uint256 amountIn_, uint256 newReserveIn_, uint256 newReserveOut_, uint256 newFictiveReserveIn_, uint256 newFictiveReserveOut_ ) { require(_amountOut > 0, "SmarDexLibrary: INSUFFICIENT_OUTPUT_AMOUNT"); require( _amountOut < _fictiveReserveOut && _reserveIn > 0 && _reserveOut > 0 && _fictiveReserveIn > 0 && _fictiveReserveOut > 0, "SmarDexLibrary: INSUFFICIENT_LIQUIDITY" ); uint256 _firstAmountOut = computeFirstTradeQtyOut( _amountOut, _fictiveReserveIn, _fictiveReserveOut, _priceAverageIn, _priceAverageOut ); // if there is 2 trade: 1st trade mustn't re-compute fictive reserves, 2nd should if ( _firstAmountOut == _amountOut && ratioApproxEq(_fictiveReserveIn, _fictiveReserveOut, _priceAverageIn, _priceAverageOut) ) { (_fictiveReserveIn, _fictiveReserveOut) = computeFictiveReserves( _reserveIn, _reserveOut, _fictiveReserveIn, _fictiveReserveOut ); } (amountIn_, newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_) = applyKConstRuleIn( _firstAmountOut, _reserveIn, _reserveOut, _fictiveReserveIn, _fictiveReserveOut ); // if we need a second trade if (_firstAmountOut < _amountOut) { // in the second trade ALWAYS recompute fictive reserves (newFictiveReserveIn_, newFictiveReserveOut_) = computeFictiveReserves( newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ); uint256 _secondAmountIn; ( _secondAmountIn, newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ) = applyKConstRuleIn( _amountOut - _firstAmountOut, newReserveIn_, newReserveOut_, newFictiveReserveIn_, newFictiveReserveOut_ ); amountIn_ += _secondAmountIn; } } }
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity =0.8.17; /** * @title TransferHelper * @notice helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false * @custom:from Uniswap lib, adapted to version 0.8.17 * @custom:url https://github.com/Uniswap/solidity-lib/blob/master/contracts/libraries/TransferHelper.sol */ library TransferHelper { function safeApprove(address token, address to, uint256 value) internal { // bytes4(keccak256(bytes('approve(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper::safeApprove: approve failed" ); } function safeTransfer(address token, address to, uint256 value) internal { // bytes4(keccak256(bytes('transfer(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper::safeTransfer: transfer failed" ); } function safeTransferFrom(address token, address from, address to, uint256 value) internal { // bytes4(keccak256(bytes('transferFrom(address,address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper::transferFrom: transferFrom failed" ); } function safeTransferETH(address to, uint256 value) internal { (bool success, ) = to.call{ value: value }(new bytes(0)); require(success, "TransferHelper::safeTransferETH: ETH transfer failed"); } }
{ "metadata": { "bytecodeHash": "none", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 999999 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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pe":"uint256"},{"internalType":"uint256","name":"_fictiveReserveOut","type":"uint256"},{"internalType":"uint256","name":"_priceAverageLastTimestamp","type":"uint256"},{"internalType":"uint256","name":"_priceAverageIn","type":"uint256"},{"internalType":"uint256","name":"_priceAverageOut","type":"uint256"},{"internalType":"uint256","name":"_currentTimestamp","type":"uint256"}],"name":"getUpdatedPriceAverage","outputs":[{"internalType":"uint256","name":"priceAverageIn_","type":"uint256"},{"internalType":"uint256","name":"priceAverageOut_","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token0","type":"address"},{"internalType":"address","name":"_token1","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount0","type":"uint256"},{"internalType":"uint256","name":"_amount1","type":"uint256"},{"internalType":"address","name":"_payer","type":"address"}],"name":"mint","outputs":[{"internalType":"uint256","name":"liquidity_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"bool","name":"_zeroForOne","type":"bool"},{"internalType":"int256","name":"_amountSpecified","type":"int256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"swap","outputs":[{"internalType":"int256","name":"amount0_","type":"int256"},{"internalType":"int256","name":"amount1_","type":"int256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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