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ERC-20
Overview
Max Total Supply
1.001622024573066527 SDEX-LP
Holders
2
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
1.001622024573065527 SDEX-LPValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x9fcF8F5B...C342A8Bd4 The constructor portion of the code might be different and could alter the actual behaviour of the contract
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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