v4-core/contracts/libraries/FeeLibrary.sol at main · codewithgun/v4-core · GitHub

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// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.20;

library FeeLibrary {
    uint24 public constant STATIC_FEE_MASK = 0x0FFFFF;
    uint24 public constant DYNAMIC_FEE_FLAG = 0x800000; // 1000
    uint24 public constant HOOK_SWAP_FEE_FLAG = 0x400000; // 0100
    uint24 public constant HOOK_WITHDRAW_FEE_FLAG = 0x200000; // 0010

    function isDynamicFee(uint24 self) internal pure returns (bool) {
        return self & DYNAMIC_FEE_FLAG != 0;
    }

    function hasHookSwapFee(uint24 self) internal pure returns (bool) {
        return self & HOOK_SWAP_FEE_FLAG != 0;
    }

    function hasHookWithdrawFee(uint24 self) internal pure returns (bool) {
        return self & HOOK_WITHDRAW_FEE_FLAG != 0;
    }

    function isStaticFeeTooLarge(uint24 self) internal pure returns (bool) {
        return self & STATIC_FEE_MASK >= 1000000;
    }

    function getStaticFee(uint24 self) internal pure returns (uint24) {
        return self & STATIC_FEE_MASK;
    }
}