64 lines
1.6 KiB
Solidity
64 lines
1.6 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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pragma experimental ABIEncoderV2;
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import {SafeMath} from "./SafeMath.sol";
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/**
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* @title DecimalMath
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* @author DODO Breeder
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*
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* @notice Functions for fixed point number with 18 decimals
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*/
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library DecimalMath {
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using SafeMath for uint256;
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uint256 internal constant ONE = 10**18;
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uint256 internal constant ONE2 = 10**36;
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function mulFloor(uint256 target, uint256 d) internal pure returns (uint256) {
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return target.mul(d) / (10**18);
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}
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function mulCeil(uint256 target, uint256 d) internal pure returns (uint256) {
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return target.mul(d).divCeil(10**18);
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}
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function divFloor(uint256 target, uint256 d) internal pure returns (uint256) {
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return target.mul(10**18).div(d);
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}
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function divCeil(uint256 target, uint256 d) internal pure returns (uint256) {
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return target.mul(10**18).divCeil(d);
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}
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function reciprocalFloor(uint256 target) internal pure returns (uint256) {
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return uint256(10**36).div(target);
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}
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function reciprocalCeil(uint256 target) internal pure returns (uint256) {
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return uint256(10**36).divCeil(target);
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}
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function powFloor(uint256 target, uint256 e) internal pure returns (uint256) {
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if (e == 0) {
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return 1;
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} else if (e == 1) {
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return target;
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} else {
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uint p = powFloor(target, e.div(2));
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p = p.mul(p) / (10**18);
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if (e % 2 == 1) {
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p = p.mul(target) / (10**18);
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}
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return p;
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}
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}
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}
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