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added percentMath

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The3D 2020-07-27 12:32:54 +02:00
parent 729abc0769
commit 4baf17d9e6
1 changed files with 28 additions and 0 deletions
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contracts/libraries/PercentageMath.sol Normal file
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// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.8;
import {SafeMath} from '@openzeppelin/contracts/math/SafeMath.sol';
/**
* @title PercentageMath library
* @author Aave
* @notice Provides functions to calculate percentages. Percentages needs to be defined by default with 2 decimals of precision (100.00)
* @dev Operations are rounded up
**/
library PercentageMath {
using SafeMath for uint256;
uint256 constant PERCENTAGE_FACTOR = 1e2; //percentage plus two decimals
uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;
function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256) {
return HALF_PERCENT.add(value.mul(percentage)).div(PERCENTAGE_FACTOR);
}
function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256) {
uint256 halfPercentage = percentage / 2;
return halfPercentage.add(value.mul(PERCENTAGE_FACTOR)).div(halfPercentage);
}
}