From 8e6ea20a79fc77b7f8cf5bb97a51bc477600480d Mon Sep 17 00:00:00 2001
From: The3D <emilio@aave.com>
Date: Tue, 21 Jul 2020 09:53:38 +0200
Subject: [PATCH] Added configuration library

---
 contracts/libraries/ReserveConfiguration.sol | 65 ++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 contracts/libraries/ReserveConfiguration.sol

diff --git a/contracts/libraries/ReserveConfiguration.sol b/contracts/libraries/ReserveConfiguration.sol
new file mode 100644
index 00000000..d224305f
--- /dev/null
+++ b/contracts/libraries/ReserveConfiguration.sol
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: agpl-3.0
+pragma solidity ^0.6.8;
+
+import {SafeMath} from '@openzeppelin/contracts/math/SafeMath.sol';
+import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
+
+import {ReserveLogic} from './ReserveLogic.sol';
+import {UserLogic} from './UserLogic.sol';
+import {WadRayMath} from './WadRayMath.sol';
+
+import '../interfaces/IPriceOracleGetter.sol';
+import {IFeeProvider} from '../interfaces/IFeeProvider.sol';
+import '@nomiclabs/buidler/console.sol';
+
+/**
+ * @title ReserveConfiguration library
+ * @author Aave
+ * @title Implements the bitmap logic to handle the configuration mapping
+ */
+library ReserveConfiguration {
+  uint256 constant LTV_MASK = 0xFFFFFFFF0000;
+  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFF0000FFFF;
+  uint256 constant LIQUIDATION_BONUS_MASK = 0x0000FFFFFFFF;
+  uint256 constant LIQUIDATION_BONUS_MASK = 0x00FFFFFFFFFFFF;
+
+  struct Map {
+    //bit 0-15: LTV
+    //bit 16-31: Liq. threshold
+    //bit 32-47: Liq. bonus
+    //bit 48-56: Decimals
+    uint256 data;
+  }
+
+  function setLTV(ReserveConfiguration.Map _self, uint256 _ltv) internal {
+    _self.data = (_self.data & LTV_MASK) | _ltv;
+  }
+
+  function getLTV(ReserveConfiguration.Map _self) internal view returns (uint256) {
+    return _self.data & !LTV_MASK;
+  }
+
+  function setLiquidationThreshold(ReserveConfiguration.Map _self, uint256 _threshold) internal {
+    _self.data = (_self.data & LIQUIDATION_THRESHOLD_MASK) | (_threshold << 16);
+  }
+
+  function getLiquidationThreshold(ReserveConfiguration.Map _self) internal view returns (uint256) {
+    return (_self.data & !LIQUIDATION_THRESHOLD_MASK) >> 16;
+  }
+
+  function setLiquidationBonus(ReserveConfiguration.Map _self, uint256 _bonus) internal {
+    _self.data = (_self.data & LIQUIDATION_BONUS_MASK) | (_bonus << 32);
+  }
+
+  function getLiquidationBonus(ReserveConfiguration.Map _self) internal view returns (uint256) {
+    return (_self.data & !LIQUIDATION_BONUS_MASK) >> 32;
+  }
+
+  function setDecimals(ReserveConfiguration.Map _self, uint256 _decimals) internal {
+    _self.data = (_self.data & DECIMALS_MASK) | (_ltv << 48);
+  }
+
+  function getDecimals(ReserveConfiguration.Map _self) internal view returns (uint256) {
+    return (_self.data & !DECIMALS_MASK) >> 48;
+  }
+}