1 files changed, 20 insertions, 0 deletions
diff --git a/contracts/nativeAssets.sol b/contracts/nativeAssets.sol
new file mode 100644
index 0000000..0656271
--- /dev/null
+++ b/contracts/nativeAssets.sol
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.6.0 <0.8.0;
+
+library NativeAssets {
+    address constant balanceAddr = 0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF;
+    address constant transferAddr = 0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE;
+
+    function assetBalance(address addr, uint256 assetID) public returns (uint256) {
+        (bool success, bytes memory data) = balanceAddr.call(abi.encodePacked(addr, assetID));
+        require(success, "assetBalance failed");
+        return abi.decode(data, (uint256));
+    }
+    
+    function assetCall(address addr, uint256 assetID, uint256 assetAmount, bytes memory callData) public returns (bytes memory) {
+        (bool success, bytes memory data) = transferAddr.call(abi.encodePacked(addr, assetID, assetAmount, callData));
+        require(success, "assetCall failed");
+        return data;
+    }
+}