From fa72e227d157a7a4e4c4112cb8503ee555f6a9b1 Mon Sep 17 00:00:00 2001
From: zeroXbrock <2791467+zeroXbrock@users.noreply.github.com>
Date: Wed, 17 Jul 2024 18:11:57 -0700
Subject: [PATCH] add Misc lib w/ stripSelector

---
 src/utils/Misc.sol    | 15 +++++++++++++++
 test/utils/Misc.t.sol | 20 ++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 src/utils/Misc.sol
 create mode 100644 test/utils/Misc.t.sol

diff --git a/src/utils/Misc.sol b/src/utils/Misc.sol
new file mode 100644
index 0000000..d2f15c6
--- /dev/null
+++ b/src/utils/Misc.sol
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+library Misc {
+    /**
+     * @notice Returns the given bytes with the first 4 bytes removed.
+     */
+    function stripSelector(bytes memory data) internal pure returns (bytes memory trimmedData) {
+        trimmedData = new bytes(data.length - 4);
+        assembly {
+            mstore(add(trimmedData, 0x20), sub(mload(add(data, 0x20)), 0x04))
+            mstore(add(trimmedData, 0x20), mload(add(data, 0x24)))
+        }
+    }
+}
diff --git a/test/utils/Misc.t.sol b/test/utils/Misc.t.sol
new file mode 100644
index 0000000..182642e
--- /dev/null
+++ b/test/utils/Misc.t.sol
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.13;
+
+import "forge-std/Test.sol";
+import "src/Test.sol";
+import "src/utils/Misc.sol";
+
+contract MiscTest is Test {
+    function x(uint256 n) public pure returns (uint256) {
+        return n;
+    }
+
+    function testStripSelector() public pure {
+        bytes memory suaveCalldata = abi.encodeWithSelector(this.x.selector, 123);
+        bytes memory strippedCalldata = Misc.stripSelector(suaveCalldata);
+        assertEq(strippedCalldata.length, 32);
+        uint256 num = abi.decode(strippedCalldata, (uint256));
+        assertEq(num, 123);
+    }
+}