Add support for more types in Arrays.sol (#5568)

contracts/utils/Arrays.sol

@@ -414,6 +414,32 @@ library Arrays {
         return slot.deriveArray().offset(pos).getUint256Slot();
     }
 
+    /**
+     * @dev Access an array in an "unsafe" way. Skips solidity "index-out-of-range" check.
+     *
+     * WARNING: Only use if you are certain `pos` is lower than the array length.
+     */
+    function unsafeAccess(bytes[] storage arr, uint256 pos) internal pure returns (StorageSlot.BytesSlot storage) {
+        bytes32 slot;
+        assembly ("memory-safe") {
+            slot := arr.slot
+        }
+        return slot.deriveArray().offset(pos).getBytesSlot();
+    }
+
+    /**
+     * @dev Access an array in an "unsafe" way. Skips solidity "index-out-of-range" check.
+     *
+     * WARNING: Only use if you are certain `pos` is lower than the array length.
+     */
+    function unsafeAccess(string[] storage arr, uint256 pos) internal pure returns (StorageSlot.StringSlot storage) {
+        bytes32 slot;
+        assembly ("memory-safe") {
+            slot := arr.slot
+        }
+        return slot.deriveArray().offset(pos).getStringSlot();
+    }
+
     /**
      * @dev Access an array in an "unsafe" way. Skips solidity "index-out-of-range" check.
      *
@@ -447,6 +473,28 @@ library Arrays {
         }
     }
 
+    /**
+     * @dev Access an array in an "unsafe" way. Skips solidity "index-out-of-range" check.
+     *
+     * WARNING: Only use if you are certain `pos` is lower than the array length.
+     */
+    function unsafeMemoryAccess(bytes[] memory arr, uint256 pos) internal pure returns (bytes memory res) {
+        assembly {
+            res := mload(add(add(arr, 0x20), mul(pos, 0x20)))
+        }
+    }
+
+    /**
+     * @dev Access an array in an "unsafe" way. Skips solidity "index-out-of-range" check.
+     *
+     * WARNING: Only use if you are certain `pos` is lower than the array length.
+     */
+    function unsafeMemoryAccess(string[] memory arr, uint256 pos) internal pure returns (string memory res) {
+        assembly {
+            res := mload(add(add(arr, 0x20), mul(pos, 0x20)))
+        }
+    }
+
     /**
      * @dev Helper to set the length of a dynamic array. Directly writing to `.length` is forbidden.
      *
@@ -479,4 +527,26 @@ library Arrays {
             sstore(array.slot, len)
         }
     }
+
+    /**
+     * @dev Helper to set the length of a dynamic array. Directly writing to `.length` is forbidden.
+     *
+     * WARNING: this does not clear elements if length is reduced, of initialize elements if length is increased.
+     */
+    function unsafeSetLength(bytes[] storage array, uint256 len) internal {
+        assembly ("memory-safe") {
+            sstore(array.slot, len)
+        }
+    }
+
+    /**
+     * @dev Helper to set the length of a dynamic array. Directly writing to `.length` is forbidden.
+     *
+     * WARNING: this does not clear elements if length is reduced, of initialize elements if length is increased.
+     */
+    function unsafeSetLength(string[] storage array, uint256 len) internal {
+        assembly ("memory-safe") {
+            sstore(array.slot, len)
+        }
+    }
 }