Feat/add onft721msgcodec new decode functions

.changeset/swift-cooks-serve.md

@@ -0,0 +1,5 @@
+---
+"@layerzerolabs/onft-evm": patch
+---
+
+The ONFT721MsgCodec library composeMsg function was ignoring the sender offset when decoding composed messages. Added a new SENDER_OFFSET constant variable and 2 new helper functions composeMsgFrom and composeMsgPayload to decode every member of the composed message separately and keep backwards compatibility.

packages/onft-evm/contracts/onft721/libs/ONFT721MsgCodec.sol

@@ -9,6 +9,7 @@ pragma solidity ^0.8.22;
 library ONFT721MsgCodec {
     uint8 private constant SEND_TO_OFFSET = 32;
     uint8 private constant TOKEN_ID_OFFSET = 64;
+    uint8 private constant SENDER_OFFSET = 96;
 
     /**
      * @dev Encodes an ONFT721 LayerZero message payload.
@@ -65,6 +66,24 @@ library ONFT721MsgCodec {
         return _msg[TOKEN_ID_OFFSET:];
     }
 
+    /**
+     * @dev Decodes the sender of the composed message from the composed message.
+     * @param _msg The message.
+     * @return The sender address of the composed message in bytes32 format.
+     */
+    function composeMsgFrom(bytes calldata _msg) internal pure returns (bytes32) {
+        return bytes32(_msg[TOKEN_ID_OFFSET:SENDER_OFFSET]);
+    }
+
+    /**
+     * @dev Decodes the payload from the composed message.
+     * @param _msg The message.
+     * @return The composed message payload.
+     */
+    function composeMsgPayload(bytes calldata _msg) internal pure returns (bytes memory) {
+        return _msg[SENDER_OFFSET:];
+    }
+
     /**
      * @dev Converts an address to bytes32.
      * @param _addr The address to convert.