CCIP-4918 feat: Add SVM encoding and decoding to MessageHasher.sol (#…

…15983)

* CCIP-4918 feat: Add SVM encoding and decoding to MessageHasher.sol

* add changeset file

* [Bot] Update changeset file with jira issues

* change to named init

---------

Co-authored-by: app-token-issuer-infra-releng[bot] <120227048+app-token-issuer-infra-releng[bot]@users.noreply.github.com>

contracts/.changeset/wicked-maps-thank.md

@@ -0,0 +1,10 @@
+---
+'@chainlink/contracts': minor
+---
+
+#internal Add EVM extraArgs encode & decode to MessageHasher
+
+PR issue: CCIP-4918
+
+
+Solidity Review issue: CCIP-3966

contracts/src/v0.8/ccip/test/helpers/MessageHasher.sol

@@ -86,6 +86,28 @@ contract MessageHasher {
     uint256 gasLimit,
     bool allowOutOfOrderExecution
   ) public pure returns (Client.EVMExtraArgsV2 memory) {
-    return Client.EVMExtraArgsV2(gasLimit, allowOutOfOrderExecution);
+    return Client.EVMExtraArgsV2({gasLimit: gasLimit, allowOutOfOrderExecution: allowOutOfOrderExecution});
+  }
+
+  function encodeSVMExtraArgsV1(
+    Client.SVMExtraArgsV1 memory extraArgs
+  ) public pure returns (bytes memory) {
+    return Client._svmArgsToBytes(extraArgs);
+  }
+
+  function decodeSVMExtraArgsV1(
+    uint32 computeUnits,
+    uint64 accountIsWritableBitmap,
+    bool allowOutOfOrderExecution,
+    bytes32 tokenReceiver,
+    bytes32[] memory accounts
+  ) public pure returns (Client.SVMExtraArgsV1 memory) {
+    return Client.SVMExtraArgsV1({
+      computeUnits: computeUnits,
+      accountIsWritableBitmap: accountIsWritableBitmap,
+      allowOutOfOrderExecution: allowOutOfOrderExecution,
+      tokenReceiver: tokenReceiver,
+      accounts: accounts
+    });
   }
 }