add helper class to parse meshcore path info

src/hex_util.js

@@ -0,0 +1,11 @@
+class HexUtil {
+
+    static bytesToHex(bytes) {
+        return Array.from(bytes).map((byte) => {
+            return byte.toString(16).padStart(2, "0");
+        }).join("");
+    }
+
+}
+
+export default HexUtil;

src/index.js

@@ -9,6 +9,7 @@ import Advert from "./advert.js";
 import Packet from "./packet.js";
 import BufferUtils from "./buffer_utils.js";
 import CayenneLpp from "./cayenne_lpp.js";
+import MeshCorePath from "./meshore_path.js";
 
 export {
     Connection,
@@ -22,4 +23,5 @@ export {
     Packet,
     BufferUtils,
     CayenneLpp,
+    MeshCorePath,
 };

src/meshore_path.js

@@ -0,0 +1,47 @@
+import BufferReader from "./buffer_reader.js";
+import HexUtil from "./hex_util.js";
+import Packet from "./packet.js";
+
+class MeshCorePath {
+
+    constructor(pathHashSize, pathHashCount, pathItems) {
+        this.pathHashSize = pathHashSize;
+        this.pathHashCount = pathHashCount;
+        this.pathItems = pathItems;
+    }
+
+    static fromPathAndLength(path, pathLen) {
+
+        // make sure path is valid
+        if(pathLen === 0xFF){
+            return null;
+        }
+
+        const pathHashSize = Packet.extractPathHashSize(pathLen);
+        const pathHashCount = Packet.extractPathHashCount(pathLen);
+        const pathByteLength = pathHashCount * pathHashSize;
+        const pathBytes = path.subarray(0, pathByteLength);
+        if(pathBytes.length < pathByteLength){
+            return null;
+        }
+
+        // convert path to comma delimited hex string
+        const pathItems = [];
+        const pathBuffer = new BufferReader(pathBytes);
+        for(var i = 0; i < pathHashCount; i++){
+            pathItems.push(pathBuffer.readBytes(pathHashSize));
+        }
+
+        return new MeshCorePath(pathHashSize, pathHashCount, pathItems);
+
+    }
+
+    toHexPathString() {
+        return this.pathItems.map((pathItem) => {
+            return HexUtil.bytesToHex(pathItem);
+        }).join(",");
+    }
+
+}
+
+export default MeshCorePath;