From 62a3ffc3084d8aca2ec7f21f6c75ce13bca7129e Mon Sep 17 00:00:00 2001
From: Ernesto Castellotti <mail@ernestocastellotti.it>
Date: Thu, 23 Mar 2023 20:53:46 +0100
Subject: Tool: GPON OMCI VLAN Table parser  (#164)

* Tool: GPON OMCI VLAN Table parser
---
 assets/js/omci-vlan.js | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 assets/js/omci-vlan.js

(limited to 'assets/js')

diff --git a/assets/js/omci-vlan.js b/assets/js/omci-vlan.js
new file mode 100644
index 0000000..e28642c
--- /dev/null
+++ b/assets/js/omci-vlan.js
@@ -0,0 +1,60 @@
+/* Copyright (C) Ernesto Castellotti <mail@ernestocastellotti.it>
+ * SPDX-License-Identifier: MPL-2.0-no-copyleft-exception
+*/
+
+// Convert hex string to binary representation
+function hex2bin(hexString){
+    var result = "";
+    hexString = hexString.replace(/0x/g, "").replace(/ /g, '').toLowerCase();
+    
+    for(const hexChr of hexString) {
+        const bin = parseInt(hexChr, 16).toString(2).padStart(4, '0');
+        
+        if (!bin.isNaN) {
+            result += bin;
+        } else {
+            throw new Error("The hex string is not valid!");
+        }
+    }
+
+    return result;
+}
+
+// Helper function to splice binary array and convert to decimal
+function binSpliceToDec(binArray, len) {
+    const result = binArray.splice(0, len);
+    return parseInt(result.join(""), 2);
+}
+
+// GPON OMCI VLAN Table parser
+function vlanTableParse(hexString) {
+    const binaryArray = hex2bin(hexString).split('');
+    var result = new Array();
+        
+    while(binaryArray.length > 0) {
+        var vlanRule = new Array();
+            
+        vlanRule.push(binSpliceToDec(binaryArray, 4));
+        vlanRule.push(binSpliceToDec(binaryArray, 13));
+        vlanRule.push(binSpliceToDec(binaryArray, 3));
+        binaryArray.splice(0, 12); // Padding
+        vlanRule.push( binSpliceToDec(binaryArray, 4));
+        vlanRule.push(binSpliceToDec(binaryArray, 13));
+        vlanRule.push(binSpliceToDec(binaryArray, 3));
+        binaryArray.splice(0, 8); // Padding
+        vlanRule.push(binSpliceToDec(binaryArray, 4));
+        vlanRule.push(binSpliceToDec(binaryArray, 2));
+        binaryArray.splice(0, 10); // Padding
+        vlanRule.push(binSpliceToDec(binaryArray, 4));
+        vlanRule.push(binSpliceToDec(binaryArray, 13));
+        vlanRule.push(binSpliceToDec(binaryArray, 3));
+        binaryArray.splice(0, 12); // Padding
+        vlanRule.push(binSpliceToDec(binaryArray, 4));
+        vlanRule.push(binSpliceToDec(binaryArray, 13));
+        vlanRule.push(binSpliceToDec(binaryArray, 3));
+        
+        result.push(vlanRule);
+    }
+        
+    return result;
+}
-- 
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