ESM: Ported StrUtils and NetBIOS operations.

src/core/operations/DecodeNetBIOSName.mjs

@@ -0,0 +1,59 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+
+/**
+ * Decode NetBIOS Name operation
+ */
+class DecodeNetBIOSName extends Operation {
+
+    /**
+     * DecodeNetBIOSName constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Decode NetBIOS Name";
+        this.module = "Default";
+        this.description = "NetBIOS names as seen across the client interface to NetBIOS are exactly 16 bytes long. Within the NetBIOS-over-TCP protocols, a longer representation is used.<br><br>There are two levels of encoding. The first level maps a NetBIOS name into a domain system name.  The second level maps the domain system name into the 'compressed' representation required for interaction with the domain name system.<br><br>This operation decodes the first level of encoding. See RFC 1001 for full details.";
+        this.inputType = "byteArray";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                "name": "Offset",
+                "type": "number",
+                "value": 65
+            }
+        ];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        const output = [],
+            offset = args[0];
+
+        if (input.length <= 32 && (input.length % 2) === 0) {
+            for (let i = 0; i < input.length; i += 2) {
+                output.push((((input[i] & 0xff) - offset) << 4) |
+                            (((input[i + 1] & 0xff) - offset) & 0xf));
+            }
+            for (let i = output.length - 1; i > 0; i--) {
+                if (output[i] === 32) output.splice(i, i);
+                else break;
+            }
+        }
+
+        return output;
+    }
+
+}
+
+export default DecodeNetBIOSName;