Separated out Diff and Windows Filetime operations into their own namespaces as they rely on libraries not used by the rest of the operations in their group

src/core/operations/Filetime.js

@@ -0,0 +1,99 @@
+import {BigInteger} from "jsbn";
+
+/**
+ * Windows Filetime operations.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ *
+ * @namespace
+ */
+const Filetime = {
+
+    /**
+     * @constant
+     * @default
+     */
+    UNITS: ["Seconds (s)", "Milliseconds (ms)", "Microseconds (μs)", "Nanoseconds (ns)"],
+
+    /**
+     * @constant
+     * @default
+     */
+    FILETIME_FORMATS: ["Decimal", "Hex"],
+
+    /**
+     * Windows Filetime to Unix Timestamp operation.
+     *
+     * @author bwhitn [brian.m.whitney@outlook.com]
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    runFromFiletimeToUnix: function(input, args) {
+        let units = args[0],
+            format = args[1];
+
+        if (format === "Hex") {
+            input = new BigInteger(input, 16);
+        } else {
+            input = new BigInteger(input);
+        }
+
+        input = input.subtract(new BigInteger("116444736000000000"));
+
+        if (units === "Seconds (s)"){
+            input = input.divide(new BigInteger("10000000"));
+        } else if (units === "Milliseconds (ms)") {
+            input = input.divide(new BigInteger("10000"));
+        } else if (units === "Microseconds (μs)") {
+            input = input.divide(new BigInteger("10"));
+        } else if (units === "Nanoseconds (ns)") {
+            input = input.multiply(new BigInteger("100"));
+        } else {
+            throw "Unrecognised unit";
+        }
+
+        return input.toString();
+    },
+
+
+    /**
+     * Unix Timestamp to Windows Filetime operation.
+     *
+     * @author bwhitn [brian.m.whitney@outlook.com]
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    runToFiletimeFromUnix: function(input, args) {
+        let units = args[0],
+            format = args[1];
+
+        input = new BigInteger(input);
+
+        if (units === "Seconds (s)"){
+            input = input.multiply(new BigInteger("10000000"));
+        } else if (units === "Milliseconds (ms)") {
+            input = input.multiply(new BigInteger("10000"));
+        } else if (units === "Microseconds (μs)") {
+            input = input.multiply(new BigInteger("10"));
+        } else if (units === "Nanoseconds (ns)") {
+            input = input.divide(new BigInteger("100"));
+        } else {
+            throw "Unrecognised unit";
+        }
+
+        input = input.add(new BigInteger("116444736000000000"));
+
+        if (format === "Hex"){
+            return input.toString(16);
+        } else {
+            return input.toString();
+        }
+    },
+
+};
+
+export default Filetime;