Adding basic arithmetic operation

src/core/config/Categories.json

@@ -171,7 +171,8 @@
             "Bit shift right",
             "Rotate left",
             "Rotate right",
-            "ROT13"
+            "ROT13",
+            "Add/Subtract/Multiply/Divide by value"
         ]
     },
     {

src/core/lib/Arithmetic.mjs

@@ -35,6 +35,31 @@ export function createNumArray(input, delim) {
     return numbers;
 }
 
+/**
+ * Converts two strings to a number array.
+ *
+ * @param {string} input
+ * @param {string} userValue
+ * @returns {BigNumber[]}
+ */
+export function createNumArrayFromTwoStrings(input, userValue) {
+    const numbers = [];
+    let num;
+    try {
+        num = BigNumber(input.trim());
+        if (!num.isNaN()) {
+            numbers.push(num);
+        }
+        num = BigNumber(userValue.trim());
+        if (!num.isNaN()) {
+            numbers.push(num);
+        }
+    } catch (err) {
+        // This line is not a valid number
+    }
+    return numbers;
+}
+
 
 /**
  * Adds an array of numbers and returns the value.

src/core/lib/Delim.mjs

@@ -46,6 +46,11 @@ export const HASH_DELIM_OPTIONS = ["Line feed", "CRLF", "Space", "Comma"];
  */
 export const IP_DELIM_OPTIONS = ["Line feed", "CRLF", "Space", "Comma", "Semi-colon"];
 
+/**
+ * Math operations
+ */
+ export const ARITMETIC_OPTIONS = ["Add", "Subtract", "Multiply", "Divide"];
+
 /**
  * Split delimiters.
  */

src/core/operations/AddSubMulDivValue.mjs

@@ -0,0 +1,74 @@
+/**
+ * @author BigYellowHammer
+ * @license Apache-2.0
+ */
+
+import BigNumber from "bignumber.js";
+import Operation from "../Operation.mjs";
+import { sum, sub, multi, div, createNumArrayFromTwoStrings } from "../lib/Arithmetic.mjs";
+import { ARITMETIC_OPTIONS } from "../lib/Delim.mjs";
+
+
+/**
+ * Sum operation
+ */
+class AddSubMulDivValue extends Operation {
+
+    /**
+     * Sum constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Add/Subtract/Multiply/Divide by value";
+        this.module = "Default";
+        this.description = "Performs aritmetical operation between the input and argument specified by the user";
+        this.inputType = "string";
+        this.outputType = "BigNumber";
+        this.args = [
+            {
+                "name": "Operation",
+                "type": "option",
+                "value": ARITMETIC_OPTIONS,
+            },
+            {
+                "name": "Value",
+                "type": "shortString",
+                "value": ""
+            },
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {BigNumber}
+     */
+    run(input, args) {
+
+        const arr = createNumArrayFromTwoStrings(input, args[1]);
+        let val;
+
+        switch (args[0]) {
+            case "Add":
+                val = sum(arr);
+                break;
+            case "Subtract":
+                val = sub(arr);
+                break;
+            case "Multiply":
+                val = multi(arr);
+                break;
+            case "Divide":
+                val = div(arr);
+                break;
+            default:
+                break;
+        }
+
+        return BigNumber.isBigNumber(val) ? val : new BigNumber(NaN);
+    }
+
+}
+
+export default AddSubMulDivValue;

tests/operations/index.mjs

@@ -107,6 +107,7 @@ import "./tests/CBORDecode.mjs";
 import "./tests/JA3Fingerprint.mjs";
 import "./tests/JA3SFingerprint.mjs";
 import "./tests/HASSH.mjs";
+import "./tests/AddSubMulDivValue.mjs";
 
 
 // Cannot test operations that use the File type yet

tests/operations/tests/AddSubMulDivValue.mjs

@@ -0,0 +1,50 @@
+/**
+ * BitwiseOp tests
+ *
+ * @author BigYellowHammer
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "Add value",
+        input: "9",
+        expectedOutput: "11",
+        recipeConfig: [
+            { "op": "Add/Subtract/Multiply/Divide by value",
+                "args": ["Add", "2"] },
+
+        ]
+    },
+    {
+        name: "Subtract value",
+        input: "9",
+        expectedOutput: "7",
+        recipeConfig: [
+            { "op": "Add/Subtract/Multiply/Divide by value",
+                "args": ["Subtract", "2"] },
+
+        ]
+    },
+    {
+        name: "Multiply by value",
+        input: "9",
+        expectedOutput: "18",
+        recipeConfig: [
+            { "op": "Add/Subtract/Multiply/Divide by value",
+                "args": ["Multiply", "2"] },
+
+        ]
+    },
+    {
+        name: "Multiply by value",
+        input: "10",
+        expectedOutput: "5",
+        recipeConfig: [
+            { "op": "Add/Subtract/Multiply/Divide by value",
+                "args": ["Divide", "2"] },
+
+        ]
+    }
+]);