Add new operation: From/To MS-DOS Date and Time

src/core/config/Categories.json

@@ -344,6 +344,8 @@
             "To UNIX Timestamp",
             "Windows Filetime to UNIX Timestamp",
             "UNIX Timestamp to Windows Filetime",
+            "From MS-DOS Date and Time",
+            "To MS-DOS Date and Time",
             "DateTime Delta",
             "Extract dates",
             "Get Time",

src/core/operations/FromMSDOSDateAndTime.mjs

@@ -0,0 +1,87 @@
+/**
+ * @author mikecat
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import moment from "moment-timezone";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * From MS-DOS Date and Time operation
+ */
+class FromMSDOSDateAndTime extends Operation {
+
+    /**
+     * FromMSDOSDateAndTime constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "From MS-DOS Date and Time";
+        this.module = "Default";
+        this.description = "Receives a space-separated pair of MS-DOS date and time (16-bit unsigned integers) in this order and returns the corresponding datetime in <code>yyyy-MM-dd HH:mm:ss</code> format.<br><br>Some examples of where MS-DOS date and time are used are ZIP archive file and FAT filesystem.";
+        this.infoURL = "https://learn.microsoft.com/en-us/windows/win32/sysinfo/ms-dos-date-and-time";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Input Format",
+                "type": "option",
+                "value": ["Decimal", "Hex"]
+            },
+            {
+                "name": "Validate datetime",
+                "type": "boolean",
+                "value": true
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const inputFormat = args[0], validate = args[1];
+        const radixTable = {"Decimal": 10, "Hex": 16};
+        if (!(inputFormat in radixTable)) {
+            throw new OperationError("undefined input format");
+        }
+        const radix = radixTable[inputFormat];
+        const inputParts = input.split(/\s+/);
+        if (inputParts.length < 2) {
+            throw new OperationError("invalid input");
+        }
+        const dateInput = parseInt(inputParts[0], radix);
+        const timeInput = parseInt(inputParts[1], radix);
+        if (isNaN(dateInput) || dateInput < 0 || 0xffff < dateInput ||
+        isNaN(timeInput) || timeInput < 0 || 0xffff < timeInput) {
+            throw new OperationError("invalid input");
+        }
+        const year = ((dateInput >> 9) & 0x7f) + 1980;
+        const month = (dateInput >> 5) & 0x0f;
+        const date = dateInput & 0x1f;
+        const hour = (timeInput >> 11) & 0x1f;
+        const minute = (timeInput >> 5) & 0x3f;
+        const second = (timeInput & 0x1f) << 1;
+
+        if (validate) {
+            const m = moment([year, month - 1, date, hour, minute, second]);
+            if (!m.isValid()) {
+                throw new OperationError("invalid datetime");
+            }
+        }
+
+        const toTwoDigits = function(value) {
+            return (value >= 10 ? "" : "0") + value;
+        };
+        return "" + year + "-" + toTwoDigits(month) + "-" + toTwoDigits(date) +
+            " " + toTwoDigits(hour) + ":" + toTwoDigits(minute) + ":" + toTwoDigits(second);
+    }
+
+}
+
+export default FromMSDOSDateAndTime;

src/core/operations/ToMSDOSDateAndTime.mjs

@@ -0,0 +1,90 @@
+/**
+ * @author mikecat
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import moment from "moment-timezone";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * To MS-DOS Date and Time operation
+ */
+class ToMSDOSDateAndTime extends Operation {
+
+    /**
+     * ToMSDOSDateAndTime constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "To MS-DOS Date and Time";
+        this.module = "Default";
+        this.description = "Parses a datetime string and returns the corresponding space-separated pair of MS-DOS date and time in this order.<br>Each of date and time are represented as 16-bit unsigned integers.<br>Years between 1980 and 2107 (inclusive) are supported.<br><br>Some examples of where MS-DOS date and time are used are ZIP archive file and FAT filesystem.";
+        this.infoURL = "https://learn.microsoft.com/en-us/windows/win32/sysinfo/ms-dos-date-and-time";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Output Format",
+                "type": "option",
+                "value": ["Decimal", "Hex"]
+            },
+            {
+                "name": "Show parsed datetime",
+                "type": "boolean",
+                "value": true
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const outputFormat = args[0], showDate = args[1];
+        const date = moment(input);
+        if (!date.isValid()) {
+            throw new OperationError("invalid input");
+        }
+        const outputFormatter = (function() {
+            switch (outputFormat) {
+                case "Decimal":
+                    return function(value) {
+                        return value.toString();
+                    };
+                case "Hex":
+                    return function(value) {
+                        const result = value.toString(16);
+                        if (result.length >= 4) return result;
+                        return ("0000" + result).substring(result.length);
+                    };
+                default:
+                    throw new OperationError("undefined output format");
+            }
+        })();
+        const year = date.year();
+        if (year < 1980 || 2107 < year) {
+            throw new OperationError("out-of-range");
+        }
+        const dateOut =
+            ((year - 1980) << 9) |
+            ((date.month() + 1) << 5) |
+            date.date();
+        const timeOut =
+            (date.hour() << 11) |
+            (date.minute() << 5) |
+            (date.second() >> 1);
+        const output = outputFormatter(dateOut) + " " + outputFormatter(timeOut);
+        if (showDate) {
+            return output + " (" + date.format("yyyy-MM-DD HH:mm:ss") + ")";
+        }
+        return output;
+    }
+
+}
+
+export default ToMSDOSDateAndTime;

tests/operations/index.mjs

@@ -108,6 +108,7 @@ import "./tests/MIMEDecoding.mjs";
 import "./tests/Modhex.mjs";
 import "./tests/MorseCode.mjs";
 import "./tests/MS.mjs";
+import "./tests/MSDOSDateAndTime.mjs";
 import "./tests/MultipleBombe.mjs";
 import "./tests/MurmurHash3.mjs";
 import "./tests/NetBIOS.mjs";