ESM: Ported HTML, Unicode, Quoted Printable and Endian operations

src/core/operations/SwapEndianness.mjs

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+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Utils from "../Utils";
+import {toHex, fromHex} from "../lib/Hex";
+import OperationError from "../errors/OperationError";
+
+/**
+ * Swap endianness operation
+ */
+class SwapEndianness extends Operation {
+
+    /**
+     * SwapEndianness constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Swap endianness";
+        this.module = "Default";
+        this.description = "Switches the data from big-endian to little-endian or vice-versa. Data can be read in as hexadecimal or raw bytes. It will be returned in the same format as it is entered.";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Data format",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            },
+            {
+                "name": "Word length (bytes)",
+                "type": "number",
+                "value": 4
+            },
+            {
+                "name": "Pad incomplete words",
+                "type": "boolean",
+                "value": true
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [dataFormat, wordLength, padIncompleteWords] = args,
+            result = [],
+            words = [];
+        let i = 0,
+            j = 0,
+            data = [];
+
+        if (wordLength <= 0) {
+            throw new OperationError("Word length must be greater than 0");
+        }
+
+        // Convert input to raw data based on specified data format
+        switch (dataFormat) {
+            case "Hex":
+                data = fromHex(input);
+                break;
+            case "Raw":
+                data = Utils.strToByteArray(input);
+                break;
+            default:
+                data = input;
+        }
+
+        // Split up into words
+        for (i = 0; i < data.length; i += wordLength) {
+            const word = data.slice(i, i + wordLength);
+
+            // Pad word if too short
+            if (padIncompleteWords && word.length < wordLength){
+                for (j = word.length; j < wordLength; j++) {
+                    word.push(0);
+                }
+            }
+
+            words.push(word);
+        }
+
+        // Swap endianness and flatten
+        for (i = 0; i < words.length; i++) {
+            j = words[i].length;
+            while (j--) {
+                result.push(words[i][j]);
+            }
+        }
+
+        // Convert data back to specified data format
+        switch (dataFormat) {
+            case "Hex":
+                return toHex(result);
+            case "Raw":
+                return Utils.byteArrayToUtf8(result);
+            default:
+                return result;
+        }
+    }
+
+    /**
+     * Highlight Swap endianness
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlight(pos, args) {
+        return pos;
+    }
+
+    /**
+     * Highlight Swap endianness in reverse
+     *
+     * @param {Object[]} pos
+     * @param {number} pos[].start
+     * @param {number} pos[].end
+     * @param {Object[]} args
+     * @returns {Object[]} pos
+     */
+    highlightReverse(pos, args) {
+        return pos;
+    }
+
+}
+
+export default SwapEndianness;