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@@ -0,0 +1,98 @@
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+/**
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+ * @author tedk [tedk@ted.do]
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+ * @copyright Crown Copyright 2024
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+ * @license Apache-2.0
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+ */
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+
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+import Operation from "../Operation.mjs";
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+
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+/**
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+ * Caret/M-decode operation
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+ *
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+ * https://gist.githubusercontent.com/JaHIY/3c91bbf7bea5661e6abfbd1349ee81a2/raw/c7b480e9ff24bcb8f5287a8a8a2dcb9bf5628506/decode_m_notation.cpp
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+ */
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+class CaretMdecode extends Operation {
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+
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+ /**
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+ * CaretMdecode constructor
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+ */
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+ constructor() {
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+ super();
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+
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+ this.name = "Caret/M-decode";
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+ this.module = "Default";
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+ this.description = "Decodes caret or M-encoded strings, i.e. ^M turns into a newline, M-^] turns into 0x9d. Sources such as `cat -v`.\n\nPlease be aware that when using `cat -v` ^_ (caret-underscore) will not be encoded, but represents a valid encoding (namely that of 0x1f).";
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+ this.infoURL = "https://en.wikipedia.org/wiki/Caret_notation";
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+ this.inputType = "string";
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+ this.outputType = "byteArray";
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+ this.args = [];
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+ }
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+
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+ /**
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+ * @param {string} input
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+ * @param {Object[]} args
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+ * @returns {byteArray}
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+ */
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+ run(input, args) {
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+
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+ const bytes = [];
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+
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+ let prev = "";
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+
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+ for (let i = 0; i < input.length; i++) {
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+
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+ const charCode = input.charCodeAt(i);
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+ const curChar = input.charAt(i);
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+
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+ if (prev === "M-^") {
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+ if (charCode > 63 && charCode <= 95) {
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+ bytes.push(charCode + 64);
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+ } else if (charCode === 63) {
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+ bytes.push(255);
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+ } else {
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+ bytes.push(77, 45, 94, charCode);
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+ }
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+ prev = "";
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+ } else if (prev === "M-") {
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+ if (curChar === "^") {
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+ prev = prev + "^";
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+ } else if (charCode >= 32 && charCode <= 126) {
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+ bytes.push(charCode + 128);
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+ prev = "";
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+ } else {
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+ bytes.push(77, 45, charCode);
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+ prev = "";
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+ }
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+ } else if (prev === "M") {
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+ if (curChar === "-") {
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+ prev = prev + "-";
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+ } else {
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+ bytes.push(77, charCode);
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+ prev = "";
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+ }
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+ } else if (prev === "^") {
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+ if (charCode > 63 && charCode <= 126) {
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+ bytes.push(charCode - 64);
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+ } else if (charCode === 63) {
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+ bytes.push(127);
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+ } else {
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+ bytes.push(94, charCode);
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+ }
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+ prev = "";
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+ } else {
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+ if (curChar === "M") {
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+ prev = "M";
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+ } else if (curChar === "^") {
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+ prev = "^";
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+ } else {
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+ bytes.push(charCode);
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+ }
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+ }
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+
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+ }
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+ return bytes;
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+ }
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+
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+}
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+
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+export default CaretMdecode;
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