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

src/core/operations/FromQuotedPrintable.mjs

@@ -0,0 +1,61 @@
+/**
+ * Some parts taken from mimelib (http://github.com/andris9/mimelib)
+ * @author Andris Reinman
+ * @license MIT
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+
+/**
+ * From Quoted Printable operation
+ */
+class FromQuotedPrintable extends Operation {
+
+    /**
+     * FromQuotedPrintable constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "From Quoted Printable";
+        this.module = "Default";
+        this.description = "Converts QP-encoded text back to standard text.";
+        this.inputType = "string";
+        this.outputType = "byteArray";
+        this.args = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        const str = input.replace(/=(?:\r?\n|$)/g, "");
+
+        const encodedBytesCount = (str.match(/=[\da-fA-F]{2}/g) || []).length,
+            bufferLength = str.length - encodedBytesCount * 2,
+            buffer = new Array(bufferLength);
+        let chr, hex,
+            bufferPos = 0;
+
+        for (let i = 0, len = str.length; i < len; i++) {
+            chr = str.charAt(i);
+            if (chr === "=" && (hex = str.substr(i + 1, 2)) && /[\da-fA-F]{2}/.test(hex)) {
+                buffer[bufferPos++] = parseInt(hex, 16);
+                i += 2;
+                continue;
+            }
+            buffer[bufferPos++] = chr.charCodeAt(0);
+        }
+
+        return buffer;
+    }
+
+}
+
+export default FromQuotedPrintable;