Moved quotedprintable to own library, completed a little work on IMF parsing

src/core/lib/QuotedPrintable.mjs

@@ -0,0 +1,37 @@
+/**
+ * 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";
+
+/**
+ * @param {string} input
+ * @returns {byteArray}
+ */
+export function decodeQuotedPrintable(input) {
+    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;
+}

src/core/operations/FromQuotedPrintable.mjs

@@ -9,6 +9,7 @@
  */
 
 import Operation from "../Operation";
+import {decodeQuotedPrintable} from "../lib/QuotedPrintable"
 
 /**
  * From Quoted Printable operation
@@ -43,25 +44,7 @@ class FromQuotedPrintable extends Operation {
      * @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;
+        return decodeQuotedPrintable(input);
     }
 
 }

src/core/operations/ParseIMF.mjs

@@ -8,6 +8,7 @@
  import OperationError from "../errors/OperationError";
  import cptable from "../vendor/js-codepage/cptable.js";
  import {fromBase64} from "../lib/Base64";
+ import {decodeQuotedPrintable} from "../lib/QuotedPrintable"
  import {MIME_FORMAT} from "../lib/ChrEnc";
 
 
@@ -35,10 +36,10 @@
  //TODO: should 8 bit and 7 bit be treated the same?
  const DECODER = {
      "base64": function (input) {
-         return Utils.fromBase64(input, Base64.ALPHABET, "string", true);
+         return fromBase64(input, Base64.ALPHABET, "string", true);
      },
      "quoted-printable": function (input) {
-         return QuotedPrintable.mimeDecode(input);
+         return decodeQuotedPrintable(input);
      },
      "7bit": function (input) {
          return input;
@@ -79,11 +80,11 @@
     if (!input) {
         return;
     }
-    let headerBody = Email._splitHeaderFromBody(input);
+    let headerBody = this.splitHeaderFromBody(input);
     let header = headerBody[0];
-    let headerArray = Email._parseHeader(header);
+    let headerArray = this.parseHeader(header);
     if (args[0]) {
-        header = Email._replaceDecodeWord(header);
+        header = this.replaceDecodeWord(header);
     }
     return JSON.stringify(headerArray);
   }