1 files changed, 31 insertions, 0 deletions
diff --git a/comm/mailnews/mime/src/extraMimeParsers.jsm b/comm/mailnews/mime/src/extraMimeParsers.jsm
new file mode 100644
index 0000000000..b20bd543a1
--- /dev/null
+++ b/comm/mailnews/mime/src/extraMimeParsers.jsm
@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals jsmime */
+
+function parseNewsgroups(headers) {
+  let ng = [];
+  for (let header of headers) {
+    ng = ng.concat(header.split(/\s*,\s*/));
+  }
+  return ng;
+}
+
+function emitNewsgroups(groups) {
+  // Don't encode the newsgroups names in RFC 2047...
+  if (groups.length == 1) {
+    this.addText(groups[0], false);
+  } else {
+    this.addText(groups[0], false);
+    for (let i = 1; i < groups.length; i++) {
+      this.addText(",", false); // only comma, no space!
+      this.addText(groups[i], false);
+    }
+  }
+}
+
+jsmime.headerparser.addStructuredDecoder("Newsgroups", parseNewsgroups);
+jsmime.headerparser.addStructuredDecoder("Followup-To", parseNewsgroups);
+jsmime.headeremitter.addStructuredEncoder("Newsgroups", emitNewsgroups);
+jsmime.headeremitter.addStructuredEncoder("Followup-To", emitNewsgroups);