1 files changed, 72 insertions, 0 deletions
diff --git a/comm/mailnews/mime/src/jsmime.jsm b/comm/mailnews/mime/src/jsmime.jsm
new file mode 100644
index 0000000000..407c2aacd1
--- /dev/null
+++ b/comm/mailnews/mime/src/jsmime.jsm
@@ -0,0 +1,72 @@
+/* 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/. */
+// vim:set ts=2 sw=2 sts=2 et ft=javascript:
+
+/**
+ * This file exports the JSMime code, polyfilling code as appropriate for use in
+ * Gecko.
+ */
+
+// Load the core MIME parser. Since it doesn't define EXPORTED_SYMBOLS, we must
+// use the subscript loader instead.
+Services.scriptloader.loadSubScript("resource:///modules/jsmime/jsmime.js");
+
+var EXPORTED_SYMBOLS = ["jsmime"];
+
+function bytesToString(buffer) {
+  var string = "";
+  for (var i = 0; i < buffer.length; i++) {
+    string += String.fromCharCode(buffer[i]);
+  }
+  return string;
+}
+
+// Our UTF-7 decoder.
+function UTF7TextDecoder(options = {}, manager) {
+  this.manager = manager;
+  this.collectInput = "";
+}
+UTF7TextDecoder.prototype = {
+  // Since the constructor checked, this will only be called for UTF-7.
+  decode(input, options = {}) {
+    let more = "stream" in options ? options.stream : false;
+    // There are cases where this is called without input.
+    if (!input) {
+      return "";
+    }
+    this.collectInput += bytesToString(input);
+    if (more) {
+      return "";
+    }
+    return this.manager.utf7ToUnicode(this.collectInput);
+  },
+};
+
+/* exported MimeTextDecoder */
+function MimeTextDecoder(charset, options) {
+  let manager = Cc["@mozilla.org/charset-converter-manager;1"].createInstance(
+    Ci.nsICharsetConverterManager
+  );
+  // The following will throw if the charset is unknown.
+  let newCharset = manager.getCharsetAlias(charset);
+  if (newCharset.toLowerCase() == "utf-7") {
+    return new UTF7TextDecoder(options, manager);
+  }
+  return new TextDecoder(newCharset, options);
+}
+
+// The following code loads custom MIME encoders.
+var CATEGORY_NAME = "custom-mime-encoder";
+Services.obs.addObserver(function (subject, topic, data) {
+  subject = subject.QueryInterface(Ci.nsISupportsCString).data;
+  if (data == CATEGORY_NAME) {
+    let url = Services.catMan.getCategoryEntry(CATEGORY_NAME, subject);
+    Services.scriptloader.loadSubScript(url, {}, "UTF-8");
+  }
+}, "xpcom-category-entry-added");
+
+for (let { data } of Services.catMan.enumerateCategory(CATEGORY_NAME)) {
+  let url = Services.catMan.getCategoryEntry(CATEGORY_NAME, data);
+  Services.scriptloader.loadSubScript(url, {}, "UTF-8");
+}