1 files changed, 70 insertions, 0 deletions
diff --git a/netwerk/dns/mdns/libmdns/fallback/DNSRecord.jsm b/netwerk/dns/mdns/libmdns/fallback/DNSRecord.jsm
new file mode 100644
index 000000000..f5d48731f
--- /dev/null
+++ b/netwerk/dns/mdns/libmdns/fallback/DNSRecord.jsm
@@ -0,0 +1,70 @@
+/* -*- Mode: js; js-indent-level: 2; indent-tabs-mode: nil; tab-width: 2 -*- */
+/* 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/. */
+/* jshint esnext: true, moz: true */
+
+'use strict';
+
+this.EXPORTED_SYMBOLS = ['DNSRecord'];
+
+const { utils: Cu } = Components;
+
+Cu.import('resource://gre/modules/DataWriter.jsm');
+Cu.import('resource://gre/modules/DNSTypes.jsm');
+
+class DNSRecord {
+  constructor(properties = {}) {
+    this.name       = properties.name       || '';
+    this.recordType = properties.recordType || DNS_RECORD_TYPES.ANY;
+    this.classCode  = properties.classCode  || DNS_CLASS_CODES.IN;
+    this.cacheFlush = properties.cacheFlush || false;
+  }
+
+  static parseFromPacketReader(reader) {
+    let name       = reader.getLabel();
+    let recordType = reader.getValue(2);
+    let classCode  = reader.getValue(2);
+    let cacheFlush = (classCode & 0x8000) ? true : false;
+    classCode &= 0xff;
+
+    return new this({
+      name: name,
+      recordType: recordType,
+      classCode: classCode,
+      cacheFlush: cacheFlush
+    });
+  }
+
+  serialize() {
+    let writer = new DataWriter();
+
+    // Write `name` (ends with trailing 0x00 byte)
+    writer.putLabel(this.name);
+
+    // Write `recordType` (2 bytes)
+    writer.putValue(this.recordType, 2);
+
+    // Write `classCode` (2 bytes)
+    let classCode = this.classCode;
+    if (this.cacheFlush) {
+      classCode |= 0x8000;
+    }
+    writer.putValue(classCode, 2);
+
+    return writer.data;
+  }
+
+  toJSON() {
+    return JSON.stringify(this.toJSONObject());
+  }
+
+  toJSONObject() {
+    return {
+      name: this.name,
+      recordType: this.recordType,
+      classCode: this.classCode,
+      cacheFlush: this.cacheFlush
+    };
+  }
+}