From 92277ccde0c54afb526b190195b9cc45d46a3dc5 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Sun, 27 Aug 2017 02:33:37 +0100
Subject: [PATCH] jingle_ft: Add support for empty range elements.

These can be used to indicate support for ranged transfers.
---
 src/jingle_ft.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/jingle_ft.rs b/src/jingle_ft.rs
index 1931aabd535f76dff19e2bd10029ffee11cc2b1b..876aae37a76e740ab1547ea340c9eb413815820b 100644
--- a/src/jingle_ft.rs
+++ b/src/jingle_ft.rs
@@ -28,7 +28,7 @@ impl IntoElements for Range {
     fn into_elements(self, emitter: &mut ElementEmitter) {
         let mut elem = Element::builder("range")
                                .ns(ns::JINGLE_FT)
-                               .attr("offset", self.offset)
+                               .attr("offset", if self.offset == 0 { None } else { Some(self.offset) })
                                .attr("length", self.length)
                                .build();
         for hash in self.hashes {