From ab70090a0a1585b8a32afd05e8bd825cf8bb8493 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Sun, 13 Nov 2016 22:18:32 +0100
Subject: [PATCH] Finally fix bogus terrasync download numbers.

(Staying a hotel with sufficiently slow wi-fi to debug this!)
---
 simgear/io/HTTPRepository.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/simgear/io/HTTPRepository.cxx b/simgear/io/HTTPRepository.cxx
index af4eecfc..5dff9b50 100644
--- a/simgear/io/HTTPRepository.cxx
+++ b/simgear/io/HTTPRepository.cxx
@@ -756,7 +756,12 @@ size_t HTTPRepository::bytesToDownload() const
     }
 
     for (r = _d->activeRequests.begin(); r != _d->activeRequests.end(); ++r) {
-        result += (*r)->contentSize() - (*r)->responseBytesReceived();
+        if ((*r)->contentSize() > 0) {
+            // Content size for root dirindex of a repository is zero,
+            // and returing a negative value breaks everyting, so just ignore
+            // it
+            result += (*r)->contentSize() - (*r)->responseBytesReceived();
+        }
     }
 
     return result;