From 243353a14482b37dc84bd1abfff40049f5d18b18 Mon Sep 17 00:00:00 2001
From: Steven Siloti <ssiloti@gmail.com>
Date: Sat, 12 May 2018 19:12:51 -0700
Subject: [PATCH] account for partially downloaded pieces when announcing as a
 seed

---
 ChangeLog       |  1 +
 src/torrent.cpp | 26 +++++++++++++++++++++++++-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 6a522a5e6..6b5bdd743 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,7 @@
 	* fix backwards compatibility to downloads without partfiles
 	* improve part-file related error messages
 	* fix reporting &redundant= in tracker announces
+	* fix tracker announces reporting more data downloaded than the size of the torrent
 	* fix tie-break in duplicate peer connection disconnect logic
 	* fix issue with SSL tracker connections left in CLOSE_WAIT state
 	* defer truncating existing files until the first time we write to them
diff --git a/src/torrent.cpp b/src/torrent.cpp
index 075bbeb52..fee1f047b 100644
--- a/src/torrent.cpp
+++ b/src/torrent.cpp
@@ -3223,10 +3223,34 @@ namespace {
 		req.ssl_ctx = m_ssl_ctx.get();
 #endif
 
+		req.redundant = m_total_redundant_bytes;
 		// exclude redundant bytes if we should
 		if (!settings().get_bool(settings_pack::report_true_downloaded))
+		{
 			req.downloaded -= m_total_redundant_bytes;
-		req.redundant = m_total_redundant_bytes;
+
+			// if the torrent is complete we know that all incoming pieces will be
+			// marked redundant so add them to the redundant count
+			// this is mainly needed to cover the case where a torrent has just completed
+			// but still has partially downloaded pieces
+			// if the incoming pieces are not accounted for it could cause the downloaded
+			// amount to exceed the total size of the torrent which upsets some trackers
+			if (is_seed())
+			{
+				for (peer_iterator i = m_connections.begin();
+					i != m_connections.end(); ++i)
+				{
+					TORRENT_INCREMENT(m_iterating_connections);
+					peer_connection* p = *i;
+					boost::optional<piece_block_progress> pbp = p->downloading_piece_progress();
+					if (pbp && pbp->bytes_downloaded > 0)
+					{
+						req.downloaded -= pbp->bytes_downloaded;
+						req.redundant += pbp->bytes_downloaded;
+					}
+				}
+			}
+		}
 		if (req.downloaded < 0) req.downloaded = 0;
 
 		req.event = e;