From 5a741ce08d225847f45ca30dc372ed0bfa4c0c04 Mon Sep 17 00:00:00 2001
From: Arseny Smirnov <arseny30@gmail.com>
Date: Fri, 28 Dec 2018 16:16:14 +0300
Subject: [PATCH] PartsManager bugfix: do not set bits in bitmask for empty
 parts

GitOrigin-RevId: 5fec69b1e1aed975edb7d9901206262abc7151d3
---
 td/telegram/files/PartsManager.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/td/telegram/files/PartsManager.cpp b/td/telegram/files/PartsManager.cpp
index aaed84ea..c41b3203 100644
--- a/td/telegram/files/PartsManager.cpp
+++ b/td/telegram/files/PartsManager.cpp
@@ -234,7 +234,9 @@ Status PartsManager::on_part_ok(int32 id, size_t part_size, size_t actual_size)
   pending_count_--;
 
   part_status_[id] = PartStatus::Ready;
-  bitmask_.set(id);
+  if (actual_size != 0) {
+    bitmask_.set(id);
+  }
   ready_size_ += narrow_cast<int64>(actual_size);
 
   VLOG(files) << "Transferred part " << id << " of size " << part_size << ", total ready size = " << ready_size_;