From 870073345b6a1425be9574b63013ae08c211ccfc Mon Sep 17 00:00:00 2001
From: Arvid Norberg <arvid@libtorrent.org>
Date: Sat, 10 May 2014 23:38:54 +0000
Subject: [PATCH] merged sparse file fix from RC_0_16

---
 ChangeLog    | 1 +
 src/file.cpp | 8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 6e8e32907..80e2ca869 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -50,6 +50,7 @@
 	* fix uTP edge case where udp socket buffer fills up
 	* fix nagle implementation in uTP
 
+	* fixed sparse file detection on windows
 	* fixed bug in gunzip
 	* fix to use proxy settings when adding .torrent file from URL
 	* fix resume file issue related to daylight savings time on windows
diff --git a/src/file.cpp b/src/file.cpp
index fb9e0fc7f..5f97940b7 100644
--- a/src/file.cpp
+++ b/src/file.cpp
@@ -1317,8 +1317,12 @@ typedef struct _FILE_ALLOCATED_RANGE_BUFFER {
 			return true;
 		}
 
-		// if we only have a single range in the file, we're not sparse
-		return returned_bytes != sizeof(FILE_ALLOCATED_RANGE_BUFFER);
+		// if we have more than one range in the file, we're sparse
+		if (returned_bytes != sizeof(FILE_ALLOCATED_RANGE_BUFFER)) {
+			return true;
+		}
+
+		return (in.Length.QuadPart != out[0].Length.QuadPart);
 	}
 #endif