From a28e2a86069d7c1f93d16b707be4b89fcec59879 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jean-Pierre=20Andr=C3=A9?= <jpandre@users.sourceforge.net>
Date: Tue, 6 Aug 2013 11:39:13 +0200
Subject: [PATCH] Fixed dealing with errors getting the file size from Windows

Using SetFilePointer() for compatibility with old Windows implies
a specific management of errors....
---
 libntfs-3g/win32_io.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libntfs-3g/win32_io.c b/libntfs-3g/win32_io.c
index 6195f8a5..b7e1cc92 100644
--- a/libntfs-3g/win32_io.c
+++ b/libntfs-3g/win32_io.c
@@ -592,9 +592,11 @@ static s64 ntfs_device_win32_getsize(HANDLE handle)
 {
 	LONG loword, hiword;
 
+	SetLastError(NO_ERROR);
 	hiword = 0;
 	loword = SetFilePointer(handle, 0, &hiword, 2);
-	if (loword == INVALID_FILE_SIZE) {
+	if ((loword == INVALID_SET_FILE_POINTER)
+	    && (GetLastError() != NO_ERROR)) {
 		errno = ntfs_w32error_to_errno(GetLastError());
 		ntfs_log_trace("Couldn't get file size.\n");
 		return -1;