1 files changed, 15 insertions, 2 deletions

diff --git a/src/lib/response_from_fd.c b/src/lib/response_from_fd.c
index 6eac3f7f..ac0a54d1 100644
--- a/src/lib/response_from_fd.c
+++ b/src/lib/response_from_fd.c
@@ -1,6 +1,7 @@
 /*
   This file is part of libmicrohttpd
-  Copyright (C) 2007-2018 Daniel Pittman and Christian Grothoff
+  Copyright (C) 2007-2019 Daniel Pittman, Christian Grothoff and
+  Karlson2k (Evgeny Grin)
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
@@ -28,6 +29,18 @@
 
 
 /**
+ * Size of single file read operation for
+ * file-backed responses.
+ */
+#ifndef MHD_FILE_READ_BLOCK_SIZE
+#ifdef _WIN32
+#define MHD_FILE_READ_BLOCK_SIZE 16384 /* 16k */
+#else /* _WIN32 */
+#define MHD_FILE_READ_BLOCK_SIZE 4096 /* 4k */
+#endif /* _WIN32 */
+#endif /* !MHD_FD_BLOCK_SIZE */
+
+/**
  * Given a file descriptor, read data from the file
  * to generate the response.
  *
@@ -182,7 +195,7 @@ MHD_response_from_fd (enum MHD_HTTP_StatusCode sc,
 
   response = MHD_response_from_callback (sc,
                                          size,
-                                         MHD_FD_BLOCK_SIZE,
+                                         MHD_FILE_READ_BLOCK_SIZE,
                                          &file_reader,
                                          NULL,
                                          &free_callback);