From 731a5c51040042a0f344752fee1117701efa3cfd Mon Sep 17 00:00:00 2001
From: Remi Collet <remi@php.net>
Date: Tue, 2 Apr 2013 16:31:36 +0200
Subject: [PATCH] keep previous test to avoid any behavior change

---
 main/streams/streams.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/main/streams/streams.c b/main/streams/streams.c
index 7bc4c9ddb56..cb80e9a16b5 100644
--- a/main/streams/streams.c
+++ b/main/streams/streams.c
@@ -1535,8 +1535,10 @@ PHPAPI int _php_stream_copy_to_stream_ex(php_stream *src, php_stream *dest, size
 
 			*len = didwrite;
 
-			/* read bytes match written */
-			if (mapped == didwrite) {
+			/* we've got at least 1 byte to read
+			 * less than 1 is an error
+			 * AND read bytes match written */
+			if (mapped > 0 && mapped == didwrite) {
 				return SUCCESS;
 			}
 			return FAILURE;