From 67958f7fa7ae0d9b91fcd6025cda6c6abbecd6da Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Thu, 7 Aug 2014 16:11:00 +0200
Subject: util/{Static,Foreign}FifoBuffer: lazy shift

Reduce the number of unnecessary memmove() calls.
---
 src/util/ForeignFifoBuffer.hxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/util/ForeignFifoBuffer.hxx')

diff --git a/src/util/ForeignFifoBuffer.hxx b/src/util/ForeignFifoBuffer.hxx
index 0ebcd6069..b829fb030 100644
--- a/src/util/ForeignFifoBuffer.hxx
+++ b/src/util/ForeignFifoBuffer.hxx
@@ -147,7 +147,11 @@ public:
 	 * When you are finished, call append().
 	 */
 	Range Write() {
-		Shift();
+		if (IsEmpty())
+			Clear();
+		else if (tail == capacity)
+			Shift();
+
 		return Range(data + tail, capacity - tail);
 	}
 
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