From b0e871876a585bdab21af192f333d5be92eeb04b Mon Sep 17 00:00:00 2001
From: Menno Finlay-Smits <inbox@menno.io>
Date: Tue, 14 Nov 2017 11:50:00 +1300
Subject: [PATCH] pkg/escape: Preallocate output in Unescape

Preallocating the capacity of the output is faster and uses less
memory than letting append() do its own (over)allocation.
---
 pkg/escape/bytes.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkg/escape/bytes.go b/pkg/escape/bytes.go
index ac7ed5ab38..f3b31f42d3 100644
--- a/pkg/escape/bytes.go
+++ b/pkg/escape/bytes.go
@@ -78,7 +78,11 @@ func Unescape(in []byte) []byte {
 
 	i := 0
 	inLen := len(in)
-	var out []byte
+
+	// The output size will be no more than inLen. Preallocating the
+	// capacity of the output is faster and uses less memory than
+	// letting append() do its own (over)allocation.
+	out := make([]byte, 0, inLen)
 
 	for {
 		if i >= inLen {