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archive/tar: preallocate slice from paxHeaders 

Preallocate keys slice with the length of paxHeaders map
to prevent slice growth with append operations.

Change-Id: Ic9a927c4eaa775690a4ef912d61dd06f38e11510
Reviewed-on: https://go-review.googlesource.com/23782
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Gyu-Ho Lee 2016-06-04 23:08:19 -07:00 committed by Joe Tsai
parent 2cb471e40d
commit 77e68ea78a
1 changed files with 1 additions and 1 deletions
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2
src/archive/tar/writer.go
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@ -317,7 +317,7 @@ func (tw *Writer) writePAXHeader(hdr *Header, paxHeaders map[string]string) erro
var buf bytes.Buffer
// Keys are sorted before writing to body to allow deterministic output.
var keys []string
keys := make([]string, 0, len(paxHeaders))
for k := range paxHeaders {
keys = append(keys, k)
}