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pkg/tarsum: avoid buf2 allocation in Read

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Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
This commit is contained in:
unclejack 2014-08-17 14:29:46 +03:00
parent d1fc32e265
commit 55533693be
1 changed files with 7 additions and 1 deletions
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8
pkg/tarsum/tarsum.go
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@ -23,6 +23,7 @@ type TarSum struct {
gz writeCloseFlusher gz writeCloseFlusher
bufTar *bytes.Buffer bufTar *bytes.Buffer
bufGz *bytes.Buffer bufGz *bytes.Buffer
bufData [8192]byte
h hash.Hash h hash.Hash
sums map[string]string sums map[string]string
currentFile string currentFile string
@ -92,7 +93,12 @@ func (ts *TarSum) Read(buf []byte) (int, error) {
if ts.finished { if ts.finished {
return ts.bufGz.Read(buf) return ts.bufGz.Read(buf)
} }
buf2 := make([]byte, len(buf), cap(buf)) var buf2 []byte
if len(buf) > 8192 {
buf2 = make([]byte, len(buf), cap(buf))
} else {
buf2 = ts.bufData[:len(buf)-1]
}
n, err := ts.tarR.Read(buf2) n, err := ts.tarR.Read(buf2)
if err != nil { if err != nil {