object/store/packed: Add a delta header pool

1 files changed, 10 insertions, 1 deletions

diff --git a/object/store/packed/delta.go b/object/store/packed/delta.go
index c8fe8f75..5b538221 100644
--- a/object/store/packed/delta.go
+++ b/object/store/packed/delta.go
@@ -10,8 +10,14 @@ import (
 	"lindenii.org/go/furgit/internal/format/packfile"
 	"lindenii.org/go/furgit/internal/format/packfile/delta"
 	"lindenii.org/go/lgo/intconv"
+	"lindenii.org/go/lgo/sync"
 )
 
+//nolint:gochecknoglobals
+var deltaHeaderPool = sync.NewPool(func() *[delta.MaxHeaderSizesLen]byte {
+	return new([delta.MaxHeaderSizesLen]byte)
+})
+
 // deltaNode is a delta entry on a resolution chain.
 type deltaNode struct {
 	// payload is the entry's compressed delta payload view.
@@ -214,9 +220,12 @@ func deltaResultSize(payload []byte, deltaSize uint64) (int, error) {
 
 	defer func() { _ = zr.Close() }()
 
+	buf := deltaHeaderPool.Get()
+	defer deltaHeaderPool.Put(buf)
+
 	prefixLen := min(uint64(delta.MaxHeaderSizesLen), deltaSize)
 
-	prefix := make([]byte, prefixLen)
+	prefix := buf[:prefixLen]
 
 	_, err = io.ReadFull(zr, prefix)
 	if err != nil {