added preload and streaming buffer pool

pkg/fs/pool.go

@@ -0,0 +1,27 @@
+// Copyright (C) 2022 Marius Schellenberger
+
+package fs
+
+import (
+	"sync"
+)
+
+type pool[T any] struct {
+	p sync.Pool
+}
+
+func newPool[T any](newf func() T) *pool[T] {
+	return &pool[T]{
+		p: sync.Pool{
+			New: func() any { return newf() },
+		},
+	}
+}
+
+func (p *pool[T]) Get() T {
+	return p.p.Get().(T)
+}
+
+func (p *pool[T]) Put(v T) {
+	p.p.Put(v)
+}