update field

internal/buffer/buffer.go

@@ -0,0 +1,42 @@
+package buffer
+
+import "sync"
+
+const bufferSize = 1024
+
+type Buffer []byte
+
+// Having an initial size gives a dramatic speedup.
+//
+//nolint:gochecknoglobals
+var bufPool = sync.Pool{
+	New: func() any {
+		b := make([]byte, 0, bufferSize)
+
+		return (*Buffer)(&b)
+	},
+}
+
+//nolint:forcetypeassert
+func New() *Buffer {
+	return bufPool.Get().(*Buffer)
+}
+
+func (b *Buffer) Free() {
+	// To reduce peak allocation, return only smaller buffers to the pool.
+	const maxBufferSize = 16 << 10
+	if cap(*b) <= maxBufferSize {
+		*b = (*b)[:0]
+		bufPool.Put(b)
+	}
+}
+
+func (b *Buffer) WriteString(s string) (int, error) {
+	*b = append(*b, s...)
+
+	return len(s), nil
+}
+
+func (b *Buffer) String() string {
+	return string(*b)
+}