Refactor platform command api

experimental/libbox/setup.go

@@ -1,6 +1,10 @@
 package libbox
 
-import C "github.com/sagernet/sing-box/constant"
+import (
+	C "github.com/sagernet/sing-box/constant"
+
+	"github.com/dustin/go-humanize"
+)
 
 func SetBasePath(path string) {
 	C.SetBasePath(path)
@@ -9,3 +13,7 @@ func SetBasePath(path string) {
 func Version() string {
 	return C.Version
 }
+
+func FormatBytes(length int64) string {
+	return humanize.Bytes(uint64(length))
+}