diff --git a/lib/file/file.go b/lib/file/file.go
index 7b643817..d502de7d 100644
--- a/lib/file/file.go
+++ b/lib/file/file.go
@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"os"
 	"time"
 
 	"ems.agt/lib/dborm"
@@ -118,3 +119,54 @@ func GetFile(w http.ResponseWriter, r *http.Request) {
 	response := Response{mmlResult}
 	services.ResponseWithJson(w, http.StatusOK, response)
 }
+
+// 格式文件大小单位
+func FormatFileSize(fileSize float64) (size string) {
+	if fileSize < 1024 {
+		return fmt.Sprintf("%.2fB", fileSize/float64(1))
+	} else if fileSize < (1024 * 1024) {
+		return fmt.Sprintf("%.2fKB", fileSize/float64(1024))
+	} else if fileSize < (1024 * 1024 * 1024) {
+		return fmt.Sprintf("%.2fMB", fileSize/float64(1024*1024))
+	} else if fileSize < (1024 * 1024 * 1024 * 1024) {
+		return fmt.Sprintf("%.2fGB", fileSize/float64(1024*1024*1024))
+	} else if fileSize < (1024 * 1024 * 1024 * 1024 * 1024) {
+		return fmt.Sprintf("%.2fTB", fileSize/float64(1024*1024*1024*1024))
+	} else {
+		return fmt.Sprintf("%.2fEB", fileSize/float64(1024*1024*1024*1024*1024))
+	}
+}
+
+func IsSymlink(mode os.FileMode) bool {
+	return mode&os.ModeSymlink != 0
+}
+
+const dotCharacter = 46
+
+func IsHidden(path string) bool {
+	return path[0] == dotCharacter
+}
+
+func GetMimeType(path string) string {
+	file, err := os.Open(path)
+	if err != nil {
+		return ""
+	}
+	defer file.Close()
+
+	buffer := make([]byte, 512)
+	_, err = file.Read(buffer)
+	if err != nil {
+		return ""
+	}
+	mimeType := http.DetectContentType(buffer)
+	return mimeType
+}
+
+func GetSymlink(path string) string {
+	linkPath, err := os.Readlink(path)
+	if err != nil {
+		return ""
+	}
+	return linkPath
+}