From 4aba9148ce73c816649e1319476f9eb1131c48aa Mon Sep 17 00:00:00 2001
From: qydysky <qydysky@foxmail.com>
Date: Thu, 14 Nov 2024 22:15:16 +0800
Subject: [PATCH] 1

---
 file/FileWR.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/file/FileWR.go b/file/FileWR.go
index 3a639f2..d0d54ea 100644
--- a/file/FileWR.go
+++ b/file/FileWR.go
@@ -31,6 +31,7 @@ type File struct {
 	file   *os.File
 	wr     io.Writer
 	rr     io.Reader
+	sr     io.Seeker
 	l      sync.RWMutex
 }
 
@@ -245,6 +246,20 @@ func (t *File) Read(data []byte) (int, error) {
 	return t.read().Read(data)
 }
 
+func (t *File) Seek(offset int64, whence int) (int64, error) {
+	t.getRWCloser()
+	if t.Config.AutoClose {
+		defer t.Close()
+	}
+
+	if !t.l.TryRLock() {
+		return 0, ErrFailToLock
+	}
+	defer t.l.RUnlock()
+
+	return t.seek().Seek(offset, whence)
+}
+
 // stop after untilBytes
 //
 // data not include untilBytes
@@ -705,3 +720,13 @@ func (t *File) read() io.Reader {
 	}
 	return t.rr
 }
+
+func (t *File) seek() io.Seeker {
+	if t.Config.AutoClose || t.rr == nil {
+		t.sr = io.Seeker(t.file)
+		if t.Config.Coder != nil {
+			panic("no support")
+		}
+	}
+	return t.sr
+}
-- 
2.39.2