From cdfbe6dcf2b361e4c93c2703c2f8c9bddeac0ee6 Mon Sep 17 00:00:00 2001
From: foxxorcat <95907542+foxxorcat@users.noreply.github.com>
Date: Wed, 18 Oct 2023 16:27:07 +0800
Subject: [PATCH] fix: hash gcid empty file (#5394)

---
 pkg/utils/hash/gcid.go | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/pkg/utils/hash/gcid.go b/pkg/utils/hash/gcid.go
index 8e1b98d6..f6eccef7 100644
--- a/pkg/utils/hash/gcid.go
+++ b/pkg/utils/hash/gcid.go
@@ -72,11 +72,13 @@ func (h *gcid) Write(p []byte) (n int, err error) {
 }
 
 func (h *gcid) Sum(b []byte) []byte {
-	if hashm, ok := h.hash.(encoding.BinaryMarshaler); ok {
-		if hashum, ok := h.hash.(encoding.BinaryUnmarshaler); ok {
-			tempData, _ := hashm.MarshalBinary()
-			h.hash.Write(h.hashState.Sum(nil))
-			defer hashum.UnmarshalBinary(tempData)
+	if h.offset != 0 {
+		if hashm, ok := h.hash.(encoding.BinaryMarshaler); ok {
+			if hashum, ok := h.hash.(encoding.BinaryUnmarshaler); ok {
+				tempData, _ := hashm.MarshalBinary()
+				defer hashum.UnmarshalBinary(tempData)
+				h.hash.Write(h.hashState.Sum(nil))
+			}
 		}
 	}
 	return h.hash.Sum(b)