From 4a461d214e1a0ea6361516da36b30328ced1917c Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sat, 7 Mar 2026 14:23:34 +0800
Subject: objectid: Add Zero

---
 objectid/objectid.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'objectid')

diff --git a/objectid/objectid.go b/objectid/objectid.go
index 1c169b29..8eb82969 100644
--- a/objectid/objectid.go
+++ b/objectid/objectid.go
@@ -59,6 +59,16 @@ func Compare(left, right ObjectID) int {
 	return bytes.Compare(left.RawBytes(), right.RawBytes())
 }
 
+// Zero returns the all-zero object ID for the specified algorithm.
+func Zero(algo Algorithm) ObjectID {
+	id, err := FromBytes(algo, make([]byte, algo.Size()))
+	if err != nil {
+		panic(err)
+	}
+
+	return id
+}
+
 // ParseHex parses an object ID from hex for the specified algorithm.
 func ParseHex(algo Algorithm, s string) (ObjectID, error) {
 	var id ObjectID
-- 
cgit v1.3.1-10-gc9f91