From c37728bbad8f57288b68559da52ad57abb0141ff Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Fri, 20 Feb 2026 12:49:24 +0800
Subject: Revert "packed: Make packWriter implement Write directly instead of
 wrapping"

This reverts commit 50cd7868cf055bce46e1a4253840089dfc602a11.
---
 packed_write_pack.go | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/packed_write_pack.go b/packed_write_pack.go
index 329e2a7f..7e79b2ef 100644
--- a/packed_write_pack.go
+++ b/packed_write_pack.go
@@ -39,16 +39,6 @@ func newPackWriter(w io.Writer, algo hashAlgorithm, objCount uint32) (*packWrite
 	}, nil
 }
 
-func (pw *packWriter) Write(p []byte) (int, error) {
-	if pw == nil || !pw.wroteHeader {
-		return 0, ErrInvalidObject
-	}
-	if err := pw.writePacked(p); err != nil {
-		return 0, err
-	}
-	return len(p), nil
-}
-
 func (pw *packWriter) writePacked(p []byte) error {
 	if len(p) == 0 {
 		return nil
@@ -104,7 +94,7 @@ func (pw *packWriter) WriteObject(ty ObjectType, body []byte) error {
 		return err
 	}
 
-	zw := zlib.NewWriter(pw)
+	zw := zlib.NewWriter(&packHashWriter{pw: pw})
 	if _, err := zw.Write(body); err != nil {
 		_ = zw.Close()
 		return err
@@ -147,7 +137,7 @@ func (pw *packWriter) WriteOfsDelta(baseOffset uint64, baseSize, resultSize int,
 		return err
 	}
 
-	zw := zlib.NewWriter(pw)
+	zw := zlib.NewWriter(&packHashWriter{pw: pw})
 	if _, err := zw.Write(delta); err != nil {
 		_ = zw.Close()
 		return err
@@ -185,7 +175,7 @@ func (pw *packWriter) WriteRefDelta(base Hash, baseSize, resultSize int, delta [
 		return err
 	}
 
-	zw := zlib.NewWriter(pw)
+	zw := zlib.NewWriter(&packHashWriter{pw: pw})
 	if _, err := zw.Write(delta); err != nil {
 		_ = zw.Close()
 		return err
@@ -207,6 +197,20 @@ func (pw *packWriter) Close() (Hash, error) {
 	return out, nil
 }
 
+type packHashWriter struct {
+	pw *packWriter
+}
+
+func (w *packHashWriter) Write(p []byte) (int, error) {
+	if w == nil || w.pw == nil {
+		return 0, ErrInvalidObject
+	}
+	if err := w.pw.writePacked(p); err != nil {
+		return 0, err
+	}
+	return len(p), nil
+}
+
 // packHeaderEncode encodes a pack object header (type + size).
 func packHeaderEncode(ty ObjectType, size int) ([]byte, error) {
 	if size < 0 {
-- 
cgit v1.3.1-10-gc9f91