object/signature: Append

2 files changed, 32 insertions, 33 deletions

diff --git a/object/signature/append.go b/object/signature/append.go
new file mode 100644
index 00000000..3db52752
--- /dev/null
+++ b/object/signature/append.go
@@ -0,0 +1,32 @@
+package signature
+
+import (
+	"fmt"
+	"strconv"
+	"slices"
+)
+
+// Bytes renders the signature in canonical Git format.
+func (signature Signature) AppendTo(dst []byte) ([]byte) {
+	slices.Grow(dst, len(signature.Name) + len(signature.Email) + 32)
+	dst = append(dst, signature.Name...)
+	dst = append(dst, ' ', '<')
+	dst = append(dst, signature.Email...)
+	dst = append(dst, '>', ' ')
+	strconv.AppendInt(dst, signature.WhenUnix, 10)
+	dst = append(dst, ' ')
+
+	offset := signature.OffsetMinutes
+
+	sign := '+'
+	if offset < 0 {
+		sign = '-'
+		offset = -offset
+	}
+
+	hh := offset / 60
+	mm := offset % 60
+	dst = fmt.Appendf(dst, "%c%02d%02d", sign, hh, mm)
+
+	return dst
+}
diff --git a/object/signature/bytes.go b/object/signature/bytes.go
deleted file mode 100644
index 0afff5e0..00000000
--- a/object/signature/bytes.go
+++ /dev/null
@@ -1,33 +0,0 @@
-package signature
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-// Bytes renders the signature in canonical Git format.
-func (signature Signature) Bytes() ([]byte, error) {
-	var b strings.Builder
-	b.Grow(len(signature.Name) + len(signature.Email) + 32)
-	b.Write(signature.Name)
-	b.WriteString(" <")
-	b.Write(signature.Email)
-	b.WriteString("> ")
-	b.WriteString(strconv.FormatInt(signature.WhenUnix, 10))
-	b.WriteByte(' ')
-
-	offset := signature.OffsetMinutes
-
-	sign := '+'
-	if offset < 0 {
-		sign = '-'
-		offset = -offset
-	}
-
-	hh := offset / 60
-	mm := offset % 60
-	fmt.Fprintf(&b, "%c%02d%02d", sign, hh, mm)
-
-	return []byte(b.String()), nil
-}