1 files changed, 68 insertions, 0 deletions
diff --git a/object/tag/serialize.go b/object/tag/serialize.go
new file mode 100644
index 00000000..5f712950
--- /dev/null
+++ b/object/tag/serialize.go
@@ -0,0 +1,68 @@
+package tag
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+
+	objectheader "codeberg.org/lindenii/furgit/object/header"
+	objecttype "codeberg.org/lindenii/furgit/object/type"
+)
+
+// SerializeWithoutHeader renders the raw tag body bytes.
+func (tag *Tag) SerializeWithoutHeader() ([]byte, error) {
+	if tag.Target.Size() == 0 {
+		return nil, errors.New("object: tag: missing target id")
+	}
+
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "object %s\n", tag.Target.String())
+
+	tyName, ok := objecttype.Name(tag.TargetType)
+	if !ok {
+		return nil, fmt.Errorf("object: tag: invalid target type %d", tag.TargetType)
+	}
+
+	buf.WriteString("type ")
+	buf.WriteString(tyName)
+	buf.WriteByte('\n')
+
+	buf.WriteString("tag ")
+	buf.Write(tag.Name)
+	buf.WriteByte('\n')
+
+	if tag.Tagger != nil {
+		taggerBytes, err := tag.Tagger.Serialize()
+		if err != nil {
+			return nil, err
+		}
+
+		buf.WriteString("tagger ")
+		buf.Write(taggerBytes)
+		buf.WriteByte('\n')
+	}
+
+	buf.WriteByte('\n')
+	buf.Write(tag.Message)
+
+	return buf.Bytes(), nil
+}
+
+// SerializeWithHeader renders the raw object (header + body).
+func (tag *Tag) SerializeWithHeader() ([]byte, error) {
+	body, err := tag.SerializeWithoutHeader()
+	if err != nil {
+		return nil, err
+	}
+
+	header, ok := objectheader.Encode(objecttype.TypeTag, int64(len(body)))
+	if !ok {
+		return nil, errors.New("object: tag: failed to encode object header")
+	}
+
+	raw := make([]byte, len(header)+len(body))
+	copy(raw, header)
+	copy(raw[len(header):], body)
+
+	return raw, nil
+}