Initial commit

Initial public review release v0.10.0

lib/objutil/verifier.go

@@ -0,0 +1,35 @@
+package objutil
+
+import (
+	"bytes"
+	"context"
+
+	"github.com/nspcc-dev/neofs-api-go/object"
+)
+
+// Verifier is an interface for checking whether an object conforms to a certain criterion.
+// Nil error is equivalent to matching the criterion.
+type Verifier interface {
+	Verify(context.Context, *object.Object) error
+}
+
+// MarshalHeaders marshals all object headers which are "higher" than to-th extended header.
+func MarshalHeaders(obj *object.Object, to int) ([]byte, error) {
+	buf := new(bytes.Buffer)
+
+	if sysHdr, err := obj.SystemHeader.Marshal(); err != nil {
+		return nil, err
+	} else if _, err := buf.Write(sysHdr); err != nil {
+		return nil, err
+	}
+
+	for i := range obj.Headers[:to] {
+		if header, err := obj.Headers[i].Marshal(); err != nil {
+			return nil, err
+		} else if _, err := buf.Write(header); err != nil {
+			return nil, err
+		}
+	}
+
+	return buf.Bytes(), nil
+}