return 0, err
		}

		d.partDecRelOffset += int64(n1)
	}
	return len(p), nil
}

// DecryptedSize returns the size of the object after decryption in bytes.
// It returns an error if the object is not encrypted or marked as encrypted
// but has an invalid size.
func (o ObjectInfo) DecryptedSize() (int64, error) {
	if _, ok := crypto.IsEncrypted(o.UserDefined); !ok {