[#69] object: Initial EC implementation

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

object/types.go

@@ -39,6 +39,15 @@ type SplitHeader struct {
 	splitID []byte
 }
 
+type ECHeader struct {
+	Parent       *refs.ObjectID
+	Index        uint32
+	Total        uint32
+	Header       []byte
+	HeaderLength uint32
+	Signature    []byte
+}
+
 type Header struct {
 	version *refs.Version
 
@@ -59,6 +68,8 @@ type Header struct {
 	attr []Attribute
 
 	split *SplitHeader
+
+	ec *ECHeader
 }
 
 type HeaderWithSignature struct {
@@ -88,6 +99,16 @@ type SplitInfo struct {
 	link *refs.ObjectID
 }
 
+type ECChunk struct {
+	ID    refs.ObjectID
+	Index uint32
+	Total uint32
+}
+
+type ECInfo struct {
+	Chunks []ECChunk
+}
+
 type GetRequestBody struct {
 	addr *refs.Address
 
@@ -655,6 +676,17 @@ func (h *Header) SetSplit(v *SplitHeader) {
 	h.split = v
 }
 
+func (h *Header) GetEC() *ECHeader {
+	if h != nil {
+		return h.ec
+	}
+	return nil
+}
+
+func (h *Header) SetEC(v *ECHeader) {
+	h.ec = v
+}
+
 func (h *HeaderWithSignature) GetHeader() *Header {
 	if h != nil {
 		return h.header