netmap: Add EC statement to placement policy

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

@@ -11,6 +11,7 @@ const (
 	TypeTombstone
 	_
 	TypeLock
+	TypeECChunk

@@ -665,0 +682,4 @@
+		case parser.IEcStmtContext:
+			res, ok = r.Accept(p).(*netmap.Replica)
+		default:
+			continue

@@ -913,1 +958,4 @@
 		}
+		hasEC = hasEC || p.replicas[i].GetECDataCount() != 0 || p.replicas[i].GetECParityCount() != 0
+	}
+	if hasEC && !p.unique {

@@ -0,0 +42,4 @@
+	headerLength := 0
+	for i := range parts {
+		if parts[i] == nil {
+			continue

@@ -0,0 +65,4 @@
+func (c *Constructor) fillPayload(parts []*objectSDK.Object) {
+	shards := make([][]byte, len(parts))
+	for i := range parts {
+		if parts[i] == nil {

@@ -0,0 +5,4 @@
+// 	"crypto/ecdsa"
+
+// 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+// 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/transformer"

@@ -58,0 +73,4 @@
+		var err error
+		enc, err = erasurecode.NewConstructor(int(p.ECParams.DataCount), int(p.ECParams.ParityCount))
+		if err != nil {
+			panic(fmt.Errorf("FIXME: %v", err))

@@ -0,0 +31,4 @@
+
+// WriteObject implements the transformer.ObjectWriter interface.
+func (t *Target) WriteObject(ctx context.Context, obj *objectSDK.Object) error {
+	t.c.clear()

@@ -0,0 +12,4 @@
+	c.clear()
+
+	var headerLength int
+	for i := range parts {

@@ -0,0 +84,4 @@
+// If headerLength is not zero it is asserted to be equal in the ec header.
+// Otherwise, new headerLength is returned.
+func validatePart(parts []*objectSDK.Object, i int, headerLength int) (int, error) {
+	ec := parts[i].GetECHeader()

@@ -0,0 +15,4 @@
+		return nil, err
+	}
+
+	headerShards, err := c.encodeRaw(header)