Add Inner Ring code

pkg/core/netmap/node/status.go

@@ -0,0 +1,63 @@
+package node
+
+// Status represents a node
+// status bits.
+type Status uint64
+
+const leftBitPos = 64
+
+const (
+	bitFullStorage = 1
+)
+
+// returns true if n-th left bit is set (starting at 0).
+func isLeftBitSet(value Status, n uint8) bool {
+	bitMask := Status(1 << (leftBitPos - n))
+	return bitMask != 0 && value&bitMask == bitMask
+}
+
+// sets n-th left bit (starting at 0).
+func setLeftBit(value *Status, n uint8) {
+	*value |= Status(1 << (leftBitPos - n))
+}
+
+// resets n-th left bit (starting at 0).
+func resetLeftBit(value *Status, n uint8) {
+	*value &= ^Status(1 << (leftBitPos - n))
+}
+
+// Full returns true if node is in Full status.
+//
+// Full status marks node has enough space
+// for storing users objects.
+func (n Status) Full() bool {
+	return isLeftBitSet(n, bitFullStorage)
+}
+
+// SetFull sets Full status of node.
+func (n *Status) SetFull() {
+	setLeftBit(n, bitFullStorage)
+}
+
+// ResetFull resets Full status of node.
+func (n *Status) ResetFull() {
+	resetLeftBit(n, bitFullStorage)
+}
+
+// StatusFromUint64 converts builtin
+// uint64 value to Status.
+//
+// Try to avoid direct cast for
+// better portability.
+func StatusFromUint64(v uint64) Status {
+	return Status(v)
+}
+
+// StatusToUint64 converts Status value
+// to builtin uint64.
+//
+// Try to avoid direct cast for
+// better portability.
+func StatusToUint64(s Status) uint64 {
+	return uint64(s)
+}