pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/payload/transaction/statedescriptor.go

@@ -0,0 +1,55 @@
+package transaction
+
+import (
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+)
+
+// DescStateType represents the type of StateDescriptor.
+type DescStateType uint8
+
+// Valid DescStateType constants.
+const (
+	Account   DescStateType = 0x40
+	Validator DescStateType = 0x48
+)
+
+// StateDescriptor represents a state descriptor on the neo network
+// used in a state transaction
+type StateDescriptor struct {
+	Type  DescStateType
+	Key   []byte
+	Value []byte
+	Field string
+}
+
+// Decode decodes a binary reader into a state descriptor
+func (s *StateDescriptor) Decode(br *util.BinReader) {
+	br.Read(&s.Type)
+
+	keyLen := br.VarUint()
+	s.Key = make([]byte, keyLen)
+	br.Read(s.Key)
+
+	valLen := br.VarUint()
+	s.Value = make([]byte, valLen)
+	br.Read(s.Value)
+
+	fieldLen := br.VarUint()
+	field := make([]byte, fieldLen)
+	br.Read(field)
+
+	s.Field = string(field)
+}
+
+//Encode encodes a state descriptor into a binary writer
+func (s *StateDescriptor) Encode(bw *util.BinWriter) {
+	bw.Write(s.Type)
+
+	bw.VarUint(uint64(len(s.Key)))
+	bw.Write(s.Key)
+
+	bw.VarUint(uint64(len(s.Value)))
+	bw.Write(s.Value)
+
+	bw.VarString(s.Field)
+}