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/mgetheaders.go

@@ -0,0 +1,61 @@
+package payload
+
+import (
+	"io"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/command"
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+)
+
+//GetHeadersMessage represents a GetHeaders message on the neo-network
+type GetHeadersMessage struct {
+	cmd       command.Type
+	hashStart []util.Uint256
+	hashStop  util.Uint256
+}
+
+// NewGetHeadersMessage returns a NewGetHeaders object
+// Start contains the list of all headers you want to fetch
+// End contains the list of the highest header hash you would like to fetch
+func NewGetHeadersMessage(start []util.Uint256, stop util.Uint256) (*GetHeadersMessage, error) {
+	getHeaders := &GetHeadersMessage{command.GetHeaders, start, stop}
+
+	return getHeaders, nil
+
+}
+
+func newAbstractGetHeaders(start []util.Uint256, stop util.Uint256, cmd command.Type) (*GetHeadersMessage, error) {
+	getHeaders, err := NewGetHeadersMessage(start, stop)
+
+	if err != nil {
+		return nil, err
+	}
+	getHeaders.cmd = cmd
+	return getHeaders, nil
+}
+
+// DecodePayload Implements Messager interface
+func (v *GetHeadersMessage) DecodePayload(r io.Reader) error {
+
+	br := util.BinReader{R: r}
+	lenStart := br.VarUint()
+	v.hashStart = make([]util.Uint256, lenStart)
+	br.Read(&v.hashStart)
+	br.Read(&v.hashStop)
+
+	return br.Err
+}
+
+// EncodePayload  Implements messager interface
+func (v *GetHeadersMessage) EncodePayload(w io.Writer) error {
+	bw := &util.BinWriter{W: w}
+	bw.VarUint(uint64(len(v.hashStart)))
+	bw.Write(v.hashStart)
+	bw.Write(v.hashStop)
+	return bw.Err
+}
+
+// Command Implements messager interface
+func (v *GetHeadersMessage) Command() command.Type {
+	return v.cmd
+}