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/base.go

@@ -0,0 +1,42 @@
+package wire
+
+import (
+	"io"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/command"
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+)
+
+// Base is everything in the message except the payload
+type Base struct {
+	Magic         uint32
+	CMD           command.Type
+	PayloadLength uint32
+	Checksum      uint32
+}
+
+// DecodeBase will decode an io.Reader into a Base object
+// Note, That there is no EncodeBase, As the header is implicitly inferred from the message on Encode To send
+func (h *Base) DecodeBase(r io.Reader) (io.Reader, error) {
+	br := &util.BinReader{R: r}
+
+	br.Read(&h.Magic)
+
+	var cmd [12]byte
+	br.Read(&cmd)
+	h.CMD = command.Type(cmdByteArrayToString(cmd))
+
+	br.Read(&h.PayloadLength)
+	br.Read(&h.Checksum)
+	return br.R, br.Err
+}
+
+func cmdByteArrayToString(cmd [command.Size]byte) string {
+	buf := []byte{}
+	for i := 0; i < command.Size; i++ {
+		if cmd[i] != 0 {
+			buf = append(buf, cmd[i])
+		}
+	}
+	return string(buf)
+}