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/invocation.go

@@ -0,0 +1,61 @@
+package transaction
+
+import (
+	"errors"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/payload/transaction/types"
+	"github.com/CityOfZion/neo-go/pkg/wire/payload/transaction/version"
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+	"github.com/CityOfZion/neo-go/pkg/wire/util/fixed8"
+)
+
+//Invocation represents an invocation transaction on the neo network
+type Invocation struct {
+	*Base
+	Script []byte
+	Gas    fixed8.Fixed8
+}
+
+//NewInvocation returns an invocation transaction
+func NewInvocation(ver version.TX) *Invocation {
+	basicTrans := createBaseTransaction(types.Invocation, ver)
+
+	invocation := &Invocation{}
+	invocation.Base = basicTrans
+	invocation.encodeExclusive = invocation.encodeExcl
+	invocation.decodeExclusive = invocation.decodeExcl
+	return invocation
+}
+
+func (c *Invocation) encodeExcl(bw *util.BinWriter) {
+	bw.VarUint(uint64(len(c.Script)))
+	bw.Write(c.Script)
+
+	switch c.Version {
+	case 0:
+		c.Gas = fixed8.Fixed8(0)
+	case 1:
+		bw.Write(&c.Gas)
+	default:
+		bw.Write(&c.Gas)
+	}
+
+	return
+}
+
+func (c *Invocation) decodeExcl(br *util.BinReader) {
+
+	lenScript := br.VarUint()
+	c.Script = make([]byte, lenScript)
+	br.Read(&c.Script)
+
+	switch c.Version {
+	case 0:
+		c.Gas = fixed8.Fixed8(0)
+	case 1:
+		br.Read(&c.Gas)
+	default:
+		br.Err = errors.New("invalid Version Number for Invocation Transaction")
+	}
+	return
+}