core: move System.Binary.* interops to binary/ package

Also extend test suite.

pkg/core/interop/binary/encode.go

@@ -0,0 +1,57 @@
+package binary
+
+import (
+	"encoding/base64"
+
+	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/core/interop"
+	"github.com/nspcc-dev/neo-go/pkg/vm"
+)
+
+// Serialize serializes top stack item into a ByteArray.
+func Serialize(ic *interop.Context) error {
+	return vm.RuntimeSerialize(ic.VM)
+}
+
+// Deserialize deserializes ByteArray from a stack into an item.
+func Deserialize(ic *interop.Context) error {
+	return vm.RuntimeDeserialize(ic.VM)
+}
+
+// EncodeBase64 encodes top stack item into a base64 string.
+func EncodeBase64(ic *interop.Context) error {
+	src := ic.VM.Estack().Pop().Bytes()
+	result := base64.StdEncoding.EncodeToString(src)
+	ic.VM.Estack().PushVal([]byte(result))
+	return nil
+}
+
+// DecodeBase64 decodes top stack item from base64 string to byte array.
+func DecodeBase64(ic *interop.Context) error {
+	src := ic.VM.Estack().Pop().String()
+	result, err := base64.StdEncoding.DecodeString(src)
+	if err != nil {
+		return err
+	}
+	ic.VM.Estack().PushVal(result)
+	return nil
+}
+
+// EncodeBase58 encodes top stack item into a base58 string.
+func EncodeBase58(ic *interop.Context) error {
+	src := ic.VM.Estack().Pop().Bytes()
+	result := base58.Encode(src)
+	ic.VM.Estack().PushVal([]byte(result))
+	return nil
+}
+
+// DecodeBase58 decodes top stack item from base58 string to byte array.
+func DecodeBase58(ic *interop.Context) error {
+	src := ic.VM.Estack().Pop().String()
+	result, err := base58.Decode(src)
+	if err != nil {
+		return err
+	}
+	ic.VM.Estack().PushVal(result)
+	return nil
+}