Add Decoder Registry

Add Raw Decoder

algo/common/dispatch.go

@@ -0,0 +1,12 @@
+package common
+
+type NewDecoderFunc func([]byte) Decoder
+
+var decoderRegistry = make(map[string][]NewDecoderFunc)
+
+func RegisterDecoder(ext string, dispatchFunc NewDecoderFunc) {
+	decoderRegistry[ext] = append(decoderRegistry[ext], dispatchFunc)
+}
+func GetDecoder(ext string) []NewDecoderFunc {
+	return decoderRegistry[ext]
+}