fix #18: support upper case extension

algo/common/dispatch.go

@@ -1,5 +1,10 @@
 package common
 
+import (
+	"path/filepath"
+	"strings"
+)
+
 type NewDecoderFunc func([]byte) Decoder
 
 var decoderRegistry = make(map[string][]NewDecoderFunc)
@@ -7,6 +12,7 @@ var decoderRegistry = make(map[string][]NewDecoderFunc)
 func RegisterDecoder(ext string, dispatchFunc NewDecoderFunc) {
 	decoderRegistry[ext] = append(decoderRegistry[ext], dispatchFunc)
 }
-func GetDecoder(ext string) []NewDecoderFunc {
+func GetDecoder(filename string) []NewDecoderFunc {
+	ext := strings.ToLower(strings.TrimLeft(filepath.Ext(filename), "."))
 	return decoderRegistry[ext]
 }