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diff --git a/kaldi_io/src/tools/openfst/include/fst/script/register.h b/kaldi_io/src/tools/openfst/include/fst/script/register.h
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+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright 2005-2010 Google, Inc.
+// Author: jpr@google.com (Jake Ratkiewicz)
+
+#ifndef FST_SCRIPT_REGISTER_H_
+#define FST_SCRIPT_REGISTER_H_
+
+#include <string>
+
+#include <fst/generic-register.h>
+#include <fst/script/fst-class.h>
+#include <fst/script/weight-class.h>
+
+// Holds methods and classes responsible for maintaining
+// the register for FstClass arc types.
+
+namespace fst {
+namespace script {
+
+//
+// Registers for reading and converting various kinds of FST classes.
+//
+
+// This class definition is to avoid a nested class definition inside
+// the IORegistration struct.
+template<class Reader, class Creator, class Converter>
+struct FstClassRegEntry {
+  Reader reader;
+  Creator creator;
+  Converter converter;
+
+  FstClassRegEntry(Reader r, Creator cr, Converter co) :
+      reader(r), creator(cr), converter(co) { }
+  FstClassRegEntry() : reader(0), creator(0), converter(0) { }
+};
+
+template<class Reader, class Creator, class Converter>
+class FstClassIORegister
+    : public GenericRegister<string,
+                             FstClassRegEntry<Reader, Creator, Converter>,
+                             FstClassIORegister<Reader, Creator,
+                                                Converter> > {
+ public:
+  Reader GetReader(const string &arc_type) const {
+    return this->GetEntry(arc_type).reader;
+  }
+
+  Creator GetCreator(const string &arc_type) const {
+    return this->GetEntry(arc_type).creator;
+  }
+
+  Converter GetConverter(const string &arc_type) const {
+    return this->GetEntry(arc_type).converter;
+  }
+
+ protected:
+  virtual string ConvertKeyToSoFilename(
+      const string& key) const {
+    string legal_type(key);
+    ConvertToLegalCSymbol(&legal_type);
+
+    return legal_type + "-arc.so";
+  }
+};
+
+//
+// Struct containing everything needed to register a particular type
+// of FST class (e.g. a plain FstClass, or a MutableFstClass, etc)
+//
+template<class FstClassType>
+struct IORegistration {
+  typedef FstClassType *(*Reader)(istream &stream,
+                                  const FstReadOptions &opts);
+
+  typedef FstClassImplBase *(*Creator)();
+  typedef FstClassImplBase *(*Converter)(const FstClass &other);
+
+  typedef FstClassRegEntry<Reader, Creator, Converter> Entry;
+
+  // FST class Register
+  typedef FstClassIORegister<Reader, Creator, Converter> Register;
+
+  // FST class Register-er
+  typedef GenericRegisterer<FstClassIORegister<Reader, Creator, Converter> >
+    Registerer;
+};
+
+
+//
+// REGISTRATION MACROS
+//
+
+#define REGISTER_FST_CLASS(Class, Arc)                                  \
+  static IORegistration<Class>::Registerer Class ## _ ## Arc ## _registerer( \
+      Arc::Type(),                                                      \
+      IORegistration<Class>::Entry(Class::Read<Arc>,                    \
+                                   Class::Create<Arc>,                  \
+                                   Class::Convert<Arc>))
+
+#define REGISTER_FST_CLASSES(Arc)               \
+  REGISTER_FST_CLASS(FstClass, Arc);            \
+  REGISTER_FST_CLASS(MutableFstClass, Arc);     \
+  REGISTER_FST_CLASS(VectorFstClass, Arc);
+
+}  // namespace script
+}  // namespace fst
+
+#endif  // FST_SCRIPT_REGISTER_H_