// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  //
  // Definitions and functions for invoking and using Far main functions that
  // support multiple and extensible arc types.
  
  #include <fst/extensions/far/script-impl.h>
  
  #include <string>
  
  #include <fst/extensions/far/far.h>
  #include <fstream>
  
  namespace fst {
  namespace script {
  
  string LoadArcTypeFromFar(const string &far_fname) {
    FarHeader hdr;
    if (!hdr.Read(far_fname)) {
      LOG(ERROR) << "Error reading FAR: " << far_fname;
      return "";
    }
    string atype = hdr.ArcType();
    if (atype == "unknown") {
      LOG(ERROR) << "Empty FST archive: " << far_fname;
      return "";
    }
    return atype;
  }
  
  string LoadArcTypeFromFst(const string &fst_fname) {
    FstHeader hdr;
    std::ifstream in(fst_fname, std::ios_base::in | std::ios_base::binary);
    if (!hdr.Read(in, fst_fname)) {
      LOG(ERROR) << "Error reading FST: " << fst_fname;
      return "";
    }
    return hdr.ArcType();
  }
  
  }  // namespace script
  }  // namespace fst