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diff --git a/kaldi_io/src/tools/openfst/include/fst/verify.h b/kaldi_io/src/tools/openfst/include/fst/verify.h
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+// verify.h
+
+// 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: [email protected] (Michael Riley)
+//
+// \file
+// Function to verify an Fst's contents
+
+#ifndef FST_LIB_VERIFY_H__
+#define FST_LIB_VERIFY_H__
+
+#include <fst/fst.h>
+#include <fst/test-properties.h>
+
+
+namespace fst {
+
+// Verifies that an Fst's contents are sane.
+template<class Arc>
+bool Verify(const Fst<Arc> &fst, bool allow_negative_labels = false) {
+ typedef typename Arc::Label Label;
+ typedef typename Arc::Weight Weight;
+ typedef typename Arc::StateId StateId;
+
+ StateId start = fst.Start();
+ const SymbolTable *isyms = fst.InputSymbols();
+ const SymbolTable *osyms = fst.OutputSymbols();
+
+ // Count states
+ StateId ns = 0;
+ for (StateIterator< Fst<Arc> > siter(fst);
+ !siter.Done();
+ siter.Next())
+ ++ns;
+
+ if (start == kNoStateId && ns > 0) {
+ LOG(ERROR) << "Verify: Fst start state ID unset";
+ return false;
+ } else if (start >= ns) {
+ LOG(ERROR) << "Verify: Fst start state ID exceeds number of states";
+ return false;
+ }
+
+ for (StateIterator< Fst<Arc> > siter(fst);
+ !siter.Done();
+ siter.Next()) {
+ StateId s = siter.Value();
+ size_t na = 0;
+ for (ArcIterator< Fst<Arc> > aiter(fst, s);
+ !aiter.Done();
+ aiter.Next()) {
+ const Arc &arc =aiter.Value();
+ if (!allow_negative_labels && arc.ilabel < 0) {
+ LOG(ERROR) << "Verify: Fst input label ID of arc at position "
+ << na << " of state " << s << " is negative";
+ return false;
+ } else if (isyms && isyms->Find(arc.ilabel) == "") {
+ LOG(ERROR) << "Verify: Fst input label ID " << arc.ilabel
+ << " of arc at position " << na << " of state " << s
+ << " is missing from input symbol table \""
+ << isyms->Name() << "\"";
+ return false;
+ } else if (!allow_negative_labels && arc.olabel < 0) {
+ LOG(ERROR) << "Verify: Fst output label ID of arc at position "
+ << na << " of state " << s << " is negative";
+ return false;
+ } else if (osyms && osyms->Find(arc.olabel) == "") {
+ LOG(ERROR) << "Verify: Fst output label ID " << arc.olabel
+ << " of arc at position " << na << " of state " << s
+ << " is missing from output symbol table \""
+ << osyms->Name() << "\"";
+ return false;
+ } else if (!arc.weight.Member() || arc.weight == Weight::Zero()) {
+ LOG(ERROR) << "Verify: Fst weight of arc at position "
+ << na << " of state " << s << " is invalid";
+ return false;
+ } else if (arc.nextstate < 0) {
+ LOG(ERROR) << "Verify: Fst destination state ID of arc at position "
+ << na << " of state " << s << " is negative";
+ return false;
+ } else if (arc.nextstate >= ns) {
+ LOG(ERROR) << "Verify: Fst destination state ID of arc at position "
+ << na << " of state " << s
+ << " exceeds number of states";
+ return false;
+ }
+ ++na;
+ }
+ if (!fst.Final(s).Member()) {
+ LOG(ERROR) << "Verify: Fst final weight of state " << s << " is invalid";
+ return false;
+ }
+ }
+ uint64 fst_props = fst.Properties(kFstProperties, false);
+ if (fst_props & kError) {
+ LOG(ERROR) << "Verify: Fst error property is set";
+ return false;
+ }
+
+ uint64 known_props;
+ uint64 test_props = ComputeProperties(fst, kFstProperties, &known_props,
+ false);
+ if (!CompatProperties(fst_props, test_props)) {
+ LOG(ERROR) << "Verify: stored Fst properties incorrect "
+ << "(props1 = stored props, props2 = tested)";
+ return false;
+ } else {
+ return true;
+ }
+}
+
+} // namespace fst
+
+#endif // FST_LIB_VERIFY_H__