add implementation for kaldi io (by ymz)

1 files changed, 306 insertions, 0 deletions

diff --git a/kaldi_io/src/tools/openfst/include/fst/add-on.h b/kaldi_io/src/tools/openfst/include/fst/add-on.h
new file mode 100644
index 0000000..ee21a93
--- /dev/null
+++ b/kaldi_io/src/tools/openfst/include/fst/add-on.h
@@ -0,0 +1,306 @@
+// add-on.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
+// Fst implementation class to attach an arbitrary object with a
+// read/write method to an FST and its file rep. The FST is given a
+// new type name.
+
+#ifndef FST_LIB_ADD_ON_FST_H__
+#define FST_LIB_ADD_ON_FST_H__
+
+#include <stddef.h>
+#include <string>
+
+#include <fst/fst.h>
+
+
+namespace fst {
+
+// Identifies stream data as an add-on fst.
+static const int32 kAddOnMagicNumber = 446681434;
+
+
+//
+// Some useful add-on objects.
+//
+
+// Nothing to save.
+class NullAddOn {
+ public:
+  NullAddOn() {}
+
+  static NullAddOn *Read(istream &istrm) {
+    return new NullAddOn();
+  };
+
+  bool Write(ostream &ostrm) const { return true; }
+
+  int RefCount() const { return ref_count_.count(); }
+  int IncrRefCount() { return ref_count_.Incr(); }
+  int DecrRefCount() { return ref_count_.Decr(); }
+
+ private:
+  RefCounter ref_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(NullAddOn);
+};
+
+
+// Create a new add-on from a pair of add-ons.
+template <class A1, class A2>
+class AddOnPair {
+ public:
+  // Argument reference count incremented.
+  AddOnPair(A1 *a1, A2 *a2)
+      : a1_(a1), a2_(a2) {
+    if (a1_)
+      a1_->IncrRefCount();
+    if (a2_)
+      a2_->IncrRefCount();
+  }
+
+  ~AddOnPair() {
+    if (a1_ && !a1_->DecrRefCount())
+      delete a1_;
+    if (a2_ && !a2_->DecrRefCount())
+      delete a2_;
+  }
+
+  A1 *First() const { return a1_; }
+  A2 *Second() const { return a2_; }
+
+  static AddOnPair<A1, A2> *Read(istream &istrm) {
+    A1 *a1 = 0;
+    bool have_addon1 = false;
+    ReadType(istrm, &have_addon1);
+    if (have_addon1)
+      a1 = A1::Read(istrm);
+
+    A2 *a2 = 0;
+    bool have_addon2 = false;
+    ReadType(istrm, &have_addon2);
+    if (have_addon2)
+      a2 = A2::Read(istrm);
+
+    AddOnPair<A1, A2> *a = new AddOnPair<A1, A2>(a1, a2);
+    if (a1)
+      a1->DecrRefCount();
+    if (a2)
+      a2->DecrRefCount();
+    return a;
+  };
+
+  bool Write(ostream &ostrm) const {
+    bool have_addon1 = a1_;
+    WriteType(ostrm, have_addon1);
+    if (have_addon1)
+      a1_->Write(ostrm);
+    bool have_addon2 = a2_;
+    WriteType(ostrm, have_addon2);
+    if (have_addon2)
+      a2_->Write(ostrm);
+    return true;
+  }
+
+  int RefCount() const { return ref_count_.count(); }
+
+  int IncrRefCount() {
+    return ref_count_.Incr();
+  }
+
+  int DecrRefCount() {
+    return ref_count_.Decr();
+  }
+
+ private:
+  A1 *a1_;
+  A2 *a2_;
+  RefCounter ref_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(AddOnPair);
+};
+
+
+// Add to an Fst F a type T object. T must have a 'T* Read(istream &)',
+// a 'bool Write(ostream &)' method, and 'int RecCount(), 'int IncrRefCount()'
+// and 'int DecrRefCount()' methods (e.g. 'MatcherData' in matcher-fst.h).
+// The result is a new Fst implemenation with type name 'type'.
+template<class F, class T>
+class AddOnImpl : public FstImpl<typename F::Arc> {
+ public:
+  typedef typename F::Arc Arc;
+  typedef typename Arc::Label Label;
+  typedef typename Arc::Weight Weight;
+  typedef typename Arc::StateId StateId;
+
+  using FstImpl<Arc>::SetType;
+  using FstImpl<Arc>::SetProperties;
+  using FstImpl<Arc>::WriteHeader;
+
+  // If 't' is non-zero, its reference count is incremented.
+  AddOnImpl(const F &fst, const string &type, T *t = 0)
+      : fst_(fst), t_(t) {
+    SetType(type);
+    SetProperties(fst_.Properties(kFstProperties, false));
+    if (t_)
+      t_->IncrRefCount();
+  }
+
+  // If 't' is non-zero, its reference count is incremented.
+  AddOnImpl(const Fst<Arc> &fst, const string &type, T *t = 0)
+      : fst_(fst), t_(t) {
+    SetType(type);
+    SetProperties(fst_.Properties(kFstProperties, false));
+    if (t_)
+      t_->IncrRefCount();
+  }
+
+  AddOnImpl(const AddOnImpl<F, T> &impl)
+      : fst_(impl.fst_), t_(impl.t_) {
+    SetType(impl.Type());
+    SetProperties(fst_.Properties(kCopyProperties, false));
+    if (t_)
+      t_->IncrRefCount();
+  }
+
+  ~AddOnImpl() {
+    if (t_ && !t_->DecrRefCount())
+      delete t_;
+  }
+
+  StateId Start() const { return fst_.Start(); }
+  Weight Final(StateId s) const { return fst_.Final(s); }
+  size_t NumArcs(StateId s) const { return fst_.NumArcs(s); }
+
+  size_t NumInputEpsilons(StateId s) const {
+    return fst_.NumInputEpsilons(s);
+  }
+
+  size_t NumOutputEpsilons(StateId s) const {
+    return fst_.NumOutputEpsilons(s);
+  }
+
+  size_t NumStates() const { return fst_.NumStates(); }
+
+  static AddOnImpl<F, T> *Read(istream &strm, const FstReadOptions &opts) {
+    FstReadOptions nopts(opts);
+    FstHeader hdr;
+    if (!nopts.header) {
+      hdr.Read(strm, nopts.source);
+      nopts.header = &hdr;
+    }
+    AddOnImpl<F, T> *impl = new AddOnImpl<F, T>(nopts.header->FstType());
+    if (!impl->ReadHeader(strm, nopts, kMinFileVersion, &hdr))
+      return 0;
+    delete impl;       // Used here only for checking types.
+
+    int32 magic_number = 0;
+    ReadType(strm, &magic_number);   // Ensures this is an add-on Fst.
+    if (magic_number != kAddOnMagicNumber) {
+      LOG(ERROR) << "AddOnImpl::Read: Bad add-on header: " << nopts.source;
+      return 0;
+    }
+
+    FstReadOptions fopts(opts);
+    fopts.header = 0;  // Contained header was written out.
+    F *fst = F::Read(strm, fopts);
+    if (!fst)
+      return 0;
+
+    T *t = 0;
+    bool have_addon = false;
+    ReadType(strm, &have_addon);
+    if (have_addon) {   // Read add-on object if present.
+      t = T::Read(strm);
+      if (!t)
+        return 0;
+    }
+    impl = new AddOnImpl<F, T>(*fst, nopts.header->FstType(), t);
+    delete fst;
+    if (t)
+      t->DecrRefCount();
+    return impl;
+  }
+
+  bool Write(ostream &strm, const FstWriteOptions &opts) const {
+    FstHeader hdr;
+    FstWriteOptions nopts(opts);
+    nopts.write_isymbols = false;  // Let contained FST hold any symbols.
+    nopts.write_osymbols = false;
+    WriteHeader(strm, nopts, kFileVersion, &hdr);
+    WriteType(strm, kAddOnMagicNumber);  // Ensures this is an add-on Fst.
+    FstWriteOptions fopts(opts);
+    fopts.write_header = true;     // Force writing contained header.
+    if (!fst_.Write(strm, fopts))
+      return false;
+    bool have_addon = t_;
+    WriteType(strm, have_addon);
+    if (have_addon)                // Write add-on object if present.
+      t_->Write(strm);
+    return true;
+  }
+
+  void InitStateIterator(StateIteratorData<Arc> *data) const {
+    fst_.InitStateIterator(data);
+  }
+
+  void InitArcIterator(StateId s, ArcIteratorData<Arc> *data) const {
+    fst_.InitArcIterator(s, data);
+  }
+
+  F &GetFst() { return fst_; }
+
+  const F &GetFst() const { return fst_; }
+
+  T *GetAddOn() const { return t_; }
+
+  // If 't' is non-zero, its reference count is incremented.
+  void SetAddOn(T *t) {
+    if (t == t_)
+      return;
+    if (t_ && !t_->DecrRefCount())
+      delete t_;
+    t_ = t;
+    if (t_)
+      t_->IncrRefCount();
+  }
+
+ private:
+  explicit AddOnImpl(const string &type) : t_(0) {
+    SetType(type);
+    SetProperties(kExpanded);
+  }
+
+  // Current file format version
+  static const int kFileVersion = 1;
+  // Minimum file format version supported
+  static const int kMinFileVersion = 1;
+
+  F fst_;
+  T *t_;
+
+  void operator=(const AddOnImpl<F, T> &fst);  // Disallow
+};
+
+template <class F, class T> const int AddOnImpl<F, T>::kFileVersion;
+template <class F, class T> const int AddOnImpl<F, T>::kMinFileVersion;
+
+
+}  // namespace fst
+
+#endif  // FST_LIB_ADD_ON_FST_H__