1 files changed, 116 insertions, 0 deletions
diff --git a/kaldi_io/src/tools/openfst/include/fst/icu.h b/kaldi_io/src/tools/openfst/include/fst/icu.h
new file mode 100644
index 0000000..3947716
--- /dev/null
+++ b/kaldi_io/src/tools/openfst/include/fst/icu.h
@@ -0,0 +1,116 @@
+// icu.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: sorenj@google.com (Jeffrey Sorensen)
+//         roubert@google.com (Fredrik Roubert)
+//
+// This library implements an unrestricted Thompson/Pike UTF-8 parser and
+// serializer.  UTF-8 is a restricted subset of this byte stream encoding.  See
+// http://en.wikipedia.org/wiki/UTF-8 for a good description of the encoding
+// details.
+
+#ifndef FST_LIB_ICU_H_
+#define FST_LIB_ICU_H_
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+
+namespace fst {
+
+template <class Label>
+bool UTF8StringToLabels(const string &str, vector<Label> *labels) {
+  const char *data = str.data();
+  size_t length = str.size();
+  for (int i = 0; i < length; /* no update */) {
+    int c = data[i++] & 0xff;
+    if ((c & 0x80) == 0) {
+      labels->push_back(c);
+    } else {
+      if ((c & 0xc0) == 0x80) {
+        LOG(ERROR) << "UTF8StringToLabels: continuation byte as lead byte";
+        return false;
+      }
+      int count = (c >= 0xc0) + (c >= 0xe0) + (c >= 0xf0) + (c >= 0xf8) +
+                  (c >= 0xfc);
+      int code = c & ((1 << (6 - count)) - 1);
+      while (count != 0) {
+        if (i == length) {
+          LOG(ERROR) << "UTF8StringToLabels: truncated utf-8 byte sequence";
+          return false;
+        }
+        char cb = data[i++];
+        if ((cb & 0xc0) != 0x80) {
+          LOG(ERROR) << "UTF8StringToLabels: missing/invalid continuation byte";
+          return false;
+        }
+        code = (code << 6) | (cb & 0x3f);
+        count--;
+      }
+      if (code < 0) {
+        // This should not be able to happen.
+        LOG(ERROR) << "UTF8StringToLabels: Invalid character found: " << c;
+        return false;
+      }
+      labels->push_back(code);
+    }
+  }
+  return true;
+}
+
+template <class Label>
+bool LabelsToUTF8String(const vector<Label> &labels, string *str) {
+  ostringstream ostr;
+  for (size_t i = 0; i < labels.size(); ++i) {
+    int32_t code = labels[i];
+    if (code < 0) {
+      LOG(ERROR) << "LabelsToUTF8String: Invalid character found: " << code;
+      return false;
+    } else if (code < 0x80) {
+      ostr << static_cast<char>(code);
+    } else if (code < 0x800) {
+      ostr << static_cast<char>((code >> 6) | 0xc0);
+      ostr << static_cast<char>((code & 0x3f) | 0x80);
+    } else if (code < 0x10000) {
+      ostr << static_cast<char>((code >> 12) | 0xe0);
+      ostr << static_cast<char>(((code >> 6) & 0x3f) | 0x80);
+      ostr << static_cast<char>((code & 0x3f) | 0x80);
+    } else if (code < 0x200000) {
+      ostr << static_cast<char>((code >> 18) | 0xf0);
+      ostr << static_cast<char>(((code >> 12) & 0x3f) | 0x80);
+      ostr << static_cast<char>(((code >> 6) & 0x3f) | 0x80);
+      ostr << static_cast<char>((code & 0x3f) | 0x80);
+    } else if (code < 0x4000000) {
+      ostr << static_cast<char>((code >> 24) | 0xf8);
+      ostr << static_cast<char>(((code >> 18) & 0x3f) | 0x80);
+      ostr << static_cast<char>(((code >> 12) & 0x3f) | 0x80);
+      ostr << static_cast<char>(((code >> 6) & 0x3f) | 0x80);
+      ostr << static_cast<char>((code & 0x3f) | 0x80);
+    } else {
+      ostr << static_cast<char>((code >> 30) | 0xfc);
+      ostr << static_cast<char>(((code >> 24) & 0x3f) | 0x80);
+      ostr << static_cast<char>(((code >> 18) & 0x3f) | 0x80);
+      ostr << static_cast<char>(((code >> 12) & 0x3f) | 0x80);
+      ostr << static_cast<char>(((code >> 6) & 0x3f) | 0x80);
+      ostr << static_cast<char>((code & 0x3f) | 0x80);
+    }
+  }
+  *str = ostr.str();
+  return true;
+}
+
+}  // namespace fst
+
+#endif  // FST_LIB_ICU_H_