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diff --git a/native/jni/src/dictionary/utils/format_utils.h b/native/jni/src/dictionary/utils/format_utils.h
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+++ b/native/jni/src/dictionary/utils/format_utils.h
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+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef LATINIME_FORMAT_UTILS_H
+#define LATINIME_FORMAT_UTILS_H
+
+#include <cstdint>
+
+#include "defines.h"
+#include "utils/byte_array_view.h"
+
+namespace latinime {
+
+/**
+ * Methods to handle binary dictionary format version.
+ */
+class FormatUtils {
+ public:
+    enum FORMAT_VERSION {
+        // These MUST have the same values as the relevant constants in FormatSpec.java.
+        // TODO: Remove VERSION_2 and VERSION_201 when we:
+        // * Confirm that old versions of LatinIME download old-format dictionaries
+        // * We no longer need the corresponding constants on the Java side for dicttool
+        VERSION_2 = 2,
+        VERSION_201 = 201,
+        VERSION_202 = 202,
+        VERSION_4_ONLY_FOR_TESTING = 399,
+        VERSION_402 = 402,
+        VERSION_403 = 403,
+        UNKNOWN_VERSION = -1
+    };
+
+    // 32 bit magic number is stored at the beginning of the dictionary header to reject
+    // unsupported or obsolete dictionary formats.
+    static const uint32_t MAGIC_NUMBER;
+
+    static FORMAT_VERSION getFormatVersion(const int formatVersion);
+    static FORMAT_VERSION detectFormatVersion(const ReadOnlyByteArrayView dictBuffer);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(FormatUtils);
+
+    static const size_t DICTIONARY_MINIMUM_SIZE;
+};
+} // namespace latinime
+#endif /* LATINIME_FORMAT_UTILS_H */