Add spellcheck and word suggestion to the prediction service

third_party/android_prediction/suggest/policyimpl/dictionary/utils/format_utils.h

+/*
+ * 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 "third_party/android_prediction/defines.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.
+        VERSION_2 = 2,
+        VERSION_4_ONLY_FOR_TESTING = 399,
+        VERSION_4 = 402,
+        VERSION_4_DEV = 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 uint8_t *const dict, const int dictSize);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(FormatUtils);
+
+    static const int DICTIONARY_MINIMUM_SIZE;
+};
+} // namespace latinime
+#endif /* LATINIME_FORMAT_UTILS_H */