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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 */
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