60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
/*
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* Copyright (C) 2013, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LATINIME_FORMAT_UTILS_H
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#define LATINIME_FORMAT_UTILS_H
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#include <cstdint>
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#include "defines.h"
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#include "utils/byte_array_view.h"
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namespace latinime {
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/**
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* Methods to handle binary dictionary format version.
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*/
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class FormatUtils {
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public:
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enum FORMAT_VERSION {
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// These MUST have the same values as the relevant constants in FormatSpec.java.
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// TODO: Remove VERSION_2 and VERSION_201 when we:
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// * Confirm that old versions of LatinIME download old-format dictionaries
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// * We no longer need the corresponding constants on the Java side for dicttool
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VERSION_2 = 2,
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VERSION_201 = 201,
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VERSION_202 = 202,
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VERSION_4_ONLY_FOR_TESTING = 399,
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VERSION_402 = 402,
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VERSION_403 = 403,
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UNKNOWN_VERSION = -1
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};
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// 32 bit magic number is stored at the beginning of the dictionary header to reject
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// unsupported or obsolete dictionary formats.
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static const uint32_t MAGIC_NUMBER;
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static FORMAT_VERSION getFormatVersion(const int formatVersion);
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static FORMAT_VERSION detectFormatVersion(const ReadOnlyByteArrayView dictBuffer);
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(FormatUtils);
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static const size_t DICTIONARY_MINIMUM_SIZE;
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};
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} // namespace latinime
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#endif /* LATINIME_FORMAT_UTILS_H */
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