1 /* 2 * Copyright (C) 2013, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LATINIME_FORMAT_UTILS_H 18 #define LATINIME_FORMAT_UTILS_H 19 20 #include <cstdint> 21 22 #include "defines.h" 23 #include "utils/byte_array_view.h" 24 25 namespace latinime { 26 27 /** 28 * Methods to handle binary dictionary format version. 29 */ 30 class FormatUtils { 31 public: 32 enum FORMAT_VERSION { 33 // These MUST have the same values as the relevant constants in FormatSpec.java. 34 // TODO: Remove VERSION_2 and VERSION_201 when we: 35 // * Confirm that old versions of LatinIME download old-format dictionaries 36 // * We no longer need the corresponding constants on the Java side for dicttool 37 VERSION_2 = 2, 38 VERSION_201 = 201, 39 VERSION_202 = 202, 40 VERSION_4_ONLY_FOR_TESTING = 399, 41 VERSION_402 = 402, 42 VERSION_403 = 403, 43 UNKNOWN_VERSION = -1 44 }; 45 46 // 32 bit magic number is stored at the beginning of the dictionary header to reject 47 // unsupported or obsolete dictionary formats. 48 static const uint32_t MAGIC_NUMBER; 49 50 static FORMAT_VERSION getFormatVersion(const int formatVersion); 51 static FORMAT_VERSION detectFormatVersion(const ReadOnlyByteArrayView dictBuffer); 52 53 private: 54 DISALLOW_IMPLICIT_CONSTRUCTORS(FormatUtils); 55 56 static const size_t DICTIONARY_MINIMUM_SIZE; 57 }; 58 } // namespace latinime 59 #endif /* LATINIME_FORMAT_UTILS_H */ 60
