1 /* 2 * Copyright (C) 2014 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_DICT_TOOLKIT_UTF8_UTILS_H 18 #define LATINIME_DICT_TOOLKIT_UTF8_UTILS_H 19 20 #include <cstdint> 21 #include <string> 22 #include <vector> 23 24 #include "dict_toolkit_defines.h" 25 #include "utils/int_array_view.h" 26 27 namespace latinime { 28 namespace dicttoolkit { 29 30 class Utf8Utils { 31 public: 32 static std::vector<int> getCodePoints(const std::string &utf8Str); 33 static std::string getUtf8String(const CodePointArrayView codePoints); 34 35 private: 36 DISALLOW_IMPLICIT_CONSTRUCTORS(Utf8Utils); 37 38 // Values indexed by sequence size. 39 static const size_t MAX_SEQUENCE_SIZE_FOR_A_CODE_POINT; 40 static const uint8_t FIRST_BYTE_MARKER_MASKS[]; 41 static const uint8_t FIRST_BYTE_MARKERS[]; 42 static const uint8_t FIRST_BYTE_CODE_POINT_BITS_MASKS[]; 43 static const int MAX_ENCODED_CODE_POINT_VALUES[]; 44 45 static const uint8_t TRAILING_BYTE_CODE_POINT_BITS_MASK; 46 static const uint8_t TRAILING_BYTE_MARKER; 47 static const size_t CODE_POINT_BIT_COUNT_IN_TRAILING_BYTE; 48 49 static int getSequenceSizeByCheckingFirstByte(const uint8_t firstByte); 50 static int maskFirstByte(const uint8_t firstByte, const int encodeSize); 51 static int maskTrailingByte(const uint8_t secondOrLaterByte); 52 static int getSequenceSizeToEncodeCodePoint(const int codePoint); 53 }; 54 } // namespace dicttoolkit 55 } // namespace latinime 56 #endif // LATINIME_DICT_TOOLKIT_UTF8_UTILS_H 57