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https://github.com/ecency/ecency-mobile.git
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54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
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/*
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* Copyright 2016 Facebook, Inc.
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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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#include <folly/Unicode.h>
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namespace folly {
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//////////////////////////////////////////////////////////////////////
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std::string codePointToUtf8(char32_t cp) {
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std::string result;
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// Based on description from http://en.wikipedia.org/wiki/UTF-8.
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if (cp <= 0x7f) {
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result.resize(1);
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result[0] = static_cast<char>(cp);
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} else if (cp <= 0x7FF) {
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result.resize(2);
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result[1] = static_cast<char>(0x80 | (0x3f & cp));
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result[0] = static_cast<char>(0xC0 | (cp >> 6));
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} else if (cp <= 0xFFFF) {
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result.resize(3);
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result[2] = static_cast<char>(0x80 | (0x3f & cp));
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result[1] = (0x80 | static_cast<char>((0x3f & (cp >> 6))));
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result[0] = (0xE0 | static_cast<char>(cp >> 12));
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} else if (cp <= 0x10FFFF) {
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result.resize(4);
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result[3] = static_cast<char>(0x80 | (0x3f & cp));
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result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
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result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
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result[0] = static_cast<char>(0xF0 | (cp >> 18));
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}
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return result;
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}
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//////////////////////////////////////////////////////////////////////
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}
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