mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-18 10:52:16 +03:00
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
|
/*
|
||
|
|
* Copyright 2016 Facebook, Inc.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <folly/Unicode.h>
|
||
|
|
|
||
|
|
namespace folly {
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
std::string codePointToUtf8(char32_t cp) {
|
||
|
|
std::string result;
|
||
|
|
|
||
|
|
// Based on description from http://en.wikipedia.org/wiki/UTF-8.
|
||
|
|
|
||
|
|
if (cp <= 0x7f) {
|
||
|
|
result.resize(1);
|
||
|
|
result[0] = static_cast<char>(cp);
|
||
|
|
} else if (cp <= 0x7FF) {
|
||
|
|
result.resize(2);
|
||
|
|
result[1] = static_cast<char>(0x80 | (0x3f & cp));
|
||
|
|
result[0] = static_cast<char>(0xC0 | (cp >> 6));
|
||
|
|
} else if (cp <= 0xFFFF) {
|
||
|
|
result.resize(3);
|
||
|
|
result[2] = static_cast<char>(0x80 | (0x3f & cp));
|
||
|
|
result[1] = (0x80 | static_cast<char>((0x3f & (cp >> 6))));
|
||
|
|
result[0] = (0xE0 | static_cast<char>(cp >> 12));
|
||
|
|
} else if (cp <= 0x10FFFF) {
|
||
|
|
result.resize(4);
|
||
|
|
result[3] = static_cast<char>(0x80 | (0x3f & cp));
|
||
|
|
result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
|
||
|
|
result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
|
||
|
|
result[0] = static_cast<char>(0xF0 | (cp >> 18));
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
}
|