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/*
Copyright (C) 2024 Selwin van Dijk
This file is part of signalbackup-tools.
signalbackup-tools is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
signalbackup-tools is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with signalbackup-tools. If not, see <https://www.gnu.org/licenses/>.
*/
#include "signalbackup.ih"
std::string SignalBackup::unicodeToUtf8(uint32_t unicode) const
{
std::string utf8;
if (unicode <= 0x7F) // 1 byte char
utf8 = static_cast<uint8_t>(unicode);
else if (unicode <= 0x7FF)
{
utf8 = static_cast<uint8_t>((unicode >> 6) | 0b11000000);
utf8 += static_cast<uint8_t>((unicode & 0b00111111) | 0b10000000);
}
else if (unicode <= 0xFFFF)
{
utf8 = static_cast<uint8_t>((unicode >> 12) | 0b11100000);
utf8 += static_cast<uint8_t>(((unicode >> 6) & 0b00111111) | 0b10000000);
utf8 += static_cast<uint8_t>((unicode & 0b00111111) | 0b10000000);
}
else // if (unicode <= 0x10FFF)
{
utf8 = static_cast<uint8_t>((unicode >> 18) | 0b11110000);
utf8 += static_cast<uint8_t>(((unicode >> 12) & 0b00111111) | 0b10000000);
utf8 += static_cast<uint8_t>(((unicode >> 6) & 0b00111111) | 0b10000000);
utf8 += static_cast<uint8_t>((unicode & 0b00111111) | 0b10000000);
}
return utf8;
}
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