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/**
* Copyright (c) 2020 Paul-Louis Ageneau
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if RTC_ENABLE_WEBSOCKET
#include "base64.hpp"
namespace rtc {
using std::to_integer;
string to_base64(const binary &data) {
static const char tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
string out;
out.reserve(3 * ((data.size() + 3) / 4));
int i = 0;
while (data.size() - i >= 3) {
auto d0 = to_integer<uint8_t>(data[i]);
auto d1 = to_integer<uint8_t>(data[i + 1]);
auto d2 = to_integer<uint8_t>(data[i + 2]);
out += tab[d0 >> 2];
out += tab[((d0 & 3) << 4) | (d1 >> 4)];
out += tab[((d1 & 0x0F) << 2) | (d2 >> 6)];
out += tab[d2 & 0x3F];
i += 3;
}
int left = int(data.size() - i);
if (left) {
auto d0 = to_integer<uint8_t>(data[i]);
out += tab[d0 >> 2];
if (left == 1) {
out += tab[(d0 & 3) << 4];
out += '=';
} else { // left == 2
auto d1 = to_integer<uint8_t>(data[i + 1]);
out += tab[((d0 & 3) << 4) | (d1 >> 4)];
out += tab[(d1 & 0x0F) << 2];
}
out += '=';
}
return out;
}
} // namespace rtc
#endif