mirror of https://github.com/aria2/aria2
100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2009 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "base32.h"
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#include "util.h"
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namespace aria2 {
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namespace base32 {
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namespace {
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const char B32TABLE[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', '2', '3', '4', '5', '6', '7'
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};
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} // namespace
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std::string encode(const std::string& src)
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{
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std::string ret;
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size_t count = 0;
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uint64_t buf = 0;
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for(const auto& ch: src) {
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buf <<= 8;
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buf += ch & 0xffu;
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++count;
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if(count == 5) {
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char temp[8];
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for(size_t j = 0; j < 8; ++j) {
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temp[7-j] = B32TABLE[buf&0x1fu];
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buf >>= 5;
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}
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ret.append(&temp[0], &temp[8]);
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count = 0;
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buf = 0;
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}
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}
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size_t r = 0;
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if(count == 1) {
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buf <<= 2;
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r = 2;
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} else if(count == 2) {
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buf <<= 4;
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r = 4;
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} else if(count == 3) {
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buf <<= 1;
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r = 5;
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} else if(count == 4) {
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buf <<= 3;
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r = 7;
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}
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char temp[7];
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for(size_t j = 0; j < r; ++j) {
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temp[r-1-j] = B32TABLE[buf&0x1fu];
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buf >>= 5;
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}
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ret.append(&temp[0], &temp[r]);
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if(r) {
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ret.append(8-r, '=');
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}
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return ret;
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}
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} // namespace base32
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} // namespace aria2
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