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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2009 Tatsuhiro Tsujikawa
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef D_BASE32_H
#define D_BASE32_H
#include "common.h"
#include <string>
#include "util.h"
namespace aria2 {
namespace base32 {
std::string encode(const std::string& src);
template<typename InputIterator>
std::string decode(InputIterator first, InputIterator last)
{
std::string ret;
size_t len = last-first;
if(len%8) {
return ret;
}
bool done = false;
for(; first != last && !done; first += 8) {
uint64_t buf = 0;
size_t bits = 0;
for(size_t i = 0; i < 8; ++i) {
char ch = *(first+i);
unsigned char value;
if('A' <= ch && ch <= 'Z') {
value = ch-'A';
} else if('2' <= ch && ch <= '7') {
value = ch-'2'+26;
} else if(ch == '=') {
done = true;
break;
} else {
ret.clear();
return ret;
}
buf <<= 5;
buf += value;
bits += 5;
}
buf >>= (bits%8);
bits = bits/8*8;
buf = hton64(buf);
char* p = reinterpret_cast<char*>(&buf);
ret.append(&p[(64-bits)/8], &p[8]);
}
return ret;
}
} // namespace base32
} // namespace aria2
#endif // D_BASE32_H
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