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Contents
// Copyright (c) 2017-2022 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/json/
#ifndef TAO_JSON_INTERNAL_BASE64_HPP
#define TAO_JSON_INTERNAL_BASE64_HPP
#include <stdexcept>
#include <string>
namespace tao::json::internal
{
template< typename T >
[[nodiscard]] std::string base64( const T& v )
{
static const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
std::string s;
s.reserve( ( v.size() + 2 ) / 3 * 4 );
unsigned cycle = 0;
unsigned encode = 0;
for( const auto c : v ) {
encode <<= 8;
encode += static_cast< unsigned char >( c );
s += table[ ( encode >> ( ++cycle * 2 ) ) & 0x3f ];
if( cycle == 3 ) {
cycle = 0;
s += table[ encode & 0x3f ];
}
}
switch( cycle ) {
case 0:
break;
case 1:
s += table[ ( encode << 4 ) & 0x3f ];
s += "==";
break;
case 2:
s += table[ ( encode << 2 ) & 0x3f ];
s += '=';
break;
default:
throw std::logic_error( "code should be unreachable" ); // LCOV_EXCL_LINE
}
return s;
}
} // namespace tao::json::internal
#endif
Version data entries
7 entries across 7 versions & 1 rubygems