| #ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |
| #define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |
| |
| // MS compatible compilers support #pragma once |
| #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| # pragma once |
| #endif |
| |
| /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
| // binary_from_base64.hpp |
| |
| // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
| // Use, modification and distribution is subject to the Boost Software |
| // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| // See http://www.boost.org for updates, documentation, and revision history. |
| |
| #include <cassert> |
| |
| #include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME |
| #include <boost/serialization/throw_exception.hpp> |
| #include <boost/serialization/pfto.hpp> |
| #include <boost/static_assert.hpp> |
| |
| #include <boost/iterator/transform_iterator.hpp> |
| #include <boost/archive/iterators/dataflow_exception.hpp> |
| |
| namespace boost { |
| namespace archive { |
| namespace iterators { |
| |
| /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
| // convert base64 characters to binary data |
| |
| namespace detail { |
| |
| template<class CharType> |
| struct to_6_bit { |
| typedef CharType result_type; |
| CharType operator()(CharType t) const{ |
| const char lookup_table[] = { |
| -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, |
| -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, |
| -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63, |
| 52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1, |
| -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, |
| 15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1, |
| -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, |
| 41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1 |
| }; |
| // metrowerks trips this assertion - how come? |
| #if ! defined(__MWERKS__) |
| BOOST_STATIC_ASSERT(128 == sizeof(lookup_table)); |
| #endif |
| signed char value = -1; |
| if((unsigned)t <= 127) |
| value = lookup_table[(unsigned)t]; |
| if(-1 == value) |
| boost::serialization::throw_exception( |
| dataflow_exception(dataflow_exception::invalid_base64_character) |
| ); |
| return value; |
| } |
| }; |
| |
| } // namespace detail |
| |
| // note: what we would like to do is |
| // template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type> |
| // typedef transform_iterator< |
| // from_6_bit<CharType>, |
| // transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType> |
| // > base64_from_binary; |
| // but C++ won't accept this. Rather than using a "type generator" and |
| // using a different syntax, make a derivation which should be equivalent. |
| // |
| // Another issue addressed here is that the transform_iterator doesn't have |
| // a templated constructor. This makes it incompatible with the dataflow |
| // ideal. This is also addressed here. |
| |
| template< |
| class Base, |
| class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type |
| > |
| class binary_from_base64 : public |
| transform_iterator< |
| detail::to_6_bit<CharType>, |
| Base |
| > |
| { |
| friend class boost::iterator_core_access; |
| typedef transform_iterator< |
| detail::to_6_bit<CharType>, |
| Base |
| > super_t; |
| public: |
| // make composible buy using templated constructor |
| template<class T> |
| binary_from_base64(BOOST_PFTO_WRAPPER(T) start) : |
| super_t( |
| Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start))), |
| detail::to_6_bit<CharType>() |
| ) |
| {} |
| // intel 7.1 doesn't like default copy constructor |
| binary_from_base64(const binary_from_base64 & rhs) : |
| super_t( |
| Base(rhs.base_reference()), |
| detail::to_6_bit<CharType>() |
| ) |
| {} |
| // binary_from_base64(){}; |
| }; |
| |
| } // namespace iterators |
| } // namespace archive |
| } // namespace boost |
| |
| #endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |