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112 lines
3.3 KiB
112 lines
3.3 KiB
#ifndef BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP |
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#define BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// base64_from_binary.hpp |
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
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// Use, modification and distribution is subject to the Boost Software |
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// See http://www.boost.org for updates, documentation, and revision history. |
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#include <boost/assert.hpp> |
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#include <cstddef> // size_t |
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#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME |
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#if defined(BOOST_NO_STDC_NAMESPACE) |
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namespace std{ |
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using ::size_t; |
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} // namespace std |
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#endif |
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#include <boost/serialization/pfto.hpp> |
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#include <boost/iterator/transform_iterator.hpp> |
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#include <boost/archive/iterators/dataflow_exception.hpp> |
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namespace boost { |
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namespace archive { |
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namespace iterators { |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// convert binary integers to base64 characters |
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namespace detail { |
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template<class CharType> |
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struct from_6_bit { |
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typedef CharType result_type; |
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CharType operator()(CharType t) const{ |
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const char * lookup_table = |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"abcdefghijklmnopqrstuvwxyz" |
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"0123456789" |
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"+/"; |
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BOOST_ASSERT(t < 64); |
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return lookup_table[static_cast<size_t>(t)]; |
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} |
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}; |
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} // namespace detail |
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// note: what we would like to do is |
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// template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type> |
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// typedef transform_iterator< |
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// from_6_bit<CharType>, |
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// transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType> |
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// > base64_from_binary; |
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// but C++ won't accept this. Rather than using a "type generator" and |
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// using a different syntax, make a derivation which should be equivalent. |
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// |
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// Another issue addressed here is that the transform_iterator doesn't have |
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// a templated constructor. This makes it incompatible with the dataflow |
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// ideal. This is also addressed here. |
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//template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type> |
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template< |
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class Base, |
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class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type |
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> |
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class base64_from_binary : |
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public transform_iterator< |
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detail::from_6_bit<CharType>, |
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Base |
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> |
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{ |
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friend class boost::iterator_core_access; |
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typedef transform_iterator< |
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BOOST_DEDUCED_TYPENAME detail::from_6_bit<CharType>, |
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Base |
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> super_t; |
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public: |
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// make composible buy using templated constructor |
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template<class T> |
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base64_from_binary(BOOST_PFTO_WRAPPER(T) start) : |
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super_t( |
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Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start))), |
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detail::from_6_bit<CharType>() |
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) |
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{} |
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// intel 7.1 doesn't like default copy constructor |
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base64_from_binary(const base64_from_binary & rhs) : |
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super_t( |
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Base(rhs.base_reference()), |
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detail::from_6_bit<CharType>() |
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) |
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{} |
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// base64_from_binary(){}; |
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}; |
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} // namespace iterators |
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} // namespace archive |
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} // namespace boost |
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#endif // BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP
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