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120 lines
3.9 KiB
120 lines
3.9 KiB
#ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |
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#define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_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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// binary_from_base64.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 <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME |
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#include <boost/serialization/throw_exception.hpp> |
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#include <boost/serialization/pfto.hpp> |
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#include <boost/static_assert.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 base64 characters to binary data |
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namespace detail { |
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template<class CharType> |
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struct to_6_bit { |
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typedef CharType result_type; |
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CharType operator()(CharType t) const{ |
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const signed char lookup_table[] = { |
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, |
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, |
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63, |
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52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1, |
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, |
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15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1, |
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-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, |
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41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1 |
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}; |
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// metrowerks trips this assertion - how come? |
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#if ! defined(__MWERKS__) |
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BOOST_STATIC_ASSERT(128 == sizeof(lookup_table)); |
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#endif |
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signed char value = -1; |
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if((unsigned)t <= 127) |
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value = lookup_table[(unsigned)t]; |
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if(-1 == value) |
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boost::serialization::throw_exception( |
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dataflow_exception(dataflow_exception::invalid_base64_character) |
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); |
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return value; |
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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< |
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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 binary_from_base64 : public |
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transform_iterator< |
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detail::to_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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detail::to_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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binary_from_base64(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::to_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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binary_from_base64(const binary_from_base64 & rhs) : |
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super_t( |
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Base(rhs.base_reference()), |
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detail::to_6_bit<CharType>() |
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) |
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{} |
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// binary_from_base64(){}; |
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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_BINARY_FROM_BASE64_HPP
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