Chris@16: #ifndef BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP
Chris@16: #define BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@101: #if defined(_MSC_VER)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
Chris@16: // base64_from_binary.hpp
Chris@16: 
Chris@16: // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
Chris@16: // Use, modification and distribution is subject to the Boost Software
Chris@16: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  See http://www.boost.org for updates, documentation, and revision history.
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: 
Chris@16: #include <cstddef> // size_t
Chris@16: #if defined(BOOST_NO_STDC_NAMESPACE)
Chris@16: namespace std{ 
Chris@16:     using ::size_t; 
Chris@16: } // namespace std
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/serialization/pfto.hpp>
Chris@16: 
Chris@16: #include <boost/iterator/transform_iterator.hpp>
Chris@16: #include <boost/archive/iterators/dataflow_exception.hpp>
Chris@16: 
Chris@16: namespace boost { 
Chris@16: namespace archive {
Chris@16: namespace iterators {
Chris@16: 
Chris@16: /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
Chris@16: // convert binary integers to base64 characters
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: template<class CharType>
Chris@16: struct from_6_bit {
Chris@16:     typedef CharType result_type;
Chris@16:     CharType operator()(CharType t) const{
Chris@16:         const char * lookup_table = 
Chris@16:             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
Chris@16:             "abcdefghijklmnopqrstuvwxyz"
Chris@16:             "0123456789"
Chris@16:             "+/";
Chris@16:         BOOST_ASSERT(t < 64);
Chris@16:         return lookup_table[static_cast<size_t>(t)];
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: // note: what we would like to do is
Chris@101: // template<class Base, class CharType = typename Base::value_type>
Chris@16: //  typedef transform_iterator<
Chris@16: //      from_6_bit<CharType>,
Chris@16: //      transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType>
Chris@16: //  > base64_from_binary;
Chris@16: // but C++ won't accept this.  Rather than using a "type generator" and
Chris@16: // using a different syntax, make a derivation which should be equivalent.
Chris@16: //
Chris@16: // Another issue addressed here is that the transform_iterator doesn't have
Chris@16: // a templated constructor.  This makes it incompatible with the dataflow
Chris@16: // ideal.  This is also addressed here.
Chris@16: 
Chris@101: //template<class Base, class CharType = typename Base::value_type>
Chris@16: template<
Chris@16:     class Base, 
Chris@101:     class CharType = typename boost::iterator_value<Base>::type
Chris@16: >
Chris@16: class base64_from_binary : 
Chris@16:     public transform_iterator<
Chris@16:         detail::from_6_bit<CharType>,
Chris@16:         Base
Chris@16:     >
Chris@16: {
Chris@16:     friend class boost::iterator_core_access;
Chris@16:     typedef transform_iterator<
Chris@101:         typename detail::from_6_bit<CharType>,
Chris@16:         Base
Chris@16:     > super_t;
Chris@16: 
Chris@16: public:
Chris@16:     // make composible buy using templated constructor
Chris@16:     template<class T>
Chris@16:     base64_from_binary(BOOST_PFTO_WRAPPER(T) start) :
Chris@16:         super_t(
Chris@16:             Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start))),
Chris@16:             detail::from_6_bit<CharType>()
Chris@16:         )
Chris@16:     {}
Chris@16:     // intel 7.1 doesn't like default copy constructor
Chris@16:     base64_from_binary(const base64_from_binary & rhs) : 
Chris@16:         super_t(
Chris@16:             Base(rhs.base_reference()),
Chris@16:             detail::from_6_bit<CharType>()
Chris@16:         )
Chris@16:     {}
Chris@16: //    base64_from_binary(){};
Chris@16: };
Chris@16: 
Chris@16: } // namespace iterators
Chris@16: } // namespace archive
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP