[857] | 1 | #ifndef BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP
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| 2 | #define BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP
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| 3 |
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| 4 | // MS compatible compilers support #pragma once
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| 5 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 6 | # pragma once
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| 7 | #endif
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| 8 |
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| 9 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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| 10 | // base64_from_binary.hpp
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| 11 |
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| 12 | // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
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| 13 | // Use, modification and distribution is subject to the Boost Software
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| 14 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 15 | // http://www.boost.org/LICENSE_1_0.txt)
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| 16 |
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| 17 | // See http://www.boost.org for updates, documentation, and revision history.
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| 18 |
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| 19 | #include <cassert>
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| 20 |
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| 21 | #include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME
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| 22 | #include <boost/pfto.hpp>
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| 23 |
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| 24 | #include <boost/iterator/transform_iterator.hpp>
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| 25 | #include <boost/archive/iterators/dataflow_exception.hpp>
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| 26 |
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| 27 | namespace boost {
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| 28 | namespace archive {
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| 29 | namespace iterators {
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| 30 |
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| 31 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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| 32 | // convert binary integers to base64 characters
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| 33 |
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| 34 | namespace detail {
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| 35 |
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| 36 | template<class CharType>
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| 37 | struct from_6_bit {
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| 38 | typedef CharType result_type;
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| 39 | CharType operator()(CharType t) const{
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| 40 | const char * lookup_table =
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| 41 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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| 42 | "abcdefghijklmnopqrstuvwxyz"
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| 43 | "0123456789"
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| 44 | "+/";
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| 45 | assert(t < 64);
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| 46 | return lookup_table[t];
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| 47 | }
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| 48 | };
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| 49 |
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| 50 | } // namespace detail
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| 51 |
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| 52 | // note: what we would like to do is
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| 53 | // template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type>
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| 54 | // typedef transform_iterator<
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| 55 | // from_6_bit<CharType>,
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| 56 | // transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType>
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| 57 | // > base64_from_binary;
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| 58 | // but C++ won't accept this. Rather than using a "type generator" and
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| 59 | // using a different syntax, make a derivation which should be equivalent.
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| 60 | //
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| 61 | // Another issue addressed here is that the transform_iterator doesn't have
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| 62 | // a templated constructor. This makes it incompatible with the dataflow
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| 63 | // ideal. This is also addressed here.
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| 64 |
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| 65 | //template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type>
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| 66 | template<
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| 67 | class Base,
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| 68 | class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type
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| 69 | >
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| 70 | class base64_from_binary :
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| 71 | public transform_iterator<
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| 72 | detail::from_6_bit<CharType>,
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| 73 | Base
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| 74 | >
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| 75 | {
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| 76 | friend class boost::iterator_core_access;
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| 77 | typedef transform_iterator<
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| 78 | BOOST_DEDUCED_TYPENAME detail::from_6_bit<CharType>,
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| 79 | Base
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| 80 | > super_t;
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| 81 |
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| 82 | public:
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| 83 | // make composible buy using templated constructor
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| 84 | template<class T>
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| 85 | base64_from_binary(BOOST_PFTO_WRAPPER(T) start) :
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| 86 | super_t(
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| 87 | Base(BOOST_MAKE_PFTO_WRAPPER(static_cast<T>(start))),
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| 88 | detail::from_6_bit<CharType>()
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| 89 | )
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| 90 | {}
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| 91 | // intel 7.1 doesn't like default copy constructor
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| 92 | base64_from_binary(const base64_from_binary & rhs) :
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| 93 | super_t(
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| 94 | Base(rhs.base_reference()),
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| 95 | detail::from_6_bit<CharType>()
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| 96 | )
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| 97 | {}
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| 98 | // base64_from_binary(){};
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| 99 | };
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| 100 |
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| 101 | } // namespace iterators
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| 102 | } // namespace archive
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| 103 | } // namespace boost
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| 104 |
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| 105 | #endif // BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP
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