[857] | 1 | #ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP
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| 2 | #define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_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 | // binary_from_base64.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/throw_exception.hpp>
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| 23 | #include <boost/pfto.hpp>
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| 24 |
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| 25 | #include <boost/iterator/transform_iterator.hpp>
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| 26 | #include <boost/archive/iterators/dataflow_exception.hpp>
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| 27 |
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| 28 | namespace boost {
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| 29 | namespace archive {
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| 30 | namespace iterators {
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| 31 |
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| 32 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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| 33 | // convert base64 characters to binary data
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| 34 |
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| 35 | namespace detail {
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| 36 |
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| 37 | template<class CharType>
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| 38 | struct to_6_bit {
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| 39 | typedef CharType result_type;
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| 40 | CharType operator()(CharType t) const{
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| 41 | const char lookup_table[] = {
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| 42 | -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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| 43 | -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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| 44 | -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
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| 45 | 52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,
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| 46 | -1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,
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| 47 | 15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
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| 48 | -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
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| 49 | 41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1
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| 50 | };
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| 51 | signed char value = -1;
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| 52 | if((unsigned)t <= 127)
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| 53 | value = lookup_table[(unsigned)t];
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| 54 | if(-1 == value)
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| 55 | boost::throw_exception(
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| 56 | dataflow_exception(dataflow_exception::invalid_base64_character)
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| 57 | );
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| 58 | return value;
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| 59 | }
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| 60 | };
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| 61 |
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| 62 | } // namespace detail
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| 63 |
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| 64 | // note: what we would like to do is
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| 65 | // template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type>
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| 66 | // typedef transform_iterator<
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| 67 | // from_6_bit<CharType>,
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| 68 | // transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType>
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| 69 | // > base64_from_binary;
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| 70 | // but C++ won't accept this. Rather than using a "type generator" and
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| 71 | // using a different syntax, make a derivation which should be equivalent.
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| 72 | //
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| 73 | // Another issue addressed here is that the transform_iterator doesn't have
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| 74 | // a templated constructor. This makes it incompatible with the dataflow
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| 75 | // ideal. This is also addressed here.
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| 76 |
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| 77 | template<
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| 78 | class Base,
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| 79 | class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type
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| 80 | >
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| 81 | class binary_from_base64 : public
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| 82 | transform_iterator<
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| 83 | detail::to_6_bit<CharType>,
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| 84 | Base
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| 85 | >
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| 86 | {
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| 87 | friend class boost::iterator_core_access;
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| 88 | typedef transform_iterator<
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| 89 | detail::to_6_bit<CharType>,
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| 90 | Base
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| 91 | > super_t;
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| 92 | public:
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| 93 | // make composible buy using templated constructor
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| 94 | template<class T>
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| 95 | binary_from_base64(BOOST_PFTO_WRAPPER(T) start) :
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| 96 | super_t(
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| 97 | Base(BOOST_MAKE_PFTO_WRAPPER(static_cast<T>(start))),
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| 98 | detail::to_6_bit<CharType>()
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| 99 | )
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| 100 | {}
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| 101 | // intel 7.1 doesn't like default copy constructor
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| 102 | binary_from_base64(const binary_from_base64 & rhs) :
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| 103 | super_t(
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| 104 | Base(rhs.base_reference()),
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| 105 | detail::to_6_bit<CharType>()
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| 106 | )
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| 107 | {}
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| 108 | // binary_from_base64(){};
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| 109 | };
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| 110 |
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| 111 | } // namespace iterators
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| 112 | } // namespace archive
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| 113 | } // namespace boost
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| 114 |
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| 115 | #endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP
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