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1 | #ifndef BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP | |
2 | #define BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP | |
3 | ||
4 | // MS compatible compilers support #pragma once | |
5 | #if defined(_MSC_VER) | |
6 | # pragma once | |
7 | #endif | |
8 | ||
9 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
10 | // base64_from_binary.hpp | |
11 | ||
12 | // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . | |
13 | // Use, modification and distribution is subject to the Boost Software | |
14 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
15 | // http://www.boost.org/LICENSE_1_0.txt) | |
16 | ||
17 | // See http://www.boost.org for updates, documentation, and revision history. | |
18 | ||
19 | #include <boost/assert.hpp> | |
20 | ||
21 | #include <cstddef> // size_t | |
22 | #if defined(BOOST_NO_STDC_NAMESPACE) | |
23 | namespace std{ | |
24 | using ::size_t; | |
25 | } // namespace std | |
26 | #endif | |
27 | ||
28 | #include <boost/iterator/transform_iterator.hpp> | |
29 | #include <boost/archive/iterators/dataflow_exception.hpp> | |
30 | ||
31 | namespace boost { | |
32 | namespace archive { | |
33 | namespace iterators { | |
34 | ||
35 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
36 | // convert binary integers to base64 characters | |
37 | ||
38 | namespace detail { | |
39 | ||
40 | template<class CharType> | |
41 | struct from_6_bit { | |
42 | typedef CharType result_type; | |
43 | CharType operator()(CharType t) const{ | |
44 | const char * lookup_table = | |
45 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
46 | "abcdefghijklmnopqrstuvwxyz" | |
47 | "0123456789" | |
48 | "+/"; | |
49 | BOOST_ASSERT(t < 64); | |
50 | return lookup_table[static_cast<size_t>(t)]; | |
51 | } | |
52 | }; | |
53 | ||
54 | } // namespace detail | |
55 | ||
56 | // note: what we would like to do is | |
57 | // template<class Base, class CharType = typename Base::value_type> | |
58 | // typedef transform_iterator< | |
59 | // from_6_bit<CharType>, | |
60 | // transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType> | |
61 | // > base64_from_binary; | |
62 | // but C++ won't accept this. Rather than using a "type generator" and | |
63 | // using a different syntax, make a derivation which should be equivalent. | |
64 | // | |
65 | // Another issue addressed here is that the transform_iterator doesn't have | |
66 | // a templated constructor. This makes it incompatible with the dataflow | |
67 | // ideal. This is also addressed here. | |
68 | ||
69 | //template<class Base, class CharType = typename Base::value_type> | |
70 | template< | |
71 | class Base, | |
72 | class CharType = typename boost::iterator_value<Base>::type | |
73 | > | |
74 | class base64_from_binary : | |
75 | public transform_iterator< | |
76 | detail::from_6_bit<CharType>, | |
77 | Base | |
78 | > | |
79 | { | |
80 | friend class boost::iterator_core_access; | |
81 | typedef transform_iterator< | |
82 | typename detail::from_6_bit<CharType>, | |
83 | Base | |
84 | > super_t; | |
85 | ||
86 | public: | |
87 | // make composible buy using templated constructor | |
88 | template<class T> | |
89 | base64_from_binary(T start) : | |
90 | super_t( | |
91 | Base(static_cast< T >(start)), | |
92 | detail::from_6_bit<CharType>() | |
93 | ) | |
94 | {} | |
95 | // intel 7.1 doesn't like default copy constructor | |
96 | base64_from_binary(const base64_from_binary & rhs) : | |
97 | super_t( | |
98 | Base(rhs.base_reference()), | |
99 | detail::from_6_bit<CharType>() | |
100 | ) | |
101 | {} | |
102 | // base64_from_binary(){}; | |
103 | }; | |
104 | ||
105 | } // namespace iterators | |
106 | } // namespace archive | |
107 | } // namespace boost | |
108 | ||
109 | #endif // BOOST_ARCHIVE_ITERATORS_BASE64_FROM_BINARY_HPP |