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1 | #ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |
2 | #define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_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 | // binary_from_base64.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 <boost/serialization/throw_exception.hpp> | |
22 | #include <boost/static_assert.hpp> | |
23 | ||
24 | #include <boost/iterator/transform_iterator.hpp> | |
25 | #include <boost/archive/iterators/dataflow_exception.hpp> | |
26 | ||
27 | namespace boost { | |
28 | namespace archive { | |
29 | namespace iterators { | |
30 | ||
31 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
32 | // convert base64 characters to binary data | |
33 | ||
34 | namespace detail { | |
35 | ||
36 | template<class CharType> | |
37 | struct to_6_bit { | |
38 | typedef CharType result_type; | |
39 | CharType operator()(CharType t) const{ | |
40 | const signed char lookup_table[] = { | |
41 | -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, | |
42 | -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, | |
43 | -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63, | |
44 | 52,53,54,55,56,57,58,59,60,61,-1,-1,-1, 0,-1,-1, // render '=' as 0 | |
45 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, | |
46 | 15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1, | |
47 | -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, | |
48 | 41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1 | |
49 | }; | |
50 | // metrowerks trips this assertion - how come? | |
51 | #if ! defined(__MWERKS__) | |
52 | BOOST_STATIC_ASSERT(128 == sizeof(lookup_table)); | |
53 | #endif | |
54 | signed char value = -1; | |
55 | if((unsigned)t <= 127) | |
56 | value = lookup_table[(unsigned)t]; | |
57 | if(-1 == value) | |
58 | boost::serialization::throw_exception( | |
59 | dataflow_exception(dataflow_exception::invalid_base64_character) | |
60 | ); | |
61 | return value; | |
62 | } | |
63 | }; | |
64 | ||
65 | } // namespace detail | |
66 | ||
67 | // note: what we would like to do is | |
68 | // template<class Base, class CharType = typename Base::value_type> | |
69 | // typedef transform_iterator< | |
70 | // from_6_bit<CharType>, | |
71 | // transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType> | |
72 | // > base64_from_binary; | |
73 | // but C++ won't accept this. Rather than using a "type generator" and | |
74 | // using a different syntax, make a derivation which should be equivalent. | |
75 | // | |
76 | // Another issue addressed here is that the transform_iterator doesn't have | |
77 | // a templated constructor. This makes it incompatible with the dataflow | |
78 | // ideal. This is also addressed here. | |
79 | ||
80 | template< | |
81 | class Base, | |
82 | class CharType = typename boost::iterator_value<Base>::type | |
83 | > | |
84 | class binary_from_base64 : public | |
85 | transform_iterator< | |
86 | detail::to_6_bit<CharType>, | |
87 | Base | |
88 | > | |
89 | { | |
90 | friend class boost::iterator_core_access; | |
91 | typedef transform_iterator< | |
92 | detail::to_6_bit<CharType>, | |
93 | Base | |
94 | > super_t; | |
95 | public: | |
96 | // make composible buy using templated constructor | |
97 | template<class T> | |
98 | binary_from_base64(T start) : | |
99 | super_t( | |
100 | Base(static_cast< T >(start)), | |
101 | detail::to_6_bit<CharType>() | |
102 | ) | |
103 | {} | |
104 | // intel 7.1 doesn't like default copy constructor | |
105 | binary_from_base64(const binary_from_base64 & rhs) : | |
106 | super_t( | |
107 | Base(rhs.base_reference()), | |
108 | detail::to_6_bit<CharType>() | |
109 | ) | |
110 | {} | |
111 | // binary_from_base64(){}; | |
112 | }; | |
113 | ||
114 | } // namespace iterators | |
115 | } // namespace archive | |
116 | } // namespace boost | |
117 | ||
118 | #endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |