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binary_from_base32hex.h
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1#ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE32HEX_HPP
2#define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE32HEX_HPP
3
5// binary_from_base32hex.h (derived from boost binary_from_base64.hpp)
6
7// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
8// Use, modification and distribution is subject to the Boost Software
9// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
10// http://www.boost.org/LICENSE_1_0.txt)
11
12// See http://www.boost.org for updates, documentation, and revision history.
13
14#include <cassert>
15
16// We use the same boost header files used in "_from_base64". Since the
17// precise path to these headers may vary depending on the boost version we
18// simply include the base64 header here.
19#include <boost/archive/iterators/binary_from_base64.hpp>
20
22
23namespace boost {
24namespace archive {
25namespace iterators {
26
28// convert base32hex characters to binary data
29
30namespace detail {
31
32template<class CharType>
33struct to_5_bit {
34 typedef CharType result_type;
35 CharType operator()(CharType t) const{
36 const signed char lookup_table[] = {
37 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 00-0f
38 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 10-1f
39 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 20-2f
40 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1, // 30-3f
41 -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24, // 40-4f
42 25,26,27,28,29,30,31,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 50-5f
43 -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24, // 60-6f
44 25,26,27,28,29,30,31,-1,-1,-1,-1,-1,-1,-1,-1,-1 // 70-7f
45 };
46 BOOST_STATIC_ASSERT(0x80 == sizeof(lookup_table));
47 signed char value = -1;
48 if((unsigned)t < sizeof(lookup_table))
49 value = lookup_table[(unsigned)t];
50 if(-1 == value) {
52 "attempt to decode a value not in base32hex char set");
53 }
54 return (value);
55 }
56};
57
58} // namespace detail
59
60// note: what we would like to do is
61// template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type>
62// typedef transform_iterator<
63// from_5_bit<CharType>,
64// transform_width<Base, 5, sizeof(Base::value_type) * 8, CharType>
65// > base32hex_from_binary;
66// but C++ won't accept this. Rather than using a "type generator" and
67// using a different syntax, make a derivation which should be equivalent.
68//
69// Another issue addressed here is that the transform_iterator doesn't have
70// a templated constructor. This makes it incompatible with the dataflow
71// ideal. This is also addressed here.
72
73template<
74 class Base,
75 class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type
76>
78 transform_iterator<
79 detail::to_5_bit<CharType>,
80 Base
81 >
82{
84 typedef transform_iterator<
86 Base
87 > super_t;
88public:
89 // make composable by using templated constructor
90 template<class T>
92 super_t(
93 Base(static_cast<T>(start)),
94 detail::to_5_bit<CharType>()
95 )
96 {}
97 // intel 7.1 doesn't like default copy constructor
99 super_t(
100 Base(rhs.base_reference()),
101 detail::to_5_bit<CharType>()
102 )
103 {}
104// binary_from_base32hex(){};
105};
106
107} // namespace iterators
108} // namespace archive
109} // namespace boost
110
111#endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE32HEX_HPP
112
113// Local Variables:
114// mode: c++
115// End:
binary_from_base32hex(const binary_from_base32hex &rhs)
A generic exception that is thrown if a parameter given to a method is considered invalid in that con...
#define isc_throw(type, stream)
A shortcut macro to insert known values into exception arguments.