119 lines
3.9 KiB
Plaintext
119 lines
3.9 KiB
Plaintext
#ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP
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#define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// binary_from_base64.hpp
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org for updates, documentation, and revision history.
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#include <boost/assert.hpp>
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#include <boost/serialization/throw_exception.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/iterator/transform_iterator.hpp>
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#include <boost/archive/iterators/dataflow_exception.hpp>
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namespace boost {
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namespace archive {
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namespace iterators {
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// convert base64 characters to binary data
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namespace detail {
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template<class CharType>
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struct to_6_bit {
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typedef CharType result_type;
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CharType operator()(CharType t) const{
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const signed char lookup_table[] = {
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
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52,53,54,55,56,57,58,59,60,61,-1,-1,-1, 0,-1,-1, // render '=' as 0
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
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15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
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-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
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41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1
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};
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// metrowerks trips this assertion - how come?
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#if ! defined(__MWERKS__)
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BOOST_STATIC_ASSERT(128 == sizeof(lookup_table));
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#endif
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signed char value = -1;
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if((unsigned)t <= 127)
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value = lookup_table[(unsigned)t];
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if(-1 == value)
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boost::serialization::throw_exception(
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dataflow_exception(dataflow_exception::invalid_base64_character)
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);
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return value;
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}
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};
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} // namespace detail
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// note: what we would like to do is
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// template<class Base, class CharType = typename Base::value_type>
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// typedef transform_iterator<
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// from_6_bit<CharType>,
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// transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType>
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// > base64_from_binary;
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// but C++ won't accept this. Rather than using a "type generator" and
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// using a different syntax, make a derivation which should be equivalent.
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//
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// Another issue addressed here is that the transform_iterator doesn't have
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// a templated constructor. This makes it incompatible with the dataflow
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// ideal. This is also addressed here.
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template<
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class Base,
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class CharType = typename boost::iterator_value<Base>::type
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>
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class binary_from_base64 : public
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transform_iterator<
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detail::to_6_bit<CharType>,
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Base
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>
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{
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friend class boost::iterator_core_access;
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typedef transform_iterator<
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detail::to_6_bit<CharType>,
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Base
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> super_t;
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public:
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// make composible buy using templated constructor
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template<class T>
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binary_from_base64(T start) :
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super_t(
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Base(static_cast< T >(start)),
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detail::to_6_bit<CharType>()
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)
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{}
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// intel 7.1 doesn't like default copy constructor
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binary_from_base64(const binary_from_base64 & rhs) :
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super_t(
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Base(rhs.base_reference()),
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detail::to_6_bit<CharType>()
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)
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{}
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// binary_from_base64(){};
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};
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} // namespace iterators
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} // namespace archive
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} // namespace boost
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#endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP
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