#ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP | |
#define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP | |
// MS compatible compilers support #pragma once | |
#if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
# pragma once | |
#endif | |
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
// binary_from_base64.hpp | |
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . | |
// Use, modification and distribution is subject to the Boost Software | |
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// See http://www.boost.org for updates, documentation, and revision history. | |
#include <boost/assert.hpp> | |
#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME | |
#include <boost/serialization/throw_exception.hpp> | |
#include <boost/serialization/pfto.hpp> | |
#include <boost/static_assert.hpp> | |
#include <boost/iterator/transform_iterator.hpp> | |
#include <boost/archive/iterators/dataflow_exception.hpp> | |
namespace boost { | |
namespace archive { | |
namespace iterators { | |
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
// convert base64 characters to binary data | |
namespace detail { | |
template<class CharType> | |
struct to_6_bit { | |
typedef CharType result_type; | |
CharType operator()(CharType t) const{ | |
const char lookup_table[] = { | |
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, | |
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, | |
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63, | |
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1, | |
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, | |
15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1, | |
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, | |
41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1 | |
}; | |
// metrowerks trips this assertion - how come? | |
#if ! defined(__MWERKS__) | |
BOOST_STATIC_ASSERT(128 == sizeof(lookup_table)); | |
#endif | |
signed char value = -1; | |
if((unsigned)t <= 127) | |
value = lookup_table[(unsigned)t]; | |
if(-1 == value) | |
boost::serialization::throw_exception( | |
dataflow_exception(dataflow_exception::invalid_base64_character) | |
); | |
return value; | |
} | |
}; | |
} // namespace detail | |
// note: what we would like to do is | |
// template<class Base, class CharType = BOOST_DEDUCED_TYPENAME Base::value_type> | |
// typedef transform_iterator< | |
// from_6_bit<CharType>, | |
// transform_width<Base, 6, sizeof(Base::value_type) * 8, CharType> | |
// > base64_from_binary; | |
// but C++ won't accept this. Rather than using a "type generator" and | |
// using a different syntax, make a derivation which should be equivalent. | |
// | |
// Another issue addressed here is that the transform_iterator doesn't have | |
// a templated constructor. This makes it incompatible with the dataflow | |
// ideal. This is also addressed here. | |
template< | |
class Base, | |
class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type | |
> | |
class binary_from_base64 : public | |
transform_iterator< | |
detail::to_6_bit<CharType>, | |
Base | |
> | |
{ | |
friend class boost::iterator_core_access; | |
typedef transform_iterator< | |
detail::to_6_bit<CharType>, | |
Base | |
> super_t; | |
public: | |
// make composible buy using templated constructor | |
template<class T> | |
binary_from_base64(BOOST_PFTO_WRAPPER(T) start) : | |
super_t( | |
Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start))), | |
detail::to_6_bit<CharType>() | |
) | |
{} | |
// intel 7.1 doesn't like default copy constructor | |
binary_from_base64(const binary_from_base64 & rhs) : | |
super_t( | |
Base(rhs.base_reference()), | |
detail::to_6_bit<CharType>() | |
) | |
{} | |
// binary_from_base64(){}; | |
}; | |
} // namespace iterators | |
} // namespace archive | |
} // namespace boost | |
#endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP |