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#ifndef BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE32HEX_HPP
#define BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE32HEX_HPP
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// binary_from_base32hex.h (derived from boost 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 <cassert>
// We use the same boost header files used in "_from_base64". Since the
// precise path to these headers may vary depending on the boost version we
// simply include the base64 header here.
#include <boost/archive/iterators/binary_from_base64.hpp>
#include <exceptions/exceptions.h>
namespace boost {
namespace archive {
namespace iterators {
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// convert base32hex characters to binary data
namespace detail {
template<class CharType>
struct to_5_bit {
typedef CharType result_type;
CharType operator()(CharType t) const{
const signed char lookup_table[] = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 00-0f
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 10-1f
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 20-2f
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1, // 30-3f
-1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24, // 40-4f
25,26,27,28,29,30,31,-1,-1,-1,-1,-1,-1,-1,-1,-1, // 50-5f
-1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24, // 60-6f
25,26,27,28,29,30,31,-1,-1,-1,-1,-1,-1,-1,-1,-1 // 70-7f
};
BOOST_STATIC_ASSERT(0x80 == sizeof(lookup_table));
signed char value = -1;
if((unsigned)t < sizeof(lookup_table))
value = lookup_table[(unsigned)t];
if(-1 == value) {
isc_throw(isc::BadValue,
"attempt to decode a value not in base32hex char set");
}
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_5_bit<CharType>,
// transform_width<Base, 5, sizeof(Base::value_type) * 8, CharType>
// > base32hex_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_base32hex : public
transform_iterator<
detail::to_5_bit<CharType>,
Base
>
{
friend class boost::iterator_core_access;
typedef transform_iterator<
detail::to_5_bit<CharType>,
Base
> super_t;
public:
// make composable by using templated constructor
template<class T>
binary_from_base32hex(T start) :
super_t(
Base(static_cast<T>(start)),
detail::to_5_bit<CharType>()
)
{}
// intel 7.1 doesn't like default copy constructor
binary_from_base32hex(const binary_from_base32hex & rhs) :
super_t(
Base(rhs.base_reference()),
detail::to_5_bit<CharType>()
)
{}
// binary_from_base32hex(){};
};
} // namespace iterators
} // namespace archive
} // namespace boost
#endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE32HEX_HPP
// Local Variables:
// mode: c++
// End:
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