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Diffstat (limited to 'src/lib/util/encode/base16_from_binary.h')
-rw-r--r-- | src/lib/util/encode/base16_from_binary.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/lib/util/encode/base16_from_binary.h b/src/lib/util/encode/base16_from_binary.h new file mode 100644 index 0000000..3eb697d --- /dev/null +++ b/src/lib/util/encode/base16_from_binary.h @@ -0,0 +1,103 @@ +#ifndef BOOST_ARCHIVE_ITERATORS_BASE16_FROM_BINARY_HPP +#define BOOST_ARCHIVE_ITERATORS_BASE16_FROM_BINARY_HPP + +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// base16_from_binary.h (derived from boost base64_from_binary.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 <exceptions/isc_assert.h> + +#include <cstddef> // size_t +#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME +#if defined(BOOST_NO_STDC_NAMESPACE) +namespace std{ + using ::size_t; +} // namespace std +#endif + +// See base32hex_from_binary.h for why we need base64_from...hpp here. +#include <boost/archive/iterators/base64_from_binary.hpp> + +namespace boost { +namespace archive { +namespace iterators { + +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// convert binary integers to base16 characters + +namespace detail { + +template<class CharType> +struct from_4_bit { + typedef CharType result_type; + CharType operator()(CharType t) const{ + const char * lookup_table = + "0123456789" + "ABCDEF"; + isc_throw_assert(t < 16); + return (lookup_table[static_cast<size_t>(t)]); + } +}; + +} // 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_4_bit<CharType>, +// transform_width<Base, 4, sizeof(Base::value_type) * 8, CharType> +// > base16_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 Base::value_type> +template< + class Base, + class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type +> +class base16_from_binary : + public transform_iterator< + detail::from_4_bit<CharType>, + Base + > +{ + friend class boost::iterator_core_access; + typedef transform_iterator< + BOOST_DEDUCED_TYPENAME detail::from_4_bit<CharType>, + Base + > super_t; + +public: + // make composable by using templated constructor + template<class T> + base16_from_binary(T start) : + super_t( + Base(static_cast<T>(start)), + detail::from_4_bit<CharType>() + ) + {} + // intel 7.1 doesn't like default copy constructor + base16_from_binary(const base16_from_binary & rhs) : + super_t( + Base(rhs.base_reference()), + detail::from_4_bit<CharType>() + ) + {} +// base16_from_binary(){}; +}; + +} // namespace iterators +} // namespace archive +} // namespace boost + +#endif // BOOST_ARCHIVE_ITERATORS_BASE16_FROM_BINARY_HPP |