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binary_from_base64.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\archive\iterators\binary_from_base64.hpp
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#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
#include
// for BOOST_DEDUCED_TYPENAME #include
#include
#include
#include
#include
namespace boost { namespace archive { namespace iterators { /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // convert base64 characters to binary data namespace detail { template
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::throw_exception( dataflow_exception(dataflow_exception::invalid_base64_character) ); return value; } }; } // namespace detail // note: what we would like to do is // template
// typedef transform_iterator< // from_6_bit
, // transform_width
// > 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
::type > class binary_from_base64 : public transform_iterator< detail::to_6_bit
, Base > { friend class boost::iterator_core_access; typedef transform_iterator< detail::to_6_bit
, Base > super_t; public: // make composible buy using templated constructor template
binary_from_base64(BOOST_PFTO_WRAPPER(T) start) : super_t( Base(BOOST_MAKE_PFTO_WRAPPER(static_cast
(start))), detail::to_6_bit
() ) {} // 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
() ) {} // binary_from_base64(){}; }; } // namespace iterators } // namespace archive } // namespace boost #endif // BOOST_ARCHIVE_ITERATORS_BINARY_FROM_BASE64_HPP
binary_from_base64.hpp
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