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Diffstat (limited to '3rdParty/Boost/src/boost/archive/iterators/transform_width.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/archive/iterators/transform_width.hpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/archive/iterators/transform_width.hpp b/3rdParty/Boost/src/boost/archive/iterators/transform_width.hpp new file mode 100644 index 0000000..6e2c526 --- /dev/null +++ b/3rdParty/Boost/src/boost/archive/iterators/transform_width.hpp @@ -0,0 +1,170 @@ +#ifndef BOOST_ARCHIVE_ITERATORS_TRANSFORM_WIDTH_HPP +#define BOOST_ARCHIVE_ITERATORS_TRANSFORM_WIDTH_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 +// transform_width.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. + +// iterator which takes elements of x bits and returns elements of y bits. +// used to change streams of 8 bit characters into streams of 6 bit characters. +// and vice-versa for implementing base64 encodeing/decoding. Be very careful +// when using and end iterator. end is only reliable detected when the input +// stream length is some common multiple of x and y. E.G. Base64 6 bit +// character and 8 bit bytes. Lowest common multiple is 24 => 4 6 bit characters +// or 3 8 bit characters + +#include <algorithm> + +#include <boost/config.hpp> // for BOOST_DEDUCED_TYPENAME & PTFO +#include <boost/serialization/pfto.hpp> + +#include <boost/iterator/iterator_adaptor.hpp> +#include <boost/iterator/iterator_traits.hpp> + +namespace boost { +namespace archive { +namespace iterators { + +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// class used by text archives to translate char strings to wchar_t +// strings of the currently selected locale +template< + class Base, + int BitsOut, + int BitsIn, + class CharType = BOOST_DEDUCED_TYPENAME boost::iterator_value<Base>::type // output character +> +class transform_width : + public boost::iterator_adaptor< + transform_width<Base, BitsOut, BitsIn, CharType>, + Base, + CharType, + single_pass_traversal_tag, + CharType + > +{ + friend class boost::iterator_core_access; + typedef BOOST_DEDUCED_TYPENAME boost::iterator_adaptor< + transform_width<Base, BitsOut, BitsIn, CharType>, + Base, + CharType, + single_pass_traversal_tag, + CharType + > super_t; + + typedef transform_width<Base, BitsOut, BitsIn, CharType> this_t; + typedef BOOST_DEDUCED_TYPENAME iterator_value<Base>::type base_value_type; + + CharType fill(); + + CharType dereference_impl(){ + if(! m_full){ + m_current_value = fill(); + m_full = true; + } + return m_current_value; + } + + CharType dereference() const { + return const_cast<this_t *>(this)->dereference_impl(); + } + + // test for iterator equality + bool equal(const this_t & rhs) const { + return + this->base_reference() == rhs.base_reference(); + ; + } + + void increment(){ + m_displacement += BitsOut; + + while(m_displacement >= BitsIn){ + m_displacement -= BitsIn; + if(0 == m_displacement) + m_bufferfull = false; + if(! m_bufferfull){ + // note: suspect that this is not invoked for borland + ++(this->base_reference()); + } + } + m_full = false; + } + + CharType m_current_value; + // number of bits left in current input character buffer + unsigned int m_displacement; + base_value_type m_buffer; + // flag to current output character is ready - just used to save time + bool m_full; + // flag to indicate that m_buffer has data + bool m_bufferfull; + +public: + // make composible buy using templated constructor + template<class T> + transform_width(BOOST_PFTO_WRAPPER(T) start) : + super_t(Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start)))), + m_displacement(0), + m_full(false), + m_bufferfull(false) + {} + // intel 7.1 doesn't like default copy constructor + transform_width(const transform_width & rhs) : + super_t(rhs.base_reference()), + m_current_value(rhs.m_current_value), + m_displacement(rhs.m_displacement), + m_buffer(rhs.m_buffer), + m_full(rhs.m_full), + m_bufferfull(rhs.m_bufferfull) + {} +}; + +template<class Base, int BitsOut, int BitsIn, class CharType> +CharType transform_width<Base, BitsOut, BitsIn, CharType>::fill(){ + CharType retval = 0; + unsigned int missing_bits = BitsOut; + for(;;){ + unsigned int bcount; + if(! m_bufferfull){ + m_buffer = * this->base_reference(); + m_bufferfull = true; + bcount = BitsIn; + } + else + bcount = BitsIn - m_displacement; + unsigned int i = (std::min)(bcount, missing_bits); + // shift interesting bits to least significant position + unsigned int j = m_buffer >> (bcount - i); + // strip off uninteresting bits + // (note presumption of two's complement arithmetic) + j &= ~(-(1 << i)); + // append then interesting bits to the output value + retval <<= i; + retval |= j; + missing_bits -= i; + if(0 == missing_bits) + break; + // note: suspect that this is not invoked for borland 5.51 + ++(this->base_reference()); + m_bufferfull = false; + } + return retval; +} + +} // namespace iterators +} // namespace archive +} // namespace boost + +#endif // BOOST_ARCHIVE_ITERATORS_TRANSFORM_WIDTH_HPP |