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139 lines
4.5 KiB
C++
139 lines
4.5 KiB
C++
#ifndef PORTABLE_BINARY_IARCHIVE_HPP
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#define PORTABLE_BINARY_IARCHIVE_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// portable_binary_iarchive.hpp
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org for updates, documentation, and revision history.
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#include <ostream>
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#include <boost/archive/binary_iarchive.hpp>
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// exception to be thrown if integer read from archive doesn't fit
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// variable being loaded
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class portable_binary_archive_exception :
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public virtual boost::archive::archive_exception
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{
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public:
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typedef enum {
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incompatible_integer_size
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} exception_code;
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portable_binary_archive_exception(exception_code c = incompatible_integer_size )
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{}
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virtual const char *what( ) const throw( )
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{
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const char *msg = "programmer error";
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switch(code){
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case incompatible_integer_size:
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msg = "integer cannot be represented";
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default:
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boost::archive::archive_exception::what();
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}
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return msg;
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}
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};
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// "Portable" input binary archive. This is a variation of the native binary
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// archive. it addresses integer size and endienness so that binary archives can
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// be passed across systems. Note:floating point types not addressed here
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class portable_binary_iarchive :
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// don't derive from binary_oarchive !!!
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public boost::archive::binary_iarchive_impl<portable_binary_iarchive>
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{
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typedef portable_binary_iarchive derived_t;
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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public:
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#else
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friend class boost::archive::basic_binary_iarchive<derived_t>;
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friend class boost::archive::basic_binary_iprimitive<derived_t, std::istream>;
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friend class boost::archive::load_access;
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#endif
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void load_impl(long & l, char maxsize){
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char size;
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size = is.get();
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if(size > maxsize)
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throw portable_binary_archive_exception() ;
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l = 0;
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load_binary(& l, size);
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// we choose to use litle endian
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#ifdef BOOST_BIG_ENDIAN
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char * first = static_cast<char *>(static_cast<void *>(& l));
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char * last = first + sizeof(l) - 1;
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for(;first < last;++first, --last){
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char x = *first;
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*last = *first;
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*first = x;
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}
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#endif
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}
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// default fall through for any types not specified here
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template<class T>
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void load(T & t){
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boost::archive::binary_iarchive_impl<derived_t>::load(t);
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}
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void load(unsigned int & t){
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long l;
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load_impl(l, sizeof(unsigned int));
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t = l;
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}
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void load(int & t){
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long l;
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load_impl(l, sizeof(int));
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t = l;
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}
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void load(unsigned long & t){
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long l;
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load_impl(l, sizeof(unsigned long));
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t = l;
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}
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void load(long & t){
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long l;
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load_impl(l, sizeof(long));
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t = l;
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}
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public:
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portable_binary_iarchive(std::istream & is, unsigned flags = 0) :
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boost::archive::binary_iarchive_impl<derived_t>(
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is,
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flags | boost::archive::no_header // skip default header checking
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)
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{
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// use our own header checking
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if(0 != (flags & boost::archive::no_header)){
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boost::archive::basic_binary_iarchive<derived_t>::init();
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// skip the following for "portable" binary archives
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// boost::archive::basic_binary_oprimitive<derived_t, std::ostream>::init();
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}
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}
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};
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// explicitly instantiate for this type of text stream
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#include <boost/archive/impl/archive_pointer_iserializer.ipp>
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#include <boost/archive/impl/basic_binary_iprimitive.ipp>
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namespace boost {
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namespace archive {
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template class basic_binary_iprimitive<portable_binary_iarchive, std::istream> ;
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template class binary_iarchive_impl<portable_binary_iarchive> ;
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template class detail::archive_pointer_iserializer<portable_binary_iarchive> ;
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} // namespace archive
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} // namespace boost
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#define BOOST_ARCHIVE_CUSTOM_IARCHIVE_TYPES portable_binary_iarchive
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#endif // PORTABLE_BINARY_IARCHIVE_HPP
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