monero/external/boost/archive/portable_binary_oarchive.hpp
moneromooo-monero c1fa4a7f8c
boost: fix little/big endian compatibility
When no little/big endian flag is given to the writer, it stores
data in host endianness. When loading, if no flag is set, it also
assumes host endianness. This works as long as the loading and
writing are done on machines with the same endianness.

We change this to default to little endian when saving. This will
cause the loader to see the little endian flag, and swap endianness
when loading on a big endian machine. Similarly, writing on a big
endian machine will swap on save, and a little endian machine will
load little endian data.
2019-09-04 14:54:00 +00:00

320 lines
9.5 KiB
C++

#ifndef PORTABLE_BINARY_OARCHIVE_HPP
#define PORTABLE_BINARY_OARCHIVE_HPP
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
#if defined(_MSC_VER)
#pragma warning( push )
#pragma warning( disable : 4244 )
#endif
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// portable_binary_oarchive.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 <ostream>
#include <boost/version.hpp>
#include <boost/serialization/string.hpp>
#include <boost/archive/archive_exception.hpp>
#include <boost/archive/basic_binary_oprimitive.hpp>
#include <boost/archive/detail/common_oarchive.hpp>
#include <boost/archive/detail/register_archive.hpp>
#include <boost/archive/portable_binary_archive.hpp>
#include <boost/archive/impl/basic_binary_oprimitive.ipp>
namespace boost { namespace archive {
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// exception to be thrown if integer read from archive doesn't fit
// variable being loaded
class portable_binary_oarchive_exception :
public boost::archive::archive_exception
{
public:
enum exception_code {
invalid_flags
} m_exception_code ;
portable_binary_oarchive_exception(exception_code c = invalid_flags ) :
boost::archive::archive_exception(boost::archive::archive_exception::other_exception),
m_exception_code(c)
{}
virtual const char *what( ) const throw( )
{
const char *msg = "programmer error";
switch(m_exception_code){
case invalid_flags:
msg = "cannot be both big and little endian";
break;
default:
msg = boost::archive::archive_exception::what();
assert(false);
break;
}
return msg;
}
};
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// "Portable" output binary archive. This is a variation of the native binary
// archive. it addresses integer size and endienness so that binary archives can
// be passed across systems. Note:floating point types not addressed here
class portable_binary_oarchive :
public boost::archive::basic_binary_oprimitive<
portable_binary_oarchive,
std::ostream::char_type,
std::ostream::traits_type
>,
public boost::archive::detail::common_oarchive<
portable_binary_oarchive
>
{
typedef boost::archive::basic_binary_oprimitive<
portable_binary_oarchive,
std::ostream::char_type,
std::ostream::traits_type
> primitive_base_t;
typedef boost::archive::detail::common_oarchive<
portable_binary_oarchive
> archive_base_t;
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
public:
#else
friend archive_base_t;
friend primitive_base_t; // since with override save below
friend class boost::archive::detail::interface_oarchive<
portable_binary_oarchive
>;
friend class boost::archive::save_access;
protected:
#endif
unsigned int m_flags;
void save_impl(const boost::intmax_t l, const char maxsize);
// add base class to the places considered when matching
// save function to a specific set of arguments. Note, this didn't
// work on my MSVC 7.0 system so we use the sure-fire method below
// using archive_base_t::save;
// default fall through for any types not specified here
template<class T>
void save(const T & t){
save_impl(t, sizeof(T));
}
void save(const std::string & t){
this->primitive_base_t::save(t);
}
#ifndef BOOST_NO_STD_WSTRING
void save(const std::wstring & t){
this->primitive_base_t::save(t);
}
#endif
void save(const float & t){
this->primitive_base_t::save(t);
// floats not supported
//BOOST_STATIC_ASSERT(false);
}
void save(const double & t){
this->primitive_base_t::save(t);
// doubles not supported
//BOOST_STATIC_ASSERT(false);
}
void save(const char & t){
this->primitive_base_t::save(t);
}
void save(const unsigned char & t){
this->primitive_base_t::save(t);
}
// default processing - kick back to base class. Note the
// extra stuff to get it passed borland compilers
typedef boost::archive::detail::common_oarchive<portable_binary_oarchive>
detail_common_oarchive;
#if BOOST_VERSION > 105800
template<class T>
void save_override(T & t){
this->detail_common_oarchive::save_override(t);
}
// explicitly convert to char * to avoid compile ambiguities
void save_override(const boost::archive::class_name_type & t){
const std::string s(t);
* this << s;
}
// binary files don't include the optional information
void save_override(
const boost::archive::class_id_optional_type & /* t */
){}
#else
template<class T>
void save_override(T & t, int){
this->detail_common_oarchive::save_override(t, 0);
}
// explicitly convert to char * to avoid compile ambiguities
void save_override(const boost::archive::class_name_type & t, int){
const std::string s(t);
* this << s;
}
// binary files don't include the optional information
void save_override(
const boost::archive::class_id_optional_type & /* t */, int
){}
#endif
void init(unsigned int flags);
public:
portable_binary_oarchive(std::ostream & os, unsigned flags = endian_little) :
primitive_base_t(
* os.rdbuf(),
0 != (flags & boost::archive::no_codecvt)
),
archive_base_t(flags),
m_flags(flags & (endian_big | endian_little))
{
init(flags);
}
portable_binary_oarchive(
std::basic_streambuf<
std::ostream::char_type,
std::ostream::traits_type
> & bsb,
unsigned int flags
) :
primitive_base_t(
bsb,
0 != (flags & boost::archive::no_codecvt)
),
archive_base_t(flags),
m_flags(0)
{
init(flags);
}
};
} }
// required by export in boost version > 1.34
#ifdef BOOST_SERIALIZATION_REGISTER_ARCHIVE
BOOST_SERIALIZATION_REGISTER_ARCHIVE(portable_binary_oarchive)
#endif
// required by export in boost <= 1.34
#define BOOST_ARCHIVE_CUSTOM_OARCHIVE_TYPES portable_binary_oarchive
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// portable_binary_oarchive.cpp
// (C) Copyright 2002-7 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 <ostream>
#include <boost/predef/other/endian.h>
namespace boost { namespace archive {
inline void
portable_binary_oarchive::save_impl(
const boost::intmax_t l,
const char maxsize
){
signed char size = 0;
if(l == 0){
this->primitive_base_t::save(size);
return;
}
boost::intmax_t ll;
bool negative = (l < 0);
if(negative)
ll = -l;
else
ll = l;
do{
ll >>= CHAR_BIT;
++size;
}while(ll != 0);
this->primitive_base_t::save(
static_cast<signed char>(negative ? -size : size)
);
if(negative)
ll = -l;
else
ll = l;
char * cptr = reinterpret_cast<char *>(& ll);
#if BOOST_ENDIAN_BIG_BYTE
cptr += (sizeof(boost::intmax_t) - size);
if(m_flags & endian_little)
reverse_bytes(size, cptr);
#else
if(m_flags & endian_big)
reverse_bytes(size, cptr);
#endif
this->primitive_base_t::save_binary(cptr, size);
}
inline void
portable_binary_oarchive::init(unsigned int flags) {
if(m_flags == (endian_big | endian_little)){
boost::serialization::throw_exception(
portable_binary_oarchive_exception()
);
}
if(0 == (flags & boost::archive::no_header)){
// write signature in an archive version independent manner
const std::string file_signature(
boost::archive::BOOST_ARCHIVE_SIGNATURE()
);
* this << file_signature;
// ignore archive version checking
const boost::archive::library_version_type v{};
/*
// write library version
const boost::archive::library_version_type v(
boost::archive::BOOST_ARCHIVE_VERSION()
);
*/
* this << v;
}
save(static_cast<unsigned char>(m_flags >> CHAR_BIT));
}
} }
namespace boost {
namespace archive {
namespace detail {
template class archive_serializer_map<portable_binary_oarchive>;
}
// template class basic_binary_oprimitive<
// portable_binary_oarchive,
// std::ostream::char_type,
// std::ostream::traits_type
// > ;
} // namespace archive
} // namespace boost
#if defined(_MSC_VER)
#pragma warning( pop )
#endif
#endif // PORTABLE_BINARY_OARCHIVE_HPP