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Boost-for-Android-Prebuilt/boost-1_72_0/include/boost/iostreams/code_converter.hpp

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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2003-2007 Jonathan Turkanis
// Distributed under 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/libs/iostreams for documentation.
// Contains machinery for performing code conversion.
#ifndef BOOST_IOSTREAMS_CODE_CONVERTER_HPP_INCLUDED
#define BOOST_IOSTREAMS_CODE_CONVERTER_HPP_INCLUDED
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/iostreams/detail/config/wide_streams.hpp>
#if defined(BOOST_IOSTREAMS_NO_WIDE_STREAMS) || \
defined(BOOST_IOSTREAMS_NO_LOCALE) \
/**/
# error code conversion not supported on this platform
#endif
#include <algorithm> // max.
#include <cstring> // memcpy.
#include <exception>
#include <boost/config.hpp> // DEDUCED_TYPENAME,
#include <boost/iostreams/char_traits.hpp>
#include <boost/iostreams/constants.hpp> // default_filter_buffer_size.
#include <boost/iostreams/detail/adapter/concept_adapter.hpp>
#include <boost/iostreams/detail/adapter/direct_adapter.hpp>
#include <boost/iostreams/detail/buffer.hpp>
#include <boost/iostreams/detail/call_traits.hpp>
#include <boost/iostreams/detail/codecvt_holder.hpp>
#include <boost/iostreams/detail/codecvt_helper.hpp>
#include <boost/iostreams/detail/double_object.hpp>
#include <boost/iostreams/detail/execute.hpp>
#include <boost/iostreams/detail/forward.hpp>
#include <boost/iostreams/detail/functional.hpp>
#include <boost/iostreams/detail/ios.hpp> // failure, openmode, int types, streamsize.
#include <boost/iostreams/detail/optional.hpp>
#include <boost/iostreams/detail/select.hpp>
#include <boost/iostreams/traits.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/static_assert.hpp>
#include <boost/throw_exception.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/is_same.hpp>
// Must come last.
#include <boost/iostreams/detail/config/disable_warnings.hpp> // Borland 5.x
namespace boost { namespace iostreams {
struct code_conversion_error : BOOST_IOSTREAMS_FAILURE {
code_conversion_error()
: BOOST_IOSTREAMS_FAILURE("code conversion error")
{ }
};
namespace detail {
//--------------Definition of strncpy_if_same---------------------------------//
// Helper template for strncpy_if_same, below.
template<bool B>
struct strncpy_if_same_impl;
template<>
struct strncpy_if_same_impl<true> {
template<typename Ch>
static Ch* copy(Ch* tgt, const Ch* src, std::streamsize n)
{ return BOOST_IOSTREAMS_CHAR_TRAITS(Ch)::copy(tgt, src, n); }
};
template<>
struct strncpy_if_same_impl<false> {
template<typename Src, typename Tgt>
static Tgt* copy(Tgt* tgt, const Src*, std::streamsize) { return tgt; }
};
template<typename Src, typename Tgt>
Tgt* strncpy_if_same(Tgt* tgt, const Src* src, std::streamsize n)
{
typedef strncpy_if_same_impl<is_same<Src, Tgt>::value> impl;
return impl::copy(tgt, src, n);
}
//--------------Definition of conversion_buffer-------------------------------//
// Buffer and conversion state for reading.
template<typename Codecvt, typename Alloc>
class conversion_buffer
: public buffer<
BOOST_DEDUCED_TYPENAME detail::codecvt_extern<Codecvt>::type,
Alloc
>
{
public:
typedef typename Codecvt::state_type state_type;
conversion_buffer()
: buffer<
BOOST_DEDUCED_TYPENAME detail::codecvt_extern<Codecvt>::type,
Alloc
>(0)
{
reset();
}
state_type& state() { return state_; }
void reset()
{
if (this->size())
this->set(0, 0);
state_ = state_type();
}
private:
state_type state_;
};
//--------------Definition of converter_impl----------------------------------//
// Contains member data, open/is_open/close and buffer management functions.
template<typename Device, typename Codecvt, typename Alloc>
struct code_converter_impl {
typedef typename codecvt_extern<Codecvt>::type extern_type;
typedef typename category_of<Device>::type device_category;
typedef is_convertible<device_category, input> can_read;
typedef is_convertible<device_category, output> can_write;
typedef is_convertible<device_category, bidirectional> is_bidir;
typedef typename
iostreams::select< // Disambiguation for Tru64.
is_bidir, bidirectional,
can_read, input,
can_write, output
>::type mode;
typedef typename
mpl::if_<
is_direct<Device>,
direct_adapter<Device>,
Device
>::type device_type;
typedef optional< concept_adapter<device_type> > storage_type;
typedef is_convertible<device_category, two_sequence> is_double;
typedef conversion_buffer<Codecvt, Alloc> buffer_type;
code_converter_impl() : cvt_(), flags_(0) { }
~code_converter_impl()
{
try {
if (flags_ & f_open) close();
} catch (...) { /* */ }
}
template <class T>
void open(const T& dev, std::streamsize buffer_size)
{
if (flags_ & f_open)
boost::throw_exception(BOOST_IOSTREAMS_FAILURE("already open"));
if (buffer_size == -1)
buffer_size = default_filter_buffer_size;
std::streamsize max_length = cvt_.get().max_length();
buffer_size = (std::max)(buffer_size, 2 * max_length);
if (can_read::value) {
buf_.first().resize(buffer_size);
buf_.first().set(0, 0);
}
if (can_write::value && !is_double::value) {
buf_.second().resize(buffer_size);
buf_.second().set(0, 0);
}
dev_.reset(concept_adapter<device_type>(dev));
flags_ = f_open;
}
void close()
{
detail::execute_all(
detail::call_member_close(*this, BOOST_IOS::in),
detail::call_member_close(*this, BOOST_IOS::out)
);
}
void close(BOOST_IOS::openmode which)
{
if (which == BOOST_IOS::in && (flags_ & f_input_closed) == 0) {
flags_ |= f_input_closed;
iostreams::close(dev(), BOOST_IOS::in);
}
if (which == BOOST_IOS::out && (flags_ & f_output_closed) == 0) {
flags_ |= f_output_closed;
detail::execute_all(
detail::flush_buffer(buf_.second(), dev(), can_write::value),
detail::call_close(dev(), BOOST_IOS::out),
detail::call_reset(dev_),
detail::call_reset(buf_.first()),
detail::call_reset(buf_.second())
);
}
}
bool is_open() const { return (flags_ & f_open) != 0;}
device_type& dev() { return **dev_; }
enum flag_type {
f_open = 1,
f_input_closed = f_open << 1,
f_output_closed = f_input_closed << 1
};
codecvt_holder<Codecvt> cvt_;
storage_type dev_;
double_object<
buffer_type,
is_double
> buf_;
int flags_;
};
} // End namespace detail.
//--------------Definition of converter---------------------------------------//
#define BOOST_IOSTREAMS_CONVERTER_PARAMS() , std::streamsize buffer_size = -1
#define BOOST_IOSTREAMS_CONVERTER_ARGS() , buffer_size
template<typename Device, typename Codecvt, typename Alloc>
struct code_converter_base {
typedef detail::code_converter_impl<
Device, Codecvt, Alloc
> impl_type;
code_converter_base() : pimpl_(new impl_type) { }
shared_ptr<impl_type> pimpl_;
};
template< typename Device,
typename Codecvt = detail::default_codecvt,
typename Alloc = std::allocator<char> >
class code_converter
: protected code_converter_base<Device, Codecvt, Alloc>
{
private:
typedef detail::code_converter_impl<
Device, Codecvt, Alloc
> impl_type;
typedef typename impl_type::device_type device_type;
typedef typename impl_type::buffer_type buffer_type;
typedef typename detail::codecvt_holder<Codecvt>::codecvt_type codecvt_type;
typedef typename detail::codecvt_intern<Codecvt>::type intern_type;
typedef typename detail::codecvt_extern<Codecvt>::type extern_type;
typedef typename detail::codecvt_state<Codecvt>::type state_type;
public:
typedef intern_type char_type;
struct category
: impl_type::mode, device_tag, closable_tag, localizable_tag
{ };
BOOST_STATIC_ASSERT((
is_same<
extern_type,
BOOST_DEDUCED_TYPENAME char_type_of<Device>::type
>::value
));
public:
code_converter() { }
BOOST_IOSTREAMS_FORWARD( code_converter, open_impl, Device,
BOOST_IOSTREAMS_CONVERTER_PARAMS,
BOOST_IOSTREAMS_CONVERTER_ARGS )
// fstream-like interface.
bool is_open() const { return this->pimpl_->is_open(); }
void close(BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out )
{ impl().close(which); }
// Device interface.
std::streamsize read(char_type*, std::streamsize);
std::streamsize write(const char_type*, std::streamsize);
void imbue(const std::locale& loc) { impl().cvt_.imbue(loc); }
// Direct device access.
Device& operator*() { return detail::unwrap_direct(dev()); }
Device* operator->() { return &detail::unwrap_direct(dev()); }
private:
template<typename T> // Used for forwarding.
void open_impl(const T& t BOOST_IOSTREAMS_CONVERTER_PARAMS())
{
impl().open(t BOOST_IOSTREAMS_CONVERTER_ARGS());
}
const codecvt_type& cvt() { return impl().cvt_.get(); }
device_type& dev() { return impl().dev(); }
buffer_type& in() { return impl().buf_.first(); }
buffer_type& out() { return impl().buf_.second(); }
impl_type& impl() { return *this->pimpl_; }
};
//--------------Implementation of converter-----------------------------------//
// Implementation note: if end of stream contains a partial character,
// it is ignored.
template<typename Device, typename Codevt, typename Alloc>
std::streamsize code_converter<Device, Codevt, Alloc>::read
(char_type* s, std::streamsize n)
{
const extern_type* next; // Next external char.
intern_type* nint; // Next internal char.
std::streamsize total = 0; // Characters read.
int status = iostreams::char_traits<char>::good();
bool partial = false;
buffer_type& buf = in();
do {
// Fill buffer.
if (buf.ptr() == buf.eptr() || partial) {
status = buf.fill(dev());
if (buf.ptr() == buf.eptr())
break;
partial = false;
}
// Convert.
std::codecvt_base::result result =
cvt().in( buf.state(),
buf.ptr(), buf.eptr(), next,
s + total, s + n, nint );
buf.ptr() += next - buf.ptr();
total = static_cast<std::streamsize>(nint - s);
switch (result) {
case std::codecvt_base::partial:
partial = true;
break;
case std::codecvt_base::ok:
break;
case std::codecvt_base::noconv:
{
std::streamsize amt =
std::min<std::streamsize>(next - buf.ptr(), n - total);
detail::strncpy_if_same(s + total, buf.ptr(), amt);
total += amt;
}
break;
case std::codecvt_base::error:
default:
buf.state() = state_type();
boost::throw_exception(code_conversion_error());
}
} while (total < n && status != EOF && status != WOULD_BLOCK);
return total == 0 && status == EOF ? -1 : total;
}
template<typename Device, typename Codevt, typename Alloc>
std::streamsize code_converter<Device, Codevt, Alloc>::write
(const char_type* s, std::streamsize n)
{
buffer_type& buf = out();
extern_type* next; // Next external char.
const intern_type* nint; // Next internal char.
std::streamsize total = 0; // Characters written.
bool partial = false;
while (total < n) {
// Empty buffer.
if (buf.eptr() == buf.end() || partial) {
if (!buf.flush(dev()))
break;
partial = false;
}
// Convert.
std::codecvt_base::result result =
cvt().out( buf.state(),
s + total, s + n, nint,
buf.eptr(), buf.end(), next );
int progress = (int) (next - buf.eptr());
buf.eptr() += progress;
switch (result) {
case std::codecvt_base::partial:
partial = true;
BOOST_FALLTHROUGH;
case std::codecvt_base::ok:
total = static_cast<std::streamsize>(nint - s);
break;
case std::codecvt_base::noconv:
{
std::streamsize amt =
std::min<std::streamsize>( nint - total - s,
buf.end() - buf.eptr() );
detail::strncpy_if_same(buf.eptr(), s + total, amt);
total += amt;
}
break;
case std::codecvt_base::error:
default:
buf.state() = state_type();
boost::throw_exception(code_conversion_error());
}
}
return total;
}
//----------------------------------------------------------------------------//
} } // End namespaces iostreams, boost.
#include <boost/iostreams/detail/config/enable_warnings.hpp> // Borland 5.x
#endif // #ifndef BOOST_IOSTREAMS_CODE_CONVERTER_HPP_INCLUDED