/* | |
* 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. | |
* File: boost/iostreams/detail/restrict_impl.hpp | |
* Date: Sun Jan 06 12:57:30 MST 2008 | |
* Copyright: 2007-2008 CodeRage, LLC | |
* Author: Jonathan Turkanis | |
* Contact: turkanis at coderage dot com | |
* | |
* If included with the macro BOOST_IOSTREAMS_RESTRICT undefined, defines the | |
* class template boost::iostreams::restriction. If included with the macro | |
* BOOST_IOSTREAMS_RESTRICT defined as an identifier, defines the overloaded | |
* function template boost::iostreams::BOOST_IOSTREAMS_RESTRICT, and object | |
* generator for boost::iostreams::restriction. | |
* | |
* This design allows <boost/iostreams/restrict.hpp> and | |
* <boost/iostreams/slice.hpp> to share an implementation. | |
*/ | |
#if !defined(BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED) && \ | |
!defined(BOOST_IOSTREAMS_RESTRICT) | |
# define BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED | |
//------------------Implementation of restriction-----------------------------// | |
# include <algorithm> // min. | |
# include <utility> // pair. | |
# include <boost/cstdint.hpp> // intmax_t. | |
# include <boost/config.hpp> // DEDUCED_TYPENAME. | |
# include <boost/iostreams/categories.hpp> | |
# include <boost/iostreams/char_traits.hpp> | |
# include <boost/iostreams/detail/adapter/device_adapter.hpp> | |
# include <boost/iostreams/detail/adapter/filter_adapter.hpp> | |
# include <boost/iostreams/detail/call_traits.hpp> | |
# include <boost/iostreams/detail/enable_if_stream.hpp> | |
# include <boost/iostreams/detail/error.hpp> | |
# include <boost/iostreams/detail/ios.hpp> // failure. | |
# include <boost/iostreams/detail/select.hpp> | |
# include <boost/iostreams/operations.hpp> | |
# include <boost/iostreams/skip.hpp> | |
# include <boost/iostreams/traits.hpp> // mode_of, is_direct. | |
# include <boost/mpl/bool.hpp> | |
# include <boost/static_assert.hpp> | |
# include <boost/throw_exception.hpp> | |
# include <boost/type_traits/is_convertible.hpp> | |
# include <boost/iostreams/detail/config/disable_warnings.hpp> | |
namespace boost { namespace iostreams { | |
namespace detail { | |
// | |
// Template name: restricted_indirect_device. | |
// Description: Provides an restricted view of an indirect Device. | |
// Template paramters: | |
// Device - An indirect model of Device that models either Source or | |
// SeekableDevice. | |
// | |
template<typename Device> | |
class restricted_indirect_device : public device_adapter<Device> { | |
private: | |
typedef typename detail::param_type<Device>::type param_type; | |
public: | |
typedef typename char_type_of<Device>::type char_type; | |
typedef typename mode_of<Device>::type mode; | |
BOOST_STATIC_ASSERT(!(is_convertible<mode, detail::two_sequence>::value)); | |
struct category | |
: mode, | |
device_tag, | |
closable_tag, | |
flushable_tag, | |
localizable_tag, | |
optimally_buffered_tag | |
{ }; | |
restricted_indirect_device( param_type dev, stream_offset off, | |
stream_offset len = -1 ); | |
std::streamsize read(char_type* s, std::streamsize n); | |
std::streamsize write(const char_type* s, std::streamsize n); | |
std::streampos seek(stream_offset off, BOOST_IOS::seekdir way); | |
private: | |
stream_offset beg_, pos_, end_; | |
}; | |
// | |
// Template name: restricted_direct_device. | |
// Description: Provides an restricted view of a Direct Device. | |
// Template paramters: | |
// Device - A model of Direct and Device. | |
// | |
template<typename Device> | |
class restricted_direct_device : public device_adapter<Device> { | |
public: | |
typedef typename char_type_of<Device>::type char_type; | |
typedef std::pair<char_type*, char_type*> pair_type; | |
typedef typename mode_of<Device>::type mode; | |
BOOST_STATIC_ASSERT(!(is_convertible<mode, detail::two_sequence>::value)); | |
struct category | |
: mode_of<Device>::type, | |
device_tag, | |
direct_tag, | |
closable_tag, | |
localizable_tag | |
{ }; | |
restricted_direct_device( const Device& dev, stream_offset off, | |
stream_offset len = -1 ); | |
pair_type input_sequence(); | |
pair_type output_sequence(); | |
private: | |
pair_type sequence(mpl::true_); | |
pair_type sequence(mpl::false_); | |
char_type *beg_, *end_; | |
}; | |
// | |
// Template name: restricted_filter. | |
// Description: Provides an restricted view of a Filter. | |
// Template paramters: | |
// Filter - An indirect model of Filter. | |
// | |
template<typename Filter> | |
class restricted_filter : public filter_adapter<Filter> { | |
public: | |
typedef typename char_type_of<Filter>::type char_type; | |
typedef typename mode_of<Filter>::type mode; | |
BOOST_STATIC_ASSERT(!(is_convertible<mode, detail::two_sequence>::value)); | |
struct category | |
: mode, | |
filter_tag, | |
multichar_tag, | |
closable_tag, | |
localizable_tag, | |
optimally_buffered_tag | |
{ }; | |
restricted_filter( const Filter& flt, stream_offset off, | |
stream_offset len = -1 ); | |
template<typename Source> | |
std::streamsize read(Source& src, char_type* s, std::streamsize n) | |
{ | |
using namespace std; | |
if (!open_) | |
open(src, BOOST_IOS::in); | |
std::streamsize amt = | |
end_ != -1 ? | |
(std::min) (n, static_cast<std::streamsize>(end_ - pos_)) : | |
n; | |
std::streamsize result = | |
iostreams::read(this->component(), src, s, amt); | |
if (result != -1) | |
pos_ += result; | |
return result; | |
} | |
template<typename Sink> | |
std::streamsize write(Sink& snk, const char_type* s, std::streamsize n) | |
{ | |
if (!open_) | |
open(snk, BOOST_IOS::out); | |
if (end_ != -1 && pos_ + n >= end_) { | |
if(pos_ < end_) | |
pos_ += iostreams::write(this->component(), | |
snk, s, end_ - pos_); | |
boost::throw_exception(bad_write()); | |
} | |
std::streamsize result = | |
iostreams::write(this->component(), snk, s, n); | |
pos_ += result; | |
return result; | |
} | |
template<typename Device> | |
std::streampos seek(Device& dev, stream_offset off, BOOST_IOS::seekdir way) | |
{ | |
stream_offset next; | |
if (way == BOOST_IOS::beg) { | |
next = beg_ + off; | |
} else if (way == BOOST_IOS::cur) { | |
next = pos_ + off; | |
} else if (end_ != -1) { | |
next = end_ + off; | |
} else { | |
// Restriction is half-open; seek relative to the actual end. | |
pos_ = this->component().seek(dev, off, BOOST_IOS::end); | |
if (pos_ < beg_) | |
boost::throw_exception(bad_seek()); | |
return offset_to_position(pos_ - beg_); | |
} | |
if (next < beg_ || (end_ != -1 && next >= end_)) | |
boost::throw_exception(bad_seek()); | |
pos_ = this->component().seek(dev, next, BOOST_IOS::cur); | |
return offset_to_position(pos_ - beg_); | |
} | |
template<typename Device> | |
void close(Device& dev) | |
{ | |
open_ = false; | |
detail::close_all(this->component(), dev); | |
} | |
template<typename Device> | |
void close(Device& dev, BOOST_IOS::openmode which) | |
{ | |
open_ = false; | |
iostreams::close(this->component(), dev, which); | |
} | |
private: | |
template<typename Device> | |
void open(Device& dev, BOOST_IOS::openmode which) | |
{ | |
typedef typename is_convertible<mode, dual_use>::type is_dual_use; | |
open_ = true; | |
which = is_dual_use() ? which : (BOOST_IOS::in | BOOST_IOS::out); | |
iostreams::skip(this->component(), dev, beg_, which); | |
} | |
stream_offset beg_, pos_, end_; | |
bool open_; | |
}; | |
template<typename T> | |
struct restriction_traits | |
: iostreams::select< // Disambiguation for Tru64. | |
is_filter<T>, restricted_filter<T>, | |
is_direct<T>, restricted_direct_device<T>, | |
else_, restricted_indirect_device<T> | |
> | |
{ }; | |
} // End namespace detail. | |
template<typename T> | |
struct restriction : public detail::restriction_traits<T>::type { | |
typedef typename detail::param_type<T>::type param_type; | |
typedef typename detail::restriction_traits<T>::type base_type; | |
restriction(param_type t, stream_offset off, stream_offset len = -1) | |
: base_type(t, off, len) | |
{ } | |
}; | |
namespace detail { | |
//--------------Implementation of restricted_indirect_device------------------// | |
template<typename Device> | |
restricted_indirect_device<Device>::restricted_indirect_device | |
(param_type dev, stream_offset off, stream_offset len) | |
: device_adapter<Device>(dev), beg_(off), pos_(off), | |
end_(len != -1 ? off + len : -1) | |
{ | |
if (len < -1 || off < 0) | |
boost::throw_exception(BOOST_IOSTREAMS_FAILURE("bad offset")); | |
iostreams::skip(this->component(), off); | |
} | |
template<typename Device> | |
inline std::streamsize restricted_indirect_device<Device>::read | |
(char_type* s, std::streamsize n) | |
{ | |
using namespace std; | |
std::streamsize amt = | |
end_ != -1 ? | |
(std::min) (n, static_cast<std::streamsize>(end_ - pos_)) : | |
n; | |
std::streamsize result = iostreams::read(this->component(), s, amt); | |
if (result != -1) | |
pos_ += result; | |
return result; | |
} | |
template<typename Device> | |
inline std::streamsize restricted_indirect_device<Device>::write | |
(const char_type* s, std::streamsize n) | |
{ | |
if (end_ != -1 && pos_ + n >= end_) { | |
if(pos_ < end_) | |
pos_ += iostreams::write(this->component(), s, end_ - pos_); | |
boost::throw_exception(bad_write()); | |
} | |
std::streamsize result = iostreams::write(this->component(), s, n); | |
pos_ += result; | |
return result; | |
} | |
template<typename Device> | |
std::streampos restricted_indirect_device<Device>::seek | |
(stream_offset off, BOOST_IOS::seekdir way) | |
{ | |
stream_offset next; | |
if (way == BOOST_IOS::beg) { | |
next = beg_ + off; | |
} else if (way == BOOST_IOS::cur) { | |
next = pos_ + off; | |
} else if (end_ != -1) { | |
next = end_ + off; | |
} else { | |
// Restriction is half-open; seek relative to the actual end. | |
pos_ = iostreams::seek(this->component(), off, BOOST_IOS::end); | |
if (pos_ < beg_) | |
boost::throw_exception(bad_seek()); | |
return offset_to_position(pos_ - beg_); | |
} | |
if (next < beg_ || (end_ != -1 && next > end_)) | |
boost::throw_exception(bad_seek()); | |
pos_ = iostreams::seek(this->component(), next - pos_, BOOST_IOS::cur); | |
return offset_to_position(pos_ - beg_); | |
} | |
//--------------Implementation of restricted_direct_device--------------------// | |
template<typename Device> | |
restricted_direct_device<Device>::restricted_direct_device | |
(const Device& dev, stream_offset off, stream_offset len) | |
: device_adapter<Device>(dev), beg_(0), end_(0) | |
{ | |
std::pair<char_type*, char_type*> seq = | |
sequence(is_convertible<category, input>()); | |
if ( off < 0 || len < -1 || | |
(len != -1 && off + len > seq.second - seq.first) ) | |
{ | |
boost::throw_exception(BOOST_IOSTREAMS_FAILURE("bad offset")); | |
} | |
beg_ = seq.first + off; | |
end_ = len != -1 ? | |
seq.first + off + len : | |
seq.second; | |
} | |
template<typename Device> | |
typename restricted_direct_device<Device>::pair_type | |
restricted_direct_device<Device>::input_sequence() | |
{ | |
BOOST_STATIC_ASSERT((is_convertible<category, input>::value)); | |
return std::make_pair(beg_, end_); | |
} | |
template<typename Device> | |
typename restricted_direct_device<Device>::pair_type | |
restricted_direct_device<Device>::output_sequence() | |
{ | |
BOOST_STATIC_ASSERT((is_convertible<category, output>::value)); | |
return std::make_pair(beg_, end_); | |
} | |
template<typename Device> | |
typename restricted_direct_device<Device>::pair_type | |
restricted_direct_device<Device>::sequence(mpl::true_) | |
{ return iostreams::input_sequence(this->component()); } | |
template<typename Device> | |
typename restricted_direct_device<Device>::pair_type | |
restricted_direct_device<Device>::sequence(mpl::false_) | |
{ return iostreams::output_sequence(this->component()); } | |
//--------------Implementation of restricted_filter---------------------------// | |
template<typename Filter> | |
restricted_filter<Filter>::restricted_filter | |
(const Filter& flt, stream_offset off, stream_offset len) | |
: filter_adapter<Filter>(flt), beg_(off), | |
pos_(off), end_(len != -1 ? off + len : -1), open_(false) | |
{ | |
if (len < -1 || off < 0) | |
boost::throw_exception(BOOST_IOSTREAMS_FAILURE("bad offset")); | |
} | |
} // End namespace detail. | |
} } // End namespaces iostreams, boost. | |
#elif defined(BOOST_IOSTREAMS_RESTRICT) | |
namespace boost { namespace iostreams { | |
//--------------Implementation of restrict/slice------------------------------// | |
// Note: The following workarounds are patterned after resolve.hpp. It has not | |
// yet been confirmed that they are necessary. | |
# ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //------------------------// | |
# ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //------------------------------// | |
template<typename T> | |
restriction<T> | |
BOOST_IOSTREAMS_RESTRICT( const T& t, stream_offset off, stream_offset len = -1 | |
BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) ) | |
{ return restriction<T>(t, off, len); } | |
template<typename Ch, typename Tr> | |
restriction< std::basic_streambuf<Ch, Tr> > | |
BOOST_IOSTREAMS_RESTRICT( std::basic_streambuf<Ch, Tr>& sb, stream_offset off, | |
stream_offset len = -1 ) | |
{ return restriction< std::basic_streambuf<Ch, Tr> >(sb, off, len); } | |
template<typename Ch, typename Tr> | |
restriction< std::basic_istream<Ch, Tr> > | |
BOOST_IOSTREAMS_RESTRICT | |
(std::basic_istream<Ch, Tr>& is, stream_offset off, stream_offset len = -1) | |
{ return restriction< std::basic_istream<Ch, Tr> >(is, off, len); } | |
template<typename Ch, typename Tr> | |
restriction< std::basic_ostream<Ch, Tr> > | |
BOOST_IOSTREAMS_RESTRICT | |
(std::basic_ostream<Ch, Tr>& os, stream_offset off, stream_offset len = -1) | |
{ return restriction< std::basic_ostream<Ch, Tr> >(os, off, len); } | |
template<typename Ch, typename Tr> | |
restriction< std::basic_iostream<Ch, Tr> > | |
BOOST_IOSTREAMS_RESTRICT | |
(std::basic_iostream<Ch, Tr>& io, stream_offset off, stream_offset len = -1) | |
{ return restriction< std::basic_iostream<Ch, Tr> >(io, off, len); } | |
# else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------// | |
template<typename T> | |
restriction<T> | |
BOOST_IOSTREAMS_RESTRICT( const T& t, stream_offset off, stream_offset len = -1 | |
BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) ) | |
{ return restriction<T>(t, off, len); } | |
restriction<std::streambuf> | |
BOOST_IOSTREAMS_RESTRICT | |
(std::streambuf& sb, stream_offset off, stream_offset len = -1) | |
{ return restriction<std::streambuf>(sb, off, len); } | |
restriction<std::istream> | |
BOOST_IOSTREAMS_RESTRICT | |
(std::istream<Ch, Tr>& is, stream_offset off, stream_offset len = -1) | |
{ return restriction<std::istream>(is, off, len); } | |
restriction<std::ostream> | |
BOOST_IOSTREAMS_RESTRICT | |
(std::ostream<Ch, Tr>& os, stream_offset off, stream_offset len = -1) | |
{ return restriction<std::ostream>(os, off, len); } | |
restriction<std::iostream> | |
BOOST_IOSTREAMS_RESTRICT | |
(std::iostream<Ch, Tr>& io, stream_offset off, stream_offset len = -1) | |
{ return restriction<std::iostream>(io, off, len); } | |
# endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------// | |
# else // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //---------------// | |
template<typename T> | |
restriction<T> | |
BOOST_IOSTREAMS_RESTRICT | |
(const T& t, stream_offset off, stream_offset len, mpl::true_) | |
{ // Bad overload resolution. | |
return restriction<T>(const_cast<T&>(t, off, len)); | |
} | |
template<typename T> | |
restriction<T> | |
BOOST_IOSTREAMS_RESTRICT | |
(const T& t, stream_offset off, stream_offset len, mpl::false_) | |
{ return restriction<T>(t, off, len); } | |
template<typename T> | |
restriction<T> | |
BOOST_IOSTREAMS_RESTRICT( const T& t, stream_offset off, stream_offset len = -1 | |
BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) ) | |
{ return BOOST_IOSTREAMS_RESTRICT(t, off, len, is_std_io<T>()); } | |
# if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \ | |
!BOOST_WORKAROUND(BOOST_MSVC, <= 1300) && \ | |
!defined(__GNUC__) // ---------------------------------------------------// | |
template<typename T> | |
restriction<T> | |
BOOST_IOSTREAMS_RESTRICT(T& t, stream_offset off, stream_offset len = -1) | |
{ return restriction<T>(t, off, len); } | |
# endif // Borland 5.x, VC6-7.0 or GCC 2.9x //-------------------------------// | |
# endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //--------------// | |
} } // End namespaces iostreams, boost. | |
#endif // #if !defined(BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED) ... |