482 lines
17 KiB
C++
482 lines
17 KiB
C++
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/*
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* Distributed under the Boost Software License, Version 1.0.(See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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*
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* See http://www.boost.org/libs/iostreams for documentation.
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* File: boost/iostreams/detail/restrict_impl.hpp
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* Date: Sun Jan 06 12:57:30 MST 2008
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* Copyright: 2007-2008 CodeRage, LLC
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* Author: Jonathan Turkanis
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* Contact: turkanis at coderage dot com
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*
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* If included with the macro BOOST_IOSTREAMS_RESTRICT undefined, defines the
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* class template boost::iostreams::restriction. If included with the macro
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* BOOST_IOSTREAMS_RESTRICT defined as an identifier, defines the overloaded
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* function template boost::iostreams::BOOST_IOSTREAMS_RESTRICT, and object
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* generator for boost::iostreams::restriction.
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*
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* This design allows <boost/iostreams/restrict.hpp> and
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* <boost/iostreams/slice.hpp> to share an implementation.
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*/
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#if !defined(BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED) && \
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!defined(BOOST_IOSTREAMS_RESTRICT)
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# define BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED
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//------------------Implementation of restriction-----------------------------//
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# include <algorithm> // min.
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# include <utility> // pair.
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# include <boost/cstdint.hpp> // intmax_t.
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# include <boost/config.hpp> // DEDUCED_TYPENAME.
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# include <boost/iostreams/categories.hpp>
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# include <boost/iostreams/char_traits.hpp>
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# include <boost/iostreams/detail/adapter/device_adapter.hpp>
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# include <boost/iostreams/detail/adapter/filter_adapter.hpp>
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# include <boost/iostreams/detail/call_traits.hpp>
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# include <boost/iostreams/detail/enable_if_stream.hpp>
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# include <boost/iostreams/detail/error.hpp>
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# include <boost/iostreams/detail/ios.hpp> // failure.
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# include <boost/iostreams/detail/select.hpp>
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# include <boost/iostreams/operations.hpp>
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# include <boost/iostreams/skip.hpp>
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# include <boost/iostreams/traits.hpp> // mode_of, is_direct.
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# include <boost/mpl/bool.hpp>
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# include <boost/static_assert.hpp>
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# include <boost/throw_exception.hpp>
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# include <boost/type_traits/is_convertible.hpp>
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# include <boost/iostreams/detail/config/disable_warnings.hpp>
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namespace boost { namespace iostreams {
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namespace detail {
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//
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// Template name: restricted_indirect_device.
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// Description: Provides an restricted view of an indirect Device.
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// Template parameters:
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// Device - An indirect model of Device that models either Source or
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// SeekableDevice.
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//
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template<typename Device>
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class restricted_indirect_device : public device_adapter<Device> {
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private:
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typedef typename detail::param_type<Device>::type param_type;
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public:
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typedef typename char_type_of<Device>::type char_type;
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typedef typename mode_of<Device>::type mode;
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BOOST_STATIC_ASSERT(!(is_convertible<mode, detail::two_sequence>::value));
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struct category
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: mode,
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device_tag,
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closable_tag,
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flushable_tag,
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localizable_tag,
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optimally_buffered_tag
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{ };
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restricted_indirect_device( param_type dev, stream_offset off,
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stream_offset len = -1 );
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std::streamsize read(char_type* s, std::streamsize n);
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std::streamsize write(const char_type* s, std::streamsize n);
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std::streampos seek(stream_offset off, BOOST_IOS::seekdir way);
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private:
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stream_offset beg_, pos_, end_;
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};
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//
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// Template name: restricted_direct_device.
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// Description: Provides an restricted view of a Direct Device.
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// Template parameters:
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// Device - A model of Direct and Device.
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//
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template<typename Device>
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class restricted_direct_device : public device_adapter<Device> {
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public:
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typedef typename char_type_of<Device>::type char_type;
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typedef std::pair<char_type*, char_type*> pair_type;
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typedef typename mode_of<Device>::type mode;
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BOOST_STATIC_ASSERT(!(is_convertible<mode, detail::two_sequence>::value));
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struct category
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: mode_of<Device>::type,
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device_tag,
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direct_tag,
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closable_tag,
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localizable_tag
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{ };
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restricted_direct_device( const Device& dev, stream_offset off,
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stream_offset len = -1 );
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pair_type input_sequence();
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pair_type output_sequence();
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private:
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pair_type sequence(mpl::true_);
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pair_type sequence(mpl::false_);
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char_type *beg_, *end_;
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};
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//
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// Template name: restricted_filter.
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// Description: Provides an restricted view of a Filter.
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// Template parameters:
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// Filter - An indirect model of Filter.
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//
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template<typename Filter>
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class restricted_filter : public filter_adapter<Filter> {
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public:
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typedef typename char_type_of<Filter>::type char_type;
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typedef typename mode_of<Filter>::type mode;
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BOOST_STATIC_ASSERT(!(is_convertible<mode, detail::two_sequence>::value));
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struct category
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: mode,
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filter_tag,
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multichar_tag,
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closable_tag,
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localizable_tag,
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optimally_buffered_tag
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{ };
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restricted_filter( const Filter& flt, stream_offset off,
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stream_offset len = -1 );
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template<typename Source>
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std::streamsize read(Source& src, char_type* s, std::streamsize n)
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{
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using namespace std;
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if (!open_)
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open(src, BOOST_IOS::in);
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std::streamsize amt =
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end_ != -1 ?
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(std::min) (n, static_cast<std::streamsize>(end_ - pos_)) :
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n;
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std::streamsize result =
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iostreams::read(this->component(), src, s, amt);
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if (result != -1)
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pos_ += result;
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return result;
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}
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template<typename Sink>
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std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
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{
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if (!open_)
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open(snk, BOOST_IOS::out);
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if (end_ != -1 && pos_ + n >= end_) {
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if(pos_ < end_)
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pos_ += iostreams::write(this->component(),
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snk, s, end_ - pos_);
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boost::throw_exception(bad_write());
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}
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std::streamsize result =
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iostreams::write(this->component(), snk, s, n);
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pos_ += result;
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return result;
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}
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template<typename Device>
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std::streampos seek(Device& dev, stream_offset off, BOOST_IOS::seekdir way)
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{
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stream_offset next;
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if (way == BOOST_IOS::beg) {
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next = beg_ + off;
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} else if (way == BOOST_IOS::cur) {
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next = pos_ + off;
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} else if (end_ != -1) {
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next = end_ + off;
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} else {
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// Restriction is half-open; seek relative to the actual end.
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pos_ = this->component().seek(dev, off, BOOST_IOS::end);
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if (pos_ < beg_)
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boost::throw_exception(bad_seek());
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return offset_to_position(pos_ - beg_);
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}
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if (next < beg_ || (end_ != -1 && next >= end_))
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boost::throw_exception(bad_seek());
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pos_ = this->component().seek(dev, next, BOOST_IOS::cur);
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return offset_to_position(pos_ - beg_);
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}
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template<typename Device>
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void close(Device& dev)
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{
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open_ = false;
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detail::close_all(this->component(), dev);
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}
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template<typename Device>
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void close(Device& dev, BOOST_IOS::openmode which)
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{
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open_ = false;
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iostreams::close(this->component(), dev, which);
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}
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private:
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template<typename Device>
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void open(Device& dev, BOOST_IOS::openmode which)
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{
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typedef typename is_convertible<mode, dual_use>::type is_dual_use;
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open_ = true;
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which = is_dual_use() ? which : (BOOST_IOS::in | BOOST_IOS::out);
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iostreams::skip(this->component(), dev, beg_, which);
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}
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stream_offset beg_, pos_, end_;
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bool open_;
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};
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template<typename T>
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struct restriction_traits
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: iostreams::select< // Disambiguation for Tru64.
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is_filter<T>, restricted_filter<T>,
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is_direct<T>, restricted_direct_device<T>,
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else_, restricted_indirect_device<T>
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>
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{ };
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} // End namespace detail.
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template<typename T>
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struct restriction : public detail::restriction_traits<T>::type {
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typedef typename detail::param_type<T>::type param_type;
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typedef typename detail::restriction_traits<T>::type base_type;
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restriction(param_type t, stream_offset off, stream_offset len = -1)
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: base_type(t, off, len)
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{ }
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};
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namespace detail {
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//--------------Implementation of restricted_indirect_device------------------//
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template<typename Device>
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restricted_indirect_device<Device>::restricted_indirect_device
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(param_type dev, stream_offset off, stream_offset len)
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: device_adapter<Device>(dev), beg_(off), pos_(off),
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end_(len != -1 ? off + len : -1)
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{
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if (len < -1 || off < 0)
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boost::throw_exception(BOOST_IOSTREAMS_FAILURE("bad offset"));
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iostreams::skip(this->component(), off);
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}
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template<typename Device>
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inline std::streamsize restricted_indirect_device<Device>::read
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(char_type* s, std::streamsize n)
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{
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using namespace std;
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std::streamsize amt =
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end_ != -1 ?
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(std::min) (n, static_cast<std::streamsize>(end_ - pos_)) :
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n;
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std::streamsize result = iostreams::read(this->component(), s, amt);
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if (result != -1)
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pos_ += result;
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return result;
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}
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template<typename Device>
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inline std::streamsize restricted_indirect_device<Device>::write
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(const char_type* s, std::streamsize n)
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{
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if (end_ != -1 && pos_ + n >= end_) {
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if(pos_ < end_)
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pos_ += iostreams::write(this->component(), s, end_ - pos_);
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boost::throw_exception(bad_write());
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}
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std::streamsize result = iostreams::write(this->component(), s, n);
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pos_ += result;
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return result;
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}
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template<typename Device>
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std::streampos restricted_indirect_device<Device>::seek
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(stream_offset off, BOOST_IOS::seekdir way)
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{
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stream_offset next;
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if (way == BOOST_IOS::beg) {
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next = beg_ + off;
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} else if (way == BOOST_IOS::cur) {
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next = pos_ + off;
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} else if (end_ != -1) {
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next = end_ + off;
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} else {
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// Restriction is half-open; seek relative to the actual end.
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pos_ = iostreams::seek(this->component(), off, BOOST_IOS::end);
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if (pos_ < beg_)
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boost::throw_exception(bad_seek());
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return offset_to_position(pos_ - beg_);
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}
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if (next < beg_ || (end_ != -1 && next > end_))
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boost::throw_exception(bad_seek());
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pos_ = iostreams::seek(this->component(), next - pos_, BOOST_IOS::cur);
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return offset_to_position(pos_ - beg_);
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}
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//--------------Implementation of restricted_direct_device--------------------//
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template<typename Device>
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restricted_direct_device<Device>::restricted_direct_device
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(const Device& dev, stream_offset off, stream_offset len)
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: device_adapter<Device>(dev), beg_(0), end_(0)
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{
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std::pair<char_type*, char_type*> seq =
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sequence(is_convertible<category, input>());
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if ( off < 0 || len < -1 ||
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(len != -1 && off + len > seq.second - seq.first) )
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{
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boost::throw_exception(BOOST_IOSTREAMS_FAILURE("bad offset"));
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}
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beg_ = seq.first + off;
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end_ = len != -1 ?
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seq.first + off + len :
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seq.second;
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}
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template<typename Device>
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typename restricted_direct_device<Device>::pair_type
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restricted_direct_device<Device>::input_sequence()
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{
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BOOST_STATIC_ASSERT((is_convertible<category, input>::value));
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return std::make_pair(beg_, end_);
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}
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template<typename Device>
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typename restricted_direct_device<Device>::pair_type
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restricted_direct_device<Device>::output_sequence()
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{
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BOOST_STATIC_ASSERT((is_convertible<category, output>::value));
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return std::make_pair(beg_, end_);
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}
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template<typename Device>
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typename restricted_direct_device<Device>::pair_type
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restricted_direct_device<Device>::sequence(mpl::true_)
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{ return iostreams::input_sequence(this->component()); }
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template<typename Device>
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typename restricted_direct_device<Device>::pair_type
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restricted_direct_device<Device>::sequence(mpl::false_)
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{ return iostreams::output_sequence(this->component()); }
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//--------------Implementation of restricted_filter---------------------------//
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template<typename Filter>
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restricted_filter<Filter>::restricted_filter
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(const Filter& flt, stream_offset off, stream_offset len)
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: 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) && \
|
||
|
|
!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 or GCC //-------------------------------//
|
||
|
|
# endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //--------------//
|
||
|
|
|
||
|
|
} } // End namespaces iostreams, boost.
|
||
|
|
|
||
|
|
#endif // #if !defined(BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED) ...
|