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482 lines
16 KiB
482 lines
16 KiB
/* |
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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 paramters: |
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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 paramters: |
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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 paramters: |
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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), |
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pos_(off), end_(len != -1 ? off + len : -1), open_(false) |
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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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} |
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} // End namespace detail. |
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} } // End namespaces iostreams, boost. |
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#elif defined(BOOST_IOSTREAMS_RESTRICT) |
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namespace boost { namespace iostreams { |
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//--------------Implementation of restrict/slice------------------------------// |
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// Note: The following workarounds are patterned after resolve.hpp. It has not |
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// yet been confirmed that they are necessary. |
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# ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //------------------------// |
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# ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //------------------------------// |
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template<typename T> |
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restriction<T> |
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BOOST_IOSTREAMS_RESTRICT( const T& t, stream_offset off, stream_offset len = -1 |
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) ) |
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{ return restriction<T>(t, off, len); } |
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template<typename Ch, typename Tr> |
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restriction< std::basic_streambuf<Ch, Tr> > |
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BOOST_IOSTREAMS_RESTRICT( std::basic_streambuf<Ch, Tr>& sb, stream_offset off, |
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stream_offset len = -1 ) |
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{ return restriction< std::basic_streambuf<Ch, Tr> >(sb, off, len); } |
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template<typename Ch, typename Tr> |
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restriction< std::basic_istream<Ch, Tr> > |
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BOOST_IOSTREAMS_RESTRICT |
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(std::basic_istream<Ch, Tr>& is, stream_offset off, stream_offset len = -1) |
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{ return restriction< std::basic_istream<Ch, Tr> >(is, off, len); } |
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template<typename Ch, typename Tr> |
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restriction< std::basic_ostream<Ch, Tr> > |
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BOOST_IOSTREAMS_RESTRICT |
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(std::basic_ostream<Ch, Tr>& os, stream_offset off, stream_offset len = -1) |
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{ return restriction< std::basic_ostream<Ch, Tr> >(os, off, len); } |
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template<typename Ch, typename Tr> |
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restriction< std::basic_iostream<Ch, Tr> > |
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BOOST_IOSTREAMS_RESTRICT |
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(std::basic_iostream<Ch, Tr>& io, stream_offset off, stream_offset len = -1) |
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{ return restriction< std::basic_iostream<Ch, Tr> >(io, off, len); } |
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# else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------// |
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template<typename T> |
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restriction<T> |
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BOOST_IOSTREAMS_RESTRICT( const T& t, stream_offset off, stream_offset len = -1 |
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) ) |
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{ return restriction<T>(t, off, len); } |
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restriction<std::streambuf> |
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BOOST_IOSTREAMS_RESTRICT |
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(std::streambuf& sb, stream_offset off, stream_offset len = -1) |
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{ return restriction<std::streambuf>(sb, off, len); } |
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restriction<std::istream> |
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BOOST_IOSTREAMS_RESTRICT |
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(std::istream<Ch, Tr>& is, stream_offset off, stream_offset len = -1) |
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{ return restriction<std::istream>(is, off, len); } |
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restriction<std::ostream> |
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BOOST_IOSTREAMS_RESTRICT |
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(std::ostream<Ch, Tr>& os, stream_offset off, stream_offset len = -1) |
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{ return restriction<std::ostream>(os, off, len); } |
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restriction<std::iostream> |
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BOOST_IOSTREAMS_RESTRICT |
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(std::iostream<Ch, Tr>& io, stream_offset off, stream_offset len = -1) |
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{ return restriction<std::iostream>(io, off, len); } |
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# endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------// |
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# else // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //---------------// |
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template<typename T> |
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restriction<T> |
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BOOST_IOSTREAMS_RESTRICT |
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(const T& t, stream_offset off, stream_offset len, mpl::true_) |
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{ // Bad overload resolution. |
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return restriction<T>(const_cast<T&>(t, off, len)); |
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} |
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template<typename T> |
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restriction<T> |
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BOOST_IOSTREAMS_RESTRICT |
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(const T& t, stream_offset off, stream_offset len, mpl::false_) |
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{ return restriction<T>(t, off, len); } |
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template<typename T> |
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restriction<T> |
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BOOST_IOSTREAMS_RESTRICT( const T& t, stream_offset off, stream_offset len = -1 |
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) ) |
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{ return BOOST_IOSTREAMS_RESTRICT(t, off, len, is_std_io<T>()); } |
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# if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \ |
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!BOOST_WORKAROUND(BOOST_MSVC, <= 1300) && \ |
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!defined(__GNUC__) // ---------------------------------------------------// |
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template<typename T> |
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restriction<T> |
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BOOST_IOSTREAMS_RESTRICT(T& t, stream_offset off, stream_offset len = -1) |
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{ return restriction<T>(t, off, len); } |
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# endif // Borland 5.x, VC6-7.0 or GCC 2.9x //-------------------------------// |
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# endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //--------------// |
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} } // End namespaces iostreams, boost. |
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#endif // #if !defined(BOOST_IOSTREAMS_RESTRICT_IMPL_HPP_INCLUDED) ...
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