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230 lines
7.3 KiB
230 lines
7.3 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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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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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_BUFFERS_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_BUFFERS_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <algorithm> // swap.
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#include <memory> // allocator.
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#include <boost/config.hpp> // member templates.
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#include <boost/iostreams/char_traits.hpp>
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#include <boost/iostreams/detail/ios.hpp> // streamsize.
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#include <boost/iostreams/read.hpp>
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#include <boost/iostreams/traits.hpp> // int_type_of.
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#include <boost/iostreams/checked_operations.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost { namespace iostreams { namespace detail {
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//----------------Buffers-----------------------------------------------------//
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//
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// Template name: buffer
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// Description: Character buffer.
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// Template parameters:
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// Ch - The character type.
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// Alloc - The Allocator type.
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//
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template< typename Ch,
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typename Alloc = std::allocator<Ch> >
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class basic_buffer {
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private:
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#ifndef BOOST_NO_STD_ALLOCATOR
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#if defined(BOOST_NO_CXX11_ALLOCATOR)
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typedef typename Alloc::template rebind<Ch>::other allocator_type;
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#else
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typedef typename std::allocator_traits<Alloc>::template rebind_alloc<Ch> allocator_type;
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typedef std::allocator_traits<allocator_type> allocator_traits;
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#endif
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#else
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typedef std::allocator<Ch> allocator_type;
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#endif
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static Ch* allocate(std::streamsize buffer_size);
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public:
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basic_buffer();
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basic_buffer(std::streamsize buffer_size);
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~basic_buffer();
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void resize(std::streamsize buffer_size);
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Ch* begin() const { return buf_; }
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Ch* end() const { return buf_ + size_; }
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Ch* data() const { return buf_; }
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std::streamsize size() const { return size_; }
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void swap(basic_buffer& rhs);
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private:
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// Disallow copying and assignment.
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basic_buffer(const basic_buffer&);
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basic_buffer& operator=(const basic_buffer&);
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Ch* buf_;
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std::streamsize size_;
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};
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template<typename Ch, typename Alloc>
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void swap(basic_buffer<Ch, Alloc>& lhs, basic_buffer<Ch, Alloc>& rhs)
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{ lhs.swap(rhs); }
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//
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// Template name: buffer
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// Description: Character buffer with two pointers accessible via ptr() and
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// eptr().
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// Template parameters:
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// Ch - A character type.
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//
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template< typename Ch,
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typename Alloc = std::allocator<Ch> >
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class buffer : public basic_buffer<Ch, Alloc> {
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private:
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typedef basic_buffer<Ch, Alloc> base;
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public:
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typedef iostreams::char_traits<Ch> traits_type;
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using base::resize;
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using base::data;
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using base::size;
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typedef Ch* const const_pointer;
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buffer(std::streamsize buffer_size);
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Ch* & ptr() { return ptr_; }
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const_pointer& ptr() const { return ptr_; }
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Ch* & eptr() { return eptr_; }
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const_pointer& eptr() const { return eptr_; }
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void set(std::streamsize ptr, std::streamsize end);
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void swap(buffer& rhs);
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// Returns an int_type as a status code.
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template<typename Source>
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typename int_type_of<Source>::type fill(Source& src)
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{
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using namespace std;
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std::streamsize keep;
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if ((keep = static_cast<std::streamsize>(eptr_ - ptr_)) > 0)
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traits_type::move(
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this->data(),
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ptr_,
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static_cast<size_t>(keep)
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);
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set(0, keep);
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std::streamsize result =
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iostreams::read(src, this->data() + keep, this->size() - keep);
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if (result != -1)
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this->set(0, keep + result);
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return result == -1 ?
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traits_type::eof() :
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result == 0 ?
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traits_type::would_block() :
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traits_type::good();
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}
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// Returns true if one or more characters were written.
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template<typename Sink>
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bool flush(Sink& dest)
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{
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using namespace std;
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std::streamsize amt = static_cast<std::streamsize>(eptr_ - ptr_);
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std::streamsize result = iostreams::write_if(dest, ptr_, amt);
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if (result < amt) {
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traits_type::move( this->data(),
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ptr_ + static_cast<size_t>(result),
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static_cast<size_t>(amt - result) );
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}
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this->set(0, amt - result);
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return result != 0;
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}
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private:
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Ch *ptr_, *eptr_;
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};
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template<typename Ch, typename Alloc>
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void swap(buffer<Ch, Alloc>& lhs, buffer<Ch, Alloc>& rhs)
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{ lhs.swap(rhs); }
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//--------------Implementation of basic_buffer--------------------------------//
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template<typename Ch, typename Alloc>
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basic_buffer<Ch, Alloc>::basic_buffer() : buf_(0), size_(0) { }
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template<typename Ch, typename Alloc>
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inline Ch* basic_buffer<Ch, Alloc>::allocate(std::streamsize buffer_size)
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{
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#if defined(BOOST_NO_CXX11_ALLOCATOR) || defined(BOOST_NO_STD_ALLOCATOR)
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return static_cast<Ch*>(allocator_type().allocate(
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static_cast<BOOST_DEDUCED_TYPENAME Alloc::size_type>(buffer_size), 0));
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#else
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allocator_type alloc;
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return static_cast<Ch*>(allocator_traits::allocate(alloc,
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static_cast<BOOST_DEDUCED_TYPENAME allocator_traits::size_type>(buffer_size)));
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#endif
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}
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template<typename Ch, typename Alloc>
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basic_buffer<Ch, Alloc>::basic_buffer(std::streamsize buffer_size)
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: buf_(allocate(buffer_size)),
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size_(buffer_size) // Cast for SunPro 5.3.
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{ }
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template<typename Ch, typename Alloc>
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inline basic_buffer<Ch, Alloc>::~basic_buffer()
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{
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if (buf_) {
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#if defined(BOOST_NO_CXX11_ALLOCATOR) || defined(BOOST_NO_STD_ALLOCATOR)
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allocator_type().deallocate(buf_,
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static_cast<BOOST_DEDUCED_TYPENAME Alloc::size_type>(size_));
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#else
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allocator_type alloc;
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allocator_traits::deallocate(alloc, buf_,
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static_cast<BOOST_DEDUCED_TYPENAME allocator_traits::size_type>(size_));
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#endif
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}
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}
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template<typename Ch, typename Alloc>
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inline void basic_buffer<Ch, Alloc>::resize(std::streamsize buffer_size)
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{
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if (size_ != buffer_size) {
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basic_buffer<Ch, Alloc> temp(buffer_size);
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std::swap(size_, temp.size_);
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std::swap(buf_, temp.buf_);
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}
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}
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template<typename Ch, typename Alloc>
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void basic_buffer<Ch, Alloc>::swap(basic_buffer& rhs)
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{
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std::swap(buf_, rhs.buf_);
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std::swap(size_, rhs.size_);
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}
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//--------------Implementation of buffer--------------------------------------//
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template<typename Ch, typename Alloc>
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buffer<Ch, Alloc>::buffer(std::streamsize buffer_size)
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: basic_buffer<Ch, Alloc>(buffer_size), ptr_(data()), eptr_(data() + buffer_size) { }
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template<typename Ch, typename Alloc>
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inline void buffer<Ch, Alloc>::set(std::streamsize ptr, std::streamsize end)
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{
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ptr_ = data() + ptr;
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eptr_ = data() + end;
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}
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template<typename Ch, typename Alloc>
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inline void buffer<Ch, Alloc>::swap(buffer& rhs)
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{
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base::swap(rhs);
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std::swap(ptr_, rhs.ptr_);
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std::swap(eptr_, rhs.eptr_);
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}
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//----------------------------------------------------------------------------//
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} } } // End namespaces detail, iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_BUFFERS_HPP_INCLUDED
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