1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/iostreams/detail/buffer.hpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,199 @@
1.4 +// (C) Copyright Jonathan Turkanis 2003-5.
1.5 +// Distributed under the Boost Software License, Version 1.0. (See accompanying
1.6 +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
1.7 +
1.8 +// See http://www.boost.org/libs/iostreams for documentation.
1.9 +
1.10 +#ifndef BOOST_IOSTREAMS_DETAIL_BUFFERS_HPP_INCLUDED
1.11 +#define BOOST_IOSTREAMS_DETAIL_BUFFERS_HPP_INCLUDED
1.12 +
1.13 +#if defined(_MSC_VER) && (_MSC_VER >= 1020)
1.14 +# pragma once
1.15 +#endif
1.16 +
1.17 +#include <algorithm> // swap.
1.18 +#include <memory> // allocator.
1.19 +#include <boost/config.hpp> // member templates.
1.20 +#include <boost/iostreams/char_traits.hpp>
1.21 +#include <boost/iostreams/detail/ios.hpp> // streamsize.
1.22 +#include <boost/iostreams/read.hpp>
1.23 +#include <boost/iostreams/traits.hpp> // int_type_of.
1.24 +#include <boost/iostreams/checked_operations.hpp>
1.25 +#include <boost/mpl/if.hpp>
1.26 +#include <boost/type_traits/is_same.hpp>
1.27 +
1.28 +namespace boost { namespace iostreams { namespace detail {
1.29 +
1.30 +//----------------Buffers-----------------------------------------------------//
1.31 +
1.32 +//
1.33 +// Template name: buffer
1.34 +// Description: Character buffer.
1.35 +// Template paramters:
1.36 +// Ch - The character type.
1.37 +// Alloc - The Allocator type.
1.38 +//
1.39 +template< typename Ch,
1.40 + typename Alloc = std::allocator<Ch> >
1.41 +class basic_buffer {
1.42 +private:
1.43 +#ifndef BOOST_NO_STD_ALLOCATOR
1.44 + typedef typename Alloc::template rebind<Ch>::other allocator_type;
1.45 +#else
1.46 + typedef std::allocator<Ch> allocator_type;
1.47 +#endif
1.48 +public:
1.49 + basic_buffer();
1.50 + basic_buffer(int buffer_size);
1.51 + ~basic_buffer();
1.52 + void resize(int buffer_size);
1.53 + Ch* begin() const { return buf_; }
1.54 + Ch* end() const { return buf_ + size_; }
1.55 + Ch* data() const { return buf_; }
1.56 + std::streamsize size() const { return size_; }
1.57 + void swap(basic_buffer& rhs);
1.58 +private:
1.59 + // Disallow copying and assignment.
1.60 + basic_buffer(const basic_buffer&);
1.61 + basic_buffer& operator=(const basic_buffer&);
1.62 + Ch* buf_;
1.63 + std::streamsize size_;
1.64 +};
1.65 +
1.66 +template<typename Ch, typename Alloc>
1.67 +void swap(basic_buffer<Ch, Alloc>& lhs, basic_buffer<Ch, Alloc>& rhs)
1.68 +{ lhs.swap(rhs); }
1.69 +
1.70 +//
1.71 +// Template name: buffer
1.72 +// Description: Character buffer with two pointers accessible via ptr() and
1.73 +// eptr().
1.74 +// Template paramters:
1.75 +// Ch - A character type.
1.76 +//
1.77 +template< typename Ch,
1.78 + typename Alloc = std::allocator<Ch> >
1.79 +class buffer : public basic_buffer<Ch, Alloc> {
1.80 +private:
1.81 + typedef basic_buffer<Ch, Alloc> base;
1.82 +public:
1.83 + typedef iostreams::char_traits<Ch> traits_type;
1.84 + using base::resize;
1.85 + using base::data;
1.86 + using base::size;
1.87 + typedef Ch* const const_pointer;
1.88 + buffer(int buffer_size);
1.89 + Ch* & ptr() { return ptr_; }
1.90 + const_pointer& ptr() const { return ptr_; }
1.91 + Ch* & eptr() { return eptr_; }
1.92 + const_pointer& eptr() const { return eptr_; }
1.93 + void set(std::streamsize ptr, std::streamsize end);
1.94 + void swap(buffer& rhs);
1.95 +
1.96 + // Returns an int_type as a status code.
1.97 + template<typename Source>
1.98 + typename int_type_of<Source>::type fill(Source& src)
1.99 + {
1.100 + using namespace std;
1.101 + streamsize keep;
1.102 + if ((keep = static_cast<streamsize>(eptr_ - ptr_)) > 0)
1.103 + traits_type::move(this->data(), ptr_, keep);
1.104 + set(0, keep);
1.105 + streamsize result =
1.106 + iostreams::read(src, this->data() + keep, this->size() - keep);
1.107 + if (result != -1)
1.108 + this->set(0, keep + result);
1.109 + //return result == this->size() - keep ?
1.110 + // traits_type::good() :
1.111 + // keep == -1 ?
1.112 + // traits_type::eof() :
1.113 + // traits_type::would_block();
1.114 + return result == -1 ?
1.115 + traits_type::eof() :
1.116 + result == 0 ?
1.117 + traits_type::would_block() :
1.118 + traits_type::good();
1.119 +
1.120 + }
1.121 +
1.122 + // Returns true if one or more characters were written.
1.123 + template<typename Sink>
1.124 + bool flush(Sink& dest)
1.125 + {
1.126 + using namespace std;
1.127 + streamsize amt = static_cast<std::streamsize>(eptr_ - ptr_);
1.128 + streamsize result = iostreams::write_if(dest, ptr_, amt);
1.129 + if (result < amt) {
1.130 + traits_type::move( this->data(),
1.131 + ptr_ + result,
1.132 + amt - result );
1.133 + }
1.134 + this->set(0, amt - result);
1.135 + return result != 0;
1.136 + }
1.137 +private:
1.138 + Ch *ptr_, *eptr_;
1.139 +};
1.140 +
1.141 +template<typename Ch, typename Alloc>
1.142 +void swap(buffer<Ch, Alloc>& lhs, buffer<Ch, Alloc>& rhs)
1.143 +{ lhs.swap(rhs); }
1.144 +
1.145 +//--------------Implementation of basic_buffer--------------------------------//
1.146 +
1.147 +template<typename Ch, typename Alloc>
1.148 +basic_buffer<Ch, Alloc>::basic_buffer() : buf_(0), size_(0) { }
1.149 +
1.150 +template<typename Ch, typename Alloc>
1.151 +basic_buffer<Ch, Alloc>::basic_buffer(int buffer_size)
1.152 + : buf_(static_cast<Ch*>(allocator_type().allocate(buffer_size, 0))),
1.153 + size_(buffer_size) // Cast for SunPro 5.3.
1.154 + { }
1.155 +
1.156 +template<typename Ch, typename Alloc>
1.157 +inline basic_buffer<Ch, Alloc>::~basic_buffer()
1.158 +{ if (buf_) allocator_type().deallocate(buf_, size_); }
1.159 +
1.160 +template<typename Ch, typename Alloc>
1.161 +inline void basic_buffer<Ch, Alloc>::resize(int buffer_size)
1.162 +{
1.163 + if (size_ != buffer_size) {
1.164 + basic_buffer<Ch, Alloc> temp(buffer_size);
1.165 + std::swap(size_, temp.size_);
1.166 + std::swap(buf_, temp.buf_);
1.167 + }
1.168 +}
1.169 +
1.170 +template<typename Ch, typename Alloc>
1.171 +void basic_buffer<Ch, Alloc>::swap(basic_buffer& rhs)
1.172 +{
1.173 + std::swap(buf_, rhs.buf_);
1.174 + std::swap(size_, rhs.size_);
1.175 +}
1.176 +
1.177 +//--------------Implementation of buffer--------------------------------------//
1.178 +
1.179 +template<typename Ch, typename Alloc>
1.180 +buffer<Ch, Alloc>::buffer(int buffer_size)
1.181 + : basic_buffer<Ch, Alloc>(buffer_size) { }
1.182 +
1.183 +template<typename Ch, typename Alloc>
1.184 +inline void buffer<Ch, Alloc>::set(std::streamsize ptr, std::streamsize end)
1.185 +{
1.186 + ptr_ = data() + ptr;
1.187 + eptr_ = data() + end;
1.188 +}
1.189 +
1.190 +template<typename Ch, typename Alloc>
1.191 +inline void buffer<Ch, Alloc>::swap(buffer& rhs)
1.192 +{
1.193 + base::swap(rhs);
1.194 + std::swap(ptr_, rhs.ptr_);
1.195 + std::swap(eptr_, rhs.eptr_);
1.196 +}
1.197 +
1.198 +//----------------------------------------------------------------------------//
1.199 +
1.200 +} } } // End namespaces detail, iostreams, boost.
1.201 +
1.202 +#endif // #ifndef BOOST_IOSTREAMS_DETAIL_BUFFERS_HPP_INCLUDED