1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/iostreams/read.hpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,246 @@
1.4 +// (C) Copyright Jonathan Turkanis 2005.
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_READ_HPP_INCLUDED
1.11 +#define BOOST_IOSTREAMS_READ_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 <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
1.18 +#include <boost/detail/workaround.hpp>
1.19 +#include <boost/iostreams/char_traits.hpp>
1.20 +#include <boost/iostreams/detail/char_traits.hpp>
1.21 +#include <boost/iostreams/detail/dispatch.hpp>
1.22 +#include <boost/iostreams/detail/ios.hpp> // streamsize.
1.23 +#include <boost/iostreams/detail/streambuf.hpp>
1.24 +#include <boost/iostreams/detail/wrap_unwrap.hpp>
1.25 +#include <boost/iostreams/operations_fwd.hpp>
1.26 +#include <boost/mpl/if.hpp>
1.27 +
1.28 +// Must come last.
1.29 +#include <boost/iostreams/detail/config/disable_warnings.hpp>
1.30 +
1.31 +#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-----------------------------------//
1.32 +# include <boost/iostreams/detail/vc6/read.hpp>
1.33 +#else // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //--------------------------//
1.34 +
1.35 +namespace boost { namespace iostreams {
1.36 +
1.37 +namespace detail {
1.38 +
1.39 +template<typename T>
1.40 +struct read_device_impl;
1.41 +
1.42 +template<typename T>
1.43 +struct read_filter_impl;
1.44 +
1.45 +} // End namespace detail.
1.46 +
1.47 +template<typename T>
1.48 +typename int_type_of<T>::type get(T& t)
1.49 +{ return detail::read_device_impl<T>::get(detail::unwrap(t)); }
1.50 +
1.51 +template<typename T>
1.52 +inline std::streamsize
1.53 +read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
1.54 +{ return detail::read_device_impl<T>::read(detail::unwrap(t), s, n); }
1.55 +
1.56 +template<typename T, typename Source>
1.57 +std::streamsize
1.58 +read(T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n)
1.59 +{ return detail::read_filter_impl<T>::read(detail::unwrap(t), src, s, n); }
1.60 +
1.61 +template<typename T>
1.62 +bool putback(T& t, typename char_type_of<T>::type c)
1.63 +{ return detail::read_device_impl<T>::putback(detail::unwrap(t), c); }
1.64 +
1.65 +//----------------------------------------------------------------------------//
1.66 +
1.67 +namespace detail {
1.68 +
1.69 +// Helper function for adding -1 as EOF indicator.
1.70 +inline std::streamsize check_eof(std::streamsize n) { return n != 0 ? n : -1; }
1.71 +
1.72 +// Helper templates for reading from streambufs.
1.73 +template<bool IsLinked>
1.74 +struct true_eof_impl;
1.75 +
1.76 +template<>
1.77 +struct true_eof_impl<true> {
1.78 + template<typename T>
1.79 + static bool true_eof(T& t) { return t.true_eof(); }
1.80 +};
1.81 +
1.82 +template<>
1.83 +struct true_eof_impl<false> {
1.84 + template<typename T>
1.85 + static bool true_eof(T& t) { return true; }
1.86 +};
1.87 +
1.88 +template<typename T>
1.89 +inline bool true_eof(T& t)
1.90 +{
1.91 + const bool linked = is_linked<T>::value;
1.92 + return true_eof_impl<linked>::true_eof(t);
1.93 +}
1.94 +
1.95 +//------------------Definition of read_device_impl----------------------------//
1.96 +
1.97 +template<typename T>
1.98 +struct read_device_impl
1.99 + : mpl::if_<
1.100 + detail::is_custom<T>,
1.101 + operations<T>,
1.102 + read_device_impl<
1.103 + BOOST_DEDUCED_TYPENAME
1.104 + detail::dispatch<
1.105 + T, istream_tag, streambuf_tag, input
1.106 + >::type
1.107 + >
1.108 + >::type
1.109 + { };
1.110 +
1.111 +template<>
1.112 +struct read_device_impl<istream_tag> {
1.113 + template<typename T>
1.114 + static typename int_type_of<T>::type get(T& t)
1.115 + { return t.get(); }
1.116 +
1.117 + template<typename T>
1.118 + static std::streamsize
1.119 + read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
1.120 + { return check_eof(t.rdbuf()->sgetn(s, n)); }
1.121 +
1.122 + template<typename T>
1.123 + static bool putback(T& t, typename char_type_of<T>::type c)
1.124 + {
1.125 + typedef typename char_type_of<T>::type char_type;
1.126 + typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type;
1.127 + return !traits_type::eq_int_type( t.rdbuf()->sputbackc(c),
1.128 + traits_type::eof() );
1.129 + }
1.130 +};
1.131 +
1.132 +template<>
1.133 +struct read_device_impl<streambuf_tag> {
1.134 + template<typename T>
1.135 + static typename int_type_of<T>::type
1.136 + get(T& t)
1.137 + { // gcc 2.95 needs namespace qualification for char_traits.
1.138 + typedef typename char_type_of<T>::type char_type;
1.139 + typedef iostreams::char_traits<char_type> traits_type;
1.140 + typename int_type_of<T>::type c;
1.141 + return !traits_type::is_eof(c = t.sbumpc()) ||
1.142 + detail::true_eof(t)
1.143 + ?
1.144 + c : traits_type::would_block();
1.145 + }
1.146 +
1.147 + template<typename T>
1.148 + static std::streamsize
1.149 + read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
1.150 + {
1.151 + std::streamsize amt;
1.152 + return (amt = t.sgetn(s, n)) != 0 ?
1.153 + amt :
1.154 + detail::true_eof(t) ?
1.155 + -1 :
1.156 + 0;
1.157 + }
1.158 +
1.159 + template<typename T>
1.160 + static bool putback(T& t, typename char_type_of<T>::type c)
1.161 + { // gcc 2.95 needs namespace qualification for char_traits.
1.162 + typedef typename char_type_of<T>::type char_type;
1.163 + typedef iostreams::char_traits<char_type> traits_type;
1.164 + return !traits_type::is_eof(t.sputbackc(c));
1.165 + }
1.166 +};
1.167 +
1.168 +template<>
1.169 +struct read_device_impl<input> {
1.170 + template<typename T>
1.171 + static typename int_type_of<T>::type
1.172 + get(T& t)
1.173 + { // gcc 2.95 needs namespace qualification for char_traits.
1.174 + typedef typename char_type_of<T>::type char_type;
1.175 + typedef iostreams::char_traits<char_type> traits_type;
1.176 + char_type c;
1.177 + std::streamsize amt;
1.178 + return (amt = t.read(&c, 1)) == 1 ?
1.179 + traits_type::to_int_type(c) :
1.180 + amt == -1 ?
1.181 + traits_type::eof() :
1.182 + traits_type::would_block();
1.183 + }
1.184 +
1.185 + template<typename T>
1.186 + static std::streamsize
1.187 + read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
1.188 + { return t.read(s, n); }
1.189 +
1.190 + template<typename T>
1.191 + static bool putback(T& t, typename char_type_of<T>::type c)
1.192 + { // T must be Peekable.
1.193 + return t.putback(c);
1.194 + }
1.195 +};
1.196 +
1.197 +//------------------Definition of read_filter_impl----------------------------//
1.198 +
1.199 +template<typename T>
1.200 +struct read_filter_impl
1.201 + : mpl::if_<
1.202 + detail::is_custom<T>,
1.203 + operations<T>,
1.204 + read_filter_impl<
1.205 + BOOST_DEDUCED_TYPENAME
1.206 + detail::dispatch<
1.207 + T, multichar_tag, any_tag
1.208 + >::type
1.209 + >
1.210 + >::type
1.211 + { };
1.212 +
1.213 +template<>
1.214 +struct read_filter_impl<multichar_tag> {
1.215 + template<typename T, typename Source>
1.216 + static std::streamsize read
1.217 + (T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n)
1.218 + { return t.read(src, s, n); }
1.219 +};
1.220 +
1.221 +template<>
1.222 +struct read_filter_impl<any_tag> {
1.223 + template<typename T, typename Source>
1.224 + static std::streamsize read
1.225 + (T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n)
1.226 + { // gcc 2.95 needs namespace qualification for char_traits.
1.227 + typedef typename char_type_of<T>::type char_type;
1.228 + typedef iostreams::char_traits<char_type> traits_type;
1.229 + for (std::streamsize off = 0; off < n; ++off) {
1.230 + typename traits_type::int_type c = t.get(src);
1.231 + if (traits_type::is_eof(c))
1.232 + return check_eof(off);
1.233 + if (traits_type::would_block(c))
1.234 + return off;
1.235 + s[off] = traits_type::to_char_type(c);
1.236 + }
1.237 + return n;
1.238 + }
1.239 +};
1.240 +
1.241 +} // End namespace detail.
1.242 +
1.243 +} } // End namespaces iostreams, boost.
1.244 +
1.245 +#endif // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-------------------------//
1.246 +
1.247 +#include <boost/iostreams/detail/config/enable_warnings.hpp>
1.248 +
1.249 +#endif // #ifndef BOOST_IOSTREAMS_READ_HPP_INCLUDED